Hi.

I need to connect to some 15mm Hep2O (i.e. plastic) pipe in my central
heating, but the pipe has a long score mark where the joint will be; I'd
guess it could be up to 0.5mm deep. I'm worried the joint will weep. It
would be a bu**ger to replace the pipe back to where it is unscored.

The alternatives I can think of a

- use a pushfit fitting with silicone grease or a PTFE-based jointing
compound to fill the score mark;

- use a compression fitting 'clean', hoping the olive will compress into the
score and/or the plastic will deform to give a good seal;

- use a compression fitting with some jointing compound or PTFE tape around
the outside of the olive.

(It goes without saying that I'll need to use an insert, by the way!)

What are your view on the best approach?

Cheers

Steve

In article , Steve
writes
Hi.

I need to connect to some 15mm Hep2O (i.e. plastic) pipe in my central
heating, but the pipe has a long score mark where the joint will be; I'd
guess it could be up to 0.5mm deep. I'm worried the joint will weep. It
would be a bu**ger to replace the pipe back to where it is unscored.

The alternatives I can think of a

- use a pushfit fitting with silicone grease or a PTFE-based jointing
compound to fill the score mark;

- use a compression fitting 'clean', hoping the olive will compress into the
score and/or the plastic will deform to give a good seal;

- use a compression fitting with some jointing compound or PTFE tape around
the outside of the olive.

I think you are right that the original O-ring seal would be suspect.

Compression sounds the best and the 'liquid PTFE' suggestion sounds good
but it needs to be on the pipe and under the olive to help seal the
score. To get it there, smear some sealant on the pipe, push on the
olive, rotating as you go, push it past the jointing point, smear on a
tad more sealant on the pipe then pull the olive back. That should have
everything slipped up nicely so make the joint.
--
fred
BBC3, ITV2/3/4, channels going to the DOGs

In article ,
Steve wrote:
Hi.

I need to connect to some 15mm Hep2O (i.e. plastic) pipe in my central
heating, but the pipe has a long score mark where the joint will be; I'd
guess it could be up to 0.5mm deep. I'm worried the joint will weep. It
would be a bu**ger to replace the pipe back to where it is unscored.

The alternatives I can think of a

- use a pushfit fitting with silicone grease or a PTFE-based jointing
compound to fill the score mark;

- use a compression fitting 'clean', hoping the olive will compress into
the score and/or the plastic will deform to give a good seal;

- use a compression fitting with some jointing compound or PTFE tape
around the outside of the olive.

(It goes without saying that I'll need to use an insert, by the way!)

What are your view on the best approach?

Compression fitting and Fernox LS-X round the olive before tightening.

--
*There are 3 kinds of people: those who can count & those who can't.

Dave Plowman London SW
To e-mail, change noise into sound.

We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember "Steve"
saying something like:

I need to connect to some 15mm Hep2O (i.e. plastic) pipe in my central
heating, but the pipe has a long score mark where the joint will be;

Compression fitting with some joint gunge round the olive. Bob's yer Man
from Bonkle.

"Steve" wrote in message
news
Hi.

I need to connect to some 15mm Hep2O (i.e. plastic) pipe in my central
heating, but the pipe has a long score mark where the joint will be; I'd
....

Thanks all. Compression fitting + gunge it is.

Steve

"Grimly Curmudgeon" wrote in message
...
We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember "Steve"
saying something like:

I need to connect to some 15mm Hep2O (i.e. plastic) pipe in my central
heating, but the pipe has a long score mark where the joint will be;

Compression fitting with some joint gunge round the olive. Bob's yer Man
from Bonkle.

---under the olive surely.

We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember "John"
saying something like:

Compression fitting with some joint gunge round the olive. Bob's yer Man
from Bonkle.

---under the olive surely.

Doesn't matter, I've found. Sufficient gloop to do the job, but not too
much.