hye all,
I don’t know whether this has been discussed or not before. But I did searched and I didn’t find what I really want and I don’t know the keyword to write. This is regarding to the positive displacement pump working philosophy. As we know, for the positive displacement pump running theoretically will be independent of discharge pressure which means that the pump will keep on pumping and the pressure will keep on increasing if there is any blockage at the discharge until the relief valve pop-up or any internal parts of pump or discharge system failed. Am I correct?
The questions are:
What parameter need to check if existing positive displacement pump need to be relocated to a new location and there is a very significant pump discharge piping modification which is additional 300 meter piping length. Does the pump will be adequate to deliver liquid at new location? Based on the working philosophy above, it should be adequate to do so isn’t?
What happened if due to the significant additional pipe length, the pressure drop increased and exceed the discharge pressure stated in the pump datasheet AND also the set pressure of relief valve?
For centrifugal type, it is common to see the minimum flow line. For the PD pump, normally don’t have the minimum flow line isn’t? If yes can I know why or what is the reason?