LPG FUEL SYSTEM
LPG Composition
C₃H₈ 60% / C₄H₁₀ 40%
LEL: C₃H₈ 2.1% · C₄H₁₀ 1.8%
Valve Status (per §5.3 MSC.1/Circ.1666)
NON-RETURN VALVES
Pipeline Line-Up / Valve Train
Vaporiser Unit
ONLINE — L→G CONVERSION
Engine Mode
DUAL-FUEL / LPG ACTIVE
Engine Load
71.8 %
P&ID — LPG FUEL SYSTEM (MSC.1/Circ.1666)
FIRE & GAS / AMS
ESD → MFV close + vaporiser trip + engine → diesel
GAS DETECTION — % LEL (C₃H₈ LEL = 2.1%)
SCENARIO / TREND
NORMAL OPERATIONS
LPG fuel system steady state. Pressurised storage ~8 bar. No BOG issue. LPG heavier than air — sinks to bilge.
LPG PROPERTIES / SAFETY
Critical: LPG heavier than air
LPG sinks — accumulates in bilges, pits, enclosed low spaces. Detectors at FLOOR LEVEL.
Detector Positions (per MSC.1/Circ.1666)
Ventilation (min 30 ACH fuel prep)
NORMAL — 30 ACH
PPE Status
SCBA
4/4
Fire suit
4/4