unvented cylinder.

[jl-heating]

i have just completed a unvented course to day,

apparently if a cylinder @ 100 degree c at a pressure of 10 bar fails on the safety measures hrough not been serviced.

the customer can expect it to blow up and launch from its position up through the roof,it will cause an explosion big enough to blow off the roof and blow down the walls like peeling a bannana and the water is over 300 degree c.

nohing in the vicinity will survive and if ur near it the steam will strip your whole body of its skin and take it to the bone in 1 sec flat.

gulp !!!!!!!

so if anyone wants 1 fitting i am ur man . lol..i think i will stick to the combi in the roof space.

 

[Andy™]

there was an ep on mythbusters where they 'removed' all safety devices. i blew like a bomb, launched up through the roof and hundreds of feet into the air

 

[Andy™]

YouTube - Water Heater Explosion Mythbusters

skip to 6.30 for the big explosion

 

[jl-heating]

now i like that ..lol..

 

[Apache]

I sleep at night happily with my unvented cylinder.

In the OP how did the water leap from 100

 

[NozSpark]

Loved the slowmo...

Looks like a sub launching a missile!!

 

[jl-heating]

I sleep at night happily with my unvented cylinder.In the OP how did the water leap from 100

 

[Apache]

its a pressure thing. 100 degrees at 10 bar = 330 degrees. gulp... remember its a regulation that an unvented cylinder is served on a yearly basis much like a gas boiler

NO

I agree that water boils at a higher temperature under pressure, so it's not at 100

 

[Andy™]

the temp will be the same pre and post explosion, but under pressure water boils at different temp, so in the youtube link, water is at well over 100 deg, but still liquid. once pressure is gone its instantly turns to gas

 

[Apache]

the temp will be the same pre and post explosion, but under pressure water boils at different temp, so in the youtube link, water is at well over 100 deg, but still liquid. once pressure is gone its instantly turns to gas

I know

Came up during my chemistry and physics A-levels..............

 

[Andy™]

I know

well isnt that just great - the vet knows more about water than the plumber!

 

[Apache]

Incidentally lower pressure up mount Everest means water would boil at a lower temperature so you can't make a decent cup of tea.

Thought you may all like to know that - when climbing Everest take a flask (or drink coffee)

 

[jl-heating]

NOI agree that water boils at a higher temperature under pressure, so it's not at 100

 

[Apache]

you tell me . i just know its hot.. also i did an unvented course this week and these are the figures i was quoted. :0

When you service an unvented cylinder what do you actually do?

 

[jl-heating]

did you not know anyc all sparkies know more than plumbers..

service :

check D1 and D2 pipes for blockages,

check anode if possible.

manually check operation of safety valves,

check and clean strainer,

check and clean filter,

if in a hard water area fit a de scaler.

check correct size of discharge pipe and safe termination.

check for leaks and signs of wear and tear,leakages.

expect