I've lived off grid for 35 years and have had a well for 31 of those years. I had a oldtimer neighbor who told me you can set up the submersible pump to be used as a fire hose/nozzle set up. I never got the details of how to pipe it. I have 1" PVC out of the well to the storage tank. There would have to be a shut off to the tank so the water diverted to the nozzle, but how do you turn the nozzle off without blowing the system. There must be some way to divert to the tank once you shut off the nozzle. I can't come up with any way, thought someone here might know. thx

 

I wouldn't recommend connecting directly to the deep well submersible pump.
If you need something to fight fire..... use a small pump off your storage tank.

On the other hand...... if you have a fire...... who cares about the pump..... divert the water directly to a hose and fire nozzle.

 

A lot depends on what you consider a fire pump. You could hook a garden hose up to your water system. Cheap and simple but probably would deliver a barely useful amount of water. Then next up on the list of power would be to divert all the output from your well to the fire hose. You would be limited by the 1" pipe size, the output of your well pump after lifting the water and the amount of water stored in your well. Perhaps the most powerful would be to have a dedicated submersible well pump dropped into your storage tank and plumbed directly to your fire hose. Anything you add to automatically do anything or direct water flow is just going to increase complexity.

Piping and hose size are important to overall system performance as is minimizing sharp 90 degree elbows. Next is pumping power. My fire pump is 5 hp feeding a 1 1/2" hose which after raising water from the pond's elevation to the house is still somewhat weak pressure for a fire hose. Lastly you'll need a good water source. A fire pump will pump a well dry very quickly so you'll need a good size reservoir. In my system there are no valves or controls. It's either on or off and all the output from the pump goes to the fire hose. Because of my pump choice it can't develop enough pressure (maxes out at about 90 psi) to burst the piping but a deep well submersible pump could develop much more pressure so you probably wouldn't want a nozzle you can close.

 

As the others have eluded to, you need a tremendous amount of water to fight a fire. You might be better of having a fair amount of fire extinguishers on hand to fight a fire or some fire extinguisher balls.

Example: https://www.amazon.com/Fire-Extingui.../dp/B07D42CXWV

https://www.youtube.com/watch?v=L_0sawCkIk4