Main Compressor: The main process refrigeration compressor is an Elliot model 38M6-5 rated for 11,584 CFM while turning at 5,960 rpm. It compresses the process gases from atmospheric to 115 psig. It has a Koppers coupling on both the low and high side of the GE model S225AJ gearbox, which has a ratio of 1 : 5.2903. The drive motor is a 4,500-hp GE unit turning at 1,200 rpm and feed with 4,000 volts, 554 amps, 3-phase, and 60 Hz power. It also has an exciter.
Vapor Recovery Compressor: The vapor recovery compressor is a two-stage Ingersoll-Rand model HSE-2-NL-2 reciprocating unit with a 100-hp drive motor. It pumps 4,000 lbs/hr (1,570 CFM first stage and 331 CFM second stage) of process vapors from 1.5 psig to 53.8 psig while turning at 459 rpm.
Process Compressor (unused): There is an unused process compressor that is an Elliot model 38M4-Z rated for 7,218 CFM (8,369 lbs/min of process gases) while spinning at 6,700 rpm. It compresses the process gases from 128.1 psia to 344 psia. The drive motor is a 5,500-hp Westinghouse unit turning at 1,800 rpm and fed with 4,000 volts. The gearbox is a Western unit (1800 rpm in and 6700 rpm out).
Hydrogen Compressor: The hydrogen compressor in the hydrotreating unit is a Norwalk model TDR-S one-stage reciprocating unit rated for 1,722 SCFM (8,790 lbs/hr). It compresses hydrogen from 146 psig to 332 psig with a 9-1/2” bore and 12” stroke. It turns at 240 rpm and has a 250-hp Siemens drive motor.