W
Water Systems
That is a part of the unit. And one exploded lifting a roof in Newbury.
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That is a part of the unit. And one exploded lifting a roof in Newbury.
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S
Soggy_weetabix
Shall we disciss this in the combustion chamber, Big Burner? 
Your expertise and vast experience can be answered there.
The OP needs advice from RGI's and like you, well can dicuss all the pro's and cons and then give the OP the best way to proceed. Surely you are an RGI, because if your not, your comments are 'fragrant' at best.
I look forward to seeing you there.
Dave
Your expertise
and vast experience can be answered there.The OP needs advice from RGI's and like you, well can dicuss all the pro's and cons and then give the OP the best way to proceed. Surely you are an RGI, because if your not, your comments are 'fragrant' at best.
I look forward to seeing you there.
Dave
Just spotted the rust bubbles on the EV showing it had failed long before it split, its a wonder they hadn't spotted the rusty coloured hot water. lack of maintenance poor install same guy who left the filling loop attached? or is that because another fault is being cured with a regular fix.
Don't see many cylinder mounted EV's these days with good reason.
Don't see many cylinder mounted EV's these days with good reason.
Not to me
it looks to be the EV, thinned due to rust as is evident by the rust bubbles above the split.I cant see in mention of an unvented cylinder exploding in Tadley either, it does say electric hot water tank which you'd like us to read as "unvented".
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Shall we discuss this in the combustion chamber, Big Burner?
funny that it never pops it's ugly head in there isnt it
STILL Waiting for a Picture of AN UNVENTED UK FITTED CYLINDER BB, WS or any other alterego that you post your tripe under
Quite right AJS.
The circumferential stress in a thin cylinder is twice the longitudinal stress. See here for the maths;
http://www.tech.plym.ac.uk/sme/mech226/Thincylinders/thincyl.pdf
What that means in practical terms is that is a pipe/cylinder/expansion vessel fails due to over-pressurization, then it will split parallel with the axis. Frozen copper pipe always splits along the length, not around the perimeter.
It did not split along the length, so it is not a failure by over-pressurisation. So, what happened?
1) probably the diaphragm in the expansion vessel had failed, as they do. No worries there, the expansion relief valve should discharge the excess volume to waste. In foreign parts, unvented cylinders work like this, they don't have expansion vessels.
2) The expansion vessel is on top of the cylinder (should it be there?). The dissolved oxygen released from the water on heating collected in the expansion vessel. The expansion vessel would have continued to work as a bubble top calorifier, despite the loss of the diaphragm. However, the oxygen would cause corrosion of the steel vessel at the water line.
3) The expansion vessel eventually failed when its strength became unable to cope with the pressure maintained by the pressure relief valve.
It rusted and failed. No explosion. An explosion requires steam and steam requires simultaneous failure of the 3 safety devices. All down to neglect and possibly some idiot having messed about with it, probably, a lack of maintenance by the OP and now he's hoping to be able to hang the blame on the last sucker who touched it.
Happens every day, no explosion, no story.
Shall we discuss this in the combustion chamber, Big Burner?
What has this got to do with gas?
Which part of the Registered Gas Installer qualification deals with unvented water heaters? Or expansion? Or heating? Or domestic hot water supply? Or chemical water treatment?
Why does the OP need advice from an RGI?
Being an RGI does not make you an Engineer and does not qualify you to pontificate on anything but gas.
Has BB now turned to WS because i asked him a question about the "potential" dangers that may lie in thermal stores?! I'm very suprised that i have not even recieved a response.
Roughly how long does it take to google an answer?
Roughly how long does it take to google an answer?
W
Water Systems
I fully agree.
The WS/BB link he didn't post http://www.hantsfire.gov.uk/stories.htm?newsid=34917&stdate=
Anyone recognize the cylinder in the photo? and the boiler?.
![GALLERY]](http://[GALLERY=media, 9768][/GALLERY])
Anyone recognize the cylinder in the photo? and the boiler?.
To quote wilco47, He's the OP
Hi All,
Here are pictures of the airing cupboard after the expansion tank gave way:
The expansion vessel gave way, it did not explode.
How was the cylinder heated, and do you usually leave the hot water on when you go away for a few weeks.
Whats the betting the cylinder was stone cold.
Hi All,
Here are pictures of the airing cupboard after the expansion tank gave way:
The expansion vessel gave way, it did not explode.
How was the cylinder heated, and do you usually leave the hot water on when you go away for a few weeks.
Whats the betting the cylinder was stone cold.
There is clue in the photo http://tinyurl.com/cchhma
It is a solar cylinder made by http://www.hotwatercylinders.co.uk/ I have mentioned them before on here.
Nicely installed isn't it.
It is a solar cylinder made by http://www.hotwatercylinders.co.uk/ I have mentioned them before on here.
Nicely installed isn't it.
W
Water Systems
It should not explode at all. It did.
What job was this on AJS the split vessel one
The PRV is connected to the TPRV, there's no outlet.
W
Water Systems
You are saying it failed because of poor quality manufacturing. Then expect many sides of houses to come down in the future.
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