On Tuesday, 6 October 2015 11:58:23 UTC+1, newshound wrote:
On 06/10/2015 11:04, Tim Watts wrote:
On 06/10/15 09:24, PeterC wrote:
On Tue, 06 Oct 2015 08:02:16 +0100, MM wrote:

I was contemplating what the results would be if one or both hoses
failed while I was away. They ~look~ okay, but I can only see a part
of them. The rest is behind the w/m.

MM

Some years ago I noticed that the pressure rating dropped rapidly with
temperature. Not a problem on indirect HW, but a combi feed would rise
close
to mains pressure when shut off, so if the hose is full of hot water...

About 15 years ago I installed a Miele - the hose was rated above any
mains
pressure at 90 deg. C.

Hoses are cheap, but I'm always wary of a new one being worse than the
original one. My last machine, an AEG, was OK for 13 years, so hoses were
good then.


I asked a plumber I know if he's seen any old appliance hoses look bad
(perished) after 10+ years. No was the answer.

I suspect these days, the hose will outlive the machine mechanics.

The main thing to check is if they've been damaged (kinked, cut etc).

Agreed.

These days they tend to have a PVC cladding, which eliminates Ozone and
UV attack on the rubber (not that they usually see much light). And of
course machines have been cold fill only for a long time now. I think
the only failure I have seen was at the cheap and nasty coupling, where
one of the "nuts" pinged out one thread a few weeks after (someone else)
fitted it.

The main failure point is the rubber washers.


NT