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How To Use The Centrifugal Compressor Table

To utilize this table successfully, you must have certain information available for your compressor application. The most important is flow.

The table is sorted on ascending INLET FLOW as measured in inlet cubic feet per minute. Inlet flow (ICFM) is capitalized because there are several different measurements of flow. If you use one other than the inlet flow used in this table, your selection will be incorrect.

Inlet flow is defined as the flow capacity of the compressor at its design inlet temperature (in Fahrenheit degrees) and design inlet pressure (in pounds per square inch, absolute, not gauge). Do not use standard cubic feet per minute (SCFM) as there are several "standards", all of which are based on arbitrary standard temperatures and pressures and which may or, more likely, may not match your inlet conditions.

Once you have the correct flow, you will need the discharge pressure in pounds per square inch absolute. This number is used to check the discharge pressure rating of the compressor. It represents the minimum design operating pressure the compressor should be able to handle. Donít eliminate the unit if the discharge pressure rating is higher than required. Staging can be removed to reduce the discharge pressure. Even if the discharge pressure of the compressor is lower than required, it may be possible to re-hydrotest the compressor for an increased pressure rating. However, don't arbitrarily assume that a re-hydrotest is possible, as it may not be.

Impeller and diaphragm material must be compatible with the new gas to be compressed. This point is very important for both safety and reliability considerations. Be sure to resolve all compatibility issues.

Casing material also must be checked for compatibility with the new gas and with the inlet gas temperature. Low inlet temperature requires special materials of construction. Try to find a compressor that previously compressed a gas with a similar molecular weight, although this point is not necessarily a major problem. Different molecular weights might be tolerated by an existing compressor.

Using the above discussion points to narrow the selection of a compressor will help you choose one to focus on. There are other points that must be checked before an ultimate selection should be made but these checks will get you off to a good start. If you have any questions, please contact (Bill@eTurbomachinery.com) or (Warren@eTurbomachinery.com).