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611

Appendix1

GLOSSARY OF TERMS

AND ACRONYMS

The following is a glossary of some of the terms and abbreviations used in this book

and acronyms that provide description of significant terms frequently used or referred

to in the hydrocarbon liquids and oil industry including specifications, shipping, pipe-

line transportation and processing, CAPP 2011:

Absolute humidity The measure of the amount of water vapor actually in the

air. Often stated as pounds of water vapor per kg of dry

air. At any given temperature, relative humidity equals100 times the absolute humidity divided by the greatest

amount of water vapor that can be present in the air at that

temperature.

Absolute pressure Gauge pressure plus barometric pressure.

AGA American Gas Association.

AGO Atmospheric gas oil.

Alarm A warning given by a control system of a limit violation,

abnormal change of state, or a failure.

Alkylate A gasoline blending component composed of isobutane

and propylene or butylene.

Ammonia Organic amines and inorganic compounds that are liquids

at standard temperature and pressure that, when discharged,

release free amonia (NH3), or ammonium ion (NH4+).

Aniline point Reports the aromatics content of a mixture.

ANS Alaska North Slope.

American National

Standards Institute

(ANSI) A standards setting organization concerned with transmission.

API American Petroleum Institute.

API gravity Specific gravity scale for petroleum liquids at 60 F devel-

oped by API with reference to the specific gravity of waterbeing equivalent to 10 API. The relationship between the

API gravity and specific gravity is given below:

API gravity = (141.5/SG at 60 F) 131.5.

Aromatics Group of petrochemicals characterized by a ring structure,

they are produced in refinery reformers and petrochemical

plants. The most commonly traded are benzene, toluene,

and xylenes. They are used for chemical production or as

high-octane components for gasoline blending.

ASPH Asphaltene

Asphalt A mixture of bitumen and mineral aggregate as prepared

for the construction of roads or in other paving uses. In the

US it refers to the product.

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612 Hydrocarbon Liquid Transmission Pipeline and Storage Systems

AST Aboveground storage tank(s).

ASTM American Society for Testing and Materials.

Audit trail Log that documents changes that were made or the occur-

rence of an event in computer records or databases. The log

should include the change, the date and time, the person

that made each change, and the reason of the change.Avails Availabilities.

Avgas High octane aviation gasoline used in piston type aircraft

engines.

Backfilling Backfilling is the process of filling the trench where a newly

constructed or recently unearthed pipeline is installed. Ad-

equate fill material is provided and compacted around the

pipe to completely fill the excavation and to ensure that

the pipe is properly supported and not subjected to added

stresses due to soil subsidence or movement.

Backwardation Market situation where prices are highest in the nearestdate periods and are lower in forward delivery dates.

Barge A vessel carrying oil usually on rivers - containing between

8000 and 50,000 bbl (weighing 1,000 to 10,000 mt).

Barrel A volumetric unit of measure for crude oil and petroleum

products. 1 barrel equals 42 US gallons, 35 imperial gal-

lons or 159 liters.

Base assessment

plan

A baseline assessment plan (BAP) is the plan a pipeline

operator must develop to assess the integrity of all of the

lines included in its integrity management program. The

BAP must, as a minimum: 1) identify all segments of a

pipeline system that could impact a High Consequence

Area (HCA); 2) identify the specific integrity assessment

method(s) to be conducted on those segments; 3) specify

the schedule by which those integrity assessments will be

performed; and 4) provide the technical justification for the

selection of the integrity assessment method(s) and the risk

basis for establishing the assessment schedule. (reference49CFR 195.452 [3]).

Base conditions Pressure and temperature reference conditions used in de-

termining a fluid quantity for custody transfer.

Batch A batch refers to a contiguous product entity that remains

whole throughout its journey through the pipeline system.

A batch has the attributes of product type, volume, identifi-

cation or name, and lifting and delivery locations and times

with flow path.

Batching cycle Batching cycle is a specific period during which a prede-

fined set of products is transported. Multiple cycles are re-peated during the nomination period, usually a month.

Batch interface Interface volume of two adjacent batches. Refer to transmix

Batching meter A flow meter normally used for batch movement.


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Appendix 613

Battery Small field plants which remove natural gas, NGLs, wa-

ter, and sand from crude oil delivered by gathering systems

from individual wells.

Bell Hole A bell hole is an excavation made to permit a survey, inspec-

tion, maintenance, repair, or replacement of pipe sections. It

is so called because of its upside-down bell shape, wide at thetop and narrowing to a smaller diameter around the pipeline

to be examined. The walls of the hole are angled according

to OSHA (Occupational Safety and Health Administration)

rules to prevent cave-ins and risks to worker safety.

Bend Radius Bend radius is the measurement of the radius of a bend in a

pipeline. Bends can be included in the manufacture of the

pipe or created in the field during construction and instal-

lation of a pipeline.

Bias error The difference between the average and true values or

measurements. It is directional, but it is difficult to deter-mine a true bias error in practice.

Bill of Lading Documentation associated with a specific cargo of oil and is

signed by the captain of the ship and the contract supplier.

Bitumen A thick, sticky form of crude that is generallyheated or di-

luted to transport through a pipeline. Petroleum that exists

in the semi-solid or solid phase in natural deposits.

Bleeder A valve or pipe through which bleeding is done.

Blending Mixing of two or more products by injecting one product

stream into another.

Blendstock A component combined with other materials to produce a

finished refined product.Block valves Gate valves found in the pipeline on either side of a pump-

ing station or terminal, river crossing, or other points where

the line may have to be blocked. Block fluid flow in both

directions when closed. Block valves are installed along

the pipeline, called isolation or sectionalizing valve, and in

a pump station (suction valve and discharge valve).

Blow-down valve Valve used to exhaust gas from a section of pipe when ne-

cessitated by repairs, emergency, or other conditions.

Breakout point An intermediate location or tank farm on a pipeline system

that joins two or more pipeline sections, where batches canbe simultaneously injected into and delivered out of the

pipeline or a batch can be tight-lined.

Breakout tank A tank used to relieve surges in a liquid pipeline system, or

to receive and store liquid for re-injection and continued

transportation by pipeline.

BS&W Bottom sediment and water (expressed as a %by weight).

BTU British Thermal Unit.

BTX Benzene, toluene and xylene.

BTX extraction The process for removing benzene, toluene, and xylene

from reformate or pyrolysis asoline.

Bubble point The temperature at a given pressure, as opposed to vaporpressure, at which vapor starts forming above a liquid.

Buckle A buckle is a partial collapse of the pipe wall due to ex-

cessive bending associated with soil instability, landslides,


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washouts, frost heaves, earthquakes, etc. Buckles can also

occur in pipeline construction during a field bending opera-

tion using a side boom. Buckles cause localized stress con-

centrations and must not be installed in new construction

or, if found, must be removed from existing systems.

Buffer A temporary product injected between two batches to re-duce mixing of the two batches.

Bulkhead A bulkhead is a wall built or installed along a coastline or

waterway to protect an adjacent pipeline from washout or

soil erosion.

Bunker C A residual fuel used as ships fuel (usually has a high sulfur

content and is highly viscous).

Bypass valve Valve allowing flow around a metering system or

equipment.

Calibration Adjustment of a measuring instrument against a known

quantity to improve its performance or to conform to anapplicable standard.

Caliper tool A caliper tool is an inline inspection device that measures

deviations in the geometry of a pipelines internal surface.

A caliper tool uses a set of mechanical fingers that ride

against the inside diameter of the pipe and record devia-

tions caused by the relative movement of these fingers as

the tool passes through the pipe.

Capacity The volume of fluid that a pipeline system can transport for

given design condition.

CAPP Canadian Association of Petroleum Producers [1].

Carbon dioxide(CO2)

Carbon dioxide is a naturally occurring gas consisting ofmolecules formed of one carbon and two oxygen atoms.

Carbon dioxide is a heavy gas that is transported by pipe-

line as a compressed fluid consisting of more than 90%

carbon dioxide molecules. If released into the atmosphere

from a pipeline leak carbon dioxide is considered hazard-

ous due to its ability to displace breathing air (reference

49CFR 195.2 [3]).

Carbon steel All steel is formed by alloying iron with carbon. Steel is

commonly considered to be carbon steel when:

(1) no minimum content is specified or required for alumi-num, boron, chromium, cobalt, columbium, molybde-

num, nickel, titanium, tungsten, vanadium, zirconium,

or any other element added to obtain a desired alloying

effect;

(2) the specified minimum content does not exceed 1.65%

for manganese or 0.60% for copper. All carbon steels

may contain small quantities of unspecified residual

elements unavoidably retained from raw materials.

These elements (copper, nickel, molybdenum, chro-

mium, etc.) are considered incidental and are not nor-

mally determined or reported.Cast iron Cast iron applies to gray cast iron, which is a cast ferrous

material in which a major part of the carbon content occurs

as free carbon in the form of flakes interspersed through

the metal. Because the carbon flakes do not bond with the


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Appendix 615

ferrous material on the molecular level, the metal is brit-

tle and susceptible to stress cracking under high-pressure

situations. Many older, low-pressure gas systems were con-

structed with cast iron pipe.

Catfeed Feedstock to a catalytic cracker, usually vacuum gasoil.

Cat gasoline(cat naphtha) A gasoline blending component made in a cat cracker.

Cathode A cathode is a component of an electrochemical corrosion

cell. It is the metal that attracts ions and gains mass through

the corrosion process. In a cathodic protection system, the

pipeline acts as the cathode and is protected from corrosion

by the sacrificial activity of the anode.

Cathodic protection A method of preventing corrosion of a metal surface by

making that surface the cathode of an electrochemical cell

through the use of devices such as galvanic anodes or im-

pressed current.Cathodic protection

monitoring or

survey

Monitoring cathodic protection systems is an activity per-

formed by pipeline operators to assess the adequacy of ca-

thodic protection on the pipeline.

Cathodic

Protection Tester

A person who can demonstrate an understanding of the prin-

ciples and measurements of all common types of cathodic

protection systems as applied to buried or submerged metal

piping and tank systems.

Cavitation Bubbles form when the pump pressure, most likely suction

pressure, is equal to or below the liquid vapor pressure at

flowing temperature.

Centering The process of approximating the location of a pipelineleak. Centering can be done manually using gas detec-

tion equipment, such as acoustical equipment, or through

a more sophisticated SCADA-based leak detection system

using mathematical modeling of critical pressures, temper-

atures, flow-rates, etc. to predict volume loss and location

estimates.

Centrifugal pump A pump consisting of one or more impellers fixed on a ro-

tating shaft. The liquid enters the impeller at the shaft and

is impelled outward from the center by centrifugal force at

high velocity into the volute of the pump casing. This pumphas the advantage of constant pressure.

CEPA The Canadian Energy Pipeline Association.

Cetane A paraffinic hydrocarbon used as an additive in diesel

fuel.

Cetane number Percentage by volume of cetane added to basic diesel fuel

to achieve specific ignition performance characteristics.

Check valve A valve used to prevent the back flow. It remains open by

flowing fluid but closed automatically when fluid flow is

reversed or even stops.

Class location Class location is a criterion for gas pipeline design set by

the U.S. Code of Federal Regulations, 49CFR 192.5. Aclass location is based on the number and type of buildings

intended for human occupancy that are situated in an area

that extends 220 yd (200 m) on either side of the centerline


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of any continuous 1.0-mile (1.6-km) length of a gas pipe-

line. Class locations are specified as Class 1, 2, 3, or 4.

Class 1 indicates the least heavily populated of the class

locations, representing an offshore area or an area with 10

or fewer buildings intended for human occupancy. In com-

parison, Class 4 indicates the most heavily populated of theclass locations, representing an area where buildings with

four or more stories above ground are prevalent.

Chlorine Organic and inorganic compounds that are liquids at stand-

ard temperature and pressure that, when discharged, may

release free chlorine (Cl2) or chlorides (Cl).

CIF Cost, insurance, and freight charges for shipping products.

CIF prices include these charges.

Cleaning Pig A cleaning pig is a device that is placed inside a pipeline

to remove unwanted debris from the inside of the pipeline.

The pig can be drawn or pushed through a pipeline but of-ten is moved through the line as a result of the flow of the

product in the line. A type of utility pig, a cleaning pig uses

cups, scrapers, or brushes to remove dirt, rust, mill scale,

and other debris from the internal surface of a pipeline.

Cleaning pigs are used periodically or as necessary to in-

crease the operating efficiency of a pipeline or to facilitate

inspection of the pipeline.

Cloud Point The temperature at which a fuel, when cooled, begins to

congeal and take on a cloudy appearance due to bonding

of paraffins.

Codes Documents that regulate design and construction to protectthe safety of people. Codes establish minimum standards

but do not guarantee efficiency or quality.

Coker The processing unit in which bitumen is cracked into lighter

fractions and withdrawn to start the conversion of bitumen

into upgraded crude oil.

Common carrier Pipeline that provides transportation service to all parties

equally. It also applies to any transportation system avail-

able for use by the public for transporting cargo.

Common Ground

Alliance

The Common Ground Alliance (CGA) is a nonprofit or-

ganization dedicated to shared responsibility in damageprevention and promotion of the damage prevention Best

Practices identified in the Common Ground Study Report.

The purpose of the CGA is to ensure public safety, environ-

mental protection, and the integrity of services by promot-

ing effective damage prevention practices. The CGA can be

reached at 703-818-3217 or for more information see www.

commongroundalliance.com.

Compatible

substance

The ability of two or more substances to maintain their

respective physical and chemical properties upon contact

with one another for the design life of the storage tank sys-

tem under conditions likely to be encountered in the stor-age tank system.

Component A component in a pipeline system is any part of the sys-

tem that is subject to the internal system pressure. System

components must be designed to not leak; thereby assuring


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Appendix 617

that the oil or gas is not released from the system and that

the system operating pressure is maintained. Examples of

components include the pipe, valves, flanges, and other

fittings.

Computational

PipelineMonitoring (CPM)

Computational Pipeline Monitoring is a method of monitor-

ing the operation of a pipeline system, as specified in API1130. It makes use of a software-based monitoring tool that

alerts the pipeline dispatcher of possible pipeline operating

abnormalities that could indicate a commodity release.

Condensate The natural gas product, mostly pentanes and heavier, is

separated and recovered as liquids at field facilities or gas

processing plants.

Confirmation digs Confirmation digs are excavations performed at selected

pipeline locations to expose the pipe to allow confirmation

of the existence and characteristics of potential anomalies

in the pipe wall that were identified by inline inspectiontechniques.

Consensus

standards

Consensus standards are standards for performance that

are established in open and voluntary forums by consen-

sus of parties affected by the standards. These standards

provide the best available professional guidance related to

specific subjects. National consensus standards reflect the

professional knowledge and judgment of people having

appropriate experience, training, and education in the sub-

jects to which the standards apply. Some organizations that

produce consensus standards include: American Petroleum

Institute (API), American National Standards Institute(ANSI), ASTM International (ASTM), American Society

of Mechanical Engineers (ASME).

Consent order Once PHMSA has issued a Corrective Action Order or

given notice to an operator of other proposed enforcement

action, PHMSA and the operator may occasionally agree to

the issuance of a Consent Order in lieu of a Compliance Or-

der or the imposition of civil penalties. In a Consent Order,

the operator agrees to the jurisdictional facts of the case

and agrees to implement the specific actions in the Consent

Order by the required deadlines. Should the operator notcomply with the Consent Order terms, PHMSA can enforce

its terms as the parties have agreed. Consent Orders are

described in 49 CFR 190.219.

Consequence A consequence is often noted as the cumulative, undesirable

result of an accident. Consequences are usually measured

in health and safety effects, environmental impacts, loss of

property, and/or business costs. Consequence descriptions

may be qualitative or quantitative estimates of the effects

of an accident.

Consequence

analysis

A consequence analysis is the evaluation or analyses of a

postulated action or condition or series of events to deter-mine the logical result. A consequence analysis may be per-

formed to determine the expected effects of events leading

to a pipeline accident, independent of the likelihood of such

events occurring.


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Contamination or

contaminated

The presence of substances in surface water, groundwater,

soil, sediment, or on the land, in quantities that result in

exceedances of applicable cleanup target or usage levels.

Continual

evaluation of

pipeline integrity

Under pipeline integrity management regulations, pipeline

operators must develop programs for conducting periodic

pipeline integrity assessments and evaluating the results ofthose assessments to understand current pipeline conditions

and identify integrity issues. This periodic assessment and

evaluation cycle is recognized as a continual evaluation of

pipeline integrity.

Contract An agreement between the pipeline company and a ship-

per which specifies the type of service and minimum/maxi-

mum volumes.

Corrosion Corrosion is the deterioration of a material, usually a metal,

which results from a reaction with its environment. Com-

mon rust is an example of corrosion of iron. Steel pipe issubject to corrosion damage.

Corrosion

professional

A person who, by reason of knowledge of the physical sci-

ences and the principles of engineering and mathematics

acquired by a professional education and related practical

experience, is qualified to engage in the practice of corro-

sion control on buried or submerged metal components of

a storage tank system.

Cost/benefit

analysis

A cost benefit analysis is a determination and comparison

of the expected costs to implement a proposed activity and

the expected safety, environmental, or other benefits result-

ing from the activity. Cost/benefit analysis can be used toestablish priorities among various activities, to compare

and select among alternate ways of accomplishing an ob-

jective, or to decide whether a proposed activity should be

implemented. Cost/benefit analysis is used by regulators to

justify new regulations, and by operators to define and al-

locate resources to operational and maintenance activities.

Cost/Benefit ratio The monetary costs required to complete a proposed activ-

ity (for example, replacing a section of pipe) divided by

the monetized value of the benefits expected to be derived

from that activity (for example, decreased pipe leak rate orlikelihood of rupture). Cost/benefit ratios are usually used

as an input to, but not sole determinate of, a decision to

proceed with the proposed activity.

Cracked Molecules broken by some refining processes. the opposite

of straight-run.

Cracked fuel Residue remaining after processing a straight run fuel by

enhanced refining methods such as catalytic cracking

Cracks Cracks in line pipe are separations in the molecular struc-

ture of the base metal and form as a result of improper man-

ufacturing or operational stresses. Cracks are detrimental to

the pipes pressure restraining capabilities and can propa-gate into complete failure or rupture zones.

Critical bond Buried pipelines in close proximity or crossing over/under

one another will often have different levels of cathodic pro-

tection and thus a strong possibility of different electrical


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Appendix 619

potentials (voltage differences). If the soil resistance path

between the pipelines is low, electrical currents will flow

from one pipeline to the other. The pipeline with the cur-

rent leaving will experience metal loss or corrosion. To

prevent this occurrence, pipeline companies electrically

connect or bond their pipes to one another using a copperwire. The wire provides an electrical path for the current

to flow through rather than allowing current to flow off the

pipe and into the soil, thus eliminating corrosion. The con-

necting wire is referred to as an electrical bond. Critical

bonds are those that if not attached, would allow corrosion

to occur and jeopardize the safe operation of one of the

pipelines in question.

Critical defect A critical defect is an identified pipeline defect for which

analysis indicates immediate attention is required.

Critical point The meeting point of critical pressure and critical tempera-ture at which the properties of the liquid and gas phases

become identical.

Crude oil A naturally occurring liquid mixture of hydrocarbons; liq-

uid petroleum.

Crude oil

(Conventional) A mixture of pentanes and heavier hydrocarbons that is re-

covered or is recoverable at a well from an underground

reservoir. It is liquid at the conditions under which its vol-

umes is measured or estimated and includes all other hy-

drocarbon mixtures so recovered or recoverable except raw

gas, condensate, or bitumen.Crude oil (heavy) Crude oil that has an API of 27 or less. No differentiation

is made between sweet and sour crude oil that falls in the

heavy category because heavy crude oil is generally sour.

Crude oil (medium) Crude oil is has an API greater than 27 but less than 30.

Generally, no differentiation is made between sweet and

sour crude oil that falls in the medium category because

medium crude oil is generally sour.

Crude oil

(synthetic)

A mixture of hydrocarbons, similar to crude oil, derived by

upgrading bitumen from the oil sands.

CST Centistokes a measure of viscosity similar to seconds.Custody transfer Custody transfer is the change of ownership of petroleum

products at a given transfer point, most likely at a meter

station.

Customer Entity such as a local distribution company or marketer that

generates a net outflow of gas or liquid from the pipeline

company.

Cut and cover tank A tank that is constructed with steel that is surrounded by

soil above the natural surface of the ground.

DCS Distributed Control System. This is a type of automated

control system that is used to monitor and control a process

facility.Damage prevention

initiatives

The Office of Pipeline Safety has undertaken a variety of

other initiatives to promote pipeline damage prevention.

These initiatives, some of which involve collaboration

with various stakeholder industry groups, promote public


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awareness of pipelines and other underground facilities;

education of the public and emergency officials, excava-

tors, emergency responders, legislators and other stake-

holders on how to recognize and respond to pipeline leaks;

and other aspects of pipeline safety. Some more notable

recent efforts include: Common Ground Alliance (CGA)and the One-Call Systems Study (OCSS).

Damage prevention

regulations

Damage prevention regulations for pipelines are found in

the Code of Federal Regulations. They require pipeline

operators to implement programs to prevent damage to

buried pipelines from excavation activities. The regula-

tions specify requirements for operators to interact with the

public near pipelines and with companies/persons likely to

perform excavation near pipelines. Pipeline operators may

comply with some of the regulatory requirements for dam-

age prevention by participating in public service programssuch as a one-call system. However, such participation does

not relieve the operator of the responsibility of compliance

to the regulation.

Degrees API

Gravity

= (141.5/Specific Gravity at 60 F) 131.5

Defect A defect is an imperfection of sufficient magnitude in a

pipeline that it should be analyzed using a recognized and

approved engineering procedure, such as ASME B31G.

Analysis determines if the defect is severe enough to re-

quire removal or repair, depending on prescribed operating

requirements. Examples of defects include dents, corrosionpits, and cracks.

Delivery The transfer of a quantity of fluid out of a pipeline system,

typically into a tank, either at the end or at an intermediate

location. This is the point of custody transfer for fluid mov-

ing out of the pipeline companys system.

Delivery station Also known as terminal, this is where the product delivery

takes place. It is equipped with tanks and distribution facili-

ties. It is a place where one product is transferred from one

party to another.

Demurrage The detention of a vessel in loading or unloading beyondthe time agreed upon.

Dense phase A dense phase is defined as the phase whose pressure ex-

ceeds the pressure of the critical point of the fluid. The

dense phase fluid exhibits high density and high compress-

ibility (low viscosity).

Density Mass or weight per unit volume.

Dent A dent is a depression in the pipeline surface caused by

pressure or a blow. A dent does not reduce the thickness of

the pipe wall. Dents are usually local depressions caused

by outside mechanical force, such as the pipe resting on

a rock or being hit by a backhoe. Pipeline repairs or re-placement may be needed depending on the severity of the

deformation.

Derating Process of reducing the level less than its design capacity.


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Appendix 621

Design factor Ratio of the hoop stress developed in the pipeline by the

design pressure and the Specified Minimum Yield Stress

(SMYS) of the pipeline material.

Destructive testing Destructive testing refers to testing of a specimen in which

the specimen is rendered unusable (i.e., destroyed) for

its intended or practical use. Destructive tests are typi-cally conducted on representative specimens to prove the

strength or chemical characteristics of the sample piece.

Dew point The temperature at a given pressure or the pressure at a

given temperature, at which liquid starts condensing from

a vapor.

Diesel Index A measure of the ignition quality of a diesel fuel calculated

from a formula involving the gravity of the fuel and its ani-

line point.

Dike field area The area around the tank or tanks that extends from the

circumference of the base of an AST to the top of the berm,dike, or retaining wall surrounding the tank.

DilBit Bitumen that has been reduced in viscosity through addition

of a diluent (or solvent) such as condensate or naphtha.

Diluent Lighter viscosity petroleum products that are used to dilute

bitumen for transportation in pipelines.

Direct assessment Direct assessment refers to a method of evaluating the in-

tegrity of a pipeline. Various indirect measurement tools

are used to determine locations on the pipeline that may re-

quire direct examination to verify pipeline integrity. These

locations are then excavated and examined to verify that

the pipe is in good condition or to make necessary repairs.Disbonded coating Disbonded coating refers to any loss of bond or adhesion

between the protective coating applied to the outside of a

steel pipe and the pipe itself. Disbondment can result from

adhesive failure, chemical attack, mechanical damage, hy-

drogen concentrations, or other causes.

Discharge Any spilling, leaking, seeping, pouring, misapplying, emit-

ting, emptying, or dumping of any substance which oc-

curs and which affects lands and the surface and ground

waters.

Discharge pressure The pressure of the pipeline as the fluid exits a pumpstation.

Distribution line A distribution line is a line used to supply natural gas to

the consumer. A distribution line is located in a network of

piping located downstream of a natural gas transmission

line. As defined in natural gas pipeline safety regulations,

a distribution line is a pipeline other than a gathering or

transmission line.

DOT U.S. Department of Transportation.[2].

Double-bottomed An AST that has secondary containment in the form of an

outertank bottom having a closed interstitial space be-

tween the primary tank bottom and the secondary outertank bottom.

Double-walled A storage tank that has an outer tank wall, or integral piping

that has an outer wall that provides secondary containment

of the primary tank or piping.


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DRA Drag reducing agent, a long chain polymer. This is a fluid

injected into a pipeline to reduce friction along the pipeline

and thus increase the throughput.

Durability Durability is the ability of a material to resist fatigue, which

is a weakening of the material resulting from the repeated

application and removal of stress. Pipelines experience fa-tigue as a result of periodic increases (application of stress)

and decreases (removal of stress) in operating pressures.

Durability refers to the pipes ability to resist fatigue and

continue to perform its required function.

Easement A right-of-way agreement between a pipeline company and

the property owner.

E-4 C.I.S. (Chemical Information system) high sulfur straight-

run feedstock. Formerly called F-10.

Electric resistance

weld pipe

Electric resistance welding (ERW) is a method used for

making pipe in which the two edges of a curved plate ofmetal are heated by passing an electric current through

them and the edges are then forced together to create a solid

longitudinal weld, thus turning the plate into a section of

pipe.

Emergency flow

restricting device

An emergency flow restricting device (EFRD) is a device

used to restrict or limit the amount of oil or gas that can

release out of a leak or break in a pipeline. Check valves

and remote control valves are types of EFRDs.

Empty All substances have been removed so that no more than

1 in. in depth or 0.3% by weight of total system remains in

the storage tank system.Encroachment Encroachment refers to the unauthorized use of a right-of-

way in violation of the terms by which the right-of-way

was established (e.g., easement).

Environmental

impact statement

An environmental impact statement is preceded and de-

termined by an environmental assessment. An EIS must

include a description of: (1) the environmental impact of

the proposed action, (2) any adverse environmental ef-

fects which cannot be avoided should the proposal be im-

plemented, (3) alternatives to the proposed action, (4) the

relationship between local, short-term uses of the environ-ment and the maintenance and enhancement of long-term

productivity, and (5) any irreversible and irretrievable com-

mitments of resources which would be involved in the pro-

posed action should it be implemented.

EPA US Environmental Protection Agency

Environmentally

sensitive area

An environmentally sensitive area (ESA) is an area of envi-

ronmental importance that is sensitive to environmental dam-

age from a liquid pipeline release. (Reference 49CFR 195.2).

ESD Emergency Shutdown Detection. This is a controller that

is independent of the station control system that detects

conditions requiring an immediate shut down of the pump/compressor station.

ETA Estimated time of arrival. This is the ETA of a tracked ob-

ject such as a batch front or scraper at a specified location

or facility.


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Appendix 623

Excavation Excavation refers to any operation involving movement of

earth, rock or other materials below existing grade or sur-

face level. Excavation can include digging, blasting, bor-

ing, tunneling, and backfilling.

External floating

roof

A storage vessel cover in an open top tank consisting of a

double deck or pontoon single deck which rests upon andis supported by the petroleum liquid being contained and

is equipped with a closure seal or seals to close the space

between the roof edge and tank shell.

Extraction A process generally unique to the oil sands industry, in

which bitumen is separated from their source (oil sands).

Eye (of an impeller) Internal pressure point at the inlet of the first impeller of

the compressor. A suction-to-eye differential pressure is

typically representative of flow.

Failure While a pipeline that is actually leaking product is the most

obvious indication of failure, failure is often also defined asthe point at which the pipe material is stressed beyond its

elastic or yield point. At that point, the material is deformed

and does not return to its original shape. A pipeline rupture

is an example of this type of failure.

Failure frequency The number of failure events that occur divided by the total

elapsed calendar time during which those events occur or

by the total number of demands, as applicable.

Failure probability Failure probability is the probability that a structure, device,

equipment, system, etc. will fail on demand or will fail in a

given time interval, expressed as a value from 0 to 1.

Failure rate Failure rate is the number of failure events that occur di-vided by the total elapsed operating time during which

those events occur or by the total number of demands, as

applicable.

Fatigue Pipelines experience fatigue as a result of periodic in-

creases (application of stress) and decreases (removal of

stress) in operating pressures. Because fatigue can cause

a failure to occur at stress levels well below those that a

material can withstand in a single, non-repetitive loading,

materials that must resist repeated stress cycles must be

specially designed for this service. Durability is the abilityof the material to resist fatigue.

Feedstock Material used in or supplied to a processing plant, refinery

or oil sands upgrader.

Field-erected

storage tank

An AST that is constructed by assembling it on-site at the

facility.

FERC The Federal Energy Regulatory Commission is an independ-

ent regulatory agency within the Department of Energy that

regulates the transmission and sale for resale of natural gas

in interstate commerce; regulates the transmission of oil by

pipeline in interstate commerce; regulates the transmission

and wholesale sales of electricity in interstate commerce;licenses and inspects private, municipal, and state hydro-

electric projects; oversees related environmental matters;

administers accounting and financial reporting regulations

and conducts of jurisdictional companies; and approves


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sitting and abandonment of interstate pipeline facilities. FERC

can be contacted at 866-208-FERC or at www.ferc.gov.

Fittings The small pipes and valves that are used to make up a

system of piping. This may include fabricated assemblies

(such as valves, pumps, and pipe fittings).

Flammable fluid A fluid having a flash point lower than 100C.Flange A projecting rim, edge, lip, or rib to provide strength for

guiding or for attachment to another object, as a plate to

close a pipe opening or other orifice.

Flash point The lowest temperature under very specific conditions at

which a combustible liquid will give off sufficient vapor to

form a flammable mixture with air in a standardized vessel.

Assesses the volatility of the product.

Flow computer

(FC)

Field device for collecting measurement data in real time,

performing certain calculations such as AGA, storing his-

torical measurement and calculation data, and uploadingto/downloading from the host SCADA.

Flow line A pipeline (including valves and fittings) for transporting

untreated hydrocarbons and other reservoir.

Flow profile An expected yearly flow pattern for the liquid supply or

demand over the project period that would be required to

design the pipeline system.

Flow-through

process tank

A tank that forms an integral part of a production process

through which there is a steady, variable, recurring, or inter-

mittent flow of materials during the operation of the process.

Flow-through process tanks include tanks associated with

vapor recovery units and oil-water separators. Flow-throughprocess tanks do not include the storage of finished products

or by-products from the production process.

FOB Free on board. FOB prices exclude all, insurance and

freight charge.

Fracture toughness Fracture toughness is the ability of a material to deform

under increasing tensile stress in the presence of a defect

or crack without exhibiting rapid and extensive fracture

propagation. Materials that have high fracture toughness

can absorb larger amounts of energy (i.e., can withstand

higher pressures or levels of stress) before an existing crackspreads.

Full or tight line

flow

Flow that completely fills a pipeline, opposite to slack

flow.

Fungible batch A batch that can be combined with other batches of the

same product.

Gathering Lines The piping networks installed in oil fields to transport pe-

troleum to a processing plant or bulk shipping point.

Gathering system A system of pipelines laid to bring gas or oil from wells to

a central point.

Gasoil An intermediate distillate product used for diesel fuel (in-

terchangeably with No. 2 heating oil).GIS Geographic Information Systems, a computerized informa-

tion system for storing, manipulating and analyzing spa-

tially referenced information.


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Appendix 625

Geometry tools Geometry tools are inline inspection tools that are used to

identify changes in the internal shape/diameter of a pipe-

line. Changes in the internal shape or diameter of pipe

can be caused by dents, wrinkles, ovality, bend radius and

angle, and occasionally indications of significant internal

corrosion.Gross volume Raw volume of fluid at the measured conditions of pressure

and temperature before it is corrected and before water and

sediment (for liquid measurement) are accounted for.

Hazard and

Operability

Analysis

A hazard and operability analysis (HAZOP) is a systematic

method for evaluating hazards. It often involves the review

of detailed system drawings, specifications, and operating

procedures. Process hazards and potential operating prob-

lems are identified through a qualitative investigation of

deviations from normal process conditions.

Hazardous site A hazardous site is the location of a hazard. This includeslocations where hazardous materials are used, stored, trans-

ported or produced. It could also include a location where a

hazardous liquid has been accidentally released.

Hazardous

Substances Substances that are hazardous to human and environmental

well being.

HDA Hydrodealkylation, a process used for making benzene

from toluene.

Heating oil Any petroleum based fuel used in the operation of heating

equipment, boilers, or furnaces.

Heavy crude oil Has API gravity lower than 28. The lower the API gravity,the heavier the oil.

Heavy oil Oil having an API gravity less than 22.3. Includes some oil

that will flow, however slowly, but most heavy oil requires

heat or dilution to flow to a well or through a pipeline.

High consequence

area

A high consequence area (HCA) is a location that is spe-

cially defined in pipeline safety regulations as an area

where pipeline releases could have greater consequences

to health and safety or the environment. For oil pipelines,

HCAs include high population areas, other population

areas, commercially navigable waterways and areas un-usually sensitive to environmental damage. Regulations

require a pipeline operator to take specific steps to ensure

the integrity of a pipeline for which a release could affect

an HCA and, thereby, the protection of the HCA.

High viscosity A pollutant with a viscosity of 30 centistokes (cSt) and

higher at 40 C, such as American Society for Testing and

Materials (ASTM) grades 5 and 6 residual oils, intermedi-

ate fuel oils, or Bunker C fuel.

HMI Human Machine Interface. This refers to the interface be-

tween a user and a SCADA or computer system.

Host The centrally located collection of hardware and softwareof a SCADA system.

HSFO High sulfur fuel oil.


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Highly volatile

liquid

A highly volatile liquid (HVL), as defined in pipeline safety

regulations, is a hazardous liquid that will form a vapor

cloud when released to the atmosphere and has a vapor

pressure exceeding 276 kPa (40 psia) at 37.8 C (100 F).

HVP products The acronym for high vapor pressure products. These are

light hydrocarbons whose vapor pressure exceeds 110 kPaat 38 C.

Hoop stress Hoop stress is stress that acts around the circumference of

a pipe (i.e., perpendicular to the pipe length) and is caused

by the internal pressure pushing outward against the pipe

wall. As pressure within the pipe increases, the stress in the

pipe wall must be capable of acting against that pressure to

contain it. Hoop stress is a critical factor in determining a

pipes pressure holding capacity and thus in determining its

appropriate application.

Hydrocarbons A large class of liquid, solid, or gaseous organic com-pounds, consisting of only carbon and hydrogen, which are

the basis of almost all petroleum products.

Hydrogen induced

damange

Examples of hydrogen induced damage are: (1) formation

of internal cracks, blisters, or voids in steels; (2) embrit-

tlement (i.e., loss of ductility); and (3) high temperature

hydrogen attack (i.e., surface decarbonation and chemical

reaction with hydrogen).

Hydrant piping The pressurized integral piping system, including hydrant

pits, associated with petroleum storage tank systems.

Hydrocarbon

bubble point

The pressure and temperature point of a hydrocarbon liq-

uid, at which vaporization is about to occur.Hydrostatic

pressure testing

Hydrostatic pressure testing (or hydro testing) is a method

of testing pipeline integrity in which the line is filled with

a liquid, usually water, and then the pressure of the liq-

uid is raised to a specified pressure that is maintained for

a specified period of time. Any ruptures or leaks revealed

during the test must be repaired and the test repeated until

no problems are noted.

Immediate repair

condition

An immediate repair condition is a defect or anomaly in the

condition of the pipe for which pipeline safety regulations

require immediate action to repair the anomaly (reference49CFR 195.452 [3]).

Impeller The rotating element of a centrifugal pump that imparts the

kinetic energy to the liquid.

In-service A storage tank system that is being actively maintained and

operated.

In-service pipeline An in-service pipeline is a pipeline that is being used to

transport natural gas or liquid.

Inactive pipeline An inactive pipeline is a pipeline that is not presently being

used to transport oil or natural gas but that is being main-

tained in accordance with regulatory requirements so that

it can be put back in to active use if needed.In Situ recovery The process of recovering crude bitumen from oil sands

by drilling.

Incident A condition or situation indicating that a discharge may

have occurred from a storage tank system.


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Appendix 627

Incident command

system

In widespread or major emergencies that could affect large

populations or have significant environmental impacts an

Incident Command System (ICS) is usually established to

coordinate the combined actions of various emergency re-

sponse personnel.

Incipient leak A leak that is just about to occur.Increment

Strapping Table

A strapping table of level increments vs. tank volumes,

which is used to convert level increments into gross

volumes.

Industrial

occupancy building

An enclosed structure that contains an AST system that

is used in association with an industrial or manufacturing

process, or for electric power generating utilities, provided

that the building was constructed and is used primarily for

industrial, manufacturing, or electric power generating pur-

poses, and not solely for the purpose of storing approved

petroleum products.Industry cost of

incident

The industry cost of an incident is defined as all costs to the

operator and its contractors.

Initial injection

station

Supply or inlet station, located at the beginning of the pipe-

line system, where the product is lifted into the pipeline.

Storage facilities, pumps and flow meters are installed at

the station.

Injection The process whereby a fluid is moved from a tank into a

pipeline at the head or intermediate location within the

pipeline companys system.

Inline inspection

(ILI)

Inline inspection is a method of inspecting a pipeline using

an inline inspection tool or smart pig. ILI is also known asInternal Inspection or Smart Pigging. Different ILI tech-

niques and tools are designed to detect defects in the pipe

wall and on the internal and external surfaces of the pipe.

Defects can include areas of corrosion, dents, metal loss,

and the presence of cracks.

ILI tool An inline inspection tool is a device used to perform inline

inspection. An ILI tool is inserted into a pipeline and, usu-

ally, is pushed through the line by the pressure of the fluid

being transported. As the ILI tool travels through the pipeline

it uses nondestructive testing techniques and technology toidentify and record potential pipe defects or abnormalities.

An ILI tool is also known as an Intelligent or Smart Pig.

Integral piping On-site piping, originating, or terminating at storage tank

or tanks, that conveys petroleum products. Vapor recovery

lines, pipeline facilities, and vent lines are not considered

integral piping. Integral piping is not considered on-site if

the piping crosses two boundaries. Integral piping includes

all valves, elbows, joints, flanges, pumps, and flexible con-

nectors, up to the forwarding pump.

Integration of data As used in pipeline integrity management regulations,

integration of data (or data integration) is the process ofbringing together all available risk and integrity-related

data and information. Data integration is necessary and

useful in evaluating the combined impact of diverse fac-

tors on pipeline risk.


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Integrity Integrity is being of sound and unimpaired condition. Pipe-

line integrity assures that the pipeline is in sound and unim-

paired condition and can safely carry out its function under

the conditions and parameters for which it was designed.

Integrity

assessment

An integrity assessment is an evaluation to determine pipe-

line integrity. Acceptable assessment methods for pipelinesinclude the use of internal inspection tools, hydrostatic

pressure testing, or other technology that the operator dem-

onstrates can provide an equivalent understanding of the

pipe condition (reference 49CFR 195.452 [3]).

Integrity

management

system

In accordance with pipeline safety regulations for oil pipelines,

an operators integrity management program must include, at

a minimum, the following elements: a process for determin-

ing which pipeline segments could affect a High Consequence

Area (HCA), a Baseline Assessment Plan, a process for con-

tinual integrity assessment and evaluation, an analytical proc-ess that integrates all available information about pipeline

integrity and the consequences of a failure, repair criteria to

address issues identified by the integrity assessment method

and data analysis (the rule provides minimum repair criteria

for certain, higher risk, features identified through internal

inspection), a process to identify and evaluate preventive and

mitigative measures to protect HCAs, methods to measure the

integrity management programs effectiveness, and a process

for review of integrity assessment results and data analysis by

a qualified individual (reference 49CFR 195.452 [3]).

Internal floatingroof

A cover or roof in a fixed roof tank which rests upon oris floated upon the petroleum liquid being contained, and

is equipped with a closure seal or seals to close the space

between the roof edge and tank shell.

Internal lining A material that is applied internally on AST bottoms to pro-

tect the tank from internal corrosion.

Interruptible

service

A service that can be interrupted if the pipeline capacity is

not sufficient to serve a higher priority transportation service.

Interruptible service is less expensive than firm service

Interstate pipeline An interstate pipeline is a pipeline or that part of a pipeline

that is used in transportation of hazardous liquids or naturalgas in interstate or foreign commerce.

IPE International Petroleum Exchange.

ISO International Standards Organization.

Isomerate A gasoline blendstock made in an isomerization unit.

ITT In-tank transfer.

Kero Kerosene.

Landed Cost (of oil) The cost of oil off-loaded at a port. Similar to CIF, but

would also include any duties fees or taxes.

Lateral A lateral is a segment of a pipeline that branches off of the

main or transmission line to transport the product to a ter-

mination point, such as a tank farm or a metering station.Launcher A launcher is a pipeline component that is used for insert-

ing an inline inspection tool, cleaning pig, or other device

into a pressurized pipeline. After performing its task, the

tool or pig is removed via receiver.


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Appendix 629

Leak A leak is a small opening, crack, or hole in a pipeline al-

lowing a release of oil or gas. Pipeline operators periodi-

cally perform leak surveys as leaks may not be readily or

immediately detected.

Leak survey A leak survey is a systematic inspection for the purpose of

finding leaks on a pipeline. The frequency and methods ofperforming leak surveys are regulated and may vary de-

pending on several factors.

Lifting Injection of a batch at the head of a pipeline system, also

tankers and barges loading petroleum at a terminal or trans-

fer point.

Light crude oil Crude oil with API gravity higher than 33.

Light products,

light ends

The group of petroleum products with lower boiling tem-

peratures including gasolines and distillate fuels.

Line fill The volume of petroleum products within a pipeline or a

pipeline segment during transportation.Line markers Line markers are signs or other markers installed above

the pipeline to indicate the approximate pipeline route and

provide emergency phone numbers. Requirements for line

markers are specified in federal pipeline safety regulations

(reference 49CFR 192.707 [4] or 49CFR 195.410) [3].

Line pack The volume of fluid in a pipeline segment or entire pipeline

system. Line pack can increase or decrease depending on

whether the fluid volumes received are larger than the vol-

umes delivered or vice versa.

Line packing/

unpacking

Increasing/decreasing process of line pack.

Line pressure Pressure generated by station pumps and transmitted to the

line for purpose of moving product.

Liner An impervious material that is used externally as a method

of secondary containment.

Line section A line section is a designated section of a continuous run of

pipeline. Line sections may designate sections that run, for

example, between adjacent compressor stations or pump

stations, between a compressor/pump station and a storage

facility, between a compressor/pump station and a block

valve, or between adjacent block valves. A line section canalso be designated for testing purposes. For example, a line

section may be a pipeline segment designated for hydro-

static testing that runs between two mainline valves.

Liquid-mounted

seal

A primary seal mounted so the bottom of the seal covers

the liquid surface between the tank shell and the floating

roof.

Liquid trap Sumps, well cellars, and other traps used in association with

oil and gas production, gathering and extraction operations.

LLS(USA) Light Louisiana Sweet.

LNG Liquefied natural gas.Supercooled natural gas that is main-

tained as a liquid at or below 160 C; LNG occupies1/600th of its original volume and is therefore easier to

transport if pipelines cannot be used.


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Load factor The ratio of average demand to maximum demand (peak

load) during a specific period such as yearly or seasonal

period.

Load sharing Sharing of load among pump units at a multiple unit station

to achieve increased efficiency.

L/P Low pour.LPG The acronym for liquefied petroleum gas, mostly being

composed of normal butane, iso-butane, and propane.

LS Low sulfur.

LSFO Low sulfur fuel oil.

LSWR Low sulfur waxy residual fuel oil.

Lt Sweet Synthetic Light sweet synthetic crude.

MAOP Maximum allowable operating pressure, at which a pipe-

line or a section of the pipeline is allowed to operate in

normal conditions.

Magnetic fluxleakage Magnetic flux leakage (MFL) refers to an inline inspectiontechnology in which a magnetic field is induced along a

pipe wall through the use of a smart pig. As the smart pig

travels through the pipeline, measurements are taken of the

magnetic flux density at the internal surface of the wall.

Changes in measured flux density indicate the presence of

potential defects. A number of different MFL tool designs

are used for pipeline inspection. These tools are often cat-

egorized as standard resolution or high resolution devices.

High resolution MFL tools contain a greater number of

sensors and thus provide more accurate measurements of

potential defects and anomalies.Mainline A mainline consists of one or more pipeline sections that di-

rectly connect an origin point to a final delivery or break

out point. All mainline sections are hydraulically coupled

to one another.

Mainline valves A mainline valve is a valve positioned at a location along

the pipeline system that can be closed down to isolate a line

section in an emergency. Mainline valves are especially im-

portant to minimize hazards and damage or pollution from

an accidental release of oil or natural gas. Mainline valves

may also be referred to as sectionalizing block valves fornatural gas pipelines. (Reference 49CFR 192.179 [4] and

49CFR 195.260 [3])

Maintenance Maintenance is the process of maintaining property or

equipment, including pipelines and tanks, to preserve it and

prevent it from failure and ensure that it will continue to

perform its intended function.

Manifold A collection of pipe in which tanks are connected to other

equipment or a flow meter is mounted.

Manometer A U-shaped tube containing a liquid (usually mercury or

water) to measure the fluid pressure. The liquid level on

one side of the tube changes with respect to the level on theother side with changes in pressure.


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Appendix 631

Mass flow meter Mass flow meter is a flow meter measuring the flow rate

directly in mass.

Master Another term used for a SCADA host.

Merchant upgrader Processing facilities designed to accept raw bitumen on a

contract basis from producers.

Metal loss Metal loss refers to any of a number of types of anomaliesin pipe in which metal has been removed from the pipe

surface, usually due to corrosion or gouging.

Meter factor Correction factor applied to a meters reading to obtain a

corrected reading, typically on a custody flow meter.

Meter run Flow measurement unit consisting of the primary and sec-

ondary metering elements in the metering manifold.

Meter prover A meter prover determines the meter factor of a turbine or

positive displacement meter, i.e., the relationship between

the number of counts or revolutions of the meter and the

volume flowing through the meter. The number of countson the meter being proved is related to the volume passing

the detectors on the prover.

Metering stations Measure the quantity of natural gas or liquids flowing

through a pipeline.

Metric Ton A standard measurement: averages 7.33 barrels of crude

oil.

Mid-continent

crude

Oil produced mainly in Kansas, Oklahoma, and North

Texas.

Midgrade unleaded Un-leaded gasoline with a 89 R+M/2 octane rating.

MMCF Million cubic feet. The cubic foot is a standard unit of

measure for quantities of gas at atmospheric pressure andtemperature.

Modem A device that converts computer generated data streams

into analog form so that they can be transmitted over a

transmission line.

Mobile tank An AST that is moved to a different location at least once

every 180 days.

MOGAS Abbreviation for motor gasoline.

MON Motor Octane Number.

MT Metric ton.

MTBE Methyl tertiary butyl ether an octane booster and oxy-genate used for gasoline blending.

Naphtha Straight-run gasoline fractions (for feedstock for reforming

and as a petrochemical feedstock).

N+A Naphthenes and aromatics.

Naphthenic A high naphthenes content.

Naphthenic

naphtha

Usually favored as reformer feedstock.

NACE The National Association of Corrosion Engineers (NACE)

is a membership association focused on the study of corro-

sion and development of corrosion prevention and control

standards. NACE International can be contacted at 281-228-6200 or for more information see www.nace.org.


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NPMS The National Pipeline Mapping System (NPMS) is a geo-

graphic information system (GIS) database that contains the

locations and selected attributes of natural gas transmission

lines, hazardous liquid trunklines, and liquefied natural gas

(LNG) facilities operating in onshore and offshore territo-

ries of the United States. The NPMS is managed, operated,and maintained by the Office of Pipeline Safety (OPS) and

is being developed under a joint government-industry effort

involving OPS, other federal and state agencies, and the

pipeline industry. OPS can be contacted at 202-366-6267 or

for more information see www.npms.phmsa.dot.gov.

NTSB The National Transportation Safety Board (NTSB) is an

independent US federal agency charged by Congress with

investigating significant accidents in all modes of transpor-

tation pipeline, aviation, railroad, highway, and marine.

NTSB issues safety recommendations aimed at preventingfuture accidents. NTSB can be contacted at 202-314-6000

or for more information see www.ntsb.gov.

Nationally

recognized

laboratory

An organization that can perform quantitative and qualita-

tive tests on storage tank system equipment, evaluate the

test data and equipment performance, and make determina-

tions of the equipments capability of meeting the technical

standards.

Natural gas Gaseous petroleum consisting of methane with some

amounts of ethane, propane, butane and pentane, and

heavier hydrocarbons. It can include carbon dioxide,

hydrogen sulfide, and water.Natural gas

transmission

pipeline

A natural gas transmission pipeline is a pipeline, other than

a gathering line, that 1) transports gas from a gathering line

or storage facility to a distribution center, storage facility,

or large-volume customer that is not downstream from a

distribution center; 2) operates at a hoop stress of 20% or

more of specified minimum yield strength (SMYS); or,

3) transports gas within a storage field.

Net volume Measured volume corrected to base pressure and tempera-

ture, used in accordance with an accepted standard such as

API 11.2.2, ASTM tables or ISO 9770.NFPA National Fire Protection Association.

NGL The acronym for natural gas liquid, being composed of

propane, butane, pentane, hexane, heptane, and possibly

trace amount of ethane. These components are produced

from natural gas stream and recovered in liquids from gas

processing plants.

NIST National Institute of Science and Technology, a U.S. gov-

ernment organization that develops standards and applies

technology and measurements.

Nomination Nomination is a request for transportation service includ-

ing the quantity of petroleum fluid that a shipper requests apipeline company to transport for the nomination period.

Nomination

allocation

A process by which capacity available in a pipeline is dis-

tributed to parties in the event that nominations are in ex-

cess of the available supply or pipeline capacity. Typically,


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Appendix 633

the allocation is based on service type, contract type, and a

companys tariff provisions.

Non-active

corrosion

Non-active corrosion is corrosion that has been discovered

and treated (coated, chemically inhibited, or otherwise con-

trolled) to stop the metal particle loss. Non-active corrosion

areas are often monitored over time to verify the corrosionprocess is in fact halted.

NDT Pipeline non-destructive testing typically consists of:

1. Radiography (X-rays): identifies laminations and weld

discontinuities. 2. Ultrasonics: locates lamination in the

walls of pipe; determines wall thicknesses. 3. Magnetic

particle inspection: tests for surface cracks in welds and

component bodies. 4. Dye penetrant: locates surface cracks

in welds or component bodies. 5. Ammonium persulfate:

identifies hard spots in welds due to arc burns.

Noteworthyindustry practices In pipeline integrity management, noteworthy industrypractices are unique methods or procedures found to be in

use by one or more pipeline operators and deemed to be

notable such that their adoption by other operators could

significantly enhance the implementation of pipeline integ-

rity management requirements by those other operators.

NOR Notice of readiness.

NYMEX New York Mercantile Exchange.

Octane number A measure of the detonation quality of gasoline. The higher

the octane number, the higher the resistance to engine

knock.

Office of PipelineSafety

OPS is the agency within the U.S. Department of Trans-portation, Pipeline and Hazardous Materials Safety Ad-

ministration (PHMSA), that is responsible for regulating

the safety of design, construction, testing, operation, main-

tenance, and emergency response of U.S. oil and natural

gas pipeline facilities. OPS can be contacted at 202-366-

4595 or for more information see

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Oil Sands Deposit A natural reservoir containing or appearing to contain an

accumulation of oil sands separated or appearing to be sep-

arated from any other such accumulation.

Oil Sands Heavy Upgraded heavy sour crude oil, and bitumen to which light

oil fractions (i.e. diluent or upgraded crude oil) have been

added in order to reduce its viscosity and density to meetpipeline specifications.

Oil shale A fine-grained, sedimentary rock containing kerogen, a

partially formed oil.

Oilfield services Service companies that do work (e.g. cementing, perforat-

ing, trucking, logging, etc.) in and for the oilfield.

Olefins A group of petrochemicals characterized by their straight

or branched structure (such as ethylene, propylene and

butadiene).

One-Call system A one-call system is a system that allows excavators (indi-

viduals, professional contractors, and governmental organ-izations) to make one telephone call to provide notification

of their intent to dig to underground facility operators. The

one call center will then notify all underground facility op-

erator members of the intended excavation along with the

date and location of the excavation. The facility operators

or, in some cases, the one-call center can then locate the

facilities before the excavation begins so that extra care can

be taken to avoid damaging the facilities.

On the pump A well that no longer flows from natural reservoir energy

but is produced by means of a pump.

On-peak period The period of relatively high power demand.On-site Facilities located on the same or geographically contigu-

ous property. Piping connecting ASTs with pipeline facili-

ties are considered on-site up to the point where it crosses

through the dike wall surrounding the AST.

OPEC Organization of Petroleum Exporting Countries an

international oil cartel formed in 1960.

Operating stress Operating stress is the stress imposed on a pipe or structural

member under operating conditions. This term normally re-

fers to stress resulting from the internal forces due to the

pressure of the gas or liquid in the pipeline; however, otherforces such as thermal growth, expansion, or contraction

may impose stress as well.

Operational life The period from the start of installation of the storage tank sys-

tem to the completion of the closure of the storage tank system

O&M manual Operations and maintenance (O&M) manual is the com-

mon term for the set of comprehensive procedures that fed-

eral pipeline safety regulations require pipeline operators to

develop and follow. Procedures in the O&M manual should

cover pipeline operations, maintenance, and response to

abnormal events and emergencies.

Operator The individual or person controlling a pipeline from a cen-tral control room using a SCADA system. Some pipeline

companies also call this person a dispatcher or control-

ler. Also the company responsible for the drilling, comple-

tion, production, or pipeline transportation operations.


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Appendix 635

OQ Operator Qualification, the act or method for a pipeline op-

erator to become qualified.

Organization costs Direct costs incurred in the creation of a new business

organization.

OSHA

(Administration) Occupational Safety and Health Administration.Out-of-service A storage tank system that:

(a) is designated as an out-of-service system by owner or ope-

rator notification by the relevant regulatory authorities;

(b) is empty; and

(c) Does not have substances transferred into or

withdrawn from.

Out-turn Quantity of oil unloaded from a vessel at discharge point.

Ovality Ovality is a condition in which the internal diameter of the

pipe is not consistent around the entire circumference of

the pipe. This can be thought of as the internal diameter ofthe pipe being, to varying degrees, egg-shaped. Ovality can

be measured by inline inspection tools known as caliper

pigs or geometry pigs.

Overfill A release or discharge that occurs when a tank is filled be-

yond its capacity.

Owner Any person/company as owning a facility.

Oxygenate Oxygen containing blend stocks favored for their octane and

their clean burning quality. Includes MTBE and ethanol.

PADD Petroleum Administration for Defense District that defines

a market area for crude oil in the U.S.

Paraffinic High in paraffin content.Paraffinic naphtha A favored quality of naphtha for ethylene plant feedstock.

P/C Part-cargo.

Pentanes Plus A mixture mainly of pentanes and heavier hydrocarbons

that ordinarily may contain some butanes and is obtained

from the processing of raw gas, condensate, or crude oil.

Permafrost Soil that has remained frozen continuously for more than

two years.

Performance

curves

Performance characteristics for a pump produced by the

pump manufacturer.

Petrochemicals Chemicals derived from petroleum; feedstocks for the man-ufacture of plastics and synthetic rubber. Petrochemicals

include benzene, toluene, xylene, styrene, and methanol.

Petroleum Oil, including crude petroleum oil, and other hydrocarbons,

regardless of gravity, which are not the result of condensa-

tion of gas after it leaves the reservoir.

Petroleum gas Petroleum gas means propane, propylene, butane (normal

butane or isobutanes), and butyline (including isomers) or

mixtures composed predominantly of these gases, having

a vapor pressure not exceeding 208 psi (1434 kPa) gage at

100 F (38 C).

Petroleum liquids Crude oil, condensate, and any finished or interme-diate products manufactured or extracted in a petroleum

refinery.


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Petroleum Pipeline Facilities through which, crude oil, natural gas or other

petroleum products are moved in transportation, includ-

ing pipe, valves, and other equipment attached to the pipe,

compressor units, metering stations, regulator stations, de-

livery stations, holders, and fabricated assemblies.

Petroleum Products The end result of the refining process (include fuels suchas gasoline, aviation fuel, diesel and heating oil; products

such as solvents and lubricants; and raw materials for man-

ufacturing petrochemicals.

Petrochemicals Chemicals derived from petroleum; feedstock for the man-

ufacture of plastics and synthetic rubber. Petrochemicals

include benzene, toluene, xylene, styrene, and methanol.

Pig Pig is a generic term signifying any independent, self-

contained device, tool, or vehicle that is inserted into

and moves through the interior of a pipeline for inspect-

ing, dimensioning, or cleaning. These tools are commonlyreferred to as pigs because of the occasional squealing

noises that can be heard as they travel through the pipe.

Pigging The act of pushing a pig through a pipeline to clean the in-

ner surface of the pipeline, to remove debris from the pipe-

line, to conduct internal inspections of the pipeline, or to

separate batch interfaces.

Pigging facilities Facilities for launching and receiving pigs.

Pipe or piping Any hollow cylindrical or tubular conveyance through

which hydrocarbon liquids flow.

Pipe locator Device used for locating underground pipe.

Pipeline All parts of the physical facility through which, crude oil,natural gas or other petroleum derivatives are moved in

transportation, including pipe, valves, and other equipment

attached to the pipe, compressor units, metering stations,

regulator stations, delivery stations, holders, and fabricated

assemblies.

Pipeline capacity Pipeline capacity refers to the maximum flow rate that can

be transported through the pipeline system in a given pe-

riod of time under the conditions that prevail in the avail-

able facilities.

Pipelinecomponents A pipeline component is some feature or part of a pipeline,such as pipe, valves, fittings, flanges, closures, tees, or ca-

thodic protection.

Pipeline corridor A pipeline corridor is a linear area where two or more pipe-

lines (either part of the same or different pipeline systems)

are closely grouped in a single right-of-way.

Pipeline crossing A pipeline crossing is a point where two or more pipelines

cross without a physical connection existing between the

pipelines.

Pipeline facilities Are pipe systems, rights-of-way and any associated equip-

ment, gathering lines, pumping facilities, buildings.

Pipeline integrity State of a pipeline that demonstrates the ability to with-stand the stresses imposed during operations.

Pipeline

intersection

A pipeline intersection is a point where a physical connec-

tion between two pipelines occurs.


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Appendix 637

PLC Programmable Logic Controller is a field device that per-

forms real-time data gathering, calculating, storing and

controlling functions including close loop control based on

current operating conditions. It can upload to and down-

load data from the host SCADA. A distinguishing function

of a PLC, compared to a flow computer or an RTU, is itsability to control valves, regulators and even pump/com-

pressor stations.

Pressure relief

valve

A valve designed to open automatically to relieve pressure

in a segment of a pipeline in order to keep the pressure be-

low the maximum allowable pressure level.

Polymers Made from monomers. The most common include

widely traded plastics like polyethylene, polypropylene and

polystyrene.

PONA Paraffin, olefins, naphthenes and aromatics content.

Posted Price A statement of the price requested by a seller of crude oil orproducts. The list price.

Pour Point Lowest temperature which oil will readily flow without dis-

turbance when chilled.

PPM Parts per million.

Pressure relief

valve

A pressure relief valve is a mechanical safety device that

provides protection to a pressurized container, such as a

pipeline, by reducing the internal pressure by releasing it

outside the container.

Pressure surge A sudden increase of pressure moving through the pipeline

at acoustic speed, generated by a sudden change in flow

rate or velocity.Pressure test A test to determine the integrity of integral piping.

Pressure transient Pressure which occurs in a pipeline with limited frequency

and within a limited period of time, such as surge pressures

and thermal expansions, if not occurring most of the time.

Pressurized piping Piping through which hydrocarbon liquid flow due to a

pump that is not located at the delivery terminal.

Primary device Primary device is the device directly or indirectly in contact

with the fluid and generating a signal according to a known

physical principle when applied to the fluid. For example,

the primary devices for an orifice metering system includethe orifice plate, meter tube, fitting and pressure taps.

Primary energy Energy (e.g., heat or motive power) that is produced first

(from the combustion of coal, crude oil and natural gas; and

electricity produced from nuclear, wind or hydropower),

versus secondary energy (e.g., thermal electricity and mo-

tive power from gasoline) which is produced by consuming

primary energy.

Processing Plant A facility designed to separate substances or make new sub-

stances through chemical reactions, procedures or physical

actions.

Product Any commodity made from oil or gas and includes refinedcrude oil, crude tops, topped crude, processed crude petro-

leum, residue from crude petroleum, cracking stock, un-

cracked fuel oil, fuel oil, treated crude oil, residuum, gas


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oil, casinghead gasoline, natural gas gasoline, naphtha, dis-

tillate, condensate, gasoline, used oil, kerosene, benzene,

wash oil, blended gasoline, lubricating oil, blends or mix-

tures of oil with one or more liquid products or byproducts

derived from oil or gas, and blends or mixtures of two or

more liquid products or byproducts derived from oil or gas,etc.

Products line A pipeline used for the shipment of refined products.

Products Pipeline

System

A pipeline with pumping stations, delivery pipeline termi-

nals, tankage, and other apparatus used for the transporta-

tion of various liquid hydrocarbon products as opposed to

crude oil.

Protective coating A protective coating is a substance or material applied to

the exterior of the pipe or a pipeline component to prevent

contact with the outside environment. Protective coating is

generally applied to prevent corrosion. Many types of pro-tective coatings are used on pipelines, including coal tar,

tape wraps, and fusion bonded epoxy compounds.

Pump casing

pressure

Pressure of the fluid inside of a centrifugal pump just be-

fore the fluid leaves the pump.

Pump efficiency Ratio of the pump hydraulic power output to pump power

input.

Pump stations Facilities placed along the route of a pipeline to keep oil

moving along with pressure or suction.

Pygas Pyrolysis gasoline. A naphtha-range product with a high

aromatics content used either for gasoline blending or as a

feedstock for a BTX extraction unit. Pygas is produced inan ethylene plant that processes butane, naphtha or gasoil.

Rack pricing Selling to petroleum jobbers o

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