heater burst a pipe

Discussion in 'Motorhome Chat' started by mark49, Mar 17, 2019 at 12:34 PM.

  1. mark49

    mark49 Funster

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    Can anyone tell me what’s happened here. Could smell something and noticed water from under the bed area, heating was on but not high for maybe the last hour.
    Seems to have drained itself of water now.
    Thanks
     

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  2. pappajohn

    pappajohn Funster Life Member

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    Can't see a burst pipe but it looks like the pressure relief valve (the red thing) has opened and dumped water through the (clear) outlet pipe which the converters haven't bothered putting through the floor to the outside.
    Possibly the boiler thermostat has failed and its overheated

    No idea what that is at the top of the clear pipe, looks like some kind of sleeve over the pipe which has started to come apart. .
     
    Last edited: Mar 17, 2019 at 1:11 PM
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  3. mark49

    mark49 Funster

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    The clear pipe is the burst pipe were hot water was coming from.
    That clear pipe then goes to a hole in the floor next to the grated hole.
    What would cause the pressure if that is the case.
     
  4. Misterg

    Misterg Funster

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    Is the clear hose kinked or blocked anywhere? It should have an open end under the van.
     
  5. Scotch mist

    Scotch mist Funster

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    Not to sure what I’m seeing BUT I think papajohn is close , if the red thing is a prv ( pressure relief valve ) and the clear pipe is a discharge pipe, then I would say the prv has opened trying to discharge the water through the clear discharge pipe to the outside ( which should be open ended ) I think the clear pipe is likely to be blocked or blanked off , if the prv was passing , someone may have blanked it to stop the loss of fluid , the clear discharge pipe is not strong enough to hold the pressure so has burst

    Just an old heating engineer/ plumbers thoughts lol
     
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  6. pappajohn

    pappajohn Funster Life Member

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    OK, it isn't very clear in the photo as the edges don't look thick enough for the pipe and I can't see where it exits through the floor.
    The only thing that could cause that is the boiler safety valve opening which SHOULD dump water underneath but to burst the pipe it has to be blocked, probably underneath from general road crud.
    The safety valve will only open if the boiler overheats and the pressure exceeds the valves preset opening pressure.
    The boiler will only overheat if the internal stat has failed and can't shut the boiler off.
     
  7. mark49

    mark49 Funster

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    The pipe comes out the hole underneath then goes back into the flooring as if it’s a feed rather than an outlet. I’ll try attaching a new photo.
     

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  8. Scotch mist

    Scotch mist Funster

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    By chance Do you have a external shower ?
     
  9. mark49

    mark49 Funster

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    So is this a pressure relief valve?
     

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  10. mark49

    mark49 Funster

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    No external shower.
     
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  11. Scotch mist

    Scotch mist Funster

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    Don’t look like any prv I’m use to ( but still could be) it looks like a T ( branch) , where does the clear pipe go to when it goes back into the van
     
  12. mark49

    mark49 Funster

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    It looks like it comes into the underside of this valve, whatever that is. I assumed it was a drain point
     

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  13. Scotch mist

    Scotch mist Funster

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    Try putting a thin screwdriver through the top opening of the red tee
    To see if hits is any type of valve , if the screwdriver passes through the tee then it isn’t a prv but just a tee
     
  14. Scotch mist

    Scotch mist Funster

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    That could be a valve that opens when the temperature drops below (usually 3deg) to empty the heater and save it from frost damage
     
  15. mark49

    mark49 Funster

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    The screwdriver stops at the T joint.
     
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  16. tonyidle

    tonyidle Funster

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    Yes - the boiler is effectively a sealed vessel with the hot taps closed on the outlet and a non-return valve on the inlet. When the boiler heats up, the water inside expands. Most of the time the pipework is flexible enough to accommodate the expansion but ultimately the pressure relief valve releases a small amount of water. It should go via the clear pipe to the underside of the van. The clear pipe is what it appears to be - just a simple piece of pipe open at the end under the floor.

    Edit: Don't poke it with anything. It is not a T :).
     
  17. pappajohn

    pappajohn Funster Life Member

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    Whether it's a prv or not, that clear pipe is going nowhere.
    It's coming off the prv/elbow/tee, through the floor and back up to the dump valve which by default is closed so the clear pipe is blocked.

    How will the dump valve work? It can't empty the boiler as intended as the outlet goes back to the boiler.
    How do you drain down in winter?

    Whoever installed this wants their arse kicking until their nose bleeds.
     
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  18. Scotch mist

    Scotch mist Funster

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    @tonyidle

    The problem is the clear discharge pipe looks like it’s connected to a possible temperature relief valve
     
  19. pappajohn

    pappajohn Funster Life Member

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    Yep, a regular cold weather dump valve.... Which isn't going to work either.

    Never seen anything like this.
     
  20. mark49

    mark49 Funster

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    Should that clear pipe that comes out of the floor therefore have been cut on installation allowing one to empty and one to relieve any pressure.
    I’ve never emptied it before as it’s new to me.
     
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