How do I seal NPT threads for Oil Sandwich?
Hi everyone,
I just got an oil cooler sandwich adapter with 3/8 NPT inlet/outlet. I got 3/8 NPT to -AN 8 fittings. What is the best way to seal up the thread on the NPT? I heard Oil will eat away at Teflon tape. Thanks for the help. |
Here's the jist of it. NPT is tapered pipe threads. They have slightly different tapers as to cause them to seal when they meet. The teflon serves as a lubricant to allow the fittings to get much tighter than they would without it. As you tighten the shit out of it, the two tappers meet each other and the metals deform, crush-sealing against one another. Once they crush 360* around the threads, you now have 100% metal to metal seal that won't ever leak. No seals to blow, no gaskets to leak or blow, no sealant to leak. It's metal to metal sealing.
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um just srew em together no teflon or oil needed as pat said the metal seals on itself.
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Originally Posted by magnamx-5
(Post 371798)
um just srew em together no teflon or oil needed as pat said the metal seals on itself.
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ARP makes a special sealant goop for tapered pipe threads. IMO it works much better than teflon tape. i got some from summit a while ago.
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I typically use teflon paste.
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yeah on I remember reading on Injector Rehab that NPT use Teflon and AN don't...
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tapered threads get the sealant, compression fittings dont need it.
and teflon should be ok with oil... UNLESS you get it in the oil path and clog your shit. that's the big problem. if you do use teflon tape, keep it away from the openings. you can also get that goop you put on and let dry first. mcmaster probably has it. |
What about that thick yellow teflon at home depot? The label says it's design for petroleum product, which I assume is meant for natural gas and propane lines.
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This stuff works awesome.
THREAD SEALANT, TEFLON, HIGH TEMP - 034 MOTORSPORT The rest of the chemicals they sell are also the best I have ever used. |
Regular NPT fittings actually won't fully seal if you don't use some sort of tape or sealent, there is a gap between the crast and root of the threads that creates a spiral leak path. An NPTF fitting on the other hand will fully seal.
National pipe thread - Wikipedia, the free encyclopedia Swagelok SWAK works very well, and there isn't the same danger of a chunk of tape coming free from the inside of the seal and going through your system. MS-PTS-6 - SWAK® Anaerobic Thread Sealant, 6 cm3 Tube |
Originally Posted by matttheniceguy
(Post 374673)
Regular NPT fittings actually won't fully seal if you don't use some sort of tape or sealent, there is a gap between the crast and root of the threads that creates a spiral leak path. An NPTF fitting on the other hand will fully seal.
National pipe thread - Wikipedia, the free encyclopedia Swagelok SWAK works very well, and there isn't the same danger of a chunk of tape coming free from the inside of the seal and going through your system. MS-PTS-6 - SWAK® Anaerobic Thread Sealant, 6 cm3 Tube |
i've had good luck with the thread sealant i got at pepboys or autozone or somewhere. it's in a white little tube and is rated for hydraulic use.
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Originally Posted by dynokiller90
(Post 374792)
realy? that must be why every suspension setup I've ever built with air bags , hydros or nitrogen never leaked. if new fittings are installed properly they should not leak at all. It's all about the deformation of the threads that seals them.
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I agree with you, the problem is most people don't know how to use the "sealants" properly. especialy teflon tape. which I reserve only for steel threads. I think most people would be better served getting a good seal in automotive applications by using new fittings and actualy running them in far enough to make a good seal rather than gooping on "sealant" or wrapping them with twenty turns of tape in the wrong direction.
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