On 28 Nov 2003 16:10:19 -0800, all email@example.com (mark al) wrote:
I have never used pushfit but would have some reservations about long-term
reliability - most
non-metals do deteriorate over time, especially when hot. I would also worry
about the effects of
repeated expand/contract cycles on CH pipes.
Soldered fittings are not all that difficult to do, and cheaper - I would go for
soldered for peace
of mind if installing in a house I intended to still be in after 10,20+ years'
----- Original Message -----
Sent: Saturday, November 29, 2003 12:10 AM
Subject: pushfit are they reliable?
I started doing my CH 'properly' using mix of soldered and compression.
After trying out a couple of speedfits recommended by the guy in the Plumb
Centre I did the rest using these.
It is just Sooooo much easier and quicker and you have a certain amount of
movement that you don't get with the solder of compression joints.
It works out more expensive but I think it's worth it. BTW, the only joints
I have ever had leak have been compression joints when not tightened
properly. My fault I know, but they seem to be the weak factor in any
plumbing work I do so I try to avoid them.
Yes. I've used them for years without any problems.
Avoid the real cheap ones and follow the instructions rigidly.
The seal largely comes from O rings and problems occur if these get damaged
because of rough pipe ends or whatever.
Yes Happy Christmas John, now what I meant was: which part of the
plastic system do you think will fail i.e. will the plastic itself go
brittle, will the O rings fail, will the grab ring fail, will it suffer
fatigue (like many metals do) what exactly do you think will fail?. Once
we've identified your concerns we can address them individually and
allay all your fears, I'm sure there were similar people like you about
when they started using that new fangled stuff called copper.
Good possibility, with all that constant expansion and contraction over the
years. And some of it does move a hell of a lot. Visually inches.
With constant rubbing through swivelling due to expansion, I would say yes.
Look at the O rings on swivel kitchen mixers. They don't last that long.
Speedfit are selling inserts with addition O rings, Osma Gold has a double
contact O ring. They are all attempting to improve the products because of
failures they have had. They are still evolving. Not there yet.
Probably O ring and then pipe.
No there was none. Over lead, there was no disadvantages of copper pipe and
it was immediately accepted. When compression joints came in the old school
scorned them. My mothers house was built in 1952 with compression joints,
gas and water, and not one failed.
Plastic is fine for cold water, it is when it is "hot", that problems arise.
If the variants of plastic used in plastic piping was so brilliant then ask
yourself this question. Why don't we see plastic hot water cylinders?
They could have ridges on the outside giving rigidity and cross members
inside the cylinder also giving strength too. The could double skin it.
I'm sure there is a myriad of ways of strengthening the thing. If what they
say about the piping is correct then this stuff is ideal for hot water
storage cylinders: prevents scale build up, less heat loss as copper is a
good conductor, longevity of 50 years etc.
We have had cold water storage in plastic tanks for over 40 years, yet no
plastic hot water cylinders. Has the penny dropped yet?
Ae you a plastic company troll?
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