Reasons for low leakage pressure of the seal gas at the high-pressure end of the dry gas seal in a centrifugal compressor
Thread Content
The leak pressure at the high-pressure side for PI1808A/B/C has been gradually reduced from 16 kPa/12 kPa/14 kPa to the current levels of 5 kPa/2 kPa/4 kPa. The leakage pressure at the low-pressure side, PI1807A/B/C, remains stable, staying at 18 kPa/16 kPa/15 kPa. Have any of the experts encountered this?
Changes in this gas seal pressure are influenced by factors such as the gap between the gas seal and the shaft, the accumulation of impurities in the sealing strip or corrosion of the mechanical seal, changes in the pressure of the compressed medium, issues with the pressure reducing valve for the sealing gas, and the resistance to the discharge of the sealing gas. There are specified ranges for the parameters of the sealing gas at various levels; if these limits are exceeded, it indicates that there is a problem in some part of the system, and it becomes necessary to disassemble it for inspection and repair. If it is within the specified range, any changes, especially a decrease, indicate that there may be changes in the seal gap; therefore, it is necessary to pay attention to such changes in advance, and at the same time prepare plans for shutting down the equipment for maintenance as well as stock up on necessary spare parts. For reference.
Compare whether the outlet pressure at the high-pressure side decreases before the change in the pressure of the leaked gas.
Compare whether the outlet pressure at the high-pressure side decreases before the change in the pressure of the leaked gas.