For any industrial compressor why do we assign the interlock like this:
Low pressure trip for lube oil and low flow trip for cooling water
and why not vice versa ?
Answers
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09/04/2010
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Ralph Ragsdale, Ragsdale Refining Courses, ralph.ragsdale@att.net
Actually, flow measurement is more reliable for either, because unexpected backpressure could reduce the flow undetected and cause trouble. Temperature is another good way to spot trouble, isn't it?
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09/04/2010
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keith bowers, B and B Consulting, kebowers47@gmail.com
Lube oil pressure in the bearing supply gallery is the best indicator of bearing health in most cases. Loss of pressure is a critical event requiring immediate shut-down to avoid catastrophic destruction
Cooling water systems usually have very 'flat' pressure to flow rate curves (by design). This means a significant decrease in CW flow rate (what the machine needs) may not be accompanied with a pressure change and the change could be either positive or negative depending on the cause. Flow rate is the important factor, not pressure.
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