4F19S20
4F19S20
(OP)
Hi everyone, I have a question about water flow. I have a F&W 4F19S20 19gpm 2hp at a depth of about 360ft 1.25" pvc pipe and pumping into a open 3000gal tank, so not much head pressure. My well is supposed to be a 15GPM well. This pump is over pumpimg the well. Could I use a orifice flow restrictor to solve my issues, or would I be damaging the pump? If I can use an orifice restrictor how do I determine the size of the orifice?
any help would be greatly appreciated.
any help would be greatly appreciated.





RE: 4F19S20
So long as you can do a simple flow measurement from time to time you should be ok.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: 4F19S20
You post doesn't really give enough real info to assist with a pumping problem, that's if one exists anyway, however your question on orifice plate is probably well covered by LittleInch but I would be looking a bit further into the well / pump performance before going the track of controlling the pumping capacity.
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: 4F19S20
RE: 4F19S20
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: 4F19S20
RE: 4F19S20
RE: 4F19S20
It could be a seasonal thing, although at 360ft I wouldn't expect the aquifer level to fluctuate very much - it could aquifer permeability, well inlet area, or the well hasn't been developed correctly.
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: 4F19S20
RE: 4F19S20
Good luck.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: 4F19S20
Was the well pump / flow tested at completion, any results?
Has there been any change to the standing water table?
How do you know the pump is delivering 19GPM, has this been measured or is it just an assumption based on pump data, which for some reason uses 19GPM as a reference point?
However get some meaningful advice, I suggest you throttle the discharge flow and accurately measure the output under steady flow conditions, this means a bit of trail and error until the pump can run at maximum output without losing prime (surging) this will allow some "guess work" as to where the pump might be running on its curve - from there we can re-assess what the best move is. If the pump is over capacity, I am thinking maybe long term you could think about removing 1 impeller from the stack but this requires some accurate flow measurements to make this sort of decision.
Alternately, seeing as how this is really only a "toy" pump of 2HP, just throttle the discharge to a point that the pump runs without surging and leave it at that.
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: 4F19S20
RE: 4F19S20
I theory any vertical pump can have 1 or more impellers removed to give less head. As for reducing flow, yes it will but flow is a function of the head imposed on the pump and without more detail there is no way to predict the flow rate.
Suggest you ask the manufacturer if 1 impeller can be removed and what is involved, they will probably ask why -- so you need some answers - same as what I have asked so they can advise you on likely flow rate.
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)