Does a screw pump need to be primed?
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The lubrication pump in the lubrication station of the compressor unit within the device is a screw pump. There is a pipeline connecting the outlets of the two pumps; what is the purpose of this pipeline – for preheating the pumps, for filling them with lubricant, or for some other purpose? Is it necessary to prime a screw pump before starting it?
The lubricating oil pump does not require pre-warming; screw pumps have a strong self-priming capability. Opening the inlet valve is essentially the same as filling the pump, and it is important to avoid pressure buildup!
Screw pumps belong to the category of positive displacement pumps, and all positive displacement pumps have a certain level of self-priming capability. As long as the installation height does not exceed this limit, there is no problem; therefore, it is generally not necessary to prime the pump
Opening the inlet valve means starting the pump; the lubrication oil pump does not require preheating, only hot oil pumps with temperatures above 200 degrees Celsius need to be preheated! Remember to open the outlet valve before starting the pump to prevent pump blockage!
A screw pump is a positive-displacement pump and generally does not require priming. But remember to open the outlet valve before starting the pump to prevent pump blockage!
For the first use, the pump must be primed to prevent dry grinding! The same is true for reciprocating pumps
For pumps that require piping, the inlet and outlet of screw pumps are usually kept open. This is because the backup pumps in compressor oil stations are designed to start automatically, in order to prevent a drop in oil pressure caused by a malfunction in the main pump from leading to the shutdown of the compressor; therefore, it is very dangerous if the pump is not filled with oil. . As for the connection cable you mentioned, I’ve never seen it; maybe the design is different. It’s likely to be used for refilling after maintenance, as when the main pump is operating, opening the inlet valve of the standby pump could result in insufficient suction at the main pump’s inlet, meaning vacuum formation; therefore, it’s necessary to run a pipe from the outlet to pour fluid in again.
Although screw pumps have a strong self-priming ability and can draw in the fluid without filling the pump, I believe this is not good for the mechanical seal; prolonged dry operation can easily damage it