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McMaster help.

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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McMaster help.

Unread postAuthor: Pilgor » Sat Feb 23, 2008 9:09 am

when I look at the elbows. It says pressure rated 0 gravity flow. I thought there parts were presure rated.


http://www.mcmaster.com/
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Last edited by Pilgor on Sat Feb 23, 2008 9:22 am, edited 2 times in total.
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Unread postAuthor: Carlman » Sat Feb 23, 2008 9:14 am

link would be nice mate..

EDIT: a link to the elbow in question would be of more use to the homepage...
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Unread postAuthor: Pilgor » Sat Feb 23, 2008 9:34 am

won't let me, the url always stays http://www.mcmaster.com/
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Unread postAuthor: Carlman » Sat Feb 23, 2008 10:47 am

Ok from what I read that would mean it doesn't have a oressure rating and it is for use on gravity related circumstances such as downpipes or gravity feeds, they sell pressure parts and non pressure parts just like any other store that deals in pipe
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Unread postAuthor: D_Hall » Sat Feb 23, 2008 2:47 pm

Pilgor wrote:won't let me, the url always stays http://www.mcmaster.com/

So post the part number. That's easy to search for....
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Unread postAuthor: niglch » Sat Feb 23, 2008 11:39 pm

McMaster doesn't seem to categorize pressure rated PVC parts, so they all show up under the "0 (gravity flow)" category. This, however, does not mean that they aren't rated. According to the McMaster website:
The amount of pressure a pipe fitting can endure is expressed in psi (pounds per square inch). Schedule refers to the thickness of the pipe. Plastic pipe fittings generally do not have pressure ratings, and are rated in Schedule. To maintain the integrity of a system, use the same Schedule pipe and pipe fittings within one system. Schedule 40 is the most common pipe wall thickness, and is great for all-around use. Schedule 80 is a thicker, heavier pipe, designed for use in more demanding applications where pressures run high.
What you really want to watch out for are the parts that are specifically the non-pressure type (Drain, waste, vent or DWV). However, this will be specifically stated in the description of the part. For example, part number 2389K78 is an example of a part you wouldn't want to use because it's not meant for pressure applications. Regular schedule 40 parts will be fine up to pressures of about 130psi.
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Last edited by niglch on Sun Feb 24, 2008 12:13 am, edited 2 times in total.

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Unread postAuthor: MrCrowley » Sat Feb 23, 2008 11:42 pm

PVC fittings do have pressure ratings actually, I have no idea what you are smoking, but please don't PUI.
You should read <A HREF="http://www.spudfiles.com/spud_wiki/index.php?title=Identifying_Pressure_Rated_PVC">this</a>.
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Unread postAuthor: Carlman » Sun Feb 24, 2008 12:00 am

so the people that stamped a pressure rating of 18 BAR on all my pipe and fittings were just messing around and it really doesn't mean a thing :shock:


nhbjnhbekmmd nj,h mdh,bj hdhkmdkhmh ndfshk m fhd

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Unread postAuthor: niglch » Sun Feb 24, 2008 12:02 am

I wouldn't call the information useless, but maybe I wasn't clear. What I meant is that most PVC fittings don't have a specific PSI rating printed on them (a number apparently exists according looking at the wiki page, but McMaster doesn't seem to use it for some reason in categorizing parts) which is why they would appear to fall under an "unrated" category. Obviously there are plenty of PVC fittings which are pressure rated, but the original question here was as to why McMaster wasn't associating the fittings with specific pressures. This is the only reason I can think of.
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Last edited by niglch on Sun Feb 24, 2008 12:07 am, edited 1 time in total.

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Unread postAuthor: Carlman » Sun Feb 24, 2008 12:05 am

niglch wrote:PVC plastic fittings don't have pressure ratings actually, so they all show up under the "0 (gravity flow)" category. This, however, does not mean that they can't handle pressure.
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Unread postAuthor: niglch » Sun Feb 24, 2008 12:09 am

Alright dude, my bad, I'll edit it. However, as far as I can tell, number ratings aren't printed specifically on American PVC fittings (like from McMaster) although you might be able to determine it with a PN number.
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Unread postAuthor: MrCrowley » Sun Feb 24, 2008 12:23 am

What I think you mean is in America the PVC fittings just say NSF-PW etc, that isn't a specific rating. But i'm sure that rating depends on the Sch of the fitting, so you can actually find out the rating of the fitting.

In Aus/NZ the pipe/fittings are stamped with PNXX, where XX is the pressure rating in BAR. 1BAR = 14.5PSI.


@Carlman

Hey my flash animation appears to be spreading, I knew English lessons were good for something :D
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Unread postAuthor: Carlman » Sun Feb 24, 2008 12:38 am

yea good old english, accomplished some good 'work' in that class :D
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Unread postAuthor: jrrdw » Sun Feb 24, 2008 5:49 am

Ok, I have to ask, what does PUI stand for?

I have no idea what you are smoking, but please don't PUI.
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Unread postAuthor: Carlman » Sun Feb 24, 2008 6:41 am

jrrdw wrote:Ok, I have to ask, what does PUI stand for?

I have no idea what you are smoking, but please don't PUI.


Posting under The Influence


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