Why is it strictly prohibited to turn the shaft of some high-pressure feed pumps during preheating?
Thread Content
The operating procedures of several units state that for high-pressure feed pumps, it is strictly prohibited to turn the pump shaft during preheating. For example, the EiGen high-pressure feed pumps, as well as those produced by Shin-Nihon Kikai Co., Ltd., require that cranking be strictly prohibited during the preheating phase. Dear experts, why is that? I seek your guidance
This post was last edited by ylb913 on 2016-7-23 06:51. During the warming-up period, turning the rotor can cause the moving and stationary parts to engage with each other; due to the small gap between these parts, as well as the rotor’s static deflection, and the large temperature difference between the upper and lower casings, uneven heating leads to deformation. Therefore, the turning rotor is prone to locking at this time; it is necessary to carry out rotor turning after the preheating is completed, and during preheating, the temperature difference between various points of the pump body should not exceed 30°C. http://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1577676&page=1