Quick one really - When fitting a 1/2" into a wall plate, do I need to put
anything on the thread first (like PTFE), or is this not necessary.

Cheers

Kevin

"Kevin Brady" wrote in message

Quick one really - When fitting a 1/2" into a wall plate, do I need to put
anything on the thread first (like PTFE), or is this not necessary.

Why not use it?

I'd always use PTFE tape personally, costs a few pennies and ensures a leak
free joint.

Dave

David Lang wrote:

Quick one really - When fitting a 1/2" into a wall plate, do I need to put
anything on the thread first (like PTFE), or is this not necessary.


Why not use it?

I'd always use PTFE tape personally, costs a few pennies and ensures a leak
free joint.


It's far better to understand the purpose of PTFE in a joint and use it
accordingly than to just use it on every joint.

In this case, it's a parallel thread joint, which will require some kind
of sealant to make it water tight. PTFE (or alternative) is therefore
required.

However, there are many other types of joint where the seal is created
in a different way (metal/metal, metal/rubber etc.), and using PTFE in
those situations is neither desirable nor recommended.


--
Grunff

On Wed, 03 Aug 2005 09:43:02 +0100, Grunff wrote:

However, there are many other types of joint where the seal is created
in a different way (metal/metal, metal/rubber etc.), and using PTFE in
those situations is neither desirable nor recommended.

I guess most people wouldn't use it on soldered joints. :-)

Are you saying that it is not appropriate for compression joints?

Mr F.

Mr Fizzion wrote:

Are you saying that it is not appropriate for compression joints?

Yes, among others.


--
Grunff

In article , "Grunff"
says...
Mr Fizzion wrote:

Are you saying that it is not appropriate for compression joints?

Yes, among others.

But it can be a good quick bodge on a dodgy compression joint, at
least until you fix it properly.

"Grunff" wrote in message

Are you saying that it is not appropriate for compression joints?

Yes, among others.

I've always used it on compression joints, including high pressure fittings
on CDS hydraulic tube @ 200 bar+ and I've never had a leak yet.

Dave

"Mr Fizzion" wrote in message
...
On Wed, 03 Aug 2005 09:43:02 +0100, Grunff wrote:

However, there are many other types of joint where the seal is created
in a different way (metal/metal, metal/rubber etc.), and using PTFE in
those situations is neither desirable nor recommended.

I guess most people wouldn't use it on soldered joints. :-)

Are you saying that it is not appropriate for compression joints?

Mr F.


Yes. I have never used (or needed) any form of sealant in a compression
joint. If the olives don't seal it then there is something wrong, like grit
in it.

Alan.

Thanks for all responses

Ok - PTFE tape on the shopping list for use where a threaded connection
ITSELF is making the seal - i.e. Bib tap as per my original post.

Incidently - the Hep20 website suggests using the tape beneath the olive of
a compression joint to help lubrication , but not to seal the joint.

Regards
--
Kevin B, Oxford
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