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Pressure testing for leaks in electric heater

Stephen Biddle
Hi All


I've got an industrial electric water heater in which I have just replaced the 66 elements and filled it up with water.  The heater manufacturer says I should pressure test it to 7.5 bar before commissioning, but the tank is vented to atmosphere.  So I can't do this.  The elements are sealed with compression fittings and olives set to manufacturer's torque spec of 140 NM.  it seems to me that if I don't do the pressure test there is a risk of a leak developing later, but I don't know what the probability is.


Any ideas?


Stephen
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    It sounds to me as if the heater manufacturer is expecting the heaters to be in a pressurised tank (perhaps 3 bar tank so pressure tested at 2 1/2 times working pressure?) but as it is in a vented tank the pressure test may not be applicable and a leak test sufficient. In addition to asking the manufacturer for the methodology, and possibly ahead of that question, I would suggest explaining the situation to the manufacturer and checking whether they still recommend a leak test.

    Alasdair
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  • 0
    It sounds to me as if the heater manufacturer is expecting the heaters to be in a pressurised tank (perhaps 3 bar tank so pressure tested at 2 1/2 times working pressure?) but as it is in a vented tank the pressure test may not be applicable and a leak test sufficient. In addition to asking the manufacturer for the methodology, and possibly ahead of that question, I would suggest explaining the situation to the manufacturer and checking whether they still recommend a leak test.

    Alasdair
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