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Anonymous Poster

High Discharge Temperature Setpoint for Reciprocating Compressors

01/28/2010 10:43 AM

Does anyone know if a rule of thumb exists for calculating what the high discharge temperature shutdown set point should be for a reciprocating compressor based on the theoretical normal operating temperature of the discharge valves? The TC is installed in the discharge manifold.
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PWSlack
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#1

Re: High discharge temperature setpoint for reciprocating compressors

01/28/2010 10:54 AM

The recommended setting will be found in the original equipment manufacturer's Operation & Maintenance Manual.

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Kaisan
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#2

Re: High Discharge Temperature Setpoint for Reciprocating Compressors

02/01/2010 3:29 AM

As usual it depends on many things. High temperature alarms and high temperature trips are set for different reasons. High temperature alarms should be set somewhere around 10 to 20% higher than the theoretical discharge temperature assuming that this temperature is safe for the machine and the process. The purpose of this alarm is to give early warning of deterioration of the rings or valves or of some process upset.

The trip/shutdown on the other hand is to protect the machine and the process and has nothing to do with the theoretical discharge temperature calculated.

Find what you limiting condition is, this is very often the material of the piston rings in process compressors and set your trip a reasonable amount (10% or so) below this value.

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