The most basic jet pump has a round pump chamber containing an impeller. The outlet to the well is large and the outlet to pressure tank is small. When the pump is primed and switched on it will suck water in and expel it at a higher rate. They are very susceptible to air leaks -every connection MUST be airtight.
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There are two types of jet pumps. Deep well jet and shallow well jet. The deep well has it's jet (ejector) in the well. The jets come in two different configurations. Two pipe and single pipe. The two pipe uses two pipes lowered into the well to the existing water level with the jet on the end. The single pipe jet is hung in the well with only one pipe. The jet has two leathers to seal it to the casing making the casing the second pipe. The shallow well jet pump has it's jet on or in the pump. These pumps can only lift water 25 feet.
Once primed, the jet pump will force water down the pressure pipe into the jet, where it will be sent through a nozzle (of differing sizes depending on pump and water level) and into a Venturi tube (also differing in sizes) which creates a vacuum that will send more water up to be captured in the storage tank.
Yes you can if the water level from the inlet of the pump is less than 25 feet. That's the limit of a shallow well jet pump. It can lift water physically 25 feet vertically, no more. If the well casing diameter is three inch or larger you could also install a submersible pump.[url="http://www.pumpsandtanks.com/Pumps/jet_pumps.htm"]Jet Pumps[/url]
yes
Anything over 80 feet is considered a deep well. A jet pump can pump up from 80 feet, more than that needs a submersible pump.
Assuming that the pump and the pipes are O.K.then your water level has probably dropped.ANS 2 - It is possible, but unlikely for the well level to drop unless many new people or businesses are sucking from the aquifer you are on. Many things can go wrong with pumps and well pressure tanks. If you have a jet pump (motor and pump on surface) these are very susceptible to air leaks in the pipes to well. Check this. If you have a submersible pump the control box can develop problems. -If you have an old pressure tank it can get 'waterlogged'. If you are unfamiliar with any of this hire a well technician or a local well company to check it out.
What size nozzles? What is the GPM rating What is the available pressure What lenght of the hose (fricton losses)