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PN and SCH walls

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PN and SCH walls

Unread postAuthor: SpudFarm » Sun Apr 06, 2008 4:57 pm

i live in norway and we got PN ratings.
the thing i have a problem with is that when people are making things out of steel like a hybrid.

to bring it up a understandable way:
if i make a thread that is about what the minimum for a steel hybrid is, everyone says i am fine with a SCH 40 pipe but that is the same as asking a dog for the answer for me.

what i want to know if the wall thickness of steel pipes. from 0" SCH0 to 8" SCH160. that means that if you got a steel pipe that you know the diameter and SCH rating of you can post like this " 3" SCH 40 has a wall thickness of ....."
if every member that has a steel pipe lying around gives me that information i can write it down and use it later. i think i can get pretty many diameters and SCH ratings from everyone ;)


THANKS
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Unread postAuthor: Hubb » Sun Apr 06, 2008 5:00 pm

This link has some good info.
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Unread postAuthor: POLAND_SPUD » Sun Apr 06, 2008 8:58 pm

hmmm PN is a pressure number.. I don't think it is the same thing as for example SCH40 becase PN is only a pressure rating while SCH refers to size (wall thickness) of pipes

do I get it right?
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Unread postAuthor: MrCrowley » Mon Apr 07, 2008 12:08 am

Yeah POLAND is right, but the higher the PN the larger the thickness.
I'd say PN15 is a minimum for a hybrid, but i'd try and get PN18 or PN21 if you can.

At 10X you'd want atleast PN18. PN12 and PN15 would be fine for 6x and under.
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Unread postAuthor: DYI » Mon Apr 07, 2008 4:57 pm

At 10X you'd want atleast PN18. PN12 and PN15 would be fine for 6x and under.


:shock:
PN18 = 18 bar pressure rating, ~54 bar burst pressure
PN21 = 21 bar pressure rating, ~ 63 bar burst pressure
Adiabatic 10x propane air = ~90 bar

You may run into a small problem involving copious amounts of concussion and shrapnel if you follow that advice...

And spudfarm, I'll send you a link on MSN that shows the wall thicknesses of pipes from 1/8" SCH 10 to 24" XXS, and up to 48" SCH 80, all on one convenient chart.
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Unread postAuthor: MrCrowley » Mon Apr 07, 2008 11:20 pm

DYI wrote:
At 10X you'd want atleast PN18. PN12 and PN15 would be fine for 6x and under.


:shock:
PN18 = 18 bar pressure rating, ~54 bar burst pressure
PN21 = 21 bar pressure rating, ~ 63 bar burst pressure
Adiabatic 10x propane air = ~90 bar

You may run into a small problem involving copious amounts of concussion and shrapnel if you follow that advice...

Just occurred to me I don't know the metal rating in metric, I instinctively wrote those as PVC ratings. :oops:

I'm not even sure if I've seen metal pipe rated in the PN system...
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Unread postAuthor: POLAND_SPUD » Tue Apr 08, 2008 7:28 am

valves and fittings have PN ratings... steel pipes usually don't have it written on them or you have to find it on manufacturer's site
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Unread postAuthor: SpudFarm » Tue Apr 08, 2008 9:03 am

don't think of the PN. just give me some walls at SCH ratings and i can messure on my pipes as a comparison.
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