Analysis of the reasons for diaphragm breakdown in diaphragm pumps
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The operators reported that the diaphragm pump was not functioning properly, with no change in outlet pressure. Upon shutting down the pump for inspection, it was found that the diaphragm had been damaged. Could experts please analyze the possible reasons for this issue? Thank you!
Corrosion, aging, outlet blockage, high medium density
1. Incorrect material selection: The diaphragm must be chosen based on the medium to be used; some require custom fabrication. For example, some diaphragms are not resistant to organic solvents; if you expose them to such solvents, they will naturally get damaged easily. The temperature resistance of the diaphragm is conditional, depending on the medium, especially the temperature. 2. Proper and reasonable use: If the right material is selected, that is, if the material of the diaphragm is suitable for the material to be pumped, and if the diaphragm itself is of good quality. The fact that that diaphragm breaks easily is likely related to whether it is used correctly. Diaphragm pumps often operate at high speeds, and conditions such as running dry or operating partially under vacuum can affect the service life of the diaphragm. The presence of a large amount of solid particles in the logistics material can also affect its service life. Also, the lifespan of the diaphragm is determined by a certain number of usage cycles, ranging from 8 million to 20 million cycles. With proper use, it can operate continuously for around 1,000 to 3,000 hours, based on the lower end of this range. If the diaphragm keeps breaking, the main reason is that the wrong material was chosen for it.
Corrosion and aging – this is usually the reason here. Another issue is using the wrong medium.
What the original poster is referring to are diaphragm metering pumps used for adding chemicals on-site. The diaphragm pumps we use for adding corrosion inhibitors stop working for no apparent reason; the diaphragms have been replaced twice, and the exact cause is still under investigation. . .
Check what the medium of the diaphragm is; if it’s coal slurry, it might be that a hard object scratched the diaphragm. This has happened in our company before