PowerPoint Presentation*
GAS PIPELINES
PIGGING STATION
SV (SECTIONALIZING VALVE) STATION
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CONTENTS OF DESIGN BASIS
GAS COMPOSITION & TYPE : ASSOCIATED GAS , FREE GAS, RLNG, etc.
PIPELINE LENGTH
LOCATION OF CONSUMERS
COMMON DESIGN PRACTICES
MAWP OF 99.93 KG/CM2 G @ 65 0C
DESIGN LIFE DECIDED BY OWNER GENERALLY 25 -30 YEARS
ASME B31.8 & OISD-226 REFERRED FOR GENERAL GUIDANCE
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BASIS OF SIMULATION STUDY
33% EXTRA CAPACITY OVER CONTRACTED VOLUME AS PER PNGRB GUIDELINES TO TAKE CARE OF FUTURE CONSUMPTION / EXPANSION
OPTIMUM NO. OF COMPRESSOR STATIONS DECIDED ON FOLLOWING BASIS:
MINIMUM SUCTION PRESSURE AS 45 KG/CM2 G
DISCHARGE PRESSURE OF 92-99.93 KG/CM2 G
POWER PLANT PRESSURE REQUIREMENT~ 25-30 KG/CM2 G
FERTILIZER PLANT REQUIRE AT 40-45 KG/CM2G
PETROCHEMICAL PLANT REQUIRE AT 50-55KG/CM2G
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BASIS OF SIMULATION STUDY
PRESSURE DROP 0.25 – 0.35 Kg/cm2 PER KM
INTER COMPRESSOR DISTANCE 150 – 250 KM
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SOFTWARE USED
(ENERGY SOLUTION INTERNATIONAL)
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BROAD EQUIPMENT SPECIFICATIONS
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DETAILED EQUIPMENT SPECS.
(FOR OPTIMUM CASE)
DETAILS OF PIPING, SIZING & RATING etc.
INSTRUMENTATION
CONTROLS & INTERLOCKS FOR SAFE ,EFFICIENT & RELIABLE OPERATION OF PIPING SYSTEM
P&ID DEVELOPMENT
UTILITY SUMMARY PREPARED FOR EACH FACILITY
UTILITIES REQUIRED
SERVICE WATER FOR FLUSHING & CLEANING
(INTERMITTENT BASIS)
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UTILITIES FOR COMPRESSOR ARE ESTIMATED FROM DATA BASE OF PREVIOUS PROJECTS.
EQUIPMENT / SPECIFICATION & P&ID DEVELOPED FOR UTILITY SYSTEMS
UTILITY REQUIRED (CONTD.)
FACILITIES
PIGGING STATION
SV STATION
PREPARATION OF DESIGN BASIS DOCUMENT CONTAINING ALL THE DATA FOR DESIGN OF PIPELINE AS PER CLIENTS REQUIREMENT
LIQUID PIPELINES
CONTENTS OF DESIGN BASIS
THROUGHPUT DATA : MMTPA OF LIQUID
LIQUID TYPE : CRUDE OIL, HVP LIQUID LIKE LPG,C2/C3 ,REFINED PETROLEUM PRODUCTS e.g. MS,SKO,HSD,ATF
SPECIFIC GRAVITY,VISCOSITY AT TWO TEMPERATURES
PIPELINE LENGTH
LOCATION OF TAP-OFF POINTS
COMMON DESIGN PRACTICES
MAWP OF 99.93 KG/CM2 G @ 65 0C
DESIGN LIFE DECIDED BY OWNER GENERALLY 25 -30 YEARS
ASME B31.4 & OISD-141 REFERRED FOR GENERAL GUIDANCE
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BASIS OF SIMULATION STUDY
OPTIMUM NO. OF PUMPING STATIONS DECIDED ON FOLLOWING BASIS:
MINIMUM SUCTION PRESSURE AS 4-5 KG/CM2 G
MAXIMUM DISCHARGE PRESSURE OF 90 KG/CM2 G
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BASIS OF SIMULATION STUDY (Contd)
MAINTAIN VELOCITY LIMIT OF 2 m/s
PRESSURE DROP 0.50 Kg/cm2 PER KM
INTER PUMPING DISTANCE ABOUT 200 KM
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SOFTWARE USED
(ENERGY SOLUTION INTERNATIONAL)
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SURGE ANALYSYS
SURGE IN PIPELINE IS PRODUCED DUE TO CHANGE IN VELOSITY OF MOVING STREAM
SURGE ANALYSYS CARRIED OUT FOR FOLLOWING CASES WHICH RESULT IN CHANGE IN VELOCITY:
CLOSURE OF SECTIONALIZING VALVE ON MAINLINE
CLOSURE OF INLET VALVE OF STORAGE TANK
STOPPAGE OF PUMPS AT ORIGINATING /INTERMEDIATE STATION
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BROAD EQUIPMENT SPECIFICATIONS
PIPELINE:SIZE, LENGTH, MATERIAL OF CONSTRUCTION (MOC), P & T.
PUMPS: DIFF. HEAD, SHUT OFF PRESSURE, RATED FLOW, MOC, SP. GRAVITY OF LIQUID HANDLED, RATED BKW (η = 75%)
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DETAILED EQUIPMENT SPECS
(FOR OPTIMUM CASE)
BATCH SIZING AND SEQUENCING
ESTIMATION OF INTERFACE VOLUMES USING EQUATION BY AUSTIN AND PALFREY
ESTIMATION OF MINIMUM BATCH VOLUMES TO RESTRICT CONTAMINATION WITHIN PERMISSIBLE LEVELS (1% SKO IN MS AND 2% SKO IN HSD)
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TECHNICAL IMPROVEMENTS
REDUCTION IN FRICTION LOSSES,PROJECT COST AND OPERATIONAL COST
VFD MACHINES
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