40-a-00008_e_tech spec gas module1.pdf

8/9/2019 40-A-00008_E_Tech spec GAS MODULE1.pdf

1/17

DOC. ID: 40-A-00008 REV/STATUS: E / Approved

DATE: 17 Dec 2013 MADE/APPROVED: SIVAKOMA / TUUKAHON

PAGE: 1(17)

NAME: Technical Specification

SUBJECT: Gas Receiving, Metering & ESD module

CUST. DOC. ID:

CITEC OY ABP.O. Box 109, FI-65101 VAASA, FINLAND, Tel. +358 6 3240 700 Fax +358 6 3240 850

www.citec.com

FUEL GAS RECEIVING,

METERING & ESD

MODULE

(GAS MODULE 1)

TECHNICAL SPECIFICATION

Revision history

Revision Made by Approved by Reason for revision

ARamaswamyNeelakantan

Jonas Nylund Original revision

BRamaswamyNeelakantan

Tuukka Ahonen Gas Filters added

C SivakumarKomarasamy

Tuukka Ahonen Updated gas fuelcomposition. Materialrequirements updated.

D RamaswamyNeelakantan

Jonas Nylund Module ArrangmentChanged

E SivakumarKomarasamy

Tuukka Ahonen Gas flowrate updation andESD location changed


2/17

DOC. ID: 40-A-00008

DATE: 17 Dec 2013

PAGE: 2(17)

TABLE OF CONTENTS

1. DESIGN BASIS .......................................................................................................... 32. CODES AND STANDARDS ...................................................................................... 53. DESIGN INPUTS ....................................................................................................... 64. SYSTEM DESCRIPTION .......................................................................................... 75. SCOPE OF WORK ...................................................................................................... 96. TECHNICAL SPECIFICATIONS ............................................................................ 127. TERMINAL POINTS ................................................................................................ 13

8.

DATASHEET ............................................................................................................. 15


3/17

DOC. ID: 40-A-00008

DATE: 17 Dec 2013

PAGE: 3(17)

1. DESIGN BASIS

FUEL GAS ANALYSIS - NATURAL GAS

Natural gas will be used as preliminary fuel and Jet A1 fuel is used as back up fuel.

Components Volume % Weight% Mol. Wt g/Mol

C1(Methane) 97.83 94.98 16.04C2(Ethane) 1.22 2.22 30.07C3(Propane) 0.01 0.03 44.10i-C4(i-Butane) 0.07 0.21 58.12n-C4(n-Butane) 0.07 0.24 58.12

i-C5(i-Pentane) 0.02 0.09 72.15n-C5(n-Pentane) 0.01 0.04 72.15C6+ (Hexane +) 0.01 0.05 84.0Mcyclo-C5 0.00 0.02 84.16Benzene 0.00 0.00 78.11Cyclo C6 0.00 0.01 84.16C7Heptane 0.072 0.43 96.0McycloC6 0.00 0.01 98.19Toluene 0.00 0.00 92.14C8 0.0078 0.05 107.00C2-Benzene 0.00 0.00 106.17mp-Xylene 0.00 0.00 106.17O-Xylene 0.00 0.00 106.17C9 0.00 0.01 121.0C10 0.00 0.00 134.0C11 0.00 0.00 147.0C12 0.00 0.00 161.0C13 0.00 0.00 175.0C14 0.00 0.00 190.0C15 0.00 0.00 206.0H2O 0.0006 0.00 18

Nitrogen 0.20 0.34 28.01CO2 0.26 0.68 44.01H2S ( Refer Note) 0.00 0.00 34.08C7+ 0.01 0.09 102.7C12+ 0.00 0.00 210.0Total 100% 100%


4/17

DOC. ID: 40-A-00008

DATE: 17 Dec 2013

PAGE: 4(17)

For design, 5% on composition is considered. Fuel gas temperature will be vary depends on ambient

conditions from 15C to 38C.

Design ambient temperature for gas system 26C

Min. Ambient temperature for gas system 14CMax. Ambient temperature for gas system 38C

GENERAL FUEL GAS PROPERTIES

Description Unit Value

Molecular weight g/Mol 16.53Molar Density Kg mole/m3 4.503Mass Density Kg/m3 74.41Mass heat capacity kJ/kg C 2.947

Specific heat kJ/kg mole C 48.70Thermal conductivity W/m K 4.305E-002Viscosity cP 1.400E-002HC dew point C -27.07

Note: The above given general fuel gas property is based on 23.71C and 92 bar pressure.

For all basic information about project, site details and requirements, please refer to

the general specifications that are attached (Doc Id: 40-0000520).

Components Unit Values

Specific Gravity 0.567C7+ Density g/cc 0.750C12+ Density g/cc 0.834Dry Gross Cal. Value BTU/SCF 1022.0Wet Gross Cal. Value BTU/SCF 1004.0Water dew point C -25@90bar


5/17

DOC. ID: 40-A-00008

DATE: 17 Dec 2013

PAGE: 5(17)

2.

CODES AND STANDARDS

The module components shall comply with the latest editions of relevant standardsissued by EN standards unless otherwise specified. Here some of them mentioned,but this is not an exhaustive/full list:

PED 97/23/EC The European Pressure Equipment Directive

EN 1776 Requirements for the design, construction, commissioning,operation and maintenance of new gas measuring stations

EN 12186 Gas supply systems, gas pressure regulating stations fortransmission and distribution. Functional requirements

EN 1594:2009 Gas supply systems. Pipelines for maximum operating pressureover 16 bar. Functional requirements.

EN 14382 Safety devices for gas pressure regulating stations andinstallations. Gas safety shut-off devices for operating pressureup to 100 bar

EN 12732:2000 Gas supply systems. Welding steel pipework. Functional

requirements

EN 10204:2004 Metallic materials. Types of inspection documents

EN 10208-2:2009 Steel pipes for pipelines for combustible fluids. Technicaldelivery conditions. Pipes of requirement class B

EN 12068:1999 Cathodic protection. External organic coatings for the corrosionprotection of buried or immersed steel pipelines used inconjunction with cathodic protection. Tapes and shrinkablematerials

EN 12327:2000 Gas supply systems. Pressure testing, commissioning anddecommissioning procedures. Functional requirements

EN 12954:2001 Cathodic protection of buried or immersed metallic structures.General principles and application for pipelines

EN 13445:2009 Unfired pressure vessels.

EN 13480 Metallic industrial piping

EN 14141:2003 Valves for natural gas transportation in pipelines. Performancerequirements and tests
http://shop.bsigroup.com/en/ProductDetail/?pid=000000000030003462http://shop.bsigroup.com/en/ProductDetail/?pid=000000000030027046http://shop.bsigroup.com/en/ProductDetail/?pid=000000000030182458http://shop.bsigroup.com/en/ProductDetail/?pid=000000000019976930http://shop.bsigroup.com/en/ProductDetail/?pid=000000000019970280http://shop.bsigroup.com/en/ProductDetail/?pid=000000000030031573http://shop.bsigroup.com/en/ProductDetail/?pid=000000000030250027http://shop.bsigroup.com/en/ProductDetail/?pid=000000000030049308http://shop.bsigroup.com/en/ProductDetail/?pid=000000000030049308http://shop.bsigroup.com/en/ProductDetail/?pid=000000000030250027http://shop.bsigroup.com/en/ProductDetail/?pid=000000000030031573http://shop.bsigroup.com/en/ProductDetail/?pid=000000000019970280http://shop.bsigroup.com/en/ProductDetail/?pid=000000000019976930http://shop.bsigroup.com/en/ProductDetail/?pid=000000000030182458http://shop.bsigroup.com/en/ProductDetail/?pid=000000000030027046http://shop.bsigroup.com/en/ProductDetail/?pid=000000000030003462


6/17

DOC. ID: 40-A-00008

DATE: 17 Dec 2013

PAGE: 6(17)

EN 15001-1:2009 Gas infrastructure. Gas installation pipework with an operatingpressure greater than 0,5 bar for industrial installations andgreater than 5 bar for industrial and non-industrial installations.Detailed functional requirements for design, materials,construction, inspection and testing

3.

DESIGN INPUTS

Fuel gas supply pressure & temperature at Gas Receiving & Metering module inlet batterylimit

PressureNormal Fuel gas supply pressure = 54 Bar (g)Mechanical Design pressure = 86 Bar (g)

TemperatureMinimum Fuel gas supply temperature = 15 CNormal Fuel gas supply temperature = 25 CMaximum temperature = 38 CMechanical Design temperature = 50 C

Flow

Minimum * = [GE to specify later, will be from zero] kg/hr x 1 GT runningNormal ** = 7904 kg/hr x 4 GT = 31616 kg/hr (GT at base load & Chiller ON)

OR

Maximum = 10272.73 kg/hr x 4 GT = 41090.92 kg/hr

* GT at ambient temperature of 35 C, GT at base load & Chiller Off** GT at ambient temperature of 15 C, GT at base load & Chiller ON (463 kBtu/hr)

For all information about mechanical design values and conditions, please refer to

the general specifications that are attached (Doc Id: 40-0000520).

Design shall be according to EN codes & Standards.

E
http://shop.bsigroup.com/en/ProductDetail/?pid=000000000030116798http://shop.bsigroup.com/en/ProductDetail/?pid=000000000030116798


7/17

DOC. ID: 40-A-00008

DATE: 17 Dec 2013

PAGE: 7(17)

4. SYSTEM DESCRIPTION

The Fuel Gas System for the plant conveys natural gas from the terminal point of plantnormally at 54 Bar (g) & operating temperature of 15-38 C at proper conditions, aboveground to the Gas turbine unit. Maximum supply pressure will be 86bar(g).

The gas fuel supply system consists of following modules common for 4 Gas turbines:

#1 Gas Receiving & Metering with ESD Modules (2 X 75%)

2 x 75 % filters (for liquid drops and particles removal),

2 x 75 % flow meters, 2 x 75 % Emergency shutdown valves Online provision for 2 Gas chromatographs in each stream 1 x 100 % Condensate Drain Tank

For normal and emergency operation / condition one (2x75%) solenoid operated quick actingtype Emergency Shutdown valve (ESD) is provided for supply and isolation of Fuel gas. ESDvalve shall be single or double solenoid operated pneumatic on-off valve. Flow meter (2x75%)provided for invoicing measuring purpose. Drains from the modules are directly led to thecommon plant fuel gas condensate drain tank (1 x100%).The module is provided with Onlineprovision for connecting Gas chromatographs. Drains from the modules are directly led to

the common plant fuel gas condensate drain tank (1 x100%).

#2 Gas conditioning Module (1 X 100%)

1 x 100 % indirect gas fired water bath heater with gas burner & Chimney

Fuel gas Scrubber/filter for burners

The fuel gas from the Gas Receiving & Metering with ESD Modules will be directed to 1 x100% indirect water bath heater with gas burner.

Indirect bath gas heater (1 x100%) is provided to compensate the temperature drop due tothe heat loss to the ambient from the pipeline and to increase/control the Fuel gastemperature required by the Gas Turbine. Fuel gas heating is done to a temperature of 70Deg.C.

#3 Pressure Control Module (2 x 100% + 1 x 30%)

Two (2x100%) main Pressure reduction and control valves and one (1x30%) start up controlvalve are located at the downstream of indirect gas fired water bath heater to meet the flowrange of gas requirement of One (1) Gas Turbine start up to Four (4) Gas Turbines on full

load operation.


8/17

DOC. ID: 40-A-00008

DATE: 17 Dec 2013

PAGE: 8(17)

The shut off valves shall be provided with open/close limit switches and the PRVs are

provided with position feedback for monitoring the status of the valves in LCP (local controlpanel) and provisionally DCS.

Regarding all modules

A pipeline vent connection will be provided near gas turbine inlet to vent out entrappedgases during cold start-up of the plant to vent stack. Module vendor to provide equipmentand pipeline vent connections at module border. Normally, for all equipment, one vent linewill contain manually operated ball valves for initial purging. All vents on natural gas linesshall be connected to vent stack. The pressure safety system shall be ensured by providingsuitable pressure safety valves and the system vents will be connected to vent stack (ventstack excluded from module scope).

Natural Gas lines shall be carbon steel piping.

Vendor is responsible for the module engineering. Customer has the right to review andrequire changes to the vendor engineering documents. Vendor is allowed optionally topropose gas fuel supply system in a different amount of modules. I.e. the total system can bedivided into modules in a different way than presented here and there can be fewer modulesthan presented here. However the functionality & performance must fulfil the requirementsin these specifications.

The fuel gas modules shall be designed for outdoor installation and shall be suitably sized to

meet the fuel gas requirement of 4 gas turbines for the site design conditions and the purityof gas as per gas turbine manufacturers requirement / specification.

This specification covers the scope of work for Fuel gas receiving, metering, ESD Module (GasModule 1)

TANESCO JEL 100% JEL GE

100%

30%

BATH HEATER PCV

PCV

PCV

ESD

ESD

FILTER

FILTER

FLOW METER

FLOW METER

PROCESS FLOW SKETCH - FUEL GAS

E


9/17

DOC. ID: 40-A-00008

DATE: 17 Dec 2013

PAGE: 9(17)

5. SCOPE OF WORK

The scope of supply of the vendor under this specification and associated data sheetis intended to cover design, engineering, manufacture, assembly, testing and supplyof the skid with all accessories, site installation supervision, commissioningsupervision, performance guarantee testing, operator training and training materialand handing over of items related to 2 x 75% Gas Module 1 as defined in Scope ofwork, Technical Specification or elsewhere in this specification.

All supplied materials/equipment shall be new and unused. The vendor shall acceptfull responsibility for his work including documentation, manufacture, preparationfor shipment, inspection, warranty provisions, compliance with the applicable codesand standards and the requirements of this Specification. The scope of supply and

services shall include all necessary work and supply of equipment and materialwhether mentioned in these specifications or not, but which are necessary for thesatisfactory, reliable and safe operation and maintenance of the plant and requiredfor achieving guaranteed performance of the plant. Any equipment, device ormaterial even if not included in the original bid but found necessary for the safe andsatisfactory functioning of the units under the bid shall be supplied by the vendor atno extra cost. The module should be delivered in a properly packed condition asspecified here in under but not limited to:

Gas Module #1 is comprised of 2 x75% Stream. The skid details proposed in thisspecification and P&ID (Doc No 40-0000809) are indicative only. Vendor can also

suggest better system than specified. Complete gas Module #1 shall be designed tomeet the main fuel requirements of 4 Gas turbines and comprises of:

Inlet manual isolation station according to double block & bleed arrangement

2 x 75% Solenoid assisted (with single or double solenoid coils) pneumaticallyoperated emergency shutdown (ESD) valve Class VI leakage class (fire safe).Vendor can also consider also motor operated (not primary option).

2x75% filters to remove foreign particles & liquids. Filters shall be equippedwith automatic drain arrangement and pressure difference measurement and

alarm. The natural gas shall pass filter tubes and elements that capture solidparticles and cause liquids to coalesce into larger droplets, which are thencaptured by the wire mesh or vane mist extractor.

2 x 75% fuel gas meters shall be of EN approved type for invoicing purposes,with flow transmitters connected to DCS and with totaliser(s). The metershall be able to measure the flow rate from (0) zero to design flow at therequired accuracy for invoicing purposes.

Standard instrumentation and valves for the safe and efficient operation ofthe module mounted equipment


10/17

DOC. ID: 40-A-00008

DATE: 17 Dec 2013

PAGE: 10(17)

Connection for two online Gas chromatograph(s) for each streams and as an

option two gas chromatographs. The chromatograph kits, complete in allrespects, (including calibration gas etc) shall be able to measure for exampleH2S, specific gravity and gas composition. (Prices for these optional gaschromatographs to be given separately.)

One (1) above ground horizontal fuel gas condensate drain tank, for collectingdrains from all the modules. Drain tank shall be complete with vent withflame arrestor & instrumentation and other accessories as required. The draintank shall be also provided with a condensate trap arrangement, levelindication & alarm to local panel and DCS. Manual condensate dra in pump tobe provided on drain tank for the final disposal of hydrocarbon condensate.The pump shall be mounted on the top of tank or side mounted suitable forthis application. The discharge of pump will be connected to truck throughhose connection which is to be terminated at module battery limit. Vendorshall note that due to drain tank shall be above ground the other units mayhave to be on elevated level in order to ensure gravity draining to tank.

Only one external nitrogen connection for each module will be provided to thevendor. Vendor to tap off as per module requirements from externalconnection.

Nitrogen purging line with check valve and double isolating manual ball valveto be provided inside the skid area to purge the pipeline & skid equipment,

before charging with fuel gas and also to purge the entrapped gas in pipeline& skid equipment while taking-up maintenance jobs/long shutdown.

Internal nitrogen purging connections & internal piping inside the module asrequired based on the system design shall be taken care by the vendor (onlyone external connection is allowed). Bidder shall provide requisite number oftapings for nitrogen purging as the standard practices, the number indicatedin the P&ID attached shall be treated as minimum

Drain lines with double isolation valve

Two numbers of portable gas detectors (totally 2 numbers for all three gasmodules together) of the flame ionization metering type, capable of detectingfuel gas in concentration of one part per million. All necessary detectoraccessories shall be included.

Manual depressurisation line with double isolation valves to be providedaccordingly inside the module wherever needed.

Relief valves to be provided accordingly inside the module.

All the vents / drains to be connected to a common header & terminated at

module terminal


11/17

DOC. ID: 40-A-00008

DATE: 17 Dec 2013

PAGE: 11(17)

All piping, valves and accessories as required to complete the system

All equipment, C&I devices shall be suitable for E Ex _ II A T1 for Naturalgas systems (normally T class, however, T3 or higher T4, is ok). Ex classnormally E Ex d. Instruments normally other type depending on the zone andif barriers are used or not.

Modules/skids for Natural gas are located at Ex zone 2.

All interconnecting piping, valves, specialities, supports within Modulemounted equipment as shown in the P&ID as minimum. It is Suppliersresponsibility to provide all piping components as necessary for the safeoperation of the system

Instrumentation & control system including instruments, interlocking &protection devices complete in all respects required for safe, efficient andreliable operation of the system as per P&ID (Doc No 40-0000809).

All foundation bolts/anchor bolts, insert plates, pipe sleeves, embedment, etcrequired for any equipment/ foundation/ concrete under the package.(Foundations are excluded from scope.)

Local control station/Local Push Button Station (Flame proof) shall beprovided for each skid to enable complete operation of skid. Module1# and

module 3# shall have a common Local control station

All instrumentation valves shall have double isolation valves.

It shall be possible to provide all analogue and digital signals to plant DCS.

All required documentation from vendor is presented in attachedRequirements for Documentation , doc nr 40-A-00175.

E


12/17


13/17

DOC. ID: 40-A-00008

DATE: 17 Dec 2013

PAGE: 13(17)

7.

TERMINAL POINTS

S.NO DESCRIPTION SCOPE

A. MECHANICAL

1. Fuel Gas

Inlet of the Module terminal withcounter flanges

Outlet of the Module terminal withcounter flanges

2. Drains

All drains connected to a commonheader & terminated at Outlet ofModule with counter flange/stubconnection.

3. Vents

Gas vents / safety valve dischargeto be connected individually to acommon header. The header to be

terminated at the module terminalpoint.

4. Nitrogen Connection at module terminal

5. Instrument air7 barg, dryness +3 deg C(flange connection at moduleterminal)

B. ELECTRICAL

1. Earthing Two earthing terminals atdiagonally opposite locations of theskid

Notes

1. Flange connections shall be provided with its counter flange, bolts, nuts andgaskets.


14/17

DOC. ID: 40-A-00008

DATE: 17 Dec 2013

PAGE: 14(17)

Exclusions

1.Foundations of Gas Receiving, Metering & ESD Module2.Civil construction work like building, equipment foundation etc3.Erection of Module and its accessories4.Fire fighting system5.Nitrogen piping up to supply point in module6.Instrument piping up to supply point in module7.Supply of Cables from local JB to Control room


15/17

DOC. ID: 40-A-00008

DATE: 17 Dec 2013

PAGE: 15(17)

8. DATASHEET

The given below datasheet to be filled in by the Vendor .

S.NO PARTICULARS UNIT VALUES

1.0 General

Design Standard

Module

Equipment shall be designed forseismic loads

Fuel Gas Supply Conditions

Gas Flow at inlet of Module

Gas Supply Pressure at inlet ofmoduleGas Supply Temperature at inletof module

2.0 Design & Performance Requirement

General

Maximum Gas Velocity insidepipeline under maximum operatingconditions

M/SEC

20 unfiltered35 filtered

Gas Pressure at outlet of Module

Gas Temperature at outlet of Module

Max. Pressure drop across the

ModuleGas Design Pressure

Gas Design Temperature

Filter

Type

Quantity Nos. 2 X 75%

Design gas flow

Mesh Size

E


16/17

DOC. ID: 40-A-00008

DATE: 17 Dec 2013

PAGE: 16(17)

Particle Size Removal

Pressure Drop at design flow bar

Emergency shut-down Valve

Type of valve Ball

Type of operation

Actuator

Quantity 2 X 75%

Leakage class

Operation time (fully open-close) sec

Material (Body/trim)

Size

PN-class

Fuel Gas Condensate Drain Tank

Type Horizontal

Quantity One (1)x100%

Capacity*(3 m3) or vary

accorindgly* The drain tank capacity indicated is for guideline only. It is Biddersresponsibility to size the drain tank based on his engineering andexperience. Drain tank evacuation cycle shall be once in 14 days ormore seldom. Drain tank discharge pump shall be capable of emptyingthe tank into a truck in one hour

3.0 Safety valves

Quantity

Capacity

Type

Set point Bar(g)

Leakage class

Size DNin/DNout

PN-class PN

Materials

3.0 Isolation valves


17/17

DOC. ID: 40-A-00008

DATE: 17 Dec 2013

PAGE: 17(17)

Quantity

Capacity

Type

Leakage class

Size DN

PN-class PN

Material (Body/Trim)

4.0 Instruments

Type

Make

Model

Range

Accuracy / Accuracy class

5.0 External signals

Name

Type

6.0 Material of Construction

Gas Pipes

Other valves (Body/Trim)

Flanges

Bolts

Nuts

Note : Vendor to Submit complete details of all items (if additional from this

data sheet) as suitable required for this Skid

40-a-00008_e_tech spec gas module1.pdf

Documents