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Sealing Transition from BSPT to NPT
I ordered a backup prv that I just noticed has bspt threads. I know the threads are cut at different angles. I was wondering if anyone used an extra thick Teflon tape and was successful at achieving a good seal. It won’t be here for 2 weeks,I don’t want to wait if this is a useless endeavor.
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7 Replies
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Blue Loctite works very well for loose fittings or fittings that leak. I would wind a little PTFE tape on the tip of the threads first and Blue Loctite ABOVE the tape. The use of the PTFE tape is to shield the Loctite from the vapor.4″ VM Build
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My part is still not here. I’ll try my thick Teflon tape.
. For the future if this doesn’t work it would be better to use loctite 5400.It’s food safe white label.It’s works up to 150°C.
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On the Loctite 5400 Technical Data Sheet:
I’m not certain, but I interpret the Ethanol line to say “After 100 hours exposure to ethanol at 22C, 95% of initial strength remains”.Please correct me if I’m wrong, but that says to me that this material degrades with exposure to Ethanol, and doesn’t even mention exposure at high temperatures.Neither the TDS nor the SDS say anything about food safe. In fact, the SDS states to not store it with food.I wouldn’t let it anywhere near my still, but that’s just me.HigginsFlute buildSteamer build4 methods experimentAging proof experimentNext batch: Malt Whiskey (60 barley/30 corn/10 wheat)
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Well I wouldn’t either I would rather silver solder it as I’m a cheap bastard. Which is why I mentioned this rather then 2026 an other white label. And I guess if your a serious distiller at 1000 hours you’ll be back at 100%. Working at less than 10 psi I think 95 % will be just fine, at least I had my woman convinced. How quick does flour paste degrade? This was used around the food industry when I was around.
Product DescriptionEngineering can be full of risks, from soldering irons to high voltage electrics, industrial machinery and toxic solvents dangers can be everywhere. Loctite’s Health & Safety Range is a small thing that can make a big difference providing you with the bonding performance that you know and trust for many kinds of metal joining applications but with no hazardous, carcinogenic, mutagenic or reproductively toxic ingredients. No need for hazard symbols, risk/safety phrases or the time & expense of COSHH assessments.In our increasingly safety & environmentally conscious world Loctite Health & Safety Range meets the demands of tough regulations including (EC) No. 1907/2006-ISO-11014-1 meaning that they do not have to be labeled with any hazard symbols, risk or safety phrases. Nor do they contain any declarable CMRs (carcinogenic, mutagenic and reproductive toxins).Outstanding adhesive performance, outstandingly safe.Superior Bonding PerformanceLoctite lead the way in bonding performance and have developed the health & safety range to remove harmful toxins without compromising performance.White LabelNo need for hazard symbols, risk/safety phrases or the time & expense of COSHH assessments.Make Your Workplace SaferEngineering is dangerous enough and Loctite actively supports companies in their efforts to promote health and safety.
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Soldering is definitely the best long term solution if possible.Loctite definitely works great though for uses that do not have contact with alcohol or alcohol vapor. That’s why I mentioned using PTFE tape on the tip of the threads (to block direct contact). I have a 1″ ball valve on a Keggle/kettle and I wanted it clocked in a specific position, but it was too loose. One more turn was not possible. PTFE tape ‘seals’ the joint, but didn’t LOCK it firmly into position. I didn’t want to solder it so tape and Loctite solved the issue. Now it would require a wrench to turn the valve out of position.4″ VM Build
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Maybe use an NPT tap or die and recut the BSPT threads
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Shady I’m putting this together with a toolbox with less than 10 tools. If I can’t put it together with a hammer,die grinder,drill and propane torch it isn’t getting done. Jesse got me started when I saw him do his first silver soldering. I tired of waiting for parts so I silver soldered it to a triclamp,somewhat modular. If I had the patience I could have ordered an adapter to NPT. Getting a new knee in a few weeks,just trying to get most of the work out of the way. Plan on drinking my way thru rehab.Tested the fitting first with 10 psi and soap suds . The thicker Teflon worked.But I’m planning on leaving this to my Godson so I’m trying to make it bulletproof.
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