【Daily Question No. 343】December 15, 2018
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【Daily Question No. 343】December 15, 2018: Briefly explain why pumps cannot be operated in reverse Weekend easy questions: Either reversal or idling can cause unnecessary damage to the internal components ； Reversing the pump can cause the impeller back cover to loosen and fall off, leading to accidents. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Correct: 3 wealth, Incorrect: 1 wealth ； Mass posting of posts – rated based on the lowest score ； Replies that are unrelated to the answer are considered spam and will be deleted immediately. For management purposes, if you need to view content from a few days ago, please go to https://bbs.hcbbs.com/home.php?mod=space&uid=3862647&do=thread&view=me&from=space through the summary post below
Reversing the pump first fails to ensure continuity in subsequent production; secondly, it can cause the impeller to fall off, resulting in damage to the pump.
Reversing the rotation of the centrifugal pump (1) can cause the pump’s fixing screws (shaft sleeves, end caps) to loosen or fall off, leading to accidents; (2) when rotated in the reverse direction, both the outlet flow rate and pressure disappear
Because either reversal or idling can cause unnecessary damage to the internal components； Reversing the pump can cause the impeller back cover to loosen and fall off, leading to accidents.
Reversing the pump can cause the pump’s fixing screws and shaft sleeve nuts to loosen or even fall off, preventing the pump from operating properly.
When a centrifugal pump is reversed at low speed for a short period of time, it generally does not cause any harm, but reversing it at high speed for an extended period is not allowed. 1. The various components of the pump are designed for normal operation of the pump within its efficient range; if it operates in reverse at high speed, certain components may be subjected to excessive stress, disrupting the force balance and affecting the sealing gaps ； 2. In some pumps, the impeller and other components are secured using nuts depending on the direction of rotation of the pump; if the pump operates in reverse at high speed for an extended period, these securing nuts may loosen or even fall off, leading to accidents.
1. The various components of the pump are designed for normal operation of the pump within its efficient range; if the pump operates in reverse, it may cause certain components to be subjected to excessive stress, disrupting the force balance and affecting the sealing gaps； 2. In some pumps, the impeller and other components are secured using nuts depending on the direction of rotation of the pump; if the pump operates in reverse at high speed for an extended period, these securing nuts may loosen or even fall off, leading to accidents ； 3. When the pump operates in reverse, the angle of inclination of the impeller blades changes from that of a backward-curving impeller to that of a forward-curving one; this reduces the proportion of potential energy head in the theoretical head. Although kinetic energy head can be converted into potential energy head, it affects efficiency.
Because either reversal or idling can cause unnecessary damage to the internal components； Reversing the pump can cause the impeller back cover to loosen and fall off, leading to accidents.
A loose impeller nut in the reverse direction causes the impeller to become loose and generate friction; over time, this can severely damage the impeller and reduce the service life of the centrifugal pump.
Reversing the pump can cause the impeller cover to loosen and fall off, leading to accidents
Reversing rotation can cause the performance parameters of the centrifugal pump to deviate significantly, resulting in excessive shaft power and motor overload. It can also lead to the loosening or detachment of threaded fasteners related to the rotation direction of the pump, such as impeller nuts and round nuts