Patent ID: 6141973
Filing Date: 2000-11-07
Classification: F25B

Abstract:
In a pressurized gas pipeline, an apparatus for cooling gas flow, said apparatus comprising:a main pipeline remote from and between compressor stations;a bypass pipeline communicating with said main pipeline, said bypass pipeline withdrawing gas from and reinserting gas into the main pipeline; andmeans for lowering the temperature of the gas in the bypass pipeline from a first predetermined temperature to a second predetermined temperature;said means for lowering the temperature comprising at least one Joule-Thomson expansion valve disposed at a predetermined location in the bypass pipeline, for decreasing the pressure of the gas at the predetermined location from an entry gas higher first pressure upstream of said valve to an exit gas lower second pressure downstream of said valve, and correspondingly decreasing the temperature of the gas at the predetermined location from an entry gas predetermined higher first temperature upstream of said valve to an exit gas predetermined lower second temperature downstream of said valve.