Disposal System Feeds – Control Valve Discharges

Control valves may add to the overall discharge into the disposal system. Unless the control valve is expected to fail open (e.g., due to instrument air failure), the required relief rate should be used as the input to the disposal system. Where both a control valve and a relief device are present, and both discharge to the same disposal system, the required relief rate is conservatively assigned to the relief device.

Situations in which a control valve fails open to the disposal system should be analyzed consistent with the guidance presented below for depressuring valves.


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