Replacing hose on regulator...what lubricant to use for threads? Urgent!

[Papasmurf89]

Hey guys,

I'm going to be replacing my hose tomorrow so I want to buy the necessary gear today. What kind of lubricant should I be using on the hose threads before I screw them in?

Thanks!

 

[uncfnp]

The orings on the hose to the regulators are static so no lube required.

BTW. When lube is needed, like on the SPG spool, the lube goes on the orings not the thread.

 

[Papasmurf89]

So I won't need any lubricant for installing the hose? Thanks!

 

[boulderjohn]

You are correct.

 

[tbone1004]

and more importantly, don't lube the threads.... that's bad, much more prone to coming undone that way. I still lube all of the o-rings lightly, but if you don't have any of the appropriate lube, then there is nothing wrong with installing them dry since they are static.

 

[Nasser]

A little lubricating of the 0-rings does help them to sit a better and not twist or make an improper seal. Christo-Lube is good and is O2 friendly.

 

[Aguablanco1]

I much prefer Crisco Lube. And you can cook with it. Seriously though, and not meaning to be too sarcastic, how many other things with threads do people lube before screwing them in? Most importantly, don't over tighten that connection. The O-ring makes the seal.
RichH

 

[BRT]

Want another opinion. I use lube on every threaded connection and every o-ring. That thing about them not coming loose? Yeah, they might not the next time. I've taken apart the ones with lube and the ones without after years. The ones with come off. I use silicone grease. Christolube would be fine too if you are really worried about oxygen in breathing mixes, but I'm not up to the 36% I dive.

I own a tire store. We antisieze every lug. If our customers then go to the local Les Schwab they are told it will cost $100 to get that lube off, that lug nuts should never be lubed. One of my employees is a former employee of that Les Schwab and he really didn't want to use lube. After a few years he mentioned to me that our customers had almost no broken studs. Lube makes things tighten down better and come off easier. That o-ring that "doesn't move" in there actually compresses everytime you pressurize your reg. That is how it makes the seal.

Lubricant on studs is bad for the stud replacement business though.

 

[halocline]

Don't lubricate the threads on regulator hoses.

 

[herman]

The orings on the hose to the regulators are static so no lube required.

BTW. When lube is needed, like on the SPG spool, the lube goes on the orings not the thread.

I haven't kicked this dead horse in a while so I will again.

Hose orings are not static by definition and therefore do require lubrication for assembly. While it is true they are static in service, they are not when being installed. To meet the definition of a static seal, the mating (sealing)surfaces must NEVER move past/ slide against the oring and since the hose orings move past the sealing surfaces both in rotation and linearly during assembly, they are by definition dynamic, not static. There are very few true static seals used in scuba, the yoke tank oring being one of the few that meet the criteria for being a static oring. Can you get away with not lubing them, most of the time yes and in reality if the connection is not new/ O2 cleaned, odds are there is some residual lube there anyway. I spent a lot of time reading and educating myself about oring seals years ago.

I will also disagree on lubing the SPG threads. The lube helps prevent corrosion and stops a lot of water intrusion into the threads, again reducing corrosion.