Problems with the mechanical seal of the feed pump in hydrocracking reactions?
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Problems with the mechanical seal of the feed pump in hydrocracking reactions? 1. Which are the domestic manufacturers? ； 2. What should be taken into consideration if going with domestic alternatives? ； 3. What is the price of domestic machine seals compared to imported ones? Thank you!
1. Provide complete mechanical seal components or drawings of the sealing chamber. 2. Parameters of the main machine and the medium being transported. 3. Pipeline? 20%–30% agents = localization
This post was last edited by Li Lili Xutao on 2015-9-12 at 20:41. The mechanical seals we have been using are those of the Dandong clone type, with metal bellows and quenching steam
Is it a series-connected mechanical seal? Does the bellows of the mechanical seal tend to coking?
Mechanical surface coking is primarily determined by the medium, operating temperature, and sealing fluid system. Both bellows-type and spring-type mechanical seals can experience coking, but metal bellows have a better resistance to coking
The price of domestically produced mechanical seals is approximately 30% of that of imported mechanical seals, depending on the specific circumstances
It’s not a series-connected seal; there is only one set of stationary and rotating rings. No coking was detected, and there was only slight leakage. Upon disassembly, it was found that the tar had cooled down and stuck to the bellows, reducing its elasticity and causing the leakage
How long can it generally run? Are there any improvements available? Mine is imported, and it tends to clog up; it works for about half a year
Thanks to the use of quenching steam and flushing, the operation remains relatively stable. It has been in use for over a year now. The shaft seal, which used PTFE gaskets, became damaged and caused steam leakage, so it had to be replaced. Coking is not very severe; the main issue is that after the pump stops, steam must be used to clean and remove the medium inside the pump, in order to prevent a drop in temperature after shutdown, which could lead to a decrease in the viscosity of the tar and result in tar caking on the bellows