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NFS-DW? is it safe.

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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NFS-DW? is it safe.

Unread postAuthor: 8tonsemi » Tue Jun 05, 2012 10:20 am

I found this pipe with the rating NFS-DW not PW and it was rated to 230 psi is it safe to use on a air cannon. It was three inch pipe.
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Unread postAuthor: samiam0295 » Tue Jun 05, 2012 10:38 am

That is probably DWV pipe but the V didnt print. I dont believe there is DW pipe. Even though it is rated, it is probably cellular core, which is not safe to use.
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Unread postAuthor: 8tonsemi » Tue Jun 05, 2012 10:48 am

Thanks thats why I was checking.
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Unread postAuthor: Gippeto » Tue Jun 05, 2012 11:20 am

Is the rating printed on the pipe?

How about a pic?
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Unread postAuthor: 8tonsemi » Tue Jun 05, 2012 11:26 am

Sorry I can't post a pic because I saw it in a store.
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Unread postAuthor: Technician1002 » Tue Jun 05, 2012 12:08 pm

Is it ABS (black) or PVC (White)? Pressure rated ABS is great. PVC is brittle.
and it was rated to 230 psi
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Unread postAuthor: 8tonsemi » Tue Jun 05, 2012 12:31 pm

It was just run of the mill white pvc. So Abs is good for air cannons?
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Unread postAuthor: 8tonsemi » Tue Jun 05, 2012 12:32 pm

http://www.homedepot.com/h_d1/N-5yc1v/R ... reId=10051

Is this the stuff your talking about.
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Unread postAuthor: mattyzip77 » Tue Jun 05, 2012 2:02 pm

You cant get pressure rated 3 inch pipe at Home depot. I think they only have up to 2 inch nsf/pw there. It will clearly say it on the pipe, nsf/pw, or nsf/dwv! You want nsf/pw, not the dwv. dwv is not safe for a pneumatic!!
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Unread postAuthor: Technician1002 » Tue Jun 05, 2012 3:35 pm

Check the links in my sig. The PVC Mouse Musket was retired due to a crack. The ABS DWV Test Cannon is still going strong. It is due it's annual pressure test.

I got the idea to try it when I found my cell core pipe had 2 tough layers. Each layer was thicker than a thin 2 Liter pop bottle which is pressure rated. Thicker, double wall with cell core in between should at least match a pop bottle. Testing showed this to be the case. Just like a bottle of cola, it doesn't shatter when dropped and holds pressure just fine.
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Unread postAuthor: Gippeto » Tue Jun 05, 2012 4:16 pm

mattyzip77 wrote:You cant get pressure rated 3 inch pipe at Home depot. I think they only have up to 2 inch nsf/pw there. It will clearly say it on the pipe, nsf/pw, or nsf/dwv! You want nsf/pw, not the dwv. dwv is not safe for a pneumatic!!


Might be true in most cases Matty...but if it has a rating on it...that makes it pressure rated wouldn't ya think? :wink:

I know I can go to my local plumbing store and find pressure rated abs DWV too...it's rated for a whopping 50psi, and the rating is printed right on the pipe. :) If I go to another store, they carry pipe by a different manufacturer and it does not have any rating printed on it....go figure.

I think it worthy of some investigation before declaring it unsuited or otherwise....not sure off hand what NSF-PW 3" pvc is rated for...anyone??


Also doesn't make much sense with it being "NFS"...should be "NSF". :?:

Might be he misread the pipe???
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Unread postAuthor: MrCrowley » Tue Jun 05, 2012 4:42 pm

If the pipe is PVC and has NSF-DWV written on it as well as a pressure rating then it is rated for pressure and can be used safely.

http://www.spudfiles.com/spud_wiki/inde ... sure_rated
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Unread postAuthor: mattyzip77 » Tue Jun 05, 2012 6:19 pm

At gippeto , I have had 4 inch dwv blow up on me at 110 psi so I personally will not reccomend anyone to use it. 3 inch nsf\pw sch 40 pipe is rated at 260 psi. For a little extra money its worth getting the good stuff.If its bigger than 2 inch at home depot and is pvc sch 40 its dwv. @ mr.c would you use 3 inch dwv sch.40???[/list]
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Unread postAuthor: MrCrowley » Tue Jun 05, 2012 6:22 pm

If it is 3" NSF-DWV Sch40 PVC with a 230PSI pressure rating on it, yes I would use it. Why not? Matty, you do understand that it has a pressure rating, i.e. that it is rated for pressure; specifically 230PSI.

The DWV part is irrelevant if it has a pressure rating. If I recall correctly, it just means that it can be used for Drain, Waste, Vent applications. Perhaps there's a specific standard that makes DWV pipe favourable over PW pipe in certain applications but I'm unsure of what that standard could be.

This isn't run-of-the-mill DWV pipe, it's DWV pipe with a pressure rating. You're thinking of the typical DWV pipe without a rating that we criticize often.
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Unread postAuthor: mattyzip77 » Tue Jun 05, 2012 7:38 pm

MrCrowley wrote:If it is 3" NSF-DWV Sch40 PVC with a 230PSI pressure rating on it, yes I would use it. Why not? Matty, you do understand that it has a pressure rating, i.e. that it is rated for pressure; specifically 230PSI.

The DWV part is irrelevant if it has a pressure rating. If I recall correctly, it just means that it can be used for Drain, Waste, Vent applications. Perhaps there's a specific standard that makes DWV pipe favourable over PW pipe in certain applications but I'm unsure of what that standard could be.

This isn't run-of-the-mill DWV pipe, it's DWV pipe with a pressure rating. You're thinking of the typical DWV pipe without a rating that we criticize often.


Pressure rated or not, its garbage. dwv, like you said, is used for drain waste venting and its CELL CORE pvc and breaks easily. 9 out of 10 plumbers wont even use it because it constantly breaks and its not worth the hassle in replacing it. If you hold a decent size piece 4 to 5 feet, over your head and drop it on a hard surface its going to break. I would use it for a barrel but thats it. Definatly not a chamber. If you wanna use it, feel free, but I wouldnt. Go to a plumbing supply store and get the good stuff!!
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