4 replies to this topic

[Anup Paul]

Dear All,

This forum was been a great source of information for me to learn and share knowledge.

I have prepared a simple spreadsheet for evaluating the compressor performance. I am doing this because we have planned to evaluate the performance of all centrifugal compressors in our plant.

I request you to kindly evaluate my sheet and give your valuable feedback.

Thanks
Anup Elias

Attached Files

•  compressor monitering sheet.xls   27KB   108 downloads

[sheiko]

Very good spreadsheet.

I have not checked the calculations but just some remarks:

- I would add the required power (mass flow times head)
- I would add some charts to better vizualize the performance trend (Especially the polytropic exponent which should stay steady and slightly below the design value. For that reason this is a good performance indicator.)
- If the polytropic exponent exceeds the design value, then you might want to check the measured T and P, or the compressor itself for leakages or other mechanical problems...

Edited by sheiko, 24 September 2012 - 06:38 PM.

[Bobby Strain]

So, how are you going to store, retrieve, and analyze the data? Looks like you have just begun. If you don't know how to program, there is no time like now to begin to learn. It's always good to get driver data coincident with the compressor data.
Bobby

[ankur2061]

Anup,

I would like to add to your compressor monitoring sheet some information related to "Dry Gas Seal" such as seal gas supply pressure, temperature (temperature should be be maintained at least 20°C above the dew point of the injected seal gas) and differential pressure across the dry gas seal filter/coalescer. The most unfortunate part of centrifugal compressor monitoring is that the process & operations engineers think that monitoring dry gas seal performance is the job of a rotary equipment specialist. Nothing could be further from the truth. Ther rotary specialist will provide guidelines for dry gas seal operation parameters and suggest corrective measures for normal trouble-shooting. The process engineer or process operator is the one who is actually continuously monitoring whether the process parameters of the seal gas for the dry gas seal are maintained within the prescribed limits of pressure, temperature, entrained solids/ liquids. A majority of centrifugal compressor failures and related downtime causing production losses have been attributed to dry gas seal failures.

Hope his helps.

Regards,
Ankur.

[jrtailor09]

Dear all,

I would like to add one more important parameter that is vibration monitoring. As I feel that is also important.

I know there is a compressor trip due to vibration also (some time malfunction) but as a operator he can not by pass this.

Regards,