For Severe Service Control Solutions, Turn to Fisher Technology and Innovation D351140X012 July 2004 A new ethylene plant in Saudi Arabia installed a Fisher-optimized antisurge system for its critical antisurge valves. A compressor surge event occurs when gas begins to flow in the reverse direction through the impellers in a compressor. This can have undesirable consequences in terms of upsetting operations, altering internal compressor clearances, and stressing compressor seals. Antisurge or recycle valves allow a portion of the compressor flow to be diverted back to the compressor's inlet and thereby avoid a surge event. The typical requirements for an antisurge valve include: extremely fast stroking speeds (less than two seconds), high capacity, extreme noise attenuation (up to 40 deci

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