RECIPROCATING COMPRESSORS(PROCESS GAS)

IHI LNG BOG Compressor design point is set to ultra-low temperatures (in the vicinity of -160 degC/-256degF). However, during start-up of a compressor, suction gas can warm up to ambient temperatures due to gas which stagnates in piping etc..
Considering the above, start-up method is particularly of great significance for LNG BOG compressors. Instead of the conventional start-up method, such as cool-down operation with by-pass line or blow-off operation, we recommend the following options.

 

QUICK START-UP (IHI STANDARD)

• Pressurized gas is sent out immediately.
• Suction desuperheater and Suction K.O Drum are required. Recycle line is not required.
• Approx. 15 minutes of 100% load operation is required until suction gas temperature is cooled down to change capacity step.

 

 

ADVANCED QUICK START-UP SYSTEM (SPECIAL OPTION)

• Pressurized gas is sent out immediately.
• Suction desuperheater and recycle line are not required.
• Compressor can start up in any capacity step without upper limitation of gas temperature practically.

  *NOTE: Both water and air is applicable for cooling medium.
  KO drum is recommended if a large amount of mist comes from LNG carrier or elsewhere.