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Short question topic

A place to ask general spud cannon related questions.
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Re: Short question topic

Unread postAuthor: hectmarr » Sat Sep 07, 2019 2:38 pm

Does anyone know how much pressure I can use in this mapp gas can?
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Re: Short question topic

Unread postAuthor: mrfoo » Sun Sep 08, 2019 5:06 am

IIRC, it's marked on the cans. Not very much, as I recall, somewhere around 22 bar, I was looking at one I have lying about the other day. I'll have a look in a bit.
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Re: Short question topic

Unread postAuthor: hectmarr » Sun Sep 08, 2019 9:09 am

The one they gave me has no label or inscription of any kind. I've searched the web, but the data is elusive. They only talk about the characteristics of gas for welding :roll:
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Re: Short question topic

Unread postAuthor: mrfoo » Sun Sep 08, 2019 11:22 am

OK, just had a look. The cans themselves aren't stamped. Label states 22 bar for the contents, so you're almost certainly safe up to there. That's for the old-style MAPP canisters with methylacetylene-propadeine rather than the less energetic propylene-propane mix they use these days.

Those cans do come with a handy fill valve that you're obviously not supposed to use.
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Re: Short question topic

Unread postAuthor: hectmarr » Sun Sep 08, 2019 12:09 pm

OK understood. I'm just going to inflate to 200 psi, no more, it has to endure well. Thanks for your reply.
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Re: Short question topic

Unread postAuthor: jackssmirkingrevenge » Tue Sep 10, 2019 7:23 am

hectmarr wrote:OK understood. I'm just going to inflate to 200 psi, no more, it has to endure well. Thanks for your reply.


MAPP gas has a vapor pressure of around 200 psi at 30 degrees celcius so you should be more than fine at this pressure.

PDF report of these bottles being abused in the name of health and safety

If I understood correctly, working pressure for the MAPP bottle is listed as 13 bar or 189 psi.
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Re: Short question topic

Unread postAuthor: hectmarr » Tue Sep 10, 2019 9:12 am

Good report Thanks Jack.
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