Leaking joint between strap-on boss and soil pipe

[noth...@aolbin.com]

I've fitted several strap-on bosses without a problem, but the one I did
recently is leaking at the join between the boss and the pipe (and yes,
I did remember the solvent adhesive). The only thing that's different to
previous successes is that the soil pipe is the brown/orange type,
rather than grey, but I believe this should still be OK so I guess I
disturbed the joint before it had set. Bu&&er! I presume I have to cut
it off and use one of the Mcalpine mechanical bosses, unless someone
here has a better idea ... ?

[Steve Walker]

I have no idea if it would work, but how about mixing shavings of the
right plastic with the solvent and using it as a filler?

[Brian]

Are you sure both parts - the down pipe and the boss- are solvent weld
type?

Some pipe systems us plastic which doesn’t ‘melt’ when you apply the
solvent , both need to melt so you get a weld.

I’ve not encounter it with soil pipe but I’ve made the mistake with other
waste fittings !

If it hasn’t welded, that would be my guess.

How to fix it. Either get the right boss or try ensuring the waste goes
into the stack a gnats and try silicone but that isn’t something I would
rely on long term.

[Fredxx]

On 03/03/2022 14:19, Brian wrote:
> <noth...@aolbin.com> wrote:
>> I've fitted several strap-on bosses without a problem, but the one I did
>> recently is leaking at the join between the boss and the pipe (and yes,
>> I did remember the solvent adhesive). The only thing that's different to
>> previous successes is that the soil pipe is the brown/orange type,
>> rather than grey, but I believe this should still be OK so I guess I
>> disturbed the joint before it had set. Bu&&er! I presume I have to cut
>> it off and use one of the Mcalpine mechanical bosses, unless someone
>> here has a better idea ... ?
>>
>
> Are you sure both parts - the down pipe and the boss- are solvent weld
> type?
>
> Some pipe systems us plastic which doesn’t ‘melt’ when you apply the
> solvent , both need to melt so you get a weld.

I've come across polyethylene pan connectors that are pretty much
insoluble in every known solvent. PVC and ABS, if you use the right
solvent, are soluble and so weldable.

[noth...@aolbin.com]

On 03/03/2022 14:19, Brian wrote:

I believe the orange/brown underground soil pipe (I used it for the
stack pipe because I had it left over) should be solvent weld'able
(according to M'sieu Google). Although I was very tempted to squirt some
PU glue all around the fitting I decided to do the job properly and have
just cut-off the old boss (what did we do before multi-tools?) - parts
had welded but others hadn't. I'm now about to buy a mechanical boss but
have the problem of converting a 54mm hole in an awkward location into
an accurate'ish 57mm hole without being able to recreate a centre.

[Andy Burns]

Brian wrote:

> Are you sure both parts - the down pipe and the boss- are solvent weld
> type?

I thought the orange pipe was for underground, and always used push fit sockets?

[Fredxx]

If you're using a boss connector it doesn't have to be accurate. A
Dremel with a carbide bit will help speed things up.

[noth...@aolbin.com]

In fact it was fairly easy to enlarge with a sharp, rigid, knife and a
half-round rasp and file. The boss is now fitted and all is well with
the world, but it very nearly wasn't; the expanding bung requires the
fitting tool to be rotated *anticlockwise, initially I turned it the
"normal" way and the top-hat bush and rubber bung came close to falling
inside the pipe!

[newshound]

My understanding too (although I am fairly sure it won't be PE, and
therefore either ABS or PVC, and solvent weldable). The problem is that
it will not be fully UV resistant.

[noth...@aolbin.com]

On 03/03/2022 15:14, Andy Burns wrote:

It is made stronger for underground use but everything I have read
suggests it is OK with solvent adhesive. When I removed the failed joint
some of the solvent had "melted" the downpipe but there were gaps
elsewhere. I can only surmise that either the thing didn't seat properly
or I didn't leave it long enough.

[noth...@aolbin.com]

In my application it's internal and inside boxing.

[Andy Burns]

noth...@aolbin.com wrote:

> When I removed the failed joint some of the solvent
> had "melted" the downpipe but there were gaps elsewhere. I can only surmise that
> either the thing didn't seat properly or I didn't leave it long enough.

Maybe the non-stuck parts needed degreasing?