Technical Training Gspc Gas

8/12/2019 Technical Training Gspc Gas

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City Gas Distribution AnOverview


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WHAT IS CITY GAS DISTRIBUTION?

CGD is the last component of the

Natural Gas value chain deliveringNatural Gas to end users in town andcities to meet the demand for a cleaner,more efficient, economical andenvironmentally-friendly energy source.


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CITY GAS DISTRIBUTIONCONCEPT

Development of Pipeline Network in a pre-defined geographical spreadMaintaining Different Levels of Gas Pressureto meet the Demand of various segments of

gas users - Domestic, Commercial, Industrialand Automobiles.Designing high pressure and mediumpressure network such that supply to anyconsumer is possible from either side.Design gas storage / Gas sourcing formaximum survival periodConsider Health, Safety & Environment at allstages


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Steps in the design of Gas DistributionSystem

Market demand estimated based oncomprehensive field survey of units coveringdomestic, commercial, industrial and transport

sectors. Demand forecast projection is carried out for 20-25 years.

Peak hour consumption estimated for network

design. The system is to be designed based on 20-25th

year projected demand at peak load in a phasedmanner.

Reconnaissance Route Survey within the town to


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Network design and optimization with availablesoftware

Design of Mother Station and Daughter /

Daughter booster station for CNG supply toautomobiles National / International standards adopted for

design.

Project implementation done subsequently.

Steps in the design of Gas DistributionSystem


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Battery Limits

Distri bution Zone

Transmission Distribution

City Gate Station T r a n s m

i s s i o

n L i n

e


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HP Network

MPB Network

CIT Y GATE

Domestic andCommercialUsers

DRS DRS DRS

MPA Network

CNG Mother Stations

LP Network

CONCEPT


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CGD PRESSURE REGIMESSr. No. Network Component Inlet from Inlet Pressure OutletPressure Outlet to

1 CGS Transmission line 99 - 60 barg 26 barg Steel Grid

2 Steel pipeline CGS 26 barg 26 14 barg DRS / CNG

3 DRS Steel pipeline 26 14 barg 4 1 barg MP MDPE pipeline

4 Service Regulators (SR) MP MDPE Pipeline 4 1 Barg 110 mBarg LP MDPE Pipeline

5 MP MDPE pipeline DRS 4 barg 4

1 barg

Industrial MRS &

CommercialConnections

6 LP MDPE Pipeline SR 110 mBarg 110 50 mBargRegulator of Domestic /

CommercialConnections

7 Industrial MRSMP MDPE pipeline

Steel pipeline

4 1.5 barg

26 14 barg

1.5 barg orcustomer specific pressure within

the supply range

Industrial internal pipeline

8Online / Mother CNGStation

Steel Pipeline 26 - 14 barg 250 Barg Vehicle at 200 Barg

9 Domestic Connections LP MDPE Pipeline 110 50 mBarg 21 mBarg Meter & Gas Stove

10 Commercial ConnectionsLP MDPE Pipeline

MP MDPE Pipeline

110 75 mBarg

4 1 Barg

75 mBarg orcustomer specific pressure withinthe supply range

Meter & Gas Stove


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City Gas Distribution Applicable Codes & Standards


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European Standard

S. No. STANDARD NO. DESCRIPTION

1 EN 12186 Gas supply systems - Gas Pressure Regulating Stations forTransmission and Distribution. Functional Requirements

2 EN 12279 Gas pressure regulating - installations on service lines

3 EN 1776 Gas supply systems - Natural gas measuring stations - Functionalrequirements

4 EN 1594 Gas supply systems- Pipeline for maximum operating pressure over16 bar- Functional requirements


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BS/DIN/ISO AND OTHERSTANDARDS


1 ISO- 15590-1 International Standard for Petroleum and natural gas industries - Inductionbends, fittings and flanges for pipeline transportation systems

3 BS 6755: Part 2 Testing of Valves

4 DIN 30672, Part I Coatings of corrosion protection tapes and heat-shrinking products forpipelines for operational temperatures upto 50 oC

6 DIN 30670 Polyethylene coatings for steel pipes and fittings


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DIRECTORATE (OISDSTANDARDS)


1 OISD-226 Natural Gas Transmission Pipelines & City Gas Distribution Networks

2 OISD-GDN-115 Guidelines on Fire Fighting, Equipment and Appliances in Petroleum Industry

3 Fire Protection Manual-TAC

Fire Engines, Trailer Pumps and Hydrant Systems

4 OISD- Standard- 141 Design and Construction requirements for cross country hydrocarbon pipelines

5 OISD-Std-118 Layouts for Oil and Gas Installations


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AMERICAN PETROLEUMINSTITUTE (API)


1 API Standard 1104 Welding of Pipelines and Related Facilities

4 API Specification 5L Specification for Line pipe

5 API Spec. 6DSpecification for Pipeline Valves ( Gate, Plug, Ball andCheck Valves)

7 API Standard 1102 Specification for steel pipeline crossing & highways.


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AMERICAN GAS ASSOCIATION(AGA)


1 AGA Purging Principles and Practices

2 IGE/TD/1 Steel Pipelines for High Pressure Gas Transmission

5 AGA: Report No. 7 Measurement of Gas by Turbine Meters

6 AGA Report No.3 Orifice metering of Natural Gas and other related Hydrocarbon fluids

7 AGA-Report No 8 Compressibility factors of Natural Gas and other related Hydrocarbongases


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City Gas Distribution System Components


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CGD - InfrastructureMajor Constituents of CGD are;

City Gate stationPipeline Network

Steel PipelinesPoly Ethylene PipelinesGI / Cu Pipes

Regulating StationsDistrict Regulating Stations

Service RegulatorsDomestic / Commercial / Industrial Regulators

Metering Stations / Metering & RegulatingStations

CNG Stations


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CITY GATE STATION (CGS)

CGS is the location of Custody Transferfrom Transmission Company toDistribution Company.


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CITY GATE STATION (CGS) Inlet & Outlet isolation valvesKnock Out Drum (KOD), If requiredFilterMetering Unit (Turbine / Orifice / Ultrasonic)Gas Chromatograph (GC), If requiredPre-heater ( if required )Pressure reduction skid comprising

Active & monitor RegulatorsStream discrimination arrangementSlam shut valve for over & under pressure protectionCreep relief valves.

Odorising Unit


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STEEL PIPELINE

The Steel Grid pipeline sizes is 12 NB & 8NB whereas, spur lines shall be of 6 NB & 4NB.Steel pipelines used in the distribution system is fullycoated. The coating is extruded polyethylene, witheach weld joint coated with either heat shrink sleevesor field applied tape.Prior to the pipeline being put into service, thedistribution pipeline to be non-destructively tested bytwo methods. Firstly, welds would be radio graphed

and, secondly, the completed pipeline extensionwould be hydro-statically tested at a higher pressurethan its operating pressure.

After hydrostatic testing, the pipeline to be dried,purged and filled with natural gas. The testing and

commissioning procedures will be detailed during thedetailed design phase of the project.


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STEEL PIPELINE

To protect the pipeline from corrosion, a cathodicprotection (CP) system of impressed current isproposed. During the detailed design phase, the

CP capability of the existing transmission systemwill be investigated to establish if it has thecapacity to provide CP to the extension. If it isfound that the existing system does not have the

capacity, additional CP facilities will be designed.The steel grid is installed at a minimum depth of1.0 meter cover, and in accordance with Indianrequirements.


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MDPE PIPELINE

The distribution pipe is with StandardDimension Ratio (SDR 9) for 20 mm, (SDR)11 from 32 mm up to 63 mm & (SDR) 17.6 for

above 63 mm. The term SDR is defined asthe normal outside diameter (DN) divided bythe minimum wall thickness.It is standard practice in India to have a

minimum 1.0 meter cover. This additionaldepth in a densely populated area would berecommended.

All MDPE pipe back filled with sand around it

to protect the plastic material.


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Medium Density PolyEthylene(MDPE) PipesTech Spec: IS 14885:2001 & ISO 4437Material Grade & Color: Internationally approved resins of PE 100grade of Orange colorMinimum Required Strength (MRS) of PE 100 grade pipe: 10 MPa

Pressure Class: SDR 9 (dia 20 mm), SDR 11 (dia 32 & 63 mm) andSDR 17.6 (dia 90, 110, 125 and 160 mm).Operating pressure: 4 bar (g).Operating temperature range: - 10 0 C to + 40 0 C.


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Advantages of PE pipes

High performance (Globally proven leak free system)More Flexibility, coil ability, ductility, High elasticityLow density (low weight, high strength to weight ratio)High resistance to corrosionLow heat conductivity (small thermal loss)Smooth surfaces (low pressure losses due to low pipefriction)Easy to transport, handle and lay

Longer life


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Easier and speedier joining techniques to ensure leak tight joints by employing electro fusion techniquesHigher productivity, i.e., reduction in installation time (15minutes in case of PE against 4 hours in case of steel),

thereby lesser inconvenience to publicReduced number of joints, hence safer and leak freesystemLess time is consumed to repair PE damages as comparedto steel damagesGood squeeze off properties


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Longer design life of PE pipes (50 years) as compared tosteel pipeline (30 years)

Avoidance of NDT techniques in building premises, whichis very criticalSize of trench is less in case of laying of PE pipe ascompared to steel



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Crimping Fitting (Typical specification)

Used to connect u/g PE pipes with a/g GI pipesOperating Pressure: up to 4 bar (g)Operating Temperature: 40 0 CHydrostatic Test Pressure: Minimum hold Pressure of 10bar (g), for 1 hour durationPneumatic Test Pressure: Minimum pressure of 6 bar (g),for 1 hour durationPull out Test: Shall not fracture within the jointed assembly Shall withstand the Pneumatic pressure leak test Shall not leak


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District Regulating Stations


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District Regulating Station


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District Regulating Station


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Service Regulators


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Regulator Selection

Information required to select a regulator:

Maximum and Minimum inlet pressureRequired outlet pressureMaximum flow rate

Tolerance on outlet pressureSize of pipeworkType of gasSafety features requiredSize of orificeOPSS, UPSS & Relief settings

Installation indoors of outdoorsOrientation of regulator


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Gas Meters

The most common types of meters used are:

Diaphragm

Rotary Positive Displacement (RPD)Turbine


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Diaphragm Gas Meters (Commercial)

Tech Spec: EN 1359Capacity: 10, 25, 40, 65 scmhRangeability or Turn Down ratio

(ratio of Q max and Q min ): 1:150 orbetterNominal working Pressure: 100mbar (g)Pressure rating : Suitable towithstand maximum workingpressure of 200 mbar (g)


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Rotary Positive Displacement (RPD)meters


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Advantages Disadvantages

Good flow turndown Filtration essential (50 microns orfiner)

Tolerance to installation effectsand load behaviour

Requires lubrication

Accuracy 1% Physical size at large capacities

Much smaller than a diaphragmmeter

Can create pressure fluctuationson on/off loads

Very long life Can cut off gas supply when it fails

Expensive

Rotary Positive Displacement (RPD)meters


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IMS are used to measure gas supplied to IndustrialconsumersMain component in IMS is filter, Isolation Valves,

RPD Meters with EVC & Modem, Regulators (If lowpressure requirement) and Non return ValveInlet pressure range 1.5 Barg to 4 BargOutlet pressure As required by customer

Industrial Metering Station (IMS)


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MRS components

Inlet & Outlet isolationvalvesFilter

Pressure regulator witha built in slam shutdeviceRelief valveStrainerFlow Meter (RPD,Turbine, etc.)


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GI ERW Pipes

Tech Spec: IS 1239 (Part 1)Types used: Medium Class and Heavy ClassMaterial: IS 1387Pipes shall be screwed with Taper threads

Threads: Tapered and conforming to BS 21Galvanizing: IS 4736 Coating requirements: Mass of coating is 400 gms / m 2 Test Pressure: 5 MPaPowder Coating:

Powder Material: Pure Polyester Application: Electrostatic spraying (40 90 KV, Manual / Automatic)


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GI Fittings (Malleable Cast Iron)

Tech Spec: IS 1879Material: IS 2108 Grade BM 290Dimensions: IS 1879Threads: IS 554 All Internal & External Threads shall be tapered Chamfer shall have included angle of 90 0 +/- 5 0

for Internal threads & 70 0 +/- 10 0 for externalthreads

Galvanizing: IS 4759 Coating requirements: Mass of coating is 700

gms / m 2.


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Forged Fittings (Wrought SteelIron)

Tech Spec: IS 1239 Part 2Material: IS 1387Dimensions & Tolerances: IS 1239 Part 2Threads: IS 554 All Internal & External Threads shall be tapered Chamfer shall have included angle of 90 0 +/- 5 0 for

Internal threads & 70 0 +/- 10 0 for external threadsGalvanizing: IS 4759

Coating requirements: Mass of coating is 700 gms / m 2.

Brass Valves


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Brass Valves(Meter Control Valves, Riser Isolation Valves &

Appliance Valves)

Tech Spec: EN 331Pipe Nominal Diameter :- to 2 NB. Operating Pressure: 4 bar (g).Operating Temperature: 10 60 0 C.Material: Nickel Plated Forged Brass.Pattern: Full Bore, Quarter Turn Ball Valve.Handle: Suitable Metallic Handle, Lever /Knob / Cap Type with yellow coating(Powder / Plastic) on Surface marked asGAS End connection: Screwed, As per BS EN10226-1, Tapered Threaded, Female


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Meter RegulatorGas flow rate: 2.5 m 3/hNominal Inlet Pressure: 100 mbar (g)Maximum Inlet Pressure: 160 mbar (g)Nominal Outlet pressure: 21 mbar (g)Lock-up pressure: Shall not exceed 30 mbar (g)Low pressure Cut-Off: at inlet pressure of 11.5 mbar to 15 mbar (g). Re-pressurization safety device is fitted which prevents the regulator

from re-opening when the inlet pressure is restored unless there is adownstream backpressure, i.e., all connected appliances have beenturned off.

End connections: Right angled inlet and outlet connections of x BSPT (Female)


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Rubber Hose (flexible and steelwire braided)

Used to connect the appliance, insidethe house of domestic customerTech Spec: Type IV of IS 9573Size: 8 mm NBMaterial: It consists of

A. Lining: Synthetic rubber like NitrileButadiene Rubber (NBR) orChloroprene Rubber (CR)

B. Reinforcement: Wire reinforced inbraided form in between the liningand the cover

C. Cover: Consolidated by wrapping,and uniformly vulcanized to givegood adhesion


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Mechanical Properties: Tensile strength: Minimum 10 MPa for lining and cover Elongation at break: Minimum 200% for lining and 250% for coverSalient features:

Strong (Steel wire reinforced) hence rats can't bite through steelwire Flame resistant Abrasion, ozone and weather resistant, hence no cracks Low temperature flexibility Minimum burst pressure of 0.5 MPa Long life (5 years) Grip strength (to nozzle of appliance)

Rubber Hose (flexible and steelwire braided)


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City Gas Distribution NetworkDesign


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System Basics Data relating to equipment shall use that systemof unit that is most common in the relations withsuppliers.Where advisable for good understanding, thecorresponding value in the other System of Unitsshall be mentioned between brackets.Results of technical calculation and relatedfigures issued from specific software shall remainexpressed in that system of units that is used bythe relevant software.


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Steel Pipelines Steel mains

Notwithstanding the major advantages ofpolyethylene (PE), steel pipelines remain necessaryas follows;

High-Pressure MainsLocation class: the design of High pressure mainsshall consider requirements as for Location Class 4(ASME 31.8) to allow timelessness should the

environment change in the future.Wall thickness: according to ASME B31.8 Section841.11 with Design factor of 0.4. In addition, wallthickness shall, in no way, be lower than the values

below in function of Nominal Diameter (ND)


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Steel Pipelines 4 in. and below - 3.9 mm 6 in. - 4.5 mm 8 in. - 5.0 mm 10 in. - 5.6 mm 20 in. - 6.3 mm

GSPC Gas is using 6.4 MM Wall thickness.Steel Grade: The Design Concept considers APIGrade X 52 Steel quality to offer maximumflexibility for line pipes procurement.Bend Radius: to allow pigging under specialcircumstances


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Steel Pipelines Steel Pipes

API 5 L - Line Pipes ASTM A 106 - Seamless Pipes ASTM A 333 - Seamless & Welded Pipes for low temperatureservices

Location ClassLocation Class I - 10 or fewer buildings in 1 mile sectionLocation Class I I - 10 46 buildings in 1 mile sectionLocation Class III - 46 or more buildings in 1 mile sectionLocation Class IV - Areas where multi story building & heavy

traffic plus other underground utilitiesSteel Pipe Design FormulaeP = (2 St/D) * FET As per ASME B 31.8, 841.11 (a)

t = PD / 20fs


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Steel Pipelines Process Design

Wey-mouth FormulaeQ = 0.0813 * (d) 2.6667 * {(p12-p2 2)1/2 / (S *L)1/2 }

VelocityV = Q / A

Velocity for filtered gas to be 40 m/s &unfiltered gas to be 20 m/s maximum.


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ExampleP 1 = 15 Barg, P2 = 10 Barg (Min .)

Q = 2,00,000 SCMD

L = 32,000 m

1 2


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Q = 2,00,000 SCMD i.e. 9,166.66 SCMH

Using Wey Mouth Formulae: Q = 0.0813 * (d) 2.6667 * {(p12-p2 2)1/2 / (S *L)1/2 }

9166.66 = 0.0816 x (d) 2.6667 * {(16.013 2-10.013 2)1/2 /(S* L) 1/2 }d = 198.52 mm : Calculated Diameter.We have to select diameter from the available range e.g. 200.1 mmfrom API 5 L

Now, P 1V1 = P 2V21.013 * 9,166.66 = (9.32+1.013) * V 2 V2 = 898.8 M 3 / Hr = 0.2497 M 3 / Sec.

Now, for Velocity, Q = A * v0.2497 = (3.14/4) * (200.1 * 10 -3)2 * vV = 7.94 m/s

Now, for Wall Thickness, t = (P*D) / 20fst= (16.013 * 219.1) / (20 * 0.29 * 241)t = 2.5099 mm

Example


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ExampleP 1 = 26 Barg, P2 = 10 Barg (Min .)

o Q = 1 Q = 9250

o L = 12000 m L = 20000

Q = 4000 L = 7000

1 2 3

21


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Polyethylene Pipelines MRS (Minimum Required Strength)

The MRS value represents the long-term circumferentialstress in the pipe under which the break may occur after 50years at the earliest.Stress = MRS / C, where C is overall service coefficient

The minimum value of C for the material to be used for Gasapplication is 2.

MAOP (Max. allowable Operating Pressure)MAOP = (20 * MRS) / [C * (SDR-1)].

Standard Dimension RatioSDR = D n / E n SDR used in GSPC Gas is SDR 9, SDR 11 & SDR 17.6

Standard followed by GSPC GasIS 14885: 2001


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Polyethylene Pipelines Base resin

The PE resins of Third Generation (PE 100 orMRS 10) in full compliance with detailedspecification is being used. First Generation is PE

63, second PE 80 & Third generation is PE 100.Wall thickness

The MDPE network designed and qualified for aMOP of 4 bar.

The Network analysis and resulting structure andbehaviors are based on such design. PE line pipeswall thickness shall be in accordance with thefollowing SDR

Gas mains (ND 90 mm): SDR 17.6Gas mains and Service lines ND 90 mm : SDR 11.


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Different Material used for PE PipesThe following materials have been approved to date:Solvay Eltex TUB 121(Black) or Eltex TUB 125(Orange) PE100Borealis HE 2490 PE 100Fina Finathene XS 10 B PE 100

Dow BG 10050 PE 100Elenac Hostalen CRP 100 PE 100

Codes:Manufacturer Commercial Brand Name

Code(*)SOLVAY ELTEX TUB 121/125 E3BOREALIS HE 2490

N3FINA FINATHENE XS 10 B F3DOW BG 10050

D3

ELENAC HOSTALEN CRP 100 H7

Polyethylene Pipelines


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Process DesignWey-mouth Formulae

Q = 0.11672 * (d) 2.664 * {(p12-p2 2)0.544 / (S * L) 1/2 }

VelocityV = Q / AVelocity for filtered gas to be 40 m/s &unfiltered gas to be 20 m/s.

Being a complex network, requiredspecialized tools for Planning & Designing thenetwork. GSPC Gas use SynerGEE softwarefor designing the PE Network.

Polyethylene Pipelines

PNG Domestic & Commercial


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Process DesignPolyflow Formulae

Q = 1.522786 * 10 -3 * (d) 2.623 * {(h/L)0.541 }

Peak Gas flow is assumed @ 0.5 SCMH forone houseBeing a standard PNG Connection, we havestandardize the design of PNG Network as

follows; GI pipes up to G + 4 apartments OR 5 connections in caseof raw house.1 GI Pipe above 5 th Floor apartment OR above fiveconnections in raw house.

PNG Domestic & CommercialConnection


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Route Selection for GI / Copper Pipe Installation Route selection for GI pipe installation shall be carried out as perthe guideline given below;

Pipe shall not be installed on un-plastered wall or in the house underconstruction.Pipe shall not be installed in an unventilated void space.

Route shall be selected that maximum length of the pipeline shall beinstalled outside.Route of the pipeline shall be planned for the shortest possiblelength.The gas pipeline shall be away (minimum distance of 200mm) fromthe electrical line.There shall be minimum change of directions and minimum no ofthreaded joints.Maximum two Point in the kitchen for gas stove only.Compound gate or doors and windows inside the house shall not hitthe Gas pipeline.Copper installation should be a minimum 300mm away from heatsource and Electrical installations. If it is not possible for copperinstallation then suitable protection should be given.If the copper pipe installation is carried out inside cupboards, there




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Positioning of Valves, Regulator & Meter Riser Isolation Valve:

For apartments, one riser isolation valve shall be provided at a heightof 2 meterFrom the ground and individual meter control valve shall be installed

for each connection.The riser isolation valve shall be installed at a convenient height sothat it is easy to operate the valve in emergency.

Meter Regulator: Regulator shall be installed in such a way that it reduces the length of

H.P. Line (Max. pressure 0.1 Bar) to minimum possible.Wherever possible meter Regulator shall always be installed outsideresidence and at a convenient height.



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Clamping


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GI Pipe cutting & Threading After site and route clearance, the measurements for pipecutting shall be taken and pipes shall be cut accurately as perthe required lengths.If the length of pipes is not correct, the threaded joints comeunder heavy stresses, which may ultimately cause gasleakage.Installed piping threaded connections / joints shall betightened in such a way that all the joints shall be free fromheavy stresses and misalignments due to incorrect pipelength.The condition of thread die and pipe vice jaws shall be

checked regularly and shall be free from defects.Cutting fluids (oils) shall be used while thread cutting.Threaded pipes shall be handled carefully so that the threadedoily portion shall be free from dust, mud, water and anydamage due to impact of any object.

Cutting burrs on the pipe shall be removed from the edges.The ed es shall be strai ht and free from Knife-ed e

G.I. Pipe Installation &


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. . pClamping

Teflon tapes shall be wrapped on threaded portion of the pipewith minimum three overlaps. The Teflon tap should be ofapproved make and gauge.The no of clamps shall be adequate. The pipeline portioncontaining the Regulator and Meter, either horizontal or vertical,shall have clamps on both side of the regulator and meter.

Clamps shall be fitted in such a way that they do not createmisalignment of pipes.The clamp shall be installed by drilling 6 mm hole in plasteredwall and screwed using rowel plug.Distance between two clamps shall not be more than 2 meter;the gap between riser and wall shall be minimum 25 mm.

Clamps shall be installed in a straight line and shall be parallel toeach other.The clamps shall be fixed properly on the walls and should grippipe in position.For wall crossing, drill the hole with the help of electrical drillingmachine in such a way that plaster and tiles shall not bedamaged. It shall be ensured that there is no concealed wiring or

G.I. Pipe Installation &


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pClamping

Self-adhesive anticorrosive tape shall be wrapped on the pipewith 50% overlap.Casing sleeve shall be installed in wall for wall crossing.

Alignment of the pipeline shall be maintained.Whenever compound gate, house door or window hits the G.I.pipe protection clamp shall be installed to protect the pipe.Concealed piping shall not be done.

All the pipes shall run on walls with clamps. Pipe should not beoverhung and shall not be installed without pipe clamp.Wherever powder coating is peeled off during fitting andtightening of the pipe, touch up shall be done after the

installation is completed by two coats of approved paint.Prior to installation all pipes and fittings shall be checkedinternally to ensure that they are free from any obstruction.PE to GI (transition fitting) joint shall be provided above ground.

Installation of Valves Regulator &


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Installation of Valves, Regulator &Meter

Union and testing T shall be installed before riserisolation valve.Meter control valves, Meter regulator and Gas metershall be protected from the over tightening of thethread.

Valves, Meter regulator and Gas meter shall beinstalled with the clamps on both sides. As far aspossible hex nipple shall not be used for connecting.Both side threaded 3 to 8 long pipe nipple shall beused.Gas meter, regulator and installed piping shall bealigned properly.Flow direction of the gas meter shall be checkedbefore installation.Flat rubber washer shall be checked and ensure atinlet and out let of the adaptor joint to the meter.Pi e ni le shall be installed between elbow and


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Technical Training Gspc Gas

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