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Fittings don't say SCH 40

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Fittings don't say SCH 40

Unread postAuthor: mpcluever » Sun Dec 23, 2007 6:39 pm

If the fittings don't SAY SCH 40, do I assume that they aren't? Of course the Home Depot employee looks at me like I'm stupid and says that they are supposed to be used with SCH 40 pipe.
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Unread postAuthor: iPaintball » Sun Dec 23, 2007 6:52 pm

Most PVC fittings are SCH 40, but that has nothing to do with whether or not they're pressure rated. They have to say NSF-PW on them.
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Unread postAuthor: daberno123 » Sun Dec 23, 2007 6:54 pm

if they are white, chances are they are schedule 40. I agree with ipaintball that they must say nsf-pw
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Unread postAuthor: TurboSuper » Sun Dec 23, 2007 10:56 pm

daberno123 wrote:if they are white, chances are they are schedule 40. I agree with ipaintball that they must say nsf-pw


...for a pneumatic.
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Unread postAuthor: daberno123 » Sun Dec 23, 2007 11:05 pm

yes you could use dwv fittings for a combustion but i prefer to use pressure rated fittings on everything just for safety.
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Re: Fittings don't say SCH 40

Unread postAuthor: MrCrowley » Sun Dec 23, 2007 11:18 pm

mpcluever wrote:If the fittings don't SAY SCH 40, do I assume that they aren't? Of course the Home Depot employee looks at me like I'm stupid and says that they are supposed to be used with SCH 40 pipe.


If fittings don't have Sch40 on them, then they're not Sch40.

If employee's say they're Sch40 and can hold pressure, ignore them and send them on their way.

When buying fittings in America look for:

PVC Sch40 NSF-PW

Now the Sch rating doesn't matter, but the NSF-PW does, that means it pressure rated.

When buying pipe in America look for:

PVC Sch40 NSF-PW XXXPSI @73F

Now, if the pipe has DWV on it, but still has a pressure rating e.g 300PSI.
It is rated to 300psi.

If it doesn't have sch40 on it but has NSF-PW, it's still pressure rated.

If it has DWV and NSF-PW on the pipe, it's still pressure rated, just means it can be used for DWV applications as well.

The temperature rating e.g 73F, may differ. 73 degrees F is just the most common temperature rating I see.

The temp rating doesn't matter a helluva lot but once you get 10 degrees higher or lower then it, start to take it into consideration and give it a safety factor, i.e don't take it past half it's rating would be a safe bet.

You can also tell what it's rated to by it's ASTM number [markfh11q](should say 'ASTM D2466' if they are pressure rated SCH-40, or 'ASTM D2467' for pressure rated SCH-80) [/markfh11q]
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Unread postAuthor: BigGrib » Mon Dec 24, 2007 12:56 am

for 73 degrees rated pvc i wont let the external temp of the gun drop below 45 degrees and i dont use pvc in a combustion
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Unread postAuthor: golfball 4 » Sun Mar 23, 2008 5:15 pm

My fittings say NSF-dwv but I don't intend to use them over 70 psi do you think they are good or not.
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Unread postAuthor: SpudFarm » Sun Mar 23, 2008 5:26 pm

use them but don't bump into something with them
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Unread postAuthor: Davidvaini » Sun Mar 23, 2008 5:27 pm

DWV will be safe for 70PSI.
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Unread postAuthor: DYI » Sun Mar 23, 2008 6:23 pm

DWV is rated for 10psi, and is safe for 10psi, nothing more. They could be used at 70 psi, but it is not safe by any stretch, as there is no testing of DWV fittings and pipe.

If you value your health, don't use them. Deep, ragged wounds are a real b*tch, and there's no point taking the risk if you don't have to.
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Unread postAuthor: Intel Xeon » Sun Mar 23, 2008 6:48 pm

DWV is not rated for anything. It is designed for drainage, waste, and vents. This just means that the manufacturer did not pressure test the pipe and as far as we know, it could be safe for 10,000 psi, or 1/10 of a psi and we would never know it. As a safety precaution, we advise members not to use DWV because of this risk factor. NSF-pw rated or NSF-61 rated pipe and fittings are recommended if buying plastic pipe in the United States.
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Unread postAuthor: brogdenlaxmiddie » Sun Mar 23, 2008 6:58 pm

All i can say, is that HOME DEPOT employees, specifically ones in the plumming section, don't know crap. I was told something was pressure rated, and I put them on the DUBYA, and guess what? 'dem dogs ain't huntin'.
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Unread postAuthor: Davidvaini » Sun Mar 23, 2008 7:00 pm

DYI wrote:DWV is rated for 10psi, and is safe for 10psi, nothing more. They could be used at 70 psi, but it is not safe by any stretch, as there is no testing of DWV fittings and pipe.

If you value your health, don't use them. Deep, ragged wounds are a real b*tch, and there's no point taking the risk if you don't have to.


if a Pill bottle can be used at 10psi Im pretty sure a pipe with a wall of just as crappy plastic that is 6 times thicker can hold more than 10... I say keep it safe by using NSF-PW but I also say its an exadurations to say it cant be used for more than 10psi... Even if its crappy plastic its still a 1/4" thick and can hold the pressure... but keep it safe and use NSF-PW and not DWV.
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Unread postAuthor: TurboSuper » Sun Mar 23, 2008 10:51 pm

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.
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