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Steel nipple rating

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Steel nipple rating

Unread postAuthor: iisthemuffin » Thu Aug 21, 2008 12:11 pm

At ace they have steel nipples that are about 2 inch diameter by 1 foot. Its about 6 dollars for a piece like this. Im just curious about using it as a chamber.

Using the nipple would be much easier because the ends are already threaded and would require no welding. I could just screw on my piece and be ready to go.

They have no rating marked on the nipple or on the tag. It just says galvanized steel nipple. It also says SCH 40.

Would this be safe as a chamber at 200 psi? What about 300 or 400?
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Unread postAuthor: Carlman » Thu Aug 21, 2008 12:16 pm

if a soda botle can hold 150...

ive used the 1 inch sel nipple at 300 before
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Unread postAuthor: iisthemuffin » Thu Aug 21, 2008 12:18 pm

The soda bottle thing makes perfect sense. It hadent crossed my mind though. Haha.

Im pretty sure it would be ok to use but i wanted to be sure. And i also wanted to know if anyone else has used one before.
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Unread postAuthor: potatoflinger » Thu Aug 21, 2008 1:15 pm

On Ace's website I remember reading that the nipples are rated to 300 PSI (WOG), and 150 PSI for steam.

That is the same steel pipe that a lot of people make pneumatics and even hybrids out of, so you should be fine.
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Unread postAuthor: SpudFarm » Thu Aug 21, 2008 1:26 pm

i would have no problem to put 700psi in a sch40 steel pipe
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Unread postAuthor: marpat » Thu Aug 21, 2008 2:27 pm

this makes me want to burst test steel pipe
but like spudfarm said i wouldnt hesitate to put 700 psi into the pipe
most steel nipples are welded lengthwise so chances are the metal in the the nipple will fail before the weld because most welding rod is made from a higher grade metal note:im not sure exactly how the friction stir welding process works but i assume that the welds are usually higher strength than the base metal

if you are really worried abot the nipple failing you can order pressure rated ones from mcmaster
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Unread postAuthor: Gippeto » Thu Aug 21, 2008 2:40 pm

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Unread postAuthor: SpudFarm » Thu Aug 21, 2008 3:22 pm

marpat wrote: i assume that the welds are usually higher strength than the base metal


steel becomes brittle after welding, i welder to steel pieces tougether and put pressure on the joint and when it first have bent a tiny bit it is ruined, it will become styrofoam just made of steel.

now that i am done testing with my small hybrid made of those pipes i will send them to Larda for pressure testing
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Unread postAuthor: frankrede » Thu Aug 21, 2008 11:38 pm

SpudFarm wrote:
marpat wrote: i assume that the welds are usually higher strength than the base metal


steel becomes brittle after welding, i welder to steel pieces tougether and put pressure on the joint and when it first have bent a tiny bit it is ruined, it will become styrofoam just made of steel.

now that i am done testing with my small hybrid made of those pipes i will send them to Larda for pressure testing
The steel only gets harder if you cool you piece too fast.
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