Regarding the venting issue of pipeline pumps
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This post was last edited by kbly222 on 2011-1-21 at 11:19. A new pipeline booster pump has been installed in the system recently, and it is necessary to fill the pump before each start-up. I noticed that the drain valve leads from the seal gland; what is the flow direction inside? Logically, the amount of fluid that leaks into the seal should be minimal.
When starting a pipeline pump, air is usually vented; here, there is a vent valve located in front of the pump’s inlet pipe, which directs the air to the drain. The owner has installed the exhaust valve at the mechanical seal gland – I’ve heard of this for the first time, but it’s really good for pumps. This prevents air from entering the sealing chamber, facilitating long-term operation of the mechanical seal.
Reply to 2# lovestory: But the question is: how can the liquid escape from the mechanical seal gland? How does it flow out of the pump chamber? I’m not sure how the flow direction inside changes
The medium is inside the machine seal gland; if you connect a pipe to it, it can certainly be used as an exhaust pipe! The pressure inside the mechanical seal is higher than that at the inlet, and in the event of a leak, the amount of fluid that escapes can be quite significant.
Reply to 4# lovestory: Okay, I’ve learned it, thanks