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the failures are on both dol and vfd motors

yes so the npsh is imposible to calculate well at least i cant but a may be posible? the only way i can think of is to take the lowest or worst case point of the second pump and spec the firsst pump to not fall bellow this set point press and flow

the pump i am talking about needs no diesel it runs on very low voltsge and can be powered from a bike but if the option of going to wind poweter or solar power was there i would take it. look up grundfos sq solar wind these pumps are the future

so if you are feeding a recproicating pump the head flow is constantly changing. and proformance of second pump will always change

i am a little unsure in what you are asking but if you look at a pump curves of a particular pump and you put a cent pump pump in series wih an identical pump it will do twice the differential press across the both pumps as each pump can raise the pressure by x amount (same value press not flow)...

i do warranty work for a large pump manufacture and recently i have noticed a large number of motor bearing failures. the bearings that are fitted are de c3 and nde c4 differant sizes. the failure is a high pitched what i would like to know is. is this due to the temp of the application and the...

a archimedes screw is a good option for this application. but for a more up to date solution. i have just done a course at the poul due jensen academy and grundfos have a bore hole pump that can be ran from solar power, wind turbine and they have an test rig set up in the academy to run from a...