On 22/02/2017 16:05, DerbyBorn wrote:
wrote in news:6e07a80c-d49f-477e-ba82-
:

On Tuesday, February 21, 2017 at 7:48:05 PM UTC, Chris Green wrote:

Well basic mistake one to my mind is using PTFE tape with compression
joints. PTFE and compression joints don't mix -

The apprentice uses it without thinking.
The journeyman avoids it without thinking.
The master uses it thoughtfully.


I've never had a problem with it.




It is slapping it onto the treads thinking it will improve the seal that is
so wrong.

Is anyone suggesting that?

The thread is a clamping mechanism. The olive and cones do the
sealing. If these are clean then nothing else is needed.

If... alas not something that can always be relied upon in real life. It
only takes a deep scratch on a pipe that can't be cut back further, and
can't be soldered, or a fitting that must be re-used etc.

Of the many hundreds of compression joints I have made, I have only had
to resort to extra steps to get them to seal a handful of times (in fact
only two or three that come to mind). Can't see the point in rejecting a
solution that works where there is no easy alternative.

(Stand back for
the lubrication comments) Oil could be a good lube,

It could, but given that most plumbing kits will include PTFE, and it
*is* supremely slippery while also being non messy, there is no harm in
using it when necessary IMO.

(or even when not, if you don't enjoy metal to metal squawking - PTFE
also makes compression joists very quiet to tighten)

but too often people
overtighten from the outset. Mauling a joint!

Its actually harder than many imagine - they will usually take fairly
serious over tightening before they actually fail unless you distort the
nuts.

You are more likely to have a problem with poorly fitting spanners, than
too much torque alone.



--
Cheers,

John.

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