PRASADA
07-12-2011, 02:01 PM
HAllo
We have Mcquay PEH 126 chillers . As per manual whenever the LUB oil trips due to any reason , OIL from a resorvoir supplies oil to bearings by gravity and eventually the chiller trips on LOW differential pressure .
But it doesn't work, and by the time it coasts down the impeller and high speed shaft gone due to in sufficient oil flow.WE have experienced this on 2 chillers. Looks like there is a flaw in the basic design.Normal OIL pressure is 100 PSIG .OIL from resorvoir can give may be 3 psig and even if it is pressurised by Evaporator ***** , it can be only 35 PSIG. How can a high speed bearing sustain such low pressure when it is designed for 100 PSIG.?
Look forward to the experience and advise from other forum members and Mcquay.
We have Mcquay PEH 126 chillers . As per manual whenever the LUB oil trips due to any reason , OIL from a resorvoir supplies oil to bearings by gravity and eventually the chiller trips on LOW differential pressure .
But it doesn't work, and by the time it coasts down the impeller and high speed shaft gone due to in sufficient oil flow.WE have experienced this on 2 chillers. Looks like there is a flaw in the basic design.Normal OIL pressure is 100 PSIG .OIL from resorvoir can give may be 3 psig and even if it is pressurised by Evaporator ***** , it can be only 35 PSIG. How can a high speed bearing sustain such low pressure when it is designed for 100 PSIG.?
Look forward to the experience and advise from other forum members and Mcquay.