Optimized Joule-Thomson Control Valves are Critical for LNG Operations

Youngdahl, R., Emerson

Liquified gas applications typically require high pressure and cryogenic temperatures to achieve gas separation and liquification. These processes invariably require significant amounts of energy, so the efficiency of these unit operations drives plant economics. Therefore, proper equipment specification and high performance are a prerequisite for profitable operation. The main cryogenic heat exchanger (MCHE) is considered the heart of the LNG facility, making the closely-coupled Joule-Thomson (J-T) control valves feeding the MCHE the most critical of control valves. When these valves are specified and engineered correctly, licensed process controllers can optimize operations, resulting in


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