Forum Title: Well pressure tank
Hi-- New guy here. I need to pick your brains for a problem I may have. My underground pressure tank is junk and I'm going to purchase an Well X troll WX-350 to replace it. The existing tank is the very old (1960) galvanized model and probably does not have a bladder or diaphragm. The inlet pipe from the well pump is 1-1/4" and tank outlet is also 1-1/4". After the pipe exits the underground well house the 1-1/4" pipe is reduced to 3/4" copper pipe which runs for 150' to the inside of the house. I am moving new tank indoors. I have already tak'n care of the electrical but being that the tank will now be in the house I am concerned about pipe sizing. What I will have is 3/4" copper pipe attaching to the new well pressure tank instead of the 1-1/4" the old tank had outside in the well house. Can I use the existing 3/4" pipe in the house to attach to the new tank which has a 1-1/4" fitting. Will the well pump work harder filling the tank thru a 3/4" line? Before the tank was receiving water thru a 1-1/4" line and now will be only 3'4" Anyone see a problem here? Thanks for your help. I'm sure you will have questions.
Category: Plumber Post By: ERIC SANCHEZ (Las Vegas, NV), 04/10/2016

The first thing you would have to do is move the pressure switch so it's close to the new tank. If you leave it at the pump house, the pump will hammer on and off rapidly because of the friction in that long 3/4 pipe. The pump won't work any harder, it will just take longer to fill the tank. If it's a submersible pump, it will just pressure up higher while trying to push water to the tank. If you have a jet pump, it probably won't matter much.

- STACEY FLEMING (Portage, MI), 09/10/2017

And before you purchase that big pressure tank, you might want to look at these. YouTube

- CAROLYN RAMIREZ (Round Rock, TX), 10/04/2017

Quote: Originally Posted by speedbump The first thing you would have to do is move the pressure switch so it's close to the new tank. If you leave it at the pump house, the pump will hammer on and off rapidly because of the friction in that long 3/4 pipe. The pump won't work any harder, it will just take longer to fill the tank. If it's a submersible pump, it will just pressure up higher while trying to push water to the tank. If you have a jet pump, it probably won't matter much. Thanks Speedbump. The pump is a submersible style pump. I have run the wiring to the well house already and will have the pressure switch attached to the new tank inside the house. Appreciate your response. Quick question--Do you think a buffer tank installed in the well house with the 1-1/4 fittings would help with the pump running less? I would also have the 119 gallon tank in the house.

- CYNTHIA WALKER (Hammond, IN), 10/09/2017

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