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Posted: Sun Mar 23, 2008 10:56 pm
by MrCrowley
TurboSuper wrote:You'd never believe this, but I actually saw some DWV pipe with a pressure rating on it! It was in KPa, converted it was ~50 PSI IIRC.
Anyways, a good rule of thumb is to just leave out PVC DWV pipe/fittings for any pneumatic launcher and the higher end combustions.
You can have pressure rated PVC that has DWV written on it. Just means that it can also be used for DWV applications.
Posted: Sun Mar 23, 2008 10:59 pm
by TurboSuper
Durr...but this wasn't NSF-PW at all, it was pure DWV.
Posted: Sun Mar 23, 2008 11:01 pm
by MrCrowley
Maybe it's the other way round, DWV that can be used for pressure applications?
Posted: Sun Mar 23, 2008 11:02 pm
by TurboSuper
Well, very low pressures, like gravity.
Like I said...IIRC, I may not have recalled correctly at all, it could have been less, but they did rate it to some pressure.
Posted: Sun Mar 23, 2008 11:08 pm
by MrCrowley
Well if it was rated to ~50 PSI it should've said about ~350Kpa.
With the price of PVC in America I don't see why you would bother getting PR DWV (from a farmer's perspective). I mean you may as well get the full PR stuff for a few cents more. (Not taking into consideration mass commercial use)
Posted: Sun Mar 23, 2008 11:12 pm
by TurboSuper
Heh, well, I'm not American, and I'm talking about ABS (I really should have mentioned that, my bad).
Getting full out NSF-PW pipe here is a huge PITA. I have to order it from a specialty shop who orders it from a supplier, and they always bork my order.
Us Canadians are ABS freaks, PVC is pretty much limited to large sewer applications or small fittings (at least in all the hardware stores I've been to). The PR stuff isn't really anythink special, I just noticed it when I was reading the markings.
Posted: Tue Mar 25, 2008 4:28 pm
by golfball 4
Thanks I went out and bought schedule 40 fittings today at a real pipe store.
I just wanted to be on the safe side.
Posted: Tue Mar 25, 2008 10:59 pm
by MrCrowley
Sch 40 is only a thickness rating. I hope those fittings have NSF-PW or NSF-61 on them
http://www.spudfiles.com/spud_wiki/inde ... _Rated_PVC
Posted: Tue Mar 25, 2008 11:07 pm
by elitesniper
Dang, you should put in the forum rules:always use pressure rated pipe in spudguns!
Posted: Wed Mar 26, 2008 5:03 am
by Hydra
DWV just means Drain, Waste and Vent. It doesnt mean it's weak. But most DWV isnt PW.
If you can fit a PW pipe into a fitting perfectly, then its PW
Posted: Wed Mar 26, 2008 5:40 pm
by DYI
DWV just means Drain, Waste and Vent. It doesnt mean it's weak. But most DWV isnt PW.
If you can fit a PW pipe into a fitting perfectly, then its PW
OD is always the same, regardless of thickness or rating, for a given nominal diameter.
The DWV around here is rated for ~10 psi, and it all has some miniscule rating - all drain pipe has to, as some pressure will exist in drains, in most cases.
Pipe that is only rated for Vents has no rating, but DWV pretty much has to have some. Copper pipe that is rated only DWV is often rated for well in excess of 300 psi, but that follows slightly different guidelines than PVC...
Posted: Fri Mar 28, 2008 12:55 am
by Hydra
DYI wrote:DWV just means Drain, Waste and Vent. It doesnt mean it's weak. But most DWV isnt PW.
If you can fit a PW pipe into a fitting perfectly, then its PW
OD is always the same, regardless of thickness or rating, for a given nominal diameter.
The DWV around here is rated for ~10 psi, and it all has some miniscule rating - all drain pipe has to, as some pressure will exist in drains, in most cases.
Pipe that is only rated for Vents has no rating, but DWV pretty much has to have some. Copper pipe that is rated only DWV is often rated for well in excess of 300 psi, but that follows slightly different guidelines than PVC...
Umm really? My friend accidently bought 40mm DWV but he got a 40mm PW end cap. The end cap didnt fit the DWV well and just slid off. I thought it was because the OD is thinner than PW... But the ID is the same.