【Daily Question 2019】Hydrogen production and hydrogenation section – Question No. 029
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【Daily Question 2019】Hydrogen production and hydrogenation section – Question No. 029: What are the reasons for the decrease in pressure and flow rate of a centrifugal pump during operation? Reference answer: (1) Impeller clogged, installed in reverse or rotating in the opposite direction ； (2) Large axial displacement ； (3) Air entrainment in the conveyed liquid. . (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
Clogged impeller, reversed installation, or reverse rotation cause air entrainment in the liquid being transported.
1. The pump inlet filter is clogged； 2. Blockage in the impeller flow channel ； 3. Impeller corrosion ； 4. The outlet check valve is stuck
(1) Impeller clogged, installed in reverse or rotated in the opposite direction； (2) Large axial displacement ；
(1) The prime mover or power source is abnormal. The solution is to check the power supply and the prime mover. (2) The pump is stuck. The treatment method involves manually rotating the coupling for inspection; if necessary, it is disassembled for inspection in order to eliminate faults in the moving and stationary parts. (3) The filler is pressed too tightly. The solution is to loosen the filler. (4) The discharge valve is not closed. The solution is to close the discharge valve and restart. (5) The balance pipe is not unobstructed. The solution is to clear the balance tube.
(1) Impeller clogged, installed in reverse or rotated in the opposite direction； (2) Large axial displacement ； (3) Air entrainment in the liquid being transported
1. Slow cavitation of the impeller leads to a decrease in efficiency. 2. Gradual wear of seals such as mouth rings. 3. Decreased efficiency due to long-term operation of the motor
(1) Impeller clogged, installed in reverse or rotated in the opposite direction； (2) Large axial displacement ； (3) Air entrainment in the conveyed liquid.
Cavitation, evacuation, loose impeller, motor reversal, etc