We are using York Chillers MODEL # YTH3J3E35COG COMPRESSOR MODEL: YDTL-126 SERIAL # GGDC-011017/18 at Fibre manufacturing plant. Experiencing the problem of excessive purges in one chiller. To address this problem we have replaced the cork gasket installed at the big suction leg . The unit holds the pressure test but evacuation takes long time. The foam test also performed on all joints and didn't find any leakages. After annual repair the chillers was test run but still experienced the same problem of excessive purges. Kindly let me know what is the material of the gaskets used at the suction leg. It is suspected because the vaccum time decreased when the bolts of the suction leg retightened. Please help me in this reagrds, to troubleshoot this problem.