Centrifugal Compressors and High Discharge Temperatures

You might need to contact the supplier, Captain. Which make of compressor is it, anyway?

Its cooper make.If i had to go back to supplier why wud i post it question on this site...i want technically geninuine answers.

Hello roto,

You said: If i had to go back to supplier why wud i post it question on this site...

Because they are more familiar with their own equipment than anyone here might be. By not going to them first, you are wasting time.

How old is the compressor? Have there been any changes lately?

Mike

Indeed. Someone had to ask.

Look at your cooler, it's not working...

While you should definitely contact the manufacturer, have you checked the water pressure drop across the final stage after-cooler? Just changing the cooler does not mean that any restriction outside the cooler has been eliminated.

It can be anything- scale that broke loose from the piping, pieces of leaf that got into the cooling tower (or other materials- including bugs, bird feathers, etc.)

It might be more of a problem with your inter-coolers rather than your after-cooler. Also possible that you're getting some inter-stage leakage from the discharge back to the inlet side. Are you monitoring the inlet temp for each stage? Did you check for fouled inter-stage cooler tubes? You only mentioned only the after-cooler replacement? How clean is your cooling water? Is it a closed or open system, recirculating or once through city water? Is one of the suction modulating valves not operating properly?

Agree. The only way you can increase the 3rd stage discharge temperature is to increase the third stage suction temperature or increase the pressure ratio of the 3rd stage. That's the law.