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Using BSP and NPT fittings

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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Using BSP and NPT fittings

Unread postAuthor: Night Hawk » Thu Jun 11, 2009 1:11 pm

Ok guys is it ok to use BSPP and NPT fittings together? There is a 5 degree pitch different but ive heard that this is not a problem, but im not sure at pressues of about 8bar?

The sizes i would be using would be 3/4" and 1/4". Any knowladge would be helpfull.

Thanks

NH
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Unread postAuthor: psycix » Thu Jun 11, 2009 2:18 pm

Officially: no.
But you could. They are semi-compatible. Some sizes have the same pitch and work better together then others. Main difference is the shape of the threads.
Crossing them over does not guarantee a leak-free joint. It may also differ per manufacturer.

Here is a link with some nice information:
http://www.colder.com/Portals/0/pdfs/NPT.pdf
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Unread postAuthor: jonnyboy » Thu Jun 11, 2009 3:13 pm

I would say if your dealing with pvc and Teflon tape it COULD work. But if your dealing with metal I would say it's a no go.
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Unread postAuthor: Biopyro » Thu Jun 11, 2009 3:26 pm

What are you threading together. If you haven't (or even have) already bought it, we might be able to suggest an alternative.
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Unread postAuthor: Night Hawk » Thu Jun 11, 2009 4:02 pm

I found my alternative, the page before in the catologue was stuck to this page and has all the bspp fittings :)

Thanks though!
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Re: Using BSP and NPT fittings

Unread postAuthor: Ragnarok » Thu Jun 11, 2009 4:04 pm

Theoretically, you can buy converting fittings for the threads if you want to be really sure.
Airlines do them up to 1/2" size here, you might be able to find 3/4" somewhere else.

NPT male/BSPT male
NPT male/BSPP female
BSP male/NPT female

Then again, I've run sizes that really aren't supposed to be mixed before. A common one is mixing 1/2" BSPP and 15mm compression threads - with healthy amounts of PTFE tape.
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Unread postAuthor: Night Hawk » Thu Jun 11, 2009 5:28 pm

Cheers but yeah i found all bsp threads on the previous page :P i feel so silly.
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Unread postAuthor: far_cry » Thu Jun 11, 2009 6:53 pm

possibly you will be with leak problem
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