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Farm Building and Infrastructure
Renewable Energy
Whys my boiler temp got to 109 degrees?
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<blockquote data-quote="Fowler VF" data-source="post: 4150902" data-attributes="member: 57664"><p>Not a good place to be for all of the above answers. But then again, you asked the question should the pressure relief valve have blown before it got to this stage? Well at 109 degrees C the water isn't boiling if the pressure is above 1.38 bar. So if you have a 2 bar relief valve then it wont have blown off until the temperature gets up to nearer 120 degrees. This is definitely not a good place to be at all; if you had a pipe burst then dumping all that hot water onto the floor at 1 bar (atmospheric) pressure would mean that none of the water wanted to be water it will instantly turn to what it should be at that pressure and temperature, i.e. steam. Steam occupies an awful lot more space than water, so it has to rapidly expand its volume, so a wall of steam at 100 degrees plus blasts through the building trying to find its way out. I am describing a flash steam explosion!! Its why people get scalded when they undo a radiator cap on an engine; but the engine wasn't boiling they say, through the bandages!</p><p></p><p>Upshot of all this is you need to have some more safety measures in there. NEVER rely on just the pressure blow off, you need something that shuts down the production of heat on temperature, way before it starts to affect pressure. One of the big problems with a batch boiler system is how do you stop it completely when the system has reached temperature. The slightest bit of draft into the fire, or opening the door just makes it worse. Must have a heat dump, and preferably one that is gravity fed in case of power failure. Rising pressure also raises the boiling point and therefore hides the problem until she blows!</p></blockquote><p></p>
[QUOTE="Fowler VF, post: 4150902, member: 57664"] Not a good place to be for all of the above answers. But then again, you asked the question should the pressure relief valve have blown before it got to this stage? Well at 109 degrees C the water isn't boiling if the pressure is above 1.38 bar. So if you have a 2 bar relief valve then it wont have blown off until the temperature gets up to nearer 120 degrees. This is definitely not a good place to be at all; if you had a pipe burst then dumping all that hot water onto the floor at 1 bar (atmospheric) pressure would mean that none of the water wanted to be water it will instantly turn to what it should be at that pressure and temperature, i.e. steam. Steam occupies an awful lot more space than water, so it has to rapidly expand its volume, so a wall of steam at 100 degrees plus blasts through the building trying to find its way out. I am describing a flash steam explosion!! Its why people get scalded when they undo a radiator cap on an engine; but the engine wasn't boiling they say, through the bandages! Upshot of all this is you need to have some more safety measures in there. NEVER rely on just the pressure blow off, you need something that shuts down the production of heat on temperature, way before it starts to affect pressure. One of the big problems with a batch boiler system is how do you stop it completely when the system has reached temperature. The slightest bit of draft into the fire, or opening the door just makes it worse. Must have a heat dump, and preferably one that is gravity fed in case of power failure. Rising pressure also raises the boiling point and therefore hides the problem until she blows! [/QUOTE]
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Whys my boiler temp got to 109 degrees?
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