A common case of leakage of multi-spring mechanical seal
The case occurred on a KSB high-temperature hot water pump. There are four Etanorm SYT high-temperature hot water pumps on the site. Since the site is a new chemical project stage, the pump has not been put into formal use, and there has been water in the pipeline. Nearly half a year after the pump was shut down, the owner wanted to run the pump according to the site needs, but found that three of the four pumps leaked, and the leakage was large.
机械密封泄露情况视频Leakage of the meachanical seal
Communicate with the customer, disassemble one of them, find out and analyze the cause of leakage.
拆解图1 Photo 1
拆解到机械密封图3 Photo 3 of mechanical seal
There is no obvious damage on the contact surface of the mechanical seal, sludge found on the springs.
According to the analysis of leakage phenomenon and disassembly findings, the dirt in the water is deposited at the small spring, resulting in the abnormal operation of the spring, the sealing surface can not fit together normally, and the problem of large leakage occurs. To deal with the leakage of the mechanical seal of the other two pumps, instead of disassembling the pump, we just use the pipeline water to wash the mechanical seal cavity, and manually turn the positive and negative gears to make the dirt deposited in the seal cavity become floating, so that the spring can recover its normal function, the sealing surface fits together, and the leakage problem is solved temporarily. In the later stage, the owner is recommended to install the mechanical seal cavity flushing system to ensure the normal operation of the mechanical seal.