How do you control what angle plumbing joints go in at?

I'm an electrical engineer, working on repairing a somewhat complicated pneumatic system, but I figured this would probably be the best place to ask. This is probably a very basic question to anyone who works in plumbing, but I couldn't find anything about it online.

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When you have right-angle pipe fittings, the kind with NPT threads that you screw together, how do you control what angle they screw in to? If you just screw two things together, the relative angle between them will be essentially random as it depends on the exact angle of where the thread starts and how far the threads engage. But we need to put in pipe at specific angles to align fittings to other parts of the system, so how does one actually do that?

The following physical properties of the pipe must be regularly tested in order to be certified to AWWA C900: Sustained pressure, Burst pressure, Hydrostatic pressure integrity, Flattening, Extrusion quality (Acetone Testing) and Ring-tensile test. The testing of these physical properties assures the product quality of the finished products has not deviated from the design specifications.

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For information about the testing required by AWWA for certification of PVC pipe and fittings, refer to Uni-Bell's Technical Brief: AWWA Standards for PVC Pipe: Product Testing

Note: similar testing is required for ASTM D PVC Pipe.

Please contact Technical Services at 855-624-, Option 3 or for more information.

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