APPLICATION
Compressors for LNG Boil-Off Gas
Cryogenic suction, unforgiving on leakage, and never allowed to stop
Typical BOG duty: methane boil-off from tank pressure (just above atmospheric) at cryogenic temperature, boosted to fuel-gas or re-liquefaction pressure.
A typical duty profile
| Gas | Natural Gas (CH4 mix) |
|---|---|
| Capacity | 800 Nm³/h |
| Suction pressure | 1.05 bar(a) |
| Discharge pressure | 25 bar(a) |
| Suction temperature | -120 °C |
| Oil-free required | Yes |
| ATEX / hazardous area | Yes |
| Contamination | none |
| Duty | continuous |
What the tool says on this profile
The tool's answer on this profile: Diaphragm Compressor (hydraulically actuated), with 1 alternate family in play. Duty as derived by the engine: 800 Nm³/h, 1.1 bar(a) → 25.0 bar(a), overall pressure ratio 23.8.
Computed at build time by the same engine the tool runs — this page and the selector cannot disagree. Your duty differs from the profile? Run your own numbers below.
What to watch
- Suction at −100 °C and below puts the materials file into cryogenic territory — low-temperature toughness, not just pressure rating.
- Natural gas here stands proxy for methane-rich boil-off; actual composition varies with cargo ageing.
- Continuous duty with no tolerance for unplanned stops — redundancy is a station-design question, raise it early.
Related on this site
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