Valves for the LNG Liquefaction Train
Cools natural gas to roughly -162C for storage and transport as liquid. Every wetted valve below the pre-cooling stage is cryogenic-rated, and thermal-cycling durability governs the whole train.
What are the critical valves in a LNG Liquefaction Train?
Main cryogenic heat exchanger isolation (Ball Valves) — Cryogenic ball valves with extended bonnets isolate the coldest section of the train. LNG storage tank inlet/outlet (Gate Valves) — Cryogenic gate valves for tank filling and send-out. Boil-off gas relief (Safety & Relief Valves) — Cryogenic safety relief valves protect against tank and line overpressure from boil-off.
Critical Valve Points
Main cryogenic heat exchanger isolation
Ball Valves →Cryogenic ball valves with extended bonnets isolate the coldest section of the train.
LNG storage tank inlet/outlet
Gate Valves →Cryogenic gate valves for tank filling and send-out.
Boil-off gas relief
Safety & Relief Valves →Cryogenic safety relief valves protect against tank and line overpressure from boil-off.
Unit-Level Valve Strategy
- Extended-bonnet, cryogenic-rated valves (BS 6364) are mandatory below the pre-cooling stage - standard-bonnet valves cannot maintain stem-packing integrity at cryogenic temperature
- Boil-off gas (BOG) handling requires valves rated for the same cryogenic range even during upset venting
- Thermal-cycling fatigue on start-up/shutdown - far more frequent in LNG service than steady continuous plants - drives seat and bellows life
Equipment in this Unit
Fluids in this Unit
Governing Standards
Related process units
Sealing systems specified in this unit
Connected Engineering
Sourcing valves for a LNG Liquefaction Train?
Send your unit valve list — we supply the full set (Ball Valves, Gate Valves, Safety & Relief Valves) with certification matched to BS 6364, in one PO.