When using compression fittings on copper pipe I've always hand-tightened plus half a turn. I think it was just a rule of thumb taught to me by my Dad.. I was wondering, however, how tight I should make a compression fitting to plastic pipe - more/less/same? My intuition is saying it should be the same.

If it makes any difference the pipe in question is 15mm Hep2O barrier pipe and I am connecting to a TRV. Incidentally, I am aware of the importance of using an insert.

On 15/04/2019 21:29, Mathew Newton wrote:
When using compression fittings on copper pipe I've always
hand-tightened plus half a turn. I think it was just a rule of thumb
taught to me by my Dad. I was wondering, however, how tight I should
make a compression fitting to plastic pipe - more/less/same? My
intuition is saying it should be the same.

If it makes any difference the pipe in question is 15mm Hep2O barrier
pipe and I am connecting to a TRV. Incidentally, I am aware of the
importance of using an insert.

IME, its a similar "feel" to compression on copper.


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

On Tuesday, 16 April 2019 11:24:15 UTC+1, John Rumm wrote:

IME, its a similar "feel" to compression on copper.

Thanks John, that's good to know. I suppose even though the pipe might be plastic it still has rigidity from a metal insert.

I did read somewhere that a copper olive should be used, as opposed to a harder brass one, so that should help with the feel.

On 15/04/2019 21:29, Mathew Newton wrote:

If it makes any difference the pipe in question is 15mm Hep2O barrier pipe and I am connecting to a TRV. Incidentally, I am aware of the importance of using an insert.


The person who invented the name 'Hep2O' took the end of my finger off
in 1953.

Bill

On 15/04/2019 21:29, Mathew Newton wrote:
When using compression fittings on copper pipe I've always hand-tightened plus half a turn. I think it was just a rule of thumb taught to me by my Dad. I was wondering, however, how tight I should make a compression fitting to plastic pipe - more/less/same? My intuition is saying it should be the same.

If it makes any difference the pipe in question is 15mm Hep2O barrier pipe and I am connecting to a TRV. Incidentally, I am aware of the importance of using an insert.

horse it up as hard as you can ........no kidding

--
Report a bad lying Freemason to Mr Baker of UGLE Audi Vide Tace

On Tuesday, 16 April 2019 15:54:47 UTC+1, Bill Wright wrote:

The person who invented the name 'Hep2O' took the end of my finger off
in 1953.

Oh, right!

Did he explain why the name? Or was it not the right time given what happened?! ;-)

On Tuesday, 16 April 2019 16:39:57 UTC+1, Jim GM4DHJ ... wrote:

horse it up as hard as you can ........no kidding

Really? I'm no strongman but that'd be a stripped thread no question at the very least. BTDTGTTS

Bill Wright wrote:
On 15/04/2019 21:29, Mathew Newton wrote:

If it makes any difference the pipe in question is 15mm Hep2O barrier
pipe and I am connecting to a TRV. Incidentally, I am aware of the importance
of using an insert.


The person who invented the name 'Hep2O' took the end of my finger off
in 1953.

I don't blame him.

--
Chris Green
·

Mathew Newton wrote:
On Tuesday, 16 April 2019 16:39:57 UTC+1, Jim GM4DHJ ... wrote:

horse it up as hard as you can ........no kidding

Really? I'm no strongman but that'd be a stripped thread no question at
the very least. BTDTGTTS


Dont do it. Its a stupid idea.

Tim

--
Please don't feed the trolls

"Tim+" wrote in message
...
Mathew Newton wrote:
On Tuesday, 16 April 2019 16:39:57 UTC+1, Jim GM4DHJ ... wrote:

horse it up as hard as you can ........no kidding

Really? I'm no strongman but that'd be a stripped thread no question at
the very least. BTDTGTTS


Don't do it. It's a stupid idea.

Tim

that is what plumbers do when they don't want to be called back to
leaks....use plenty of PTFE tape around the olive.....

On 17/04/2019 14:26, Jim GM4DHJ ... wrote:
"Tim+" wrote in message
...
Mathew Newton wrote:
On Tuesday, 16 April 2019 16:39:57 UTC+1, Jim GM4DHJ ... wrote:

horse it up as hard as you can ........no kidding

Really? I'm no strongman but that'd be a stripped thread no question at
the very least. BTDTGTTS


Don't do it. It's a stupid idea.

Tim

that is what plumbers do when they don't want to be called back to
leaks....use plenty of PTFE tape around the olive.....


never stripped a thread doing it yet....never had a leak
either.......done dozens...

idea.

Tim

that is what plumbers do when they don't want to be called back to
leaks....use plenty of PTFE tape around the olive.....



I disagree with PTFE on a compression fitting.

On 19/04/2019 13:15, DerbyBorn wrote:
idea.

Tim

that is what plumbers do when they don't want to be called back to
leaks....use plenty of PTFE tape around the olive.....



I disagree with PTFE on a compression fitting.


It should only be used on tapered thread fittings.

Its unreliable on anything else.

Gas fittings require a special thicker PTFE tape and only one turn.

?They leak if you use the thin stuff.

On 19/04/2019 13:15, DerbyBorn wrote:
idea.

Tim

that is what plumbers do when they don't want to be called back to
leaks....use plenty of PTFE tape around the olive.....

Only if they are bodgers making poor joints on inadequately cleaned
pipes, or over tightening the fittings.



I disagree with PTFE on a compression fitting.

Yup, I have never found a need for it as a general rule...

I have used it on the threads as a lubricant a few times where accesss
made getting adequate torque on the back nuts difficult, and possibly
once or twice over an olive where there was something preventing a
perfect seal, and there was no opportunity to change the fitting.

I find if the pipe and fittings are cleaned well, you should get a good
join pretty much every time.


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

In article ,
dennis@home wrote:
On 19/04/2019 13:15, DerbyBorn wrote:
idea.

Tim

that is what plumbers do when they don't want to be called back to
leaks....use plenty of PTFE tape around the olive.....



I disagree with PTFE on a compression fitting.


It should only be used on tapered thread fittings.

Its unreliable on anything else.

Gas fittings require a special thicker PTFE tape and only one turn.

?They leak if you use the thin stuff.

I'm sure that when I started DIY plumbing - late 1960s - there was only the
thicker PTFE tape.

--
from KT24 in Surrey, England
"I'd rather die of exhaustion than die of boredom" Thomas Carlyle

DerbyBorn wrote:
idea.

Tim

that is what plumbers do when they don't want to be called back to
leaks....use plenty of PTFE tape around the olive.....



I disagree with PTFE on a compression fitting.


Its Jim. Doubling up on spouting ********.

Tim

--
Please don't feed the trolls