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what is the purpose of a boil off gas compressor?

Dec 05, 2025

by: Anhui Zhonghong Shengxin Energy Equipment Co.,Ltd.

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What is the purpose of a boil off gas compressor?


Ever wondered how LNG (Liquefied Natural Gas) is stored and transported safely? It's a tricky process. LNG is super-cold. But it can't stay that cold forever.

Heat sneaks in. This causes some LNG to evaporate. This evaporated gas is called boil off gas (BOG).

So, what do you do with this gas? You can't just let it escape. That's wasteful and unsafe. This is where a boil off gas compressor comes in. It's the key piece of equipment that handles this exact problem.
 

Why You Need a Boil Off Gas Compressor


Think of a boil off gas compressor as the heart of the BOG management system. Its main job is to keep things safe and efficient.


Here’s what it does:

  Prevents Tank Pressure Build-Up: As BOG forms, it increases pressure inside the storage tank. The bog compressor sucks in this gas. This keeps the pressure at a safe level. No explosions. No venting.

Recovers Valuable Fuel: Instead of wasting the gas, the compressor recycles it. It compresses the BOG so it can be used as fuel for the ship's engine or re-liquefied. This saves money and energy.

Protects the Environment: By capturing the BOG, these compressors stop methane from being released into the atmosphere. Methane is a powerful greenhouse gas. So, a good lng boil off gas compressor is also a green solution.
 

Where Are Bog Compressors Used?


You'll find bog compressor units hard at work in many places:

*   LNG Import and Export Terminals
*   LNG Carrier Ships and Tankers
*   LNG Storage Facilities

Basically, anywhere LNG is stored or moved, you'll need a reliable system to manage boil off gas.
 

Need a Reliable Solution?


Managing boil off gas is critical. You need equipment that is tough, efficient, and built to last. You need a compressor designed for this specific job.

For top-tier bog compressor solutions, check out the experts at AZS Compressor. They specialize in bog boil off gas recovery and boosting compressors. Their systems are engineered for maximum reliability and efficiency.

>> Click here to see their specialized BOG Compressor solutions!

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