McMaster help.

[Pilgor]

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


http://www.mcmaster.com/

[Carlman]

link would be nice mate..

EDIT: a link to the elbow in question would be of more use to the homepage...

[Pilgor]

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

[Carlman]

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

[D_Hall]

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

So post the part number. That's easy to search for....

[niglch]

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.

[MrCrowley]

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/inde ... C">this</a>.

[Carlman]

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


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[niglch]

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.

[Carlman]

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.

[niglch]

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.

[MrCrowley]

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

[Carlman]

yea good old english, accomplished some good 'work' in that class

[jrrdw]

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

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

[Carlman]

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