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Sleeving with DWV
Posted: Thu Sep 28, 2006 4:19 pm
by MrCrowley
if i have two pieces of pressure rated pipe for a chamber and i want to join them if i sleeve the outside with DWV do you think it will be safe?
BTW one of the pipes will be glued to the DWV and the other bolted/screwed to the DWV is that safe?its so i can take of the chamber to make the gun smaller for transporting.
Posted: Thu Sep 28, 2006 4:25 pm
by carlbelcher
I would just get a male and female NPT x Spigot fittings, much safer.
Posted: Thu Sep 28, 2006 4:38 pm
by MrCrowley
carl the problem is that no plumbing merchant in Auckland(biggest city in New Zealand)stocks 4"(100mm)pressure fittings,the only 100mm fittings they stock are end caps.
ive got two choices:
1:sleeve with DWV
2:sand down 2mm of both pieces of pipe and sleeve with PN18 pipe(260psi)
the 2nd option will take me about 4hours with my palm sander so if i use DWv it will save me alot of time.
and remeber i cant get any fittings that will do the job so those are my only choices.
Posted: Thu Sep 28, 2006 4:44 pm
by carlbelcher
I still wouldn't sleeve with non-pressure rated pipe... If you do then you will be throwing away the safety margin on your cannon.
Posted: Thu Sep 28, 2006 5:05 pm
by MrCrowley
ok ill spend a few hours sanding it down
Posted: Thu Sep 28, 2006 5:17 pm
by schmanman
Posted: Thu Sep 28, 2006 5:23 pm
by MrCrowley
I can't,its American pipes I.D and O.D theyre different to our pipes I.D and O.D.
and i doubt they ship over seas cheaply.
Posted: Thu Sep 28, 2006 5:59 pm
by SpudStuff
No they are the same usually... The 4" is nominal...
Posted: Fri Sep 29, 2006 2:51 pm
by MrCrowley
its all good now i got out my metal grinder and it worked like a charm in 20min.the gun is finished but i cant fire it for another 10hours b/c of glue and primer