GIS 40-101 - Skid Mounted Units Procurement - 0900a86680327f68

8/10/2019 GIS 40-101 - Skid Mounted Units Procurement - 0900a86680327f68

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16 December 2005 GIS 40-101Guidance on Industry Standard for Skid Mounted Units Procurement

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11.5. Pressure instruments................................................................................................ 21

11.6. Temperature instruments.......................................................................................... 21

11.7. Level instruments...................................................................................................... 22

11.8. Flow instruments....................................................................................................... 22

11.9. Control valves and regulators ................................................................................... 23

11.10. Pressure relief devices.............................................................................................. 23

12. Inspection and testing.......................................................................................................... 23

12.1. General..................................................................................................................... 23

12.2. Fabricated piping inspection ..................................................................................... 24

12.3. Assembly inspection ................................................................................................. 24

12.4. Structural inspection ................................................................................................. 24

12.5. Instrumentation inspection........................................................................................ 25

12.6. Electrical inspection .................................................................................................. 25

12.7. Painting inspection.................................................................................................... 25

12.8. Hydrostatic or pneumatic testing............................................................................... 25

12.9. Insulation inspection ................................................................................................. 25

12.10. Certifications............................................................................................................. 26

13. Preparation for shipment...................................................................................................... 26

13.1. General..................................................................................................................... 26

13.2. Partially dismantled and properly prepared export shipment ..................................... 26

13.3. Openings protection.................................................................................................. 26

13.4. Skid preparation........................................................................................................ 27

14. Documentation .................................................................................................................... 27

List of Figures

Figure 1 Skid end design ........................................................................................................... 28


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1. Scope

a. This GIS provides guidance on health, safety and environmental legislation, good designpractice, and technical and economic considerations for skid mounted units. The design

information included in this specification is not intended to cover complete details. Theguideline outlines regulations, design considerations, and recommends a configuration

which can be scaled to adapt to the specific facilities which can differ due to layouts andproduction capacity.

b. This standard is intended to guide the purchaser in the use or creation of a fit-for-purpose

specification for enquiry or purchasing activity.

c. This document may refer to certain local, national or international regulations but theresponsibility to ensure compliance with legislation and any other statutory requirementslies with the user. The user shall adapt or supplement this document to ensure compliancefor the specific application.

2. Normative references

The following normative documents contain requirements that, through reference in this text,constitute requirements of this technical practice. For dated references, subsequent amendments to, orrevisions of, any of these publications do not apply. However, parties to agreements based on thistechnical practice are encouraged to investigate the possibility of applying the most recent editions ofthe normative documents indicated below. For undated references, the latest edition of the normativedocument referred to applies.

American Institute of Steel Construction (AISC)

AISC S326 Specification for the Design, Fabrication and Erection of Steel for

BuildingsAISC S329 Allowable Stress Design Specification for Structural Joints Using

ASTM A325 or A490 Bolts

AISC S335 Specification for Structural Steel Buildings Allowable Stress Designand Plastic Design

American Petroleum Institute (API)

API RP 2A-LRFD Recommended Practice for Planning, Designing and ConstructingFixed Offshore PlatformsLoad and Resistance Factor Design

API RP 2A-WSD Recommended Practice for Planning, Designing and Constructing

Fixed Offshore PlatformsWorking Stress Design

API SPEC 5L Specification for Line Pipe

API RP 551 Process Measurement Instrumentation

API STD 660 Shell-and-Tube Heat Exchangers for Refinery Service

API STD 661 Air-Cooled Heat Exchangers for General Refinery Service

American Society of Civil Engineers (ASCE)

ASCE 7 Minimum Design Loads for Buildings and Other Structures

American Society of Mechanical Engineers (ASME)

ASME B16.5 Pipe Flanges and Flanged Fittings

ASME B31.3 Chemical Plant and Petroleum Refinery Piping

ASME BPVC Boiler and Pressure Vessel Code; SEC VIII D1, Rules for Construction of Pressure Vessels, Division 1; SEC IX, Qualification


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Standard for Welding and Brazing Procedures, Welders, Brazers,and Welding and Brazing Operators

American Society for Testing and Materials (ASTM)

ASTM A36 / A36M Standard Specification for Structural Steel

ASTM A53 Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-

Coated Welded and Seamless

ASTM A106 Standard Specification for Seamless Carbon Steel Pipe for High-Temperature Service

ASTM A123 Standard Specification for Zinc (Hot-Dip Galvanized) Coatings onIron and Steel Products (AASHTO M111)

ASTM A153 Standard Specification for Zinc Coating (Hot-Dip) on Iron and SteelHardware (AASHTO M232)

American Welding Society (AWS)

AWS D1.1 Structural Welding Code Steel

BP

GIS 40-102 Skid Mounted Units Lifting and Rigging Requirements

GP 12-25 Earthing / Grounding

GP 40-10 Structural Skids and Skid Mounted Units Guide

Illumination Engineering Society (IES)

IES Lighting Handbook

National Electrical Manufacturer's Association (NEMA)

NEMA 250 Enclosures for Electrical Equipment (1000 Volts Maximum)

National Fire Protection Association (NFPA)NFPA 70 National Electrical Code (NEC)

Occupational Safety & Health Administration (OSHA)

29 CFR, Part 1910 Walking-Working Surfaces, Subpart D

US Department of the Interior (DOI), Minerals Management Service (MMS)

30 CFR Part 250 Oil and Gas and Sulfur Operations in the Outer Continental Shelf

Uniform Building Code (UBC)

3. Definitions

dead loads

Loads which are permanent parts of the structure such as empty permanent equipment, empty pipe,cable and conduit, grating, instruments, valves, structural members, hand rails and platforms.

erection loads

Loads which are temporary forces caused by erection of structures or equipment.

fluid loads

Weight of operating or hydrotest fluid in equipment and pipe (whichever is larger).

impact loadsLoads which are an equivalent static force caused by a moving object.


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live loads

Loads which are temporary in nature such as occupants, repair and maintenance tools/equipment.

maintenance loads

Loads which are temporary forces caused by the dismantling, repair or painting of equipment.

padeye

A small fitting with a hole, used to provide a fairlead, or guide a line; a metal eye on a small plate towhich blocks, lines and other objects are shackled.

seismic loads

Forces associated with acceleration of the skids as it is supported on the offshore deck during a

seismic event.

transportation loads

Forces associated with pitching, rolling and heaving when a skid is aboard an offshore transport

vessel.

thermal loads

Thermal Loads are those forces caused by a change in temperature which may result from bothoperating and environmental conditions. Such forces shall include those caused by vessel or pipingexpansion or contraction and structures expansion or contraction.

vibration loads

Loads which are those forces caused by vibrating machinery such as pumps, blowers, fans and

compressors. Included are surge forces similar to those acting in fluid cokers, hydroformers, crackersand pipe.

wind loads

Minimum design wind loading for skids shall be based on 110 mph. Force coefficients and loads shallbe per API-RP 2A.

4. Abbreviations

For the purpose of this GIS, the following abbreviations apply:

AWG American Wiring Gauge

DC Direct Current

LRFD Load and Resistance Factor Design

NDT Non Destructive Test

NPS Nominal Pipe Size

OD Outer Diameter

PVC Poly Vinyl Chloride

RTD Resistance Temperature Detector

WSD Working Stress Design


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5. Skid requirements

5.1. General

a. Unless otherwise approved by Company, outside skid dimensions shall not exceed 12.2 m

(40 ft) long by 3.7 m (12 ft) wide by 4.3 m (14 ft) high.

The width and length of skids are normally dependent on the intermediate and finalmodes of transportation. Skid width may be determined by the local requirements ofroadways or the width of the bay of a cargo ship hold. The height if transported bytruck on roads is determined by the height of overpasses and overhead electricalpower lines. Special permitting may alleviate the height restrictions as someobstacles like overhead power lines can temporarily be removed. If a skid is built onthe coast of an ocean or major water way and the facility is offshore on near shore,then the possibility is that a barge could be used and height and width restrictionsmay be increased.

b. Skid mounted equipment, piping, vessels, and other components shall be within confinesof skid outer edge. See GP 40-10.

5.2. Arrangement

a. Equipment shall be mounted and installed in accordance with manufacturersrecommendations. Skid shall be:

1. Rectangular.

2. Designed such that equipment may be removed or maintained.

3. All grating panels shall span in the same direction and shall be removable.

b. Piping and instrumentation systems shall be designed to enable isolation and removal ofequipment, including:

1. Isolation block valves and spool pieces (or unions) without bending or cutting pipe.

2. Drainable piping systems.

3. Skid piping tie-ins flanged and piped to skid edge.

c. Access shall be provided to accomplish daily operating tasks and routine maintenancefrom skid edge or through open areas with walkways, platforms, or both as follows:

1. Stairs, ladders, cages, platforms, handrails, etc., shall be provided as required, andshall conform to the following requirements as well as those of the local country

regulations similar to OSHA.

2. Instrumentation panels and local gauge boards shall be accessible from one side of

skid or centralized in an open access area.3. Manual valves, switches, pushbuttons, and other devices required for daily operation

shall be located within convenient reach of skid edge or an open access area.

4. Access areas with walkways or platforms shall be free of tripping hazards, overheadobstructions, dead ends, and constricted passageways.

6. Structural design

6.1. General

a. USA codes and standards are stated by this GIS however, equivalent European or local

country codes and standards may be used if agreed by BP.


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6.2.10. Vibration loads

a. Rotating equipment skid components shall be designed such that natural frequency of skid,as a whole or as individual components, lies outside the range of 0.50 to 1.50 times

equipment operating frequency.

b. Dynamic stress and deflection amplitude shall not exceed equipment tolerances.

c. Maximum peak vibration velocity shall be less than 2,54 mm (0.1 in) per second.

6.2.11. Wind loads

a. Wind loads for offshore application shall be calculated in accordance with API RP2A-WSD or API RP 2A-LRFD.

b. If storm windloads are combined with static loads, a 20 % increase in allowable stress shallbe permitted.

6.3. Lifting

a. Skid supplier shall provide lifting rigging design. Review requirements in GIS 40-102.

b. For four-sling pyramid lifting arrangements (hook point located directly above packagecenter of gravity), lifting slings, frames spreader bars, padeyes, shackles, and majorstructural members of skid assembly shall be designed for two load conditions inaccordance with the following:

1. If lift load is split equally between the two diagonals:

a) Calculated Weight Contingency 1.1

b) Impact: Onshore lift 1.5

c) Impact: Offshore lift 2.0

2. For skew load effect, a 25%-75% split of lifting load shall be applied across the two

diagonals:

a) Calculated Weight Contingency 1.1

b) Impact: Onshore lift 1.15

c) Impact: Offshore lift 1.40

3. For lifts with spreader bars, approval for percent split and impact factors shall beobtained from Company.

4. For lift conditions, no increase in basic allowable stresses shall be permitted.

5. Maximum loads on shackles shall not exceed manufacturers testing load on shacklesand maximum safe working load times a factor of 1.5.

6. Maximum loads on slings shall not exceed 33% of certified minimum breakingstrength of slings.

c. Padeyes and connections to supporting structural members shall be designed for maximumsling loads in combination with an out-of-plane horizontal force to compensate for anyside loading on padeye.

1. Horizontal force shall be not less than 5% of sling load applied perpendicular topadeye at pinhole center.

2. If spreader bars are used, value shall be 10%.

3. Padeye design shall include the following stress checks:

4. Bearing against shackle pin.

5. Double shear for pin pull-out.


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6. Tension through net section.

7. Combined stresses at various locations.

d. True sling angles shall be limited to a range from 60 to 75 degrees from horizontal.

e. If large spreader frames are used, vertical slings may be permitted.

6.4. Pulling

a. Skid assemblies shall have transverse tubular member (pull bars) or padeyes designed forpulling in accordance with Figure 1.

b. Design pull forces shall be 20% of gravity operating load of skid assembly, minimum.

c. For skew effect, pull load shall be distributed to each padeye of end of pull bar using 25%-

75% distribution.

d. Padeyes for pulling shall be designed:

1. With same safety factor as lifting padeyes.

2. Same as lifting padeyes, except horizontal design load shall be 50% of calculatedpulling load on each padeye.

6.5. Structural details

6.5.1. Load carrying members

a. Load carrying members in skid assembly shall be compact sections.

b. Spacing of transverse bracings shall not be greater than Lc of load carrying longitudinalskid beams, where Lc is as defined in AISC.

c. Webs of load carrying beams shall be designed to transmit shear and bearing loads withoutcrippling.

d. Plate, stiffeners, and beam or tubular sections in skid assembly shall be 6,35 mm (0.25 in)thick, minimum.

e. Metal thickness at points of equipment bolting shall be 9,5 mm (0.375 in), minimum.

f. Structural members with cut-outs of holes shall be checked for stress levels at net sections,including stress concentrations.

g. If stresses exceed allowables, reinforcement shall be provided.

6.5.2. Connections

a. Connections shall be designed to develop full strength of connecting members.

b. Unless otherwise specified, connections shall use full penetration welds.

c. Fillet welds, partial penetration welds, and bolted connections, if approved by Company,shall be sized in accordance with AISC.

6.5.3. Padeyes

a. The padeyes and skid base shall be designed for an offshore lift based on the requirementsof API RP 2A.

b. The skid shall be equipped with 4 padeyes adequately designed and properly spaced toensure a safe lift without the use of a spreader bar or spreader frame if possible. Slings,shackles and fittings shall be sized to meet the requirements of API RP 2A for offshore

lifts. Sling angles shall be greater than or equal to 60o

.


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c. The padeyes shall be located to provide for lifting the skid package near level with themaximum tilt allowed to be 5 degrees from horizontal. Equipment and facilities shall belocated on the skid to avoid interference with slings during lifting operations.

d. Padeyes on each structural unit (skid base, lifting frame, or spreader bar) shall be identicaland designed for maximum lifting load.

e. Padeyes shall be located to avoid interference between rigging and skid assembly andorientated such that primary sling load is in the plane of padeye main plate.

f. Padeyes shall be designed for specific shackle and sling size with the following clearancerequirements:

1. Pinhole diameter shall be 3 mm (0.125 in) to 6 mm (0.25 in) larger than shackle pindiameter.

2. Clearance between shackle jaw width and padeye (main plate plus cheek plates)thickness shall be 10 mm (0.375 in), minimum, 16 mm (0.625 in), maximum.

3. Clearance between outer radius of main plate and sling shall be 0.5 times sling

diameter.

g. Padeye designs shall avoid passing tensile stresses through material thicknesses.

6.6. Structural materials

a. Skid and support structural steel shapes, plates, pipes rolled from plate, and bars shall beASTM A36 / A36M.

b. Seamless steel structural tubulars shall be ASTM A106 Grade B, ASTM A53 Grade B, orAPI 5L Grade B.

c. Bolts, nuts, washers, and joint design shall be in accordance with AISC S329.

d. Bolts shall conform to ASTM A193 Grade B7.

e. Nuts shall conform to ASTM A194 Grade 2H.

f. Bolts and grating clips shall be hot-dip galvanized in accordance with ASTM A153.

g. Grating and handrails shall be hot-dip galvanized in accordance with ASTM A123.

h. Floor plate shall be non-skid, checkered, or raised-pattern.

7. Fabrication

7.1. Skid construction

a. Dimensional tolerances shall conform to API RP 2A-WSD or API RP 2A-LRFD and AWS

D1.1.

b. Weld slag and splatter shall be removed.

c. Burrs, temporary tack welds, and sharp edges shall be ground smooth prior to coating.

d. Skid mounted assemblies, including piping, guards, ladders, platforms, and railings, shallbe erected prior to coating.

e. If disassembly for shipment or field erection is required, clips shall be installed andrequired connection materials, such as bolts, nuts, and washers, plus an additional 10%shall be furnished.

f. Skids shall be fabricated and constructed in accordance with AISC S326 for welded

components and AISC S329 for bolted components.


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4. Secondary equipment support member and walkways, ladders, handrails, stairs, anddecking shall be 100% visual inspected.

5. If defective welds are discovered, additional testing shall be required. Amount ofadditional testing shall be obtained from Company.

7.3. Drainage and access areasa. Areas beneath equipment or vessels subject to spills or leaks shall:

1. Have sloped drainage areas, sloping 25 mm per 2,540 mm (1 inch per 100 inches),minimum.

2. Be constructed with 6 mm (0.25 in) plate, minimum.

3. Be supported in spans of 1 m (36 in), minimum.

b. Grating shall:

1. Be non-skid.

2. Be serrated bar type.

3. Have a 38 mm by 5 mm (1.5 in by 0.1875 in) opening size, minimum.

4. Not be used as a mounting surface for equipment or supports

c. Unsupported grating span shall be 1200 mm (48 inches), maximum.

d. Grating joints shall occur at points of support.

e. Grating bearing bars shall be 38 mm by 6 mm (1.5 in by 0.25 in), minimum, on 32 mm(1.25 in) centers.

f. Floor plate shall be 6 mm (0.25 in) thick, minimum, and have non-skid construction.

g. Maximum unsupported spans shall be 1 m (36 inches), maximum.

h. Platforms and stairs shall be constructed with grating.

1. Platforms shall be 1 m (36 in), minimum, in width.

2. Ladders shall be 400 mm (16 inches), minimum, in width.

3. Rungs shall be deformed bar 19 mm (0.75 in), minimum, in diameter.

8. Piping

8.1. Design

a. NPS of 1 1/4, 2 1/2, 3 1/2, and 5 shall not be used.

b. Carbon steel process piping shall be seamless.

c. Process piping shall be hydrostatically tested to 1.5 times maximum allowable workingpressure in accordance with ASME B31.3.

d. Skid external connections shall be flanged and shall be NPS 1, minimum.

1. Socket welded, flange connections shall be used for process piping components NPS1 to 1 1/2.

2. Weldneck flange connections shall be used for carbon steel process piping

components NPS 2 and larger.

3. Skid drain connections shall be 25 mm (1 in), minimum, and may be threaded.

4. Lap joints shall be used in stainless steel service, except in cyclic service or ifvibration is present.


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e. Piping shall conform to applicable sections of ASME B31.3.

f. Forces and moments on equipment nozzles shall not exceed equipment manufacturersrecommendations or industry standards for the equipment.

g. Flanges shall conform to ASME B16.5.

h. Process drains and vents shall be connected to a common header and run to edge of skid.

8.2. Equipment piping

a. Rotating equipment suction and discharge piping shall have breakout spool pieces.

b. Rating of piping flange shall match connected equipment nozzle.

c. Spool pieces shall be removed during shipping.

d. Block valve shall be provided near each nozzle on auxiliary equipment items for isolationpurposes.

e. Unless specified otherwise, cooling water connections to equipment shall be designed with

upward flow.

f. Drains shall be provided at low points.

g. Vents shall be provided at high points.

h. If temperature control is not provided, a throttling valve shall be installed on one side ofeach cooler or jacket water system.

8.3. Instrumentation tubing

a. Instrument tubing shall have OD of 10 mm (0.375 in), minimum, except for control panelswhich shall have minimum tubing OD of 6 mm (0.25 in).

b. Impulse lines shall:

1. Be tubing, if practical.

2. Be less than 9 m (30 ft).

3. Have a diameter of 10 mm (0.375 in) OD, minimum.

4. Be seamless.

c. If slopes are not required, tubing runs shall be plumb or level. Bends shall be made withtubing benders sized for applicable tubing.

d. Tubing shall be routed in tray, on channel, or on angle.

1. Tubing shall be supported at least vertically every 1 m (3 ft), horizontally every 2,4 m(8 ft), and within 150 mm (6 in) of tangents on a change of direction.

2. Control panel tubing shall be tagged at both ends.

e. Instrument tubing runs shall be grouped.

1. For parallel runs, fittings, such as connectors, unions, and tees, shall be staggered andraised to enable breakout or tightening without distortion or damage to adjoiningtubing.

2. Groups shall be installed such that single lines may be removed without disturbingother tubing runs.

f. Tubing shall be 316 stainless steel with compression fittings.

g. Tubing valves shall be globe, needle, or ball type.


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h. Globe and needle valves shall have 316 stainless steel bodies and stems with Teflonpacking and stem tips or stem seats, minimum.

i. Approval of tubing and tubing fitting supplier shall be obtained from Company.

9. Equipment

a. Pressure vessels shall be designed and constructed in accordance with ASME BPVC,Section VIII, Division 1.

b. Welding personnel shall be qualified in accordance with ASME BPVC, Section IX.

c. Shell and tube heat exchangers shall be designed and fabricated in accordance with APISTD 660.

d. Air-cooled heat exchangers shall be designed and fabricated in accordance with API STD

661.

10. Electrical

10.1. General

a. Unless otherwise specified, electrical installation, equipment, and wiring shall be designedto operate in an ambient temperature of 40C (104F).

b. If skid unit is to be located in a hazardous (classified) area, equipment and wiring methodsshall be in accordance with NEC, Articles 500 through 503.

c. Control and alarm circuits shall be of fail-safe design. Alarm contacts shall open to initiatealarms.

10.2. Equipment

10.2.1. Motor controllers

a. Unless specified otherwise, motor controllers shall be furnished by others and be locatedoff skid.

b. Other control equipment and devices required to complete motor control system shall befurnished, installed, and wired by supplier.

10.2.2. Enclosures

a. Junction boxes, panel boards, and control enclosures shall be:

1. Corrosion resistant.

2. Compliant with specified NEC area classification.

3. NEMA Type 4X, minimum, in nonclassified, outdoor areas.

4. Equipped with drain and breather fittings.

b. Wiring inside enclosures shall be routed, bundled, and tied or supported in plasticconductor raceways.

c. Terminals in enclosures shall be mounted on stand-offs or on mounting strips.

10.3. Power

1. Each 480-volt load shall be supplied by an individual feeder.

2. Feeder shall be 480-volt, three-phase, 3-wire, ground-wire circuit routed directly to loadfrom a dedicated junction box located on skid edge.


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3. Feeder for each voltage level lower than 480 volts shall run to skid edge and shall connect toa single, skid-mounted junction box complete with terminals.

10.4. Wire and cable

a. Wire for voltages 600 volts and lower shall be single-conductor, stranded copper THHN /

THWN.1. Minimum conductor size for power circuits shall be 12 AWG.

2. Minimum conductor size for control circuits shall be 14 AWG.

b. Wiring for instrumentation shall be twisted, shielded, and either pair or triad construction,16 AWG.

10.5. Wiring methods

10.5.1. General

a. Interconnecting wiring shall be enclosed in conduit, raceways, junction boxes, or panel

boards.1. Conduit fittings shall be supplied and installed where required.

2. Drain fittings shall be installed in vertical conduit runs.

3. Sealing fittings shall not be poured.

b. Alarm, instrument, and control devices shall be wired to terminal blocks mounted injunction boxes.

c. Separate junction boxes and cable runs shall be provided for the following:

1. Thermocouples.

2. Instrument signals.

3. 120 volt AC control and power.

4. DC pulsed or switched signals.

d. Junction boxes shall be mounted at edge of skid. Final location of boxes shall be shown ondrawings. Prior to fabrication, approval for location shall be obtained from Company.

e. Terminals shall be tubular clamps and rated for 600 volts for power and 300 volts forinstruments and thermocouples.

1. Each terminal strip shall have 20% spare terminals.

2. Two conductors, maximum, shall be terminated at a single terminal point.

3. Terminals shall be numbered in compliance with wiring diagrams.

10.5.2. Wiring

a. Wires shall be tagged at both ends with slip-on plastic wire markers printed with legendindicated on wiring diagram.

b. Wiring shall be continuous without splices from terminal to terminal.

10.5.3. Conduit

a. Unless otherwise specified, conduit shall be rigid galvanized steel.

b. If specified for corrosive environments, conduit and fittings shall be copper-free aluminum

or coated with a factory-applied, chemically bonded PVC (40 mils, minimum).


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c. Watertight, flexible metal conduit shall be used for connections to motors and to otherelectrical equipment subject to vibration or requiring a flexible connection formaintenance.

d. Minimum conduit size shall be 19 mm (0.75 in), except that flexible conduit connectionsto instruments and other devices may be 13 mm (0.5 in).

e. Conduit connections to enclosures without factory-threaded hubs shall be made withwatertight threaded hubs.

1. Conduit shall enter enclosures from bottom or sides.

2. Horizontal conduit connections to enclosures shall be arranged for drainage away

from enclosure to conduit low-point drain fitting.

3. Conduit union shall be installed between conduit seal and enclosure.

10.6. Lighting

Illumination levels shall be in accordance with IES Lighting Handbook.

10.7. Grounding

a. Grounding shall be in accordance with GP 12-25 and NFPA 70, Article 250.

b. Two pads shall be welded to skid located at opposite corners of skid. Each pad shall havemechanical lug sized for Number 2/0 AWG conductor.

c. Frames and enclosures of electrical components, motors, vessels, tanks, and structuralparts shall be electrically bonded to skid.

1. Conduit, cable shielding, and electrical enclosures shall be electrically bonded toprovide continuous connection between respective items.

2. Cable shielding for analog and other low voltage instrument cables shall be grounded

only at main panel.

3. Total resistance between any device on skid and skid frame shall not exceed 0,1 ohm.

10.8. Nameplates

Electrical equipment, enclosures, and control stations shall be identified with nameplates.

a. Nameplates shall be stainless steel or laminated white / black / white phenolic engravedwith a black legend.

b. Nameplates shall be fastened with stainless steel screws.

11. Instrumentation11.1. General

a. Instrument system design shall comply with API RP 551 and 30 CFR, Part 250 foroffshore service.

b. Instruments of similar types shall be made by one manufacturer and part of a single modelor design series. Installation materials shall be similarly standardized.

c. Instrument ranges shall be selected such that normal operating range is between 35% and75% of instruments full range.

d. Indicating instruments shall be installed to place centerline of chart or indicator at

approximately 114 mm (4.5 ft) above operator access level.


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11.9. Control valves and regulators

a. Valve operators, pilots, positioners, or other accessories shall not be exposed to excessiveheat from adjacent piping or equipment.

b. Control valves shall be NPS 1, minimum, with flanged end connections and bolted

bonnets. Approval of smaller sizes for special services shall be obtained from Company.

c. Clearance shall be provided for removal of internals without removing valve or regulatorbody from line.

d. Regulators with threaded connections shall be installed with unions or flanges.

e. Block and bypass valves installed around control valves shall have bleed valve installedbetween upstream block valve and control valve.

f. If block and bypass valves are not installed around control valves, control valves shallhave handwheels.

11.10. Pressure relief devices

a. Pressure relief devices that discharge:

1. Vapor or gas containing hydrocarbons or other hazardous gases shall be piped to acommon relieving system.

2. Liquids containing hydrocarbons or other material that must be contained shall bepiped to a common closed-drain system.

b. If block valves are installed upstream or downstream of pressure relieving device, valve

shall have lock-open device. Discharge piping shall not be smaller than relief valve bodyoutlet.

c. If block valves are installed upstream of pressure relieving devices:

d. Block valves shall have a port greater than or equal to inlet port of relief valve.

e. Test inserts shall be installed between block valve and relief valve inlet.

f. Pressure relief valves shall be installed such that each valve may be maintained from gradeor from platform.

g. Rupture discs installed in series with pressure relief valves shall have rupture detectionassembly consisting of pressure gauge and excess-flow check valve.

h. Relieving scenarios and sizing calculations shall be provided for pressure relief devices.

12. Inspection and testing

12.1. General

a. Notice of the equipment's readiness for inspection and/or testing shall be given at least

three working days prior to the start of any of the following phases of fabrication:

1. Fabricating piping phase:

a) Notice is required when fabrication begins.

b) Notice is required when 50 percent of welding is complete.

c) Notice is required when welding is complete but before assembly, except when

assembly of unit will allow convenient 100 percent radiography weld inspection,both internally and externally.

2. Assembly phase: notice is required when assembly is complete.

3. Hydrostatic testing phase: notice is required when ready for hydrostatic testing.


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12.5. Instrumentation inspection

a. Check for compliance with specifications.

b. Check hookup according to instrument drawings and specifications.

c. Check for proper support of valves, instruments, air lines, etc.

d. Stroke valves and simulate operation. Test in accordance with project specifications.

12.6. Electrical inspection

a. Verify that component quantities and description are compatible with requirements.

b. Test in accordance with project specifications for the following items.

1. Perform point-to-point continuity test.

2. Check all equipment for proper voltage, phase and frequency.

3. Perform manual operation of all mechanical linkage for proper alignment.

4. Energize all equipment, run motors with couplings disconnected and perform

operational tests by causing relays, solenoids, etc. to function by simulation of controlaction to test integrity of circuit.

5. Perform high voltage test for conductors (including insulation where appropriate)and/or equipment involved.

6. In cases involving explosion-proof equipment, fabricator shall not pour seals until

inspection is completed.

7. Verify that grounding points are installed properly.

12.7. Painting inspection

a. Verify paint is in accordance with job specifications.

b. Check general appearance.

c. Verify that paint has been removed, if necessary, from all control valve stems and othermachined surfaces, instrument glass, nameplates, flange faces and other items that are notsupposed to be painted.

12.8. Hydrostatic or pneumatic testing

a. Hydrostatic testing is not required for individual sections of fabricated piping unlessspecified.

b. Piping on assembled skid units shall be pressure tested in accordance with ASME B31.3.

c. Test fluid shall contain sufficient ethylene glycol for protection if there is a possibility ofexposure to freezing temperatures after assembly and in transit to the job site.

d. An approved corrosion inhibitor shall be applied to the internal surfaces of all skidcomponents.

e. Hydrostatic or pneumatic testing shall be performed prior to painting and/or application ofinsulation.

12.9. Insulation inspection

a. Check proper materials and thicknesses.

b. Check banding, caulking and general workmanship.


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13.4. Skid preparation

a. All piping and handrails removed for shipment shall be properly tagged and secured to theskid from which it was removed.

b. A lifting sling assembly, including spreader bar, if required, for a minimum four-point

pickup, shall be furnished with each skid.

c. The completed skid, after being prepared for shipment, shall be test lifted to ensure abalanced and level lift and structural integrity. Measure deflection of skid to ensure nodamage to equipment.

d. The skid shall be securely fastened to the barge ship or other means of transport at the

designated tie down points.

14. Documentation

a. Data, drawings and welding procedures shall be submitted in accordance with purchaseorder specifications.

b. Inspection, material certifications and test reports (certified as necessary) shall besubmitted prior to shipment.

c. A certified structural design report shall be submitted prior to shipment.


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Figure 1 Skid end design

GIS 40-101 - Skid Mounted Units Procurement - 0900a86680327f68

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