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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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A new slant on Shop Air Piping
I have just finished the hydronic heat piping for the new house and
had a couple hundred feet of 1/2" PEX left over from the 3000 feet purchased. The building inspector was giving me conflicting test requirements. The installation manual says 60 psi air test and the inspector wanted a 100 psi hydrostatic test so I got on the phone to the manufacturer. They sent out an intallation engineer who told me the PEX could handle a 300 psi hydrostatic test. I suggested it might be good for shop air in that case and he said it would be just fine. Remember this PEX is a Polyethylene compound and pretty flexible so it won't shatter if ruptured. Its not cheap at $.52/ft in 1000 ft rolls but what can you do with the remnants when the heating system is in. BTW I never did perform the hydrostatic test as I hadn't quite finished purging the air from the six water circuits when the inspector arrived. The system had held steady on 100psi air pressure for 10 days though so he & I were pretty confident there were no leaks. The system has seven ball valves, seven unions, a silver soldered copper manifold and about 20 other joints in it. Anybody got a shop air system of this complexity that DOESN'T leak. All joints are above the slab so repair was doable but not necessary. Leigh@MarMachine |
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