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| snowjack |
 Posted: 01/22/2007 19:44 PM Post subject: Stuck NPT fittings |
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Private
Joined: 01 Jan 2007
Posts: 9
38.33 Spud Bux
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| Probably a noob question. I'm almost done building my first gun, but I'm having trouble with the threaded fittings. The male fitting is NPT Sch80 PVC, and the female fitting is NPT Sch40 PVC (this is for a combustion gun, I couldn't find the male fitting I needed in Sch40). Anyway, I can't get the male fitting to go in all the way. It gets tighter as it goes and gets stuck about 2/3rds of the way in. Both the male and female are supposed to be tapered threads according to McMaster (straight is NPS instead of NPT, right?). On Burnt Latke's site he recommeded filing down the little imperfections in the thread seams, but that doesn't seem to have helped. I also tried lubricating the threads with a little WD-40 but that didn't help either. Any suggestions? |
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| squeaks |
| Posted: 01/22/2007 19:48 PM Post subject: |
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Captain
Joined: 01 Oct 2006
Posts: 329
466.29 Spud Bux
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hahahahaha............sorry, had to laugh at this one.
NPT fittings are supposed to get tight until the point where you can't turn them anymore. This is so that a proper seal can be acquired. It's perfectly fine to have some of the threads not being used. Just remember to teflon the threads. |
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| Bluetooth |
| Posted: 01/22/2007 19:54 PM Post subject: |
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Brigadier General
Joined: 27 Jun 2006
Posts: 828
34.79 Spud Bux
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| Yeah, if you get it all the way in your not getting it back out. Lol |
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| garrettee |
| Posted: 01/22/2007 19:57 PM Post subject: |
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Master Sergeant
Joined: 22 Dec 2006
Posts: 174
2.17 Spud Bux
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| Take it easy squeaks, If you knew it all when you started you wouldn't be here right now. That's what this forum is for, right? |
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| MrCrowley |
| Posted: 01/22/2007 19:59 PM Post subject: |
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Blizzard of Ozz
Joined: 23 Jun 2006
Posts: 6137
3165.90 Spud Bux
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2/3rds aint bad, if it blows off dont blame us  |
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| squeaks |
| Posted: 01/22/2007 20:24 PM Post subject: |
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Captain
Joined: 01 Oct 2006
Posts: 329
466.29 Spud Bux
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| I was taking it easy. That's why I was enjoying this moment for some comic releif. Yeah, I knew about just as much when I first started. Then I discovered the joy of the forum search key and spudwiki. Two lifesavers. |
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| snowjack |
| Posted: 01/22/2007 22:34 PM Post subject: |
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Private
Joined: 01 Jan 2007
Posts: 9
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| squeaks wrote: | | I was taking it easy. That's why I was enjoying this moment for some comic releif. Yeah, I knew about just as much when I first started. Then I discovered the joy of the forum search key and spudwiki. Two lifesavers. |
No harm, no foul. But just for the record I did spend about an hour searching the forums, reading, and going through the Wiki, and didn't see anything mentioned about stuck threaded fittings.
Actually, all together I've probably spent three or four hours reading through the forums here, and I think I saw more posts about forum etiquette, grammar, and spelling than about spudguns... 
Anyway, thanks for the sanity check, everybody.  |
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| squeaks |
| Posted: 01/22/2007 22:45 PM Post subject: |
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Captain
Joined: 01 Oct 2006
Posts: 329
466.29 Spud Bux
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| Yeah, we are a bit nutz here about grammar and whatnot. In fact, just by typing this message someone will proofread me and fix any and all spelling/grammar errors. That or they will make fun of me for whatever dumb reason I'm posting this message. That's half of the fun of the forum. |
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| A-98 |
| Posted: 01/22/2007 23:07 PM Post subject: |
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Pussy Lover
Joined: 27 Apr 2006
Posts: 907
135.08 Spud Bux
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ugh. you spelled "nuts" wrong!!!
lol, jk
ya, when i first started i thought that you had to get them almost all the way in...but then i realised that that wast possible.lol. |
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| Pete Zaria |
| Posted: 01/22/2007 23:16 PM Post subject: |
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Resident Computer Guru
Joined: 31 Mar 2006
Posts: 962
914.67 Spud Bux
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Snowjack,
Two strap wrenches (like these:  ) work wonders on stuck threaded fittings.
I don't know if they'd shrink at all if you put them in the freezer to get them cold - it might help, and I don't think it could hurt them...
Peace,
Pete Zaria. |
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| snowjack |
| Posted: 01/23/2007 10:32 AM Post subject: |
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Private
Joined: 01 Jan 2007
Posts: 9
38.33 Spud Bux
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| That should work. Thanks, Pete! |
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| jrrdw |
| Posted: 01/23/2007 13:00 PM Post subject: |
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Donating Moderator
Joined: 16 Nov 2005
Posts: 3278
5111.40 Spud Bux
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Helpfull hint --
After you get it out of the freezer, try a hair dryer on the out side of the female fitting, that will make it even easier to unscrew. |
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