A question about the pressure of diaphragm pumps
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This post was last edited by A Le on 2015-6-12 08:19. A hermetically sealed sampler needs to be installed next to a liquefied gas tank with a pressure of PN1.2Mpa and at room temperature. The 1/4 size sampling pipeline has no mechanism to drive the flow of the medium, and it is required that the remaining medium in the pipeline after sampling can be returned to the tank. There is a nitrogen supply with a pressure of PN1.0 on site, so the manager decided to use a pneumatic diaphragm pump. However, it was found that the maximum pressure of diaphragm pumps offered by many manufacturers is only 0.7 Mpa; some manufacturers said it was possible while others said it wasn’t. I really don’t understand anything about fluid dynamics. Could you all tell me whether a diaphragm pump with such a pressure level can meet the requirements? There are only a few imported brands of diaphragm pumps that can meet the requirements, but their prices are very high. I’m considering switching to pneumatic piston pumps; are there any examples of such use?
On the first floor, the outlet pressure of the pneumatic pump can reach 2-3 times the pressure of the air supply; I have experience using it, so rest assured – there will be no problems.
A pneumatic pump is a positive-displacement pump; the outlet pressure is equal to the inlet pressure plus the pressure generated by the pump. Therefore, I think it’s no problem for the fluid to flow back through the pipeline pump. But the import pressure is already greater than the pump’s maximum pressure – is that possible?
No, if the pump pressure is too high, the components inside the pump will get damaged (the pressure level might be sufficient from a numerical standpoint, but the equipment itself cannot withstand such pressure)
Inlet pressure? It seems this matter wasn’t mentioned in the post; I just replied by stating 12 kilograms as the output amount. The pump’s flow-through section can easily withstand two to three times the pressure of the air supply; of course, the pressure of the air supply used to drive the pump should not exceed 8 kilograms. If the inlet pressure is too high, then it’s a different story
There are only a few imported brands of diaphragm pumps that can meet the requirements, but their prices are very high. I’m considering switching to pneumatic piston pumps; are there any examples of such use?
This post was last edited by zhaoxufei on 2015-6-12 08:44. I wonder what amount of traffic the original poster needs? How expensive can a pneumatic pump be? If it’s okay, let me give my bid too. This pump is designed to be used as a tool, and it cannot operate continuously for long periods of time; intermittent use is what is recommended. By the way, in the petrochemical industry, this type of pump is also used for injecting sulfiding agents; there are actual usage examples for it, with an output of around 12 kilograms