Non hardening sealant to 400psi

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vtsteam:
Doesn't a parallel thread usually require a shoulder and washer/gasket/o-ring?

Rob.Wilson:

--- Quote from: vtsteam on April 29, 2013, 10:21:55 AM ---Doesn't a parallel thread usually require a shoulder and washer/gasket/o-ring?

--- End quote ---

It dose :thumbup:

Hi picclock

Personally ,I would not go for tape or any other sealant on a parallel thread as the tread is not designed to seal , tapered threads are , what you need is a face sealing fitting , using a copper /fibber washer , O ring or dowty seal .

From what I can see/read 1/2" BSP too 1/4" BSPT is what you require .

Dowty seal

Good to thousands of PSI :) If you want I can pick one up for you and wack it in the post .

Rob

picclock:
@ vsteam / robwilson

The 1/2" to 1/4" bsp adapters I'm using don't have rim or facility for that. The thread on the adapter is just inside the flat so no shoulder to speak of (22.6mm AF so with thread OD @21mm <1mm either side).

However this Swan Seal stuff (no affiliation) seems amazing . You just apply it and tighten. No setting off time needed (I emailed them and they said immediate seal). Took me about 10 mins to get the part back but it works and seems to make a very good non leaky seal. Also being being ptfe is not likely to dissolve with hydrocarbons. I think its game over unless I find some other issue.

I'm quite blown away by the fact that something that has the same sort of consistency as stag red and the new Hylomar can behave in such a different way. No special treatment, just cleaned the threads and slapped it on - job done. Because of the immediacy of the seal I can easily test and check parts under pressure with no delays wondering if the sealant has cured. :thumbup:

So far so good .. .

Best Regards

picclock

Rob.Wilson:
Good you got it sorted :thumbup:

I would have sent the fitting as well as a few seal , offer still stands if thing dont work out ,just PM me

Rob

picclock:
@RobWilson

Many thanks for your kind and generous offer. For most of this sort of stuff I do use tapered fittings, but I don't have the tooling to cut tapered threads so where I have to make stuff its into a parallel thread. Most of the time, where disassembly is not required I can use Rocol foliac XS, which is hard setting and seems to work well under all sorts of conditions. The downside is it takes an hour or two to cure. Other alternative is low grade epoxy (Lidl £2 per pop) which gives a very good seal but can be removed by heating above 200C (Oven - but she who must be obeyed must never know :bugeye:). But this job I needed to be able to remove and replace easily to service a valve behind the fitting. Hence the need for a soft sealant. If this stuff is as good as it seems to be I may use it exclusively simply because of the speed with which an effective high pressure seal may be made, and its chemical resistances.

Many Thanks

Best Regards

picclock

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