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Pressure rated dwv?

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Pressure rated dwv?

Unread postAuthor: igpay » Tue Jun 17, 2008 11:42 am

Ok, so yesterday I went down to the local osh and bought two lengths of pipe. two feet of 2" and two feet of 1". The two inch pipe says, "J-M MANUFATURING 2" SCH 40 PVC1120 280PSI@73F NSF-pw ASTM D2665 NSF-dwv DWV JM90 R 2007Jull10 14 L.S" The parts written in bold are actually written in bold, so it worries me that it says DWV in bold, but I'm also confused because it says NSF-pw. The 2" is only going to be used as the barrel, and I'm only using this gun at 100 psi or less. Also the 1" I bought has no writing (because I had it cut) but I assume it is also DWV. I saw other pieces of 1" in the store that were rated up to 300 psi or so, so is it safe to assume they're the same? Someone please help me, I understand that I could be very seriously injured if these are the wrong types of pipes so, this is very important to me.

Thanks.
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Unread postAuthor: frankrede » Tue Jun 17, 2008 11:46 am

If it has a pressure rating, ignore the DWV

its safe
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Unread postAuthor: igpay » Tue Jun 17, 2008 11:48 am

Ok, thank you so much, I was really worried. (I'm a safety freak)
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Unread postAuthor: rp181 » Tue Jun 17, 2008 12:45 pm

DWV means drain waste vent, nothing about not being pressure rated, its just usally not.
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Unread postAuthor: Davidvaini » Tue Jun 17, 2008 12:45 pm

yeah dwv is made out of the same stuff, just sometimes it doesn't get pressure tested so there is no guarantee that it is pressure rated. Just always stay away from cellular core.

BUT make sure it says NSF-pw and don't just assume that it will be okay.

Also I have seen some fittings that are smaller that say NSF-PW but if there is a larger (longer) fitting always go with that one.
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Unread postAuthor: jimmy101 » Tue Jun 17, 2008 1:08 pm

Since DWV is a lower spec than is NSF-pw ALL NSF-pw pipe is also DWV.

Schedule 40 really only defines a few critical dimension of the pipe and fittings. Primarily the OD of pipe and the ID of fittings.

Davidvaini wrote:yeah dwv is made out of the same stuff, just sometimes it doesn't get pressure tested so there is no guarantee that it is pressure rated.


1. DWV is not made of the same stuff. It may be made of the same stuff. There is a big difference between "is" and "may". Non-pressure rated PVC pipe made specifically for DWV only use is often cell core. The fittings are often the evil "two-diameter" type.

A. I seriosuly doubt that pressure rated pipe is actually pressure tested. I would bet they only test a couple pieces per manufacturing lot.

III. Since DWV doesn't require a pressure rating "pressure rated" and DWV are completely unrelated specs. The presences, or absence, of one has nothing to do with the presence, or absence, of the other.

This is what, the gazilionth time this question has been asked?
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Unread postAuthor: sandman » Tue Jun 17, 2008 1:21 pm

lol, jimmy u need to save that post in a text file on your desktop, so u dont have to keep typeing it :P
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Unread postAuthor: MrCrowley » Tue Jun 17, 2008 3:00 pm

If you have time jimmy101, maybe you could add that to this:
http://www.spudfiles.com/spud_wiki/inde ... _Rated_PVC
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Unread postAuthor: igpay » Tue Jun 17, 2008 3:08 pm

Sorry I wasted your time jimmy, but yes, please do add it to the spud wiki, because I looked there first and couldn't answer my own question.
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Unread postAuthor: psycix » Tue Jun 17, 2008 3:18 pm

A pressure rating goes above a line of text saying what it is.
If it sais crap-core pvc - 200PSI it may be partly made out of poo, but it does hold 200 PSI. :D
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Unread postAuthor: jimmy101 » Tue Jun 17, 2008 5:14 pm

psycix wrote:A pressure rating goes above a line of text saying what it is.
If it sais crap-core pvc - 200PSI it may be partly made out of poo, but it does hold 200 PSI. :D


True, so I should have added to my response that an explicit pressure rating trumps everything else on the pipe. So, a crap-poo pipe that actually says 220 PSIG is good stuff (except for the smell).
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Unread postAuthor: joestue » Tue Jun 17, 2008 8:51 pm

The PVC1120 means it is PVC type I grade 1. Hydraulic design stress of 2000 psi, or a safety factor of 2.5, industry standard. burst is 5600 psi.

the only other PVC i've seen is 2116 Type II grade 1, design stress of 1000 PSI.

DHW also means it is good to 140 Fahrenheit at some specific derating, i lost that pdf...trying to find it again
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Unread postAuthor: daxspudder » Tue Jun 17, 2008 9:04 pm

Your good to go, just dont take advice from people who cant take good advice themselves... joestue
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Unread postAuthor: psycix » Wed Jun 18, 2008 7:53 am

joestue, do you think that information was useful?
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Unread postAuthor: joestue » Wed Jun 18, 2008 4:54 pm

absolutely, if the manufacturer don't want to guarantee a product but is sill kind enough the give the material properties of the product, feel free to use them
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