hoseplumbingpool
I'm filling a pool, and looking to speed up the process. I have two hose bibs, and wonder if I'm really gaining anything (and how much) by using both?
The house is supplied by a 3/4" line. This tees into two 1/2" lines, one going to each hose bib.
I'm thinking that with one hose, I'll get the volume provided by a 1/2" pipe. Adding the second hose will not double the flow, but should only make it as if a single hose was fed by a 3/4" pipe.
Is my intuition correct?
You likely need a backflow valve to meet code regulations these days. That said, I don't see any reason to have two of them. Whether it's at the hose bib, or at the well, it's doing the same thing for you.
I suppose one argument for putting it closer to the well is that you block more of the water from back flowing, but if the pipe to the hose is rated for potable, that shouldn't matter.
Since you mentioned freezing in some comments, I recommend this:
This is a freeze-proof hose bib, complete with anti-siphon valve to prevent water running backwards from your yard into your supply plumbing should the pressure go off.
Best Answer
I would expect more water to flow unless you have extremely low water pressure. You have a 3/4" line and all the water pressure of either a municipal water system or a water pump. Splitting that into two lines will not likely double the flow rate as there is a pressure drop, but it should increase the total flow rate considerably. I would expect it to almost double, but not quite.
This would be easy to test with an empty bucket. Time how long it takes to fill the bucket with one hose on and then with both.