reveivl

The issue here is that I have to cut into the line for a supply to an out building, and there is no room in the existing pex to add on the house side of the 'tee' under the bladder tank. (The connectors are too close to each other). Can I cut in on the pump side of the tee? (Between the filter and the tank). It doesn't seem to me to make any difference, but that is why I am asking.

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KillerToiletSpider

You can, but you won't have any water pressure on that branch.

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gmp

First you need to determine where is the back-check valve. Is it at the well head or at the pressure tank location. As long as the back check is before you tee off you'll be fine.

If it's after (or near the pressure tank) you will only have flow when the pump is refilling the tank.

Bill

Quite correct, as long as you install the T AFTER the check valve you will be fine and you will have pressure. If you do not see a check valve and you have a submersible pump the check valve is usually at the head of the pump UNLESS it has failed and one was placed further up on the line. The check valve is usually a small brass section slightly larger than the pipe and about 3 to 4 inches long. I have seen what they call "Tank Tees" which has a built in check valve.If you install the T before the check valve you will only have "Pump" pressure and every time you turn on a faucet the pump will run making for an early point failure.

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reveivl

Thanks, guys, I'll look for the check valve. Everything I drew is existing already (although not as pretty), the 'tee' is simply that, there is no difference in the pressure from one side to the other, the tank is 'tee'd' off the supply line from the pump through the filter.

If I hear nothing further from you I'll go ahead and cut in! (Gotta love pex)

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"Too much is always better than not enough"--J.R. "Bob" Dobbs

queequeg99

This is a good point. Depending on your answers to the questions raised above, you may want to think about whether cutting into the line before the bladder tank will result in significantly premature failure of the well pump. One of the main purposes of a bladder tank is to reduce short cycling of well pumps (which can reduce their life span). If you cut in before the pressure tank but after the back check valve, you should be fine. But if you cut in before the back check valve, pressure in the new line will be caused solely by the well pump and you may significantly increase the amount of short cycling (although as long as the pump is not broken you should still have relatively good pressure, if a bit uneven).

reveivl

Tks for all your replies. It's over now. No check valve was present (unless it was integral to the pump which I doubt). Cut in, supplied the new system, pressure came up and the pump cut off. Ran the water in the new system and no cycling of the pump, so all is well. Only had a couple people near me to make sure I wasn't blowing it so I appreciate all your input, Rich.

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"Too much is always better than not enough"--J.R. "Bob" Dobbs

mdshunk

That's not true. Depends on where the pressure switch and check are at. I assume they're back at his pump.