Category Archives for Centrifugal Compressors

Centrifugal Compressors – Horsepower and Efficiency Estimates

One of the major benefits in doing your own estimates, rather than turning everything over to a manufacturer, is that you develop a better understanding of the application. You are then in a better position to discuss it with the … Continue reading

23. June 2019 by Dan
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Centrifugal Compressor Full-load, Full-pressure, Full-speed Test

A full-load, full-pressure, full-speed (FLFPFS) test is often called for when the compressor train is in gas injection service or other services where the discharge pressure exceeds 2000 or 3000 psi. There is no hard-and-fast rule for the pressure level … Continue reading

29. April 2018 by Dan
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Centrifugal Compressor Complete-Unit Test

The complete-unit test is also called a “String” test. It consists of coupling up all the components and auxiliaries of a compressor train, and running them together in a mechanical spin test. This test is strictly mechanical, and can be … Continue reading

29. April 2018 by Dan
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Centrifugal Compressor Class III Tests Performance Test

This test is the same as Class II except that compressibility factors are applied along with changes in “k” value from suction to discharge. In Class II and III tests, the test speed and test pressures and temperatures are often … Continue reading

29. April 2018 by Dan
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Centrifugal Compressor Class II Tests Performance Test

The test gas is different than the specified gas, and in the reduction of test data it is assumed that the test gas and the specified gas behave in accordance with perfect gas laws. The test piping is a closed … Continue reading

29. April 2018 by Dan
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Centrifugal Compressor Class I Tests Performance Test

The test gas used is the same as the actual gas specified. The pressures are essentially the same as those specified. In general, this class of test can be applied only to air compressors with an atmospheric suction for strict … Continue reading

29. April 2018 by Dan
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Centrifugal Compressor Performance Test

The aerodynamic performance of a stage, of a section, or of a complete casing can be evaluated with an optional test using the procedures covered in the ASME Power Test Code (PTC-10, 1965), Compressors and Exhausters. Aerodynamic performance refers to … Continue reading

29. April 2018 by Dan
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Assembled Centrifugal Compressor Gas Leakage Test

This test comes after the four-hour spin test, and is conducted at maximum seal design pressure (usually settling-out pressure) at zero speed with the seal system operating. The purpose is to check for gas leaks at all joints and connections. … Continue reading

29. April 2018 by Dan
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Centrifugal Compressor Four-Hour Mechanical Test

The four-hour mechanical spin test is a standard test for most vendors. It is also specified in API 617 and in Company Specification CMP-MS-1876. The purpose of this test is to: 1. Check the vibratory behavior of the rotor-bearing system … Continue reading

29. April 2018 by Dan
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Centrifugal Compressor Inspections

The principal inspection points are listed below in the normal manufacturing sequence. The cost of testing is usually added to the purchase cost in a compressor quotation. 1. Pre-Inspection Meeting. Held to review specifications and order requirements at the point … Continue reading

29. April 2018 by Dan
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