O/A fitting threadlocker?

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I posted a thread a while back about a couple of O/A welding kits I have.  One kit has the small bottles int he red plastic carrying case, the other kit has regs for the larger bottles that won't fit the small bottles.  I went out to the workshop today and managed to swap the hose fittings from the large bottle regs to the smaller regs so I can attach the larger hoses from the working kit to the small bottles.The question I have is this:  The hose fittings appeared to have some sort of thread locker or sealer around the threads where they screw into the regulators.  It appeared to be red thread locker.  Should I get some red thread locker and put on the threads or use some other type of sealant?  I'm hesitant to put anything at all on the threads of the fitting that screw into the Oxygen regulator, but I'm also a bit worried about leaks.Any thoughts?
Reply:I would use Stag paste.  It is used for gas, oil and pressure fittings.Not sure, but normal thread lock of stud lock might be sufficent.  The pressure on the outlet is not that great.
Reply:try tfelon paste. i always spray my regs with soap solution where they connect to the tank and the hoses after i.ve tightened things up just to be sure...
Reply:******For oxygen fittings, a thread sealant that is approved for oxygen needs to be used.'Oxygen-approved' sealants are available.Most thread sealants are not, including most teflon pastes, since they containsome form of hydrocarbon.       Basic Chemistry 101---O2 + hydrocarbon = fire/explosionBlackbird
Reply:I use blue Loctite #242 so the fiitings are easily removed if nessessary.  tefon tape works also.OAdoctorwww.regulatortorchrepair.com
Reply:Ditto the blue Loctite, you can remeove it without heat should the need arise. Teflon tape I find loosens up especially on something that you're constantly moving around like a regulator...Mike
Reply:Originally Posted by dave powelson******For oxygen fittings, a thread sealant that is approved for oxygen needs to be used.'Oxygen-approved' sealants are available.Most thread sealants are not, including most teflon pastes, since they containsome form of hydrocarbon.       Basic Chemistry 101---O2 + hydrocarbon = fire/explosion
Reply:Never have actually used any sealant on regs, hoses, or other fittings.All fittings on a cutting rig are compression, or O ring fittings which properly seal with the correct torque.  I suppose if you have a bad seating surface you'd be forced to replace the particular component.  Overtightening ruins the majority of these fittings.  Worst are exchange bottles  Guys always use 6 foot cheater bars to tighten the regulators"Any day above ground is a good day"http://www.farmersamm.com/
Reply:All fittings on a cutting rig are compression.....
Reply:Oh Crud!! I was just thinking of hose and bottle fittings, and the fittings on the handleI totally ignored the guage fittings and inlet fitting.  I've never had to replace a guage, and usually used an adapter to fit different size bottles when I converted from teeny weeny bottles at first.Stick Radishes in my nose, and slap me silly(^%^^&^$@$^) Attached Images"Any day above ground is a good day"http://www.farmersamm.com/
Reply:Locktite, as well as several other manufacturers, make high tech thread sealants, non-aerobic curing  (there's a word for this, "anearobic"????)    Whatever, somebody can probably set me straight here.   In any case, it's not a thread-locker, it's a very good thread sealant, only need one or two drops.   Use it all the time, on hydraulic systems, where tapered pipe threads are used.   In any case, as Mr. Powelson stated, be sure, it's approved for oxygen service.   Most common I see, is teflon tape, just a couple wraps, not sloppy where a little can break loose and plug the lines.   I believe, the pink colored teflon tape is oxygen safe, although even from the factory or rebuilders I see mostly white teflon tape.Last edited by jsfab; 12-27-2009 at 05:01 PM.
Reply:Stick Radishes in my nose, and slap me silly
Reply:Originally Posted by mrmikeyLookin fer volunteers . (sorry Samm, couldn't resist)....Mike
Reply:Soapy water to check for leaks, some of this stuff, tapered pipe thread was designed before their was anything common to use for plumbing leaks.
Reply:I was thought never use any thing on O/A threads. Torque slightly, if brass squeaks thats enough. Check with soapy water, have used windex. If leak is present, then pursue sealants.Miller TrailBlazer 251Miller HF-250-1Miller MaxStar 150 STLHyperTherm PowerMax 380 plasmaLincoln PowerMig 180Millermatic 252Miller Diversion 180