Pump inlet reduction
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This post was last edited by qy576100527 on 2017-6-1 09:53. Everyone, take a look – is the diameter change at the pump inlet reasonable? This pump is used for transporting methanol; is it acceptable to install it with a variable diameter? What is the purpose of the pipe running from the pump body to the outlet in the third photo?
You can check the design specifications for oil storage tanks as outlined by Guo Guangchen. Additionally, based on the photos you’ve taken, the current setup is not reasonable; static electricity prevention measures must be in place during the transportation of methanol. If installed in the way you described, methanol will experience a pressure increase as it passes through the sections with different diameters, which leads to turbulent flow and an increased risk of static electricity generation. Moreover, when installing reducers on oil pipelines, the diameter difference between the two ends should be less than 1; if the diameter change is significant, a discontinuous reduction method should be used. I’m not sure if the answer meets the requirements; let’s study it together
The pump inlet will have a diameter change, depending mainly on whether suction is taken from above or below. In the third image, this tube is likely used to prevent pressure buildup, acting like a communication tube. Is the original poster in the methanol industry?
The inlet diameter is reasonable; that small tube must be the return pipe
To prevent cavitation, the suction pipe is designed to avoid the formation of \"air pockets\", for which an eccentric diameter change is employed. Whether the top or bottom is flat depends on the direction of the suction pipe. The suction pipe enters the pump from bottom to top, keeping it level at the top” ； The suction pipe enters the pump from top to bottom, with its bottom at the same level.