Here's a summary of a paper presented by Steve Ingistov, PE, BP/WCC and Mustapha Chaker of Bechtel Corporation about the Watson Cogeneration Company (WCC) plant at the ASME/IGTI conference in 2011. The plant was fully commissioned during the first part of 1988, consists of four GE 7EA gas turbines, two Dresser-Rand Steam Turbines and four dualpressure heat recovery steam generators.
Turbomachine design and arrangement is often complex and optimization must be made between the mechanical requirements, electrical specification, auxiliary equipment design, operation, reliability, commercial and maintenance.
Future LNG plants would be "all aero-derivative" driven or "all electric" driven. Practical notes and latest developments on LNG refrigeration compressor train design, driver selection and optimization are discussed. Useful notes and new technologies on "all electric" solution and associated power plant are also described.
A comprehensive torsional analysis should be carried out for a complex compressor string. Various modes of torsional vibrations should be extracted and analyzed. Complicated combinations of effects in various steady state and transient operating cases should be considered. Complete practical notes and latest achievements on torsional design, train arrangement, component selection, coupling sizing and vibration studies are described.
Advanced condition monitoring methods have been used to operate rotating machines reliably and efficiently. Practical notes on availability improvement plans, condition monitoring techniques, predictive maintenance methods, trouble-shooting techniques and smart operation are discussed in the article.
The state-of-the-art compressor for offshore and subsea compression is hermetically sealed direct driven centrifugal unit using magnetic bearing without seal or oil auxiliary systems. This is a simple and small footprint machine with maintenance intervals more than five years.
Specifying coupling and gear units for compressors in high-pressure service
June 17 2011 -
Compressors, drivers and gear units are usually designed and fabricated by different manufacturers. Generally they are selected from pre-designed and pre-engineered models. Their dimensions are fixed and proper supports are required to keep them in same train centre-line.
Centrifugal compressor purchasers and end-users realize the value and payback of accurate and proper shop performance test and shop mechanical run test. Shop test is a necessary step for centrifugal compressor future reliability and trouble free operation. ASME-PTC-10 type 1 performance test should be done wherever possible. Otherwise arrangement and details of ASME-PTC-10 type 2 performance test, as close to specified operating condition as possible, should be fixed before machine order. Three case studies are discussed.