What are the methods for connecting a series mechanical seal to a flushing pipeline, and how can leaks at the connection point be prevented?
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As the title suggests: In the PLAN53A flushing scheme, the connection between the flushing pipeline and the mechanical seal is made using threads (with thread plugs), resulting in poor sealing. Moreover, due to limited space, it is difficult to tighten this connection, which causes white oil to leak frequently. How do you handle this issue? Are there any welded ones? Manager Discussion Group
I’m guessing, could a hose be added?
1. Apply more raw adhesive tape. 2. Replace the cone-shaped fitting. 3. If neither of these solutions works, then the threads on the gland are damaged; if the threads cannot be repaired, welding is an option, and it’s best to install a swivel joint as well. (This makes it easier to replace it when a new seal is needed.) A set of such seals also costs several thousand dollars, and the boss won’t want to lose them either.
The problem is that we have replaced multiple sets of machine seals, including the external gland, but the oil leakage issue in that area still hasn’t been resolved
Is the thread on the pipeline damaged?
Maybe. Do you have the drawings with the threads? Are there any particular considerations for manufacturing and installation? ?
This is a problem that comes up quite often. Our solution is to use imported yellow tape, which works very well; domestic white tape isn’t very effective.
This post was last edited by zpbin on 2016-1-15 22:23. It can be found in this mechanical design manual, but it’s necessary to know what the thread specification of the machine seal is – G3/8? G1/2 ? NPT3/8 ? NPT1/2？ It’s hard to say for sure. The best approach is to ask the pump manufacturer to send two units; when purchasing spare parts, ask them to include two as well. It’s not expensive. Just insist that there’s a problem with their fittings, saying that leaks keep occurring and have not been resolved. Pump factories usually provide it. I heard that the direction in which the duct tape is wrapped also makes a difference
Can it be pressurized after installation? Up to what pressure should the pressure test be conducted? Next time, we want to conduct a pressure test on-site before allowing the manufacturer of the mechanical seal to leave; otherwise, if the problems aren’t resolved we’ll let them go, and it will be difficult to figure out what’s wrong if issues arise later
What brand is the imported raw adhesive tape, and where is it **manufactured?