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British Pipe Threads on Myson Radiator sealing
After three failed attempts with Rectorseal and Blue Monster Tape, I am now seking a better alternative to sealing my Myson radiators located on the second floor of my new build. It sickens me to find these un-tapered threads so hard to seal. I spoke to the USA tech person at Myson and he suggested a few things, most which I have tried. Obviously, sealing parallel non tapered threads can be challenging.
I lasted 4 months since my last attempt before the dripping started after the radiators cooled from their last heating cycle. I have been looking into hydraulic BPT thread sealing devices (retained with a flange nut trapping the seal against the radiator and a sealing nut with o-ring (looks like one is available from China on eBay. I'm planning to start an evaluation once all pieces are in hand. I read this response from a previously closed post:
We now use a couple wraps of heavy teflon (be careful to keep it back from the end of the threads) and then a light smear of LeakLock sealant. We haven't had a leak in the last three years using these particular products and methods. I wouldn't worry about it.
I'm going to explore this LeakSeal product, but think my new approach of installing a sealing device may prove as a better solution. Any suggestions are welcome.
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Something like this to connect my PEX lines.
https://www.grainger.com/category/plumbing/pipe-tubing-and-fittings/tube-fittings/pex-tube-fittings?attrs=Fitting+Connection+Type|PEX+x+Swivel+BSP&filters=attrs
This is the valve with nipple going into the radiator
trainer for Caleffi NA
The magic is in hydronics, and hydronics is in me
https://www.mcmaster.com/bspt-to-npt-pipe-fitting-adapters
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.
Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.
Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
trainer for Caleffi NA
The magic is in hydronics, and hydronics is in me
Or anaerobic sealers like Loctite 272 or 575, or some of the 400 series are also used. Virtually all ball valves are assembled with Loctite type sealers of some sort.
NPT male will go int a BSP female, but without taper on the female you really need string, hemp, or glues (loctite)
BSP male does not work so well going into a NPT female, you will only catch one or two threads, not a very safe connection.
Most euro radiators are BSP female and are machined to accept a cone sealing washer.
The big advantage to BSP straight threads for assembling pipe is your makeup is always spot on, you can stop wrenching when the distance is correct, makes for perfect piping.
With NPT you need to tighten into the taper to seal, and that can vary from fitting to fitting and also the pipe thread itself can vary.
With a massive amount of teflon tape you are increasing the OD and that is not really where the seal issue is, it is in the root of the thread, which is why hemp or string is used, a small amount to provide the resistance in the cut of the thread. Increasing the OD with a gob of TT can split the female fitting as mentioned above if you are not careful.
trainer for Caleffi NA
The magic is in hydronics, and hydronics is in me
trainer for Caleffi NA
The magic is in hydronics, and hydronics is in me
trainer for Caleffi NA
The magic is in hydronics, and hydronics is in me
Does no one use wick anymore? wtf.
"72°F Mechanical, LLC"
Or email John at [email protected]
John is the Boilers and Hydronic Heating Systems Course Instructor at NYC's Mechanics Institute, a professional Master Plumber, licensed by The Department of Buildings of The City of New York, and works extensively in NYC while consulting for clients in and out of state.
John also oversees mechanical installations and maintenance for metro-area clients with his family's company, Gateway Plumbing and Heating along with his brother/business partner.
https://www.argco.com/piping-chemicals/super-dope-anaerobic-thread-sealant.html
https://www.hernon.com/search-for-adhesives/459/Dripstop 923
Loctite 272 or 575, or some of the 400 series that Hot Rod mentioned use the same anaerobic action to make the seal.
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I've been told that it's a no no but I've had success with greasing female threads while doping male.
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Hydronics Designer
Hydronics is the most comfortable and energy efficient HVAC system.
It’s a daily task fitting & connecting British/European radiators, so if it’s for shear numbers I should know my onions!!
The radiator threads are BSPT, which means they’re tapered threads & therefore will only seal successful with a BSPT Male thread.
Generally we use Lockshield & Thermostatic radiator valves, all of which have BSPT ‘tails’ on them. To seal them we’d use PTFE(Teflon tape), Locktite 55 or more recently, anaerobic glue.
You’ll find it difficult, if not impossible to join BSPT to BSPP threads, so that maybe your difficulty.
I purchased Myson rads and the supply house called me and said you did not order valves are you aware those require special valves the thread is not US standard. I said yes I will order them later thank you for calling to warn me I am aware of that!
> I remember the salesman from Sommerville told me to uise "X" amount of wraps with teflon tape. No more no less and that was at least 10 years ago. No leaks. Some times it's easy just to ask the guy that sold it to you.
What quantity is that and what thickness tape?
For the most part manufacturers assemble with Loctite type products that glue the partsJust need to determine how permanent you want the connection to chose the type of thread sealant/ glue
I don’t think tefelon tape works with the Loctite glued?
trainer for Caleffi NA
The magic is in hydronics, and hydronics is in me