LNG tank pump starts
Thread Content
There is a 30,000 cubic meter LNG storage tank. Ebara's in-tank pumps are in use and one standby. The liquid level in the tank was 18 meters and the pump was stopped due to the construction of the outlet pipeline. After the construction was completed, there was a start-up delay when the pump was started again (the start-up mode was soft start and could not be transferred to the power frequency). The operator closed the outlet valve and still failed to start. Please ask an expert to analyze whether the liquid level is too high and the back pressure is too high. How to deal with it.
What is the relationship between liquid level and pressure? Are you talking about the pressure in the pump well being too high? There is usually a pressure gauge on the outlet pipeline of the pump well. Check the reading of the pressure gauge. I think the problem of being pressed too hard should be eliminated. Isn't there an exhaust pipeline installed on the pump well? If the outlet is overpressured, the gas can be discharged back to the storage tank.
The higher the liquid level and the higher the pressure, the easier it will be to start. The inability of the soft start to switch to the power frequency is usually caused by the outlet opening being too large and the current being too large. Check whether there is backflow or continue to close the outlet valve.