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Pressure Control Loop PID Parameters

Pressure Control Loop PID Parameters

Pressure Control Loop PID Parameters

(OP)
Hi all,

I am interested in pre calculating my PID loop parameters for a pressure control system for a gas pipeline.

The pipeline draws methane gas from a landfill up to a blower station. The blower station draws a slight vacuum in the landfill (~ -8kPa) and provides pressurised gas to a flare at 20kPa.

The gas pipeline has a volume of approximately 250m^3. The typical gas flow is ~ 2,000 to 3,000 m^3 per hour.

Based on 10% change in gas inflow, a 10% change in pressure would take ~5 minutes. It appears to be quite a slow acting loop and so I would think the k and I terms would be relatively low.

Can anyone give some guidance on how to calculate the K and I terms for a PID loop.

Thanks for your advice on this.

RE: Pressure Control Loop PID Parameters

The integral term should effectively be zero.  For pipelines only the proportional parameter is important.

**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/

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