Seven analysis of common failures of explosion-proof stainless steel pumps
Explosion-proof stainless steel pump failure 1: the explosion-proof stainless steel pump cannot be started
(1) The prime mover or power supply is abnormal. The treatment method is to check the power supply and prime mover.
(2) The pump is stuck. The treatment method is to check the coupling by rotating it by hand, disassemble it if necessary, and eliminate the malfunction of the moving and static parts.
(3) The packing is too tight. The treatment method is to relax the filler.
(4) The discharge valve is not closed. The treatment method is to close the discharge valve and restart.
(5) The balance pipe is not smooth. The treatment method is to dredge the balance pipe.
Stainless steel double suction split pump
Explosion-proof stainless steel pump fault 2: explosion-proof stainless steel pump can not discharge liquid
(1) Insufficient priming of the pump (or the gas in the pump is not exhausted). The treatment method is to refill the pump.
(2) The pump rotates incorrectly. The solution is to check the direction of rotation.
(3) The pump speed is too low. The solution is to check the speed and increase the speed.
(4) The filter screen is clogged and the bottom valve does not work. The treatment method is to check the filter to eliminate debris.
(5) The suction height is too high, or there is a vacuum in the suction tank. The treatment method is to reduce the suction height; check the suction tank pressure.
Explosion-proof stainless steel pump failure 3: the explosion-proof stainless steel pump stops running after draining liquid
(1) Air leakage in the suction line. The treatment method is to check the suction side pipe connection and the sealing condition of the stuffing box.
(2) The suction side gas is not exhausted when the pump is primed. The solution is to refill the pump.
(3) The suction side is suddenly blocked by a foreign object. The treatment method is to stop the pump to handle the foreign body.
(4) Inhale a lot of gas. The treatment method is to check whether the suction inlet has vortex and whether the submerged depth is too shallow.
Explosion-proof stainless steel pump failure 4: insufficient flow of explosion-proof stainless steel pump
(1) The static head of the system increases. The treatment method is to check the liquid height and system pressure.
(2) Resistance loss increases. The treatment method is to check obstacles such as pipelines and check valves.
(3) The casing and impeller wear rings are worn too much. The treatment method is to replace or repair the wear ring and impeller.
(4) Leakage from other parts. The treatment method is to check the shaft seal and other parts.
(5) The pump impeller is blocked, worn, and corroded. The treatment method is cleaning, inspection and replacement.
Explosion-proof stainless steel pump failure five: the lift of the explosion-proof stainless steel pump is not enough
(1) The impeller is reversed (double suction wheel). The solution is to check the impeller.
(2) The density and viscosity of the liquid do not match the design conditions. The treatment method is to check the nature of the liquid.
(3) The flow is too large during operation. The solution is to reduce the flow.
Explosion-proof stainless steel pump failure six: excessive power consumption during operation
(1) There is abrasion between the impeller and the wear ring, the impeller and the shell. The treatment method is to check and repair.
(2) The density of the liquid increases. The solution is to check the density of the liquid.
(3) Packing is pressed too tightly or dry friction. The treatment method is to loosen the filler and check the water seal pipe.
(4) The bearing is damaged. The treatment method is to check and repair or replace the bearing.
Explosion-proof stainless steel pump failure seven: gas binding phenomenon occurs
The air trap is mainly due to the fact that the centrifugal pump is not filled with liquid before starting. There is air in the pump casing. The air density is small and the centrifugal force generated is also small. At this time, the vacuum formed at the suction port is not enough to suck the liquid into the pump. The phenomenon that the pump cannot deliver liquid after being pneumatically operated.
Cause Analysis:
① Before starting, the pump was not vented, causing air to flow into the pump casing.
②The housing is not tightly sealed, causing air to escape.
Approach:
① Before starting the pump, priming the pump to remove the air accumulated in the pump casing.
② Clean the filter regularly.
③Do a good job of sealing the shell.
