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Just a little thing that has been nagging at me...

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Just a little thing that has been nagging at me...

Unread postAuthor: Intel Xeon » Thu May 03, 2007 9:48 pm

I use pipe from Charlotte pipe, which is very good quality pipe. I also use fittings from Lasco, also exceptional quality. Now, every person who has warned people from not using dwv parts has mentioned that your fittings should have a psi rating on them. Not so here. Why?
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Unread postAuthor: pyrogeek » Thu May 03, 2007 10:01 pm

It's hard to find fittings with pressure ratings. Sometimes you can tell by their design if they are meant for DWV applications though.
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Unread postAuthor: benstern » Thu May 03, 2007 10:23 pm

Most fitting do not have pressure ratings on them.
Judge them by the thickness, quality, and weight to see if they are dwv.
If needed ask a pipe expert or us.
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Unread postAuthor: meatballs » Thu May 03, 2007 10:43 pm

It's hard to find fittings with pressure ratings. Sometimes you can tell by their design if they are meant for DWV applications though.


what sort of things would you look for in the design? i know to look for how far a pipe will slide into the fitting, is there anything else?
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Unread postAuthor: frankrede » Thu May 03, 2007 11:09 pm

fittings should have nsf-pw on it.
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Unread postAuthor: Intel Xeon » Fri May 04, 2007 6:59 am

Obviously, I know to use pressure rated parts. all Lasco parts have the astm and nsf ratings on them. I was just curious whether they should have an actual psi rating or not.
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Unread postAuthor: subterranean » Fri May 04, 2007 5:26 pm

"NSF-PW" is pressure rated. The guy at my local plumbing supplier sold me a peice that said NSF-61,he says will hold high pressures. so any fittongs with those markings on them are good choices. NSF-dwv is to be avoided.
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Unread postAuthor: frankrede » Fri May 04, 2007 5:34 pm

nsf-dwv is to be ignored/
Some pressure pipe has has DWV on it too.
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Unread postAuthor: subterranean » Fri May 04, 2007 9:20 pm

well thats not all true, when it comes to pipe, yes some pipe labled nsf-dwv will also has a pressure rating printed on it. If you look closly, a little farther down the pipe there will be an nsf-pw marking as well.(this pipe is made for both pressure and drainage applications) when it comes to fittings, nsf-dwv is NOT the same as nsf-pw, it is made differently and should not be asumed as "ok" for a pneumatic. only if you decide to keep the pressure below 80psi, dont use nsf-dwv fittings.
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Unread postAuthor: frankrede » Fri May 04, 2007 10:54 pm

subterranean wrote:well thats not all true, when it comes to pipe, yes some pipe labled nsf-dwv will also has a pressure rating printed on it. If you look closly, a little farther down the pipe there will be an nsf-pw marking as well.(this pipe is made for both pressure and drainage applications) when it comes to fittings, nsf-dwv is NOT the same as nsf-pw, it is made differently and should not be asumed as "ok" for a pneumatic. only if you decide to keep the pressure below 80psi, dont use nsf-dwv fittings.
Now was that directed towards me?
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Unread postAuthor: subterranean » Sat May 05, 2007 2:21 pm

not really, it was just a response to your reply. I wanted to help clarify what you were talking about, so the person who created this thread would understand it better.
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Unread postAuthor: Intel Xeon » Sat May 05, 2007 5:57 pm

Despite what persona I may have created thus far, I am not an idiot. I have stated time and again that I understand the National Sanitation Foundation's markings. The question was a simple bout of curiosity as to whether my fittings should be marked with a rating of specific Pounds per Square Inch.

benstern has already answered this curiosity-induced question. Thank You. :D
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