Why is a straight pipe section required at the pump inlet?
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Why is a straight pipe section required at the pump inlet, and can’t it be directly connected to an elbow or valve? How long should the straight pipe section be? What is the basis?
Foreign pumps all require a size of 5DN or higher
Straight pipe sections need to be maintained to achieve relative flow stability, ensuring that the pump operates stably under design conditions
I see, it’s to maintain a steady flow
At the suction inlet of a single-suction pump, it is advisable to install a section of straight pipe with a length of about 3 times the diameter of the suction inlet； At the suction inlet of a double-suction pump, it is advisable to install a section of straight pipe with a length of about 7–10 times the diameter of the suction inlet
Ensure the pump has sufficient flow rate and that the pump is fully filled with liquid to prevent cavitation
It’s nothing, just to stabilize the flow.
I learned a bit more – it turns out that leaving a straight pipe section at the pump inlet is simply to stabilize the flow. I used to think that the purpose of doing this was to reduce energy loss and prevent cavitation. Thinking about it now, it really isn’t very reasonable. Thank you all, fellow sailors!
Consequences of not installing a straight pipe section before the pump inlet: cavitation； Cannot pump enough volume ； Worn impeller! Hehe, a teacher just talked about it not long ago! :P
Personally, I don’t think it’s necessary. If straight sections are used, the distance between pumps will become very large, resulting in excessive floor space. Many design firms no longer include straight sections in their designs.
A straight pipe section should be left at the pump inlet to allow the fluid to flow more smoothly.
So far, I have not seen it; there is no straight pipe – instead, the pipe bends directly and enters the pump body.
Prevent flow resistance! It’s usually 4 times the diameter!
I’ve learned a lot! ! I really didn’t pay much attention to this issue before, but now that I know, I need to be more careful when installing pipes in the future
According to the information I’ve reviewed, if no straight section is added, flow deviation will occur, which in turn affects the pump’s efficiency; therefore, it is necessary to include a straight section at the inlet.
I used to think that the additional pipe section was there for adjustment at the pump inlet during installation, and I never considered its impact on flow resistance
Not necessarily; our gear pumps come with male and female fittings right at the inlet.
In fact, the function of stabilizing flow is to prevent cavitation, which is a very important role (for centrifugal pumps)； Other forms of pumps require slightly more
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