6.5 ANTISURGE LAW IN PARTICULAR CASES

The antisurge law we have examined come from a basic equation and satisfies the most complex cases but these laws can be simplified in simpler cases to be examined from time to time. Let us briefly consider two cases:

6.5.1 Electric motor-driven compressors (fixed revolutions)

In these cases, the following law can be used:

since:

the law gives a straight line parallel to the axis of ordinated crossing Q1 at .

The error in the suction capacity in relation to the suction conditions is:

A schematic diagram making the equation h1 = K is shown here below:

6.5.2 Variable revolution compressors

With near-constant suction conditions and constant delivery temperature (cooler) and cases where it may not be possible to measure the suction capacity owing to design or economical reasons.  The following law can be used for the above

since:

 the law gives a parabola crossing the origin (see Figure 6.14).

 The error in the suction capacity in relation to the suction and delivery conditions is:

 The diagram realized the equation h2 = K is shown in the figure. 6.15

For more details. click here to see Antisurge Field Installation, Including the Instrumentation devices attached

www.bennypass.it