Pump Selection

I see a problem here. OP says "its suction pipe dia is 1.5 inches".

I agree with everyone so far (1) the pump has to be a submersible pump, or a pump with a very long shaft to the bottom (well pumps used to have these in many irrigation applications, but oil had to be supplied to the well shaft bearings as a drip.

The 1-1/2" diameter "suction" pipe is a bit narrow. You might have to go with something like a windmill water pump (uses a gear motor on a horizontal shaft wind turbine), the gear motor output has sucker rods (with leather seals, or could be rubber flap seals) that are mounted on the output wheel, resulting in sucker rod motion up and down cyclic. The water is actually pushed into succeeding sections of sealed off sucker rod during the down stroke, while the seals block off return flow during the up stroke.

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The scheme needs reconsideration as #1 above is correct. There is no prospect of achieving 55ft lift as the pump will not prime, so the donkey pumps under trial will have failed due to no suction lift being available to enable them to be wetted. The installation as it stands is a non-starter.

Place a submersible pump at the bottom of the pipe instead, and displace the donkey pumps. Google "submersible pumps" in the first instance, narrowing-down the selection using details of the lift and flowrate required, what is available locally, access down the bore, power supply available locally, any spares compatibility, maintenance arrangements, what the bloke down the road says about them, etc., etc.

If you literally only have a 1.5" well casing that is 55' to the water level, then you have 3 choices.

1- find a downhole (submersible) pump that will fit down that casing

2- use a jet pump or similar with a packing educator sized for 1.5" casing (if you can get it)

3- redrill to a bigger casing

If the casing is larger, find something that will work in that size. No matter what, if the water table is more than about 20' down you have to have a system that will push rather than pull the water up the bore regardless of where the pump situated.

Unless I missed something, I don't believe its the casing that's 1.5", its the suction pipe that's 1.5" diameter.

One other alternate, is to run a PVC line down there, with a check valve and use a pump jack. It would initially have to get primed.

Maximum suction height is about 25' at sea level....best to keep it as low as possible for efficiency....

Deep well pump

The pump you linked to is 1.25" suction size, how is that going to fit inside the well bore on the OP's well?

The outlet pipe is 1/1/2 inch,but the pump wont go inside of a 1 1/2 inch pipe.

Go back to the donkey pumps, as that is about all you will find to fit down the narrow well casing/suction tube. These pumps lift by forcing the water up into the pipe string.

Go over your donkey pumps - replace any worn out parts, parts that are attempting to seize up due to lack of lubrication and maintenance, and replace old dried up bearings that are rusty. Then put a motor on the pumps each that has a 2.5 HP rating, and you will be pumping water again.

Perhaps a diagram would help.....? What is your required GPM delivery...?

Is this the type pump you are using....?

https://en.wikipedia.org/wiki/Pumpjack

You can use a packer jet kit with a regular shallow well pump.

The flow rate is very low for the HP used,but it is better than nothing.

This has a 1 inch diameter tube inside of the 1 1/2 inch pipe.

The kit has special turned couplings with a smaller O.D.

The two pipes are joined at the top with a flange at the pump,and a jet at the bottom in a special fitting containing the venturi and jet.

Been 30 years since I have seen one,and I am not sure if they are still available.