im aware of longevity issues relating to rpm speed from operating gen sets and higher rpm never last as long as lower running ones do. Probably is the same for pumps. i noticed they do sell a flow sleeve for the grundfos 3 inch pumps. dont know why though.
the 4 inch goulds pumps seem to have Centripro motor not Franklin motors unless franklin makes centripro motors also. i dont see any grunfos 4 inch pumps only 3 inch.
when talking about what depth to set the pump at do people refer to that number in referance to where the intake of the pump is set at or in referance to the top or bottom of the pump?
If putting a 4inch pump in a 4.5 inch casing does it matter that there is only .25 of an inch or so around the pump once in the hole. i read that most 4 inch pumps wont fit into a 4 inch casing although this is a 4.5 inch casing ( or at least thats what the reciept says, ill have to make sure by actually measuring it)
Looking at the diggers reciept i noticed that he dug to 140 ft total but set perferated pipe from 130 to 110 ft. so when you commented that as long as the pump isnt set below the perferated pipe it should be ok if the pump is set at 126ft since that is still 4 ft above the perferated pipe end.
thanks for all the input from everyone.