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Overtightened NPT Threads

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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Overtightened NPT Threads

Unread postAuthor: lava98 » Tue Sep 18, 2012 11:22 am

Help! I have a 1.5" pneumatic aluminum spud gun, but I think I screwed on the pipes a bit too tight... There are 3 threads left visible on the male threads and I'm scared it is too tight and will go BOOM in my hands. They are aluminum 1.5" pipes and fittings from mcmaster.com

Thanks a lot guys!
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Unread postAuthor: jackssmirkingrevenge » Tue Sep 18, 2012 11:31 am

Photos? Doesn't sound like it should be a problem.
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Unread postAuthor: lava98 » Tue Sep 18, 2012 11:34 am

I will upload some photos tomorrow. It is pretty late right now, and I got school tomorrow. Thanks :)
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Unread postAuthor: Zeus » Tue Sep 18, 2012 4:30 pm

I thread steel fittings unti they bottom out, not a problem.
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/sarcasm, /hyperbole
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Unread postAuthor: D_Hall » Tue Sep 18, 2012 9:13 pm

ALUMINUM?

Is that for both the male and the female?

Did you use any thread lubricant?

If the answers to those last two questions are "yes" and "no" respectively, you're probably up against galling. Things may be fine, but be advised that your threats are likely almost literally welded together. Unscrewing those parts will likely destroy them.

Blah blah blah.

In the future, use lube.
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Simulation geek (GGDT / HGDT) and designer of Vera.
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Unread postAuthor: mattyzip77 » Wed Sep 19, 2012 7:50 am

always make threaded joints snug not tight any plumber will tell you the exact same thing
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Unread postAuthor: lava98 » Wed Sep 19, 2012 12:36 pm

Sweet I just welded my fittings and pipes together! Jokes aside, i'm happy as long as the thing won't cone apart in my hands... :lol:
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Unread postAuthor: Ronin » Fri Sep 21, 2012 4:15 pm

I hope this doesn't breech proper posting (ediket)oops mean manners.
I couldn't find a simimilar thread.can one combine brass fittings with PVC pipe and fittings?I have a PVC cleanout I reduce down to 1" threaded female end and I got a really "spiffy"threaded brass plug that I think would be functional and cool looking.but is there some variables I don't know about that would make that not a good combination?
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Unread postAuthor: Zeus » Fri Sep 21, 2012 7:34 pm

D_Hall wrote:
Is that for both the male and the female?

"almost literally welded together. Unscrewing those parts will likely destroy them."

Blah blah blah.

In the future, use lube.


I've had that problem many a time.
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/sarcasm, /hyperbole
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