I have two questions about plumbing pool piping to a pump.
(1) I have a pool pump with 2" threaded inlet and outlet connections, however, my piping orare 1.5". I wanted to use those hi-temp unions to allow me to uncouple the pump for service if necessary. So I need to transition from 2" to 1.5" somewhere. So first question is, do they make a hi-temp union that is 2X1.5? I did a search and could not find one.
(2) If there is not a reducing hi-temp union, then I need to transition from 2 to 1.5 somewhere probably at the end of the 2" union I can transition to 1.5, what is a good fitting to use? A 2X1.5 PVC bushing? or a 2X1.5 reducing coupling which will provide a more gradual transition? May be it doesn't matter.
(3) This is more a general question. I looked at many pool plumbing examples to get an idea what others do, and one thing that really puzzled me was how many pictures I saw online used drain fittings and even no hub rubber couplings. This is very surprising as drain fittings are not designed to be pressurized and their hubs are much shallower than standard pressure fittings. Why is that? I do get that when a pump is running, there is an open end to the pool, so the pressure is not as high as a domestic water line where pressure may be 45psi or higher and when no fixture is running there is a constant pressure, but still, I wouldn't expect drain fittings to be used. Are people using drain fittings because the fittings have less friction loss due to the gentle sweep angle and that is a bigger advantage over the pressure fittings?
(1) I have a pool pump with 2" threaded inlet and outlet connections, however, my piping orare 1.5". I wanted to use those hi-temp unions to allow me to uncouple the pump for service if necessary. So I need to transition from 2" to 1.5" somewhere. So first question is, do they make a hi-temp union that is 2X1.5? I did a search and could not find one.
(2) If there is not a reducing hi-temp union, then I need to transition from 2 to 1.5 somewhere probably at the end of the 2" union I can transition to 1.5, what is a good fitting to use? A 2X1.5 PVC bushing? or a 2X1.5 reducing coupling which will provide a more gradual transition? May be it doesn't matter.
(3) This is more a general question. I looked at many pool plumbing examples to get an idea what others do, and one thing that really puzzled me was how many pictures I saw online used drain fittings and even no hub rubber couplings. This is very surprising as drain fittings are not designed to be pressurized and their hubs are much shallower than standard pressure fittings. Why is that? I do get that when a pump is running, there is an open end to the pool, so the pressure is not as high as a domestic water line where pressure may be 45psi or higher and when no fixture is running there is a constant pressure, but still, I wouldn't expect drain fittings to be used. Are people using drain fittings because the fittings have less friction loss due to the gentle sweep angle and that is a bigger advantage over the pressure fittings?
