Starting And Running Of Screw Pumps
The complete pipe line system must be flushed and pressure tested before installing and operating the pump. If any corrosive liquid is used for the same, then complete system to be properly drained and dried for the protection of the complete system. To get more news about screw pump, you can visit hw-screwpump.com official website.
* Before starting the pump for the first time, it must be completely filled with working liquid as shown in figure below.
* Make sure the prime mover motor is isolated electrically and turn the pump-motor coupling by hand to check it is turning smoothly.
When pump is ready to be started, first briefly switch on and off the motor and check the direction of rotation is as per the marking on the pump.
* Start the pump and keep checking suction and discharge pressure gauges for rated pressure.
* Check prime mover motor ampere and compare with rated current.
Check for any leakages from mechanical seal or other joints of the pump, flanges, etc.
* Air in the pumping liquid causes abnormal vibration, noise and over heating of the pump and liquid which may result in a fire hazard.
* Periodically inspect foundation bolts, coupling pads, leakages and performance of the pump as condition monitoring to avoid breakdown maintenance.
All systems with screw pumps must be equipped with a pressure relief valve installed immediately adjacent to the pump.
* In normal medium capacity pumps, this pressure relief valve is an integral part of the pump to protect the system against excess pressure.
When liquid is circulated through the valve it heats up in proportion to the set pressure level and the percentage of by-passed liquid.