May 2013

Special Report: Maintenance/Reliability

Investigate power limitations in a large steam turbine

An investigation was carried out to rectify power limitations for a steam-turbine driver of a cracked-gas compressor (CGC) in a world-class ethylene plant.DescriptionThe turbine is a nine-stage, impul..

Ghaisas, N., Fluor Canada Ltd.

An investigation was carried out to rectify power limitations for a steam-turbine driver of a cracked-gas compressor (CGC) in a world-class ethylene plant. Description The turbine is a nine-stage, impulse-type, multi-valve, straight-condensing turbine. Five years after the initial start up, the first-stage nozzles of the turbine were replaced with a new set of nozzles supplied by the original equipment manufacturer (OEM). The replacement was done to yield higher power output now required for olefins production. The new nameplate-rated power of the turbine is 54,000 hp at 3,927 rpm. The revamp excluded any modifications to the compressor drive and couplings due to adequate design margins th

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