【Mechanical Equipment Technology Exchange Edition】Mechanical Equipment 【Daily Question】20201128
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True or False: If a pump is not used for an extended period of time, it is necessary to turn its shaft to prevent the shaft from bending or deforming. (√) For the daily question activity in the rotating equipment section, please reply within three days. :victory: Rewards range from 5 to 15 points depending on the response; those who can provide detailed answers will receive additional rewards. All forum members are welcome to participate actively and help promote the development of the forum! ! !
This post was last edited by Zhongyuanren on 2020-11-28 at 09:37. Correct interpretation: 1. The purpose of turning the pump shaft before starting it: 1) Whether it is a newly installed pump or one that has just been overhauled, turning its shaft helps to determine whether it operates smoothly, without any sticking issues, and whether there are any unusual noises inside; this prevents damage to the pump during startup or damage to the motor due to excessive current. 2) Some large-scale units are also used for warming up and lubrication before startup, in order to prevent localized overheating between the rotor and the casing after startup, which could lead to thermal deformation. 2. Purpose of turning the pump shaft when it is shut down: 1) For a unit that has just been stopped (in the case of a normal shutdown), this is to prevent thermal deformation. Generally, it needs to be cooled for a short while before being coiled. 2) For units that have been out of service for an extended period, regular shaft turning is necessary to prevent shaft bending or deformation, as well as to avoid jamming of the pump rotor due to the transmission of media with high viscosity; generally, the shaft should be turned 180 degrees each time.