What are the reasons why a reciprocating cryogenic liquid nitrogen pump cannot deliver sufficient flow? How to solve it?
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Our company’s low-temperature reciprocating liquid nitrogen pump is used to supply high-pressure nitrogen to oxygen vaporization tubes; the main parameters are as follows: Pump inlet pressure: 0.05 MPa； Outlet pressure: 16MPa ； Flow rate: 1000 m3/h ； Rotation speed: 313r/min ； Power: 11KW. The following issue occurs during operation: the pressure at the pump outlet remains at 8-9 MPa; it is not possible to increase this pressure. What is the reason? How to solve it?
There are many reasons, and it’s not detailed enough! Is the pipeline design reasonable? Being able to reach 9MPa is already quite good!
The rotation speed is only 313 r/min? ? ? ? ? ? ? Can such a low rotation speed achieve such a high output? We have a speed of 1600 revolutions per minute, a flow rate of 2000 cubic meters, and the maximum pressure is 3 MPa
The parameters for 3# 525h are fine; then what could be the reason why the reciprocating cryogenic liquid pump cannot deliver a sufficient flow rate?
A liquid pump is designed to pump liquids; the main reason it cannot pump is the lack of liquid. The reasons include: 1. Whether there is a U-shaped tube in the liquid pump inlet pipe, whether it is not smooth enough, or whether its diameter is insufficient. 2. Is the liquid temperature too high? 3. Is the insulation around the liquid pump inlet pipe adequate? 4. Is the air return of the liquid pump smooth? 5. Is the exhaust valve of the liquid pump in good condition? 6. Is there sufficient head at the inlet of the liquid pump?
Check whether the return pipeline at the pump inlet is unobstructed, whether the inlet filter is clogged, whether the inlet and outlet check valves are functioning properly and free of leaks, and whether the piston rings are worn.
Open the exhaust drain to release gas, and check whether the return valve is open; it could be a problem with the pump or the motor
Are the inlet and outlet check valves functioning properly?
1. Is the inlet filter clogged? 2. Are the two ball valves built into the pump working properly? 3. Is there air in the system? The air must be removed before it can be used
The outlet pressure of a plunger pump is determined by the pressure in your pipeline; it becomes as high as the pressure there is, and as low as the pressure allows
It has not cooled down fully, or the inlet pressure is low, resulting in blockage