Sidewalk Cleaning, Enviro Questions

The unloader is a possibility in this case I would venture to guess as well. Its too hard to tell as the entire assembly is toast, everything from the pressure switch, thermostat, wiring, burner, wiring box and switches, all the way down to the electrodes are a total loss. I will run it by a good welding shop tomorrow and let the take a look at it. I will have to have another end cap made to fit the coil as well but I may just call Moss Coil and have them ship me another one. The burner got extremely hot before and it was running 8gpm through it. I had a 2.25 nozzle in it running around 150psi on the fuel side. It was efficient in my book and in a compact size to boot. I will get it fixed then make a frame to hold a 5.5 machine under it to add to another trailer. WAIT I may get sued if something goes wrong. Sorry I had to say it
 
Chris Tharpe said:
The unloader is a possibility in this case I would venture to guess as well. Its too hard to tell as the entire assembly is toast, everything from the pressure switch, thermostat, wiring, burner, wiring box and switches, all the way down to the electrodes are a total loss. I will run it by a good welding shop tomorrow and let the take a look at it. I will have to have another end cap made to fit the coil as well but I may just call Moss Coil and have them ship me another one. The burner got extremely hot before and it was running 8gpm through it. I had a 2.25 nozzle in it running around 150psi on the fuel side. It was efficient in my book and in a compact size to boot. I will get it fixed then make a frame to hold a 5.5 machine under it to add to another trailer. WAIT I may get sued if something goes wrong. Sorry I had to say it
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what is the cost of a similar coil, never heard of Moss coil. The remainder or part of the coil may have been put past the steels elastic point, i would be wary of running that coil under usual concrete cleaning pressures again.
 
810f250 said:
I taught the mechanism in the thermostat switch worked regardless if water flow across it or not.

What if the system did not have a trapped pressure unloader, could the pressure build inside the coil due to the super heated steam go backward through a flow type unloader and alleviate the potential problem? I am not sure of the internals of a flow type unloader but when the trigger is released it unloads the pressure in the hose and coil under normal operation.


Sure right kaboom is a highly under stated description

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It does, at that point. Remember, that the hi temp switch is outside the coil, so in order for it to trigger, the heated water needs to be able to reach it at the high temperature. Think of it as your house water heater. Water comes out at 125 degrees, but cools as it goes. If you stop the flow of water to the faucet, the pipe immediately starts to cool.
 
Scott Stone said:
It does, at that point. Remember, that the hi temp switch is outside the coil, so in order for it to trigger, the heated water needs to be able to reach it at the high temperature. Think of it as your house water heater. Water comes out at 125 degrees, but cools as it goes. If you stop the flow of water to the faucet, the pipe immediately starts to cool.
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Ok, got it Scott, the water flow is no existent ( static) so the only way the thermostat or high limit safety temp switch may trigger, if it was going to, is by conduction through the non flowing water in the coil.

Did not understand if the flow unloader would diffuse the pressure build up in the coil after the burner did not shut off, does it?
 
I have had Flow unloaders that back flowed, so I guess they would though I think it would be an expensive pressure relief device.
 
I use trapped pressure and easy pull guns. They last longer and I hate down time.
 
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