SAFETY IN LNG
REGASIFICATION TERMINAL
AND TRANSPORTATION
PETRONET LNG LIMITED
INTRODUCTION
The 10 MMTPA LNG Terminal at Dahej, is state of art technological
infrastructure and plays a crucial role in fulfilling the energy
requirement of the country.
16~18% of Indian gas demand is met by PLLs Dahej terminal.
Terminal is equipped with 2.4 Km long Jetty, which can handle
upto 160 ship berthing in a year.
The terminal is operated round the clock, maintaining required
Natural gas flowrate to meet the customers requirement.
INTRODUCTION cont
To maintain almost Zero downtime timely preventive maintenance
activities are carried out on the installed equipments.
The operating and safety procedure are constantly reviewed and
modified as per requirement and operating experience.
The
highly experienced and dedicated operating and
maintenance team is self sufficient to cater any operational or
maintenance related problems.
Process Flow diagram of LNG Terminal, Dahej
AIR HEATER
Metering
STV
FUEL
GAS
GW PUMP
SCV
STV
HW / GW
EXCHANGER
WATER PUMP
FOR
BACKUP
BLOWER
BOG COMP.
UNLOADING/ VAPOR
RETURN ARMS
LP
PUMP
SHIP
LNG TANK
R
E
C
O
N
D
E
N
S
O
R
HP
PUMP
GTG
MAJOR ACTIVITIES IN REGASIFICATION TERMINAL
Unloading LNG from ship
Storage of LNG in tanks
Regasification of LNG
Custody transfer of NG
Loading LNG in Road Tankers
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SHIP MANEUVERING
Tug
Boat
Tug
Boat
FACILITIES FOR SHIP BERTHING
CONSTANT TENSION MOORING WINCH
SHIP DOCKING ASSISTANCE
LNG UNLOADING
LNG UNLOADING
LNG STORAGE TANKS
10
LNG STORAGE TANK
Capacity :1,48,000 m3
Outer Dia. : 81 m
Height
: 55 m
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LNG HP PUMPS
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LNG VAPORIZERS
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LNG TANKER LOADING FACILITY
14
LNG FACILITY AT CUSTOMERS END
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HAZARDS OF LNG
Cryogenic Temperature
Severe frost injury to human on direct contact
Brittle Failure of Non cryogenic material
Rapid Phase Transition on contact with Water
Incase of leak, formation of visible flammable
white cloud causes Dispersion hazard
Asphyxia: Prolonged exposure to natural gas
environment can result in decrease in amount of
oxygen in the blood causing unconsciousness
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SAFETY IN HANDLING LNG
Design Control: Proper selection of material of
construction for storage and handling of cryogenic
liquids.
Suitable materials for cryogenic liquids are Aluminum,
9%-Ni Steel, Invar(36%-Ni Steel), SS316,SS304L
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SAFETY IN HANDLING LNG
Engineering control: Proper isolation and inerting
provision to be made during design and engineering.
Double block and bleed arrangement and adequate
Pressure relief devices to be installed.
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SAFETY IN HANDLING LNG
Administrative Control: Use Proper Personal
Protective equipments for handling cryogenic
liquids and flammable gases
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SAFETY IN HANDLING LNG
Safety Instrumented System (SIS):Dedicated
Process Control and Emergency Shutdown Systems
(ESD)are provided. These systems monitors the realtime operational conditions, provides alarms in case
of deviation and finally safe shutdown of the system.
DCS (Distributed Control System)
ESD ( Emergency shutdown system)
FGS (Fire, gas and spill detection system)
ULA (Unloading Arm system)
BAS (Berth Aid System)
TFMS (Tank farm management system)
Gas Metering System
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SAFETY IN HANDLING LNG
Administrative Control: Impart proper and
regular training to the personnel
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SAFETY IN HANDLING LNG
Administrative Control:
Standard Operating Procedure
Field Round
Patrolling Sheet ( Engineer & Operator )
Work Permit System
Fluid Lock Out system
Bypass procedure
Performance Management System
Abnormalities Identification and Reporting System
Internal/External audits
Health Monitoring
Communication Procedure
Incident analysis
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FIRE FIGHTING SYSTEMS
Fire ,Gas and Spill(FGS)detection system
Deluge valves and water curtains
Inergen and CO2 flooding systems for building
Fire Water system
Fire extinguishers like DCP(Dry Chemical
powder),Foam generators.
Fire Tenders
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FIRE FIGHTING SYSTEMS
WATER CURTAIN DURING LNG UNLOADING
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