imranmd
27-08-2007, 01:37 PM
I am facing oil carry over problem in the Air refrigeration unit installed at N2 plant. We blocked 2 tubes in the Air cooler (evaporator) as these were leaked. The Oil Separator was opened and inspected the float. It was perfectly allright. 68kg refrigerant R134a charged with Clavus 68 Oil. The system perfomance was immaculate after flushing and recharging, but we are facing problem of oil carry over 3L oil to be charged in every week. There is oil recovery line starts from bottom of the Evaporator having Sight Glass goes to the Compressor suction via a small heat exchanger where heat exchanged by high temperature of delivery line of the Compressor. There is one more Sight Glass after that heat exchanger. There is no fluid flowing through these sight glasses. The system is equipped with Hot gas bypass valve also. After adjusting all the working parameters, expansion valve, the oil is not recovering from the system. Can you help me in finding the problem? Can we use Shell Clavus 68 with R134a gas, as we have been using it since last 6 years without any abnormality?