Centrifugal pump failure: (3) Liquid density increases. The solution is to check the liquid density. Light Truck Spare Parts,Truck Spare Parts,Truck Spares, Light Truck Spares Jinane Baisheng International Trade Co.,Ltd , https://www.jnbisontruck.com
Centrifugal pump can not start or start the load causes and treatment as follows:
(1) The prime mover or power is not normal. Approach is to check the power and prime mover situation.
(2) centrifugal pump stuck. Approach is to use hand-drive coupling inspection, disintegration inspection, if necessary, to eliminate static and dynamic part of the fault.
(3) (The packing is too tight, and the packing method is to relax it.
(4) discharge valve is not closed. Approach is to close the discharge valve, restart.
(5) balance pipe is not smooth. Approach is to clear the balance tube.
b Centrifugal pump does not drain the cause and treatment are as follows:
(1) Insufficient centrifugal pump (or the gas in the centrifugal pump is not exhausted). Approach is to re-infusion heart pump.
(2) centrifugal pump steering is wrong. Approach is to check the direction of rotation.
(3) centrifugal pump speed is too low. Approach is to check the speed, increase speed.
(4) filter plug, the valve is not working. Approach is to check the filter to eliminate debris.
(5) suction height is too high, or vacuum suction tank. Approach is to reduce the suction height; check the suction tank pressure.
c Centrifugal pump after discharge due to disruption and treatment as follows:
(1) suction pipe leakage. Approach is to check the suction side of pipe connections and stuffing box seal.
(2) When filling the heart pump, the suction side gas is not exhausted. Approach is required to re-centrifugal pump.
(3) Suction side suddenly blocked by foreign bodies. Approach is to stop the centrifugal pump to deal with foreign matter.
(4) Inhalation of large amounts of gas. Approach is to check whether the inlet whirlpool, submerged depth is too shallow.
d lack of traffic reasons and solutions are as follows:
(1) same b, c. Approach is to take appropriate measures.
(2) System static head increased. Approach is to check the liquid height and system pressure.
(3) resistance loss increases. Approach is to check the pipeline and check valve and other obstacles.
(4) shell and impeller wear ring wear too much. Approach is to replace or repair wear ring and impeller.
(5) other parts of leakage. Approach is to check the seal and other parts.
(6) centrifugal pump impeller blockage, wear and corrosion. Treatment is cleaning, inspection, exchange.
e Lack of headaches and solutions are as follows:
(1) Same as (1), (2), (3), (4), c (1), d (6) of b. Approach is to take appropriate measures.
(2) impeller mounted anti (double suction wheel). Approach is to check the impeller.
(3) liquid density, viscosity and design conditions do not match. The solution is to check the physical properties of the liquid.
(4) the operation flow is too large. The solution is to reduce the traffic.
f running in the power of the reasons and treatment is as follows:
(1) impeller and wear ring, impeller and shell have grinding 檫. Approach is to check and repair.
(2) Same as e (4) above. The solution is to reduce the traffic.
(4) packing pressed too tight or dry friction. Treatment is to relax the filler, check the water seal tube.
(5) bearing damage. Approach is to check repair or replacement of bearings.
(6) speed is too high. Approach is to check the driver and power supply.
(7) Centrifugal oil pump shaft bending. The treatment method is to correct the pump shaft.
(8) Axial force balance failed. Approach is to check the balance hole, the return pipe is blocked.
(9) Coupling misalignment or axial clearance is too small. Approach is to check the alignment and adjust the axial clearance.
g centrifugal pump vibration or abnormal sound causes and treatment as follows:
(1) Same as c (4), f (5), (7), (9). Approach is to take appropriate measures.
(2) The vibration frequency is 0 ~ 40% working speed. Too large bearing clearance, loose bearings, impurities in the oil, bad oil (viscosity, temperature), blistering due to air or process fluid, poor lubrication, bearing damage. Treatment is checked, take appropriate measures, such as adjusting the bearing clearance, remove impurities in the oil, replace the new oil.
(3) Vibration frequency is 60% ~ 100% working speed. Bearing the same problem with 5
(2), or the sealing gap is too large, loosening, sealing wear. Approach is to check, adjust or replace the seal.
(4) Vibration frequency is 2 times working speed. Misalignment, loose coupling, seal friction, shell deformation, bearing damage, bearing resonance, thrust bearing damage, shaft bending, poor cooperation. The treatment method is to check and take appropriate measures to repair, adjust or replace (5) the vibration frequency is n times the working speed. Pressure pulsations, misalignment, shell deformation, seal friction, support or foundation resonance, piping, machine resonance, treatment methods are the same (4), strengthening the foundation or piping.
(6) Vibration frequency is very high. Shaft friction, seals, bearings, imprecise, bearing jitter, poor shrink fit and so on. The same treatment (4).
h bearing fever and treatment as follows:
(1) bearing pad scraping research does not meet the requirements. Approach is to repair bearing pads or replacement.
(2) bearing clearance is too small. Approach is to re-adjust the bearing clearance or scraping.
(3) Lack of oil, poor oil quality. Approach is to increase the oil or replace the oil.
(4) bearing assembly bad. Approach is to check the bearing assembly requirements, eliminating unmet requirements.
(5) cooling water circuit. Approach is to check and repair.
(6) bearing wear or loose. Approach is to repair the bearing or scrapped. If the pine association, compound the relevant bolts.
(7) shaft bending. The treatment method is to correct the pump shaft.
(8) rejection oil ring deformation, rejection oil ring can not rotate, with no oil. Approach is to update the oil slinger.
(9) Coupling misalignment or axial clearance is too small. Approach is to check the alignment and adjust the axial clearance.
i seal heat causes and treatment are as follows:
(1) packing pressed too tight or friction. Treatment is to relax the filler, check the water seal tube.
(2) water seal and water seal tube dislocation. Approach is to re-check alignment.
(3) flushing, cooling well. Approach is to check flushing cooling circulation tube.
(4) Mechanical seal is faulty. Approach is to check the mechanical seal.
j rotor movement causes and treatment as follows:
(1) improper operation, operating conditions away from the centrifugal pump design conditions. Approach: Strict operation, the centrifugal pump is always running near the design conditions.
(2) the balance is not smooth. Approach is to clear the balance tube.
(3) balance plate and balance plate seat material not meet the requirements. Approach is to replace the material to meet the requirements of the balance plate and balance plate seat.
k water hammer causes and treatment as follows:
(1) As a result of a sudden power outage, the pressure in the system fluctuates causing the negative pressure of the exhaust system to escape. Bubbles dissolved in the liquid escape the gas in the centrifugal pump or pipe. The treatment is to purge the gas.
(2) high pressure liquid column due to a sudden power outage quickly influx, the impact of centrifugal pump outlet check valve plate. Approach is to improper discharge of centrifugal pump system piping, piping accessories to transform the layout.
(3) The outlet pipe valve is closed too fast. The method is to slowly close the valve.