I have always wondered, does a 1/2" funny pipe act as a bottle neck to a 3/4" rotor valve? I use 3/4" outlet T's from the mainline going in to the barbed fitting that always reduces to 1/2"diameter barbs in standard funny pipe. The funny pipe then leads in to a 3/4" elbow that connects in to the rotor body's 3/4" opening. Does that diameter restrictrion through 1/2" funny pipe cause any flowrate issues for a 3/4" inlet rotor? If not, why don't rotors use 1/2" inlets to match the funny pipe diameter? Thanks.
Excellent thought. Yes, it can. However, the bottleneck effect may not be realized unless the length of funny pipe is long. The effect will be decreased dynamic pressure due to increased friction loss. Picture what 2ft of funny pipe versus 25ft of funny pipe might look like. Bigger bottle neck becomes a bigger problem, small bottleneck is likely not a problem.
Thanks for the easy to understand video. Does the Hunter SJ swing joint assemblies use standard 1/2" funny pipe. If I had the 6" assembly and found that I needed an 18" length to position a particular sprinkler head, could I pull apart the assembly and substitute the 18" length for the 6" length? Thanks again!
Hi Bob. We just tested this ourselves. It is doable. It is possible to use a sharp blade to cut one of the barb ends off, however, the swing pipe does seem to be thicker and more rigid and it was a bit difficult to re-insert the fitting. But it is doable.
Hello! Great question. This depends on the depth of the lateral pipe (feeding the sprinkler), and the sprinkler is placement. If in doubt, you can build your own using swing pipe and fittings.
