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Old 05-10-2015, 06:04 PM   #31
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Quote:
Originally Posted by Brian B-P


Maybe just that the heat energy required to melt ice is forty times greater than the heat energy of cooling the mass of water from boiling to freezing temperature, so a two litre (two quart) pot of boiling water will only melt 50 mL (a couple ounces) of ice... and that the hot water tend not to go where the ice is.
Very interesting statement Brian no wonder why winter last so long.
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Old 05-10-2015, 06:56 PM   #32
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I confess I never tried that. I am skeptible that hot water will migrate the 3' to the gate valve to thaw it. Nice alliteration btw. As I think on it, wouldn't work as you are pouring hot water into the tank where it will be diluted, not direclty into the frozen pipe.
You would have to then open the valve. Don't you think some of the hot water would get through the slush to dilute the slush? And take it all out with the water? I would think that the key is dumping immediately and putting enough hot water. That is what someone is doing and says it works.

I would not want another valve because, to me, that is two valves to freeze.
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Old 05-10-2015, 10:15 PM   #33
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It doesn't take much to raise the temperature of a slushy. Remember, you thaw a frozen turkey in cold water, not hot.
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Old 05-10-2015, 11:12 PM   #34
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It doesn't take much to raise the temperature of a slushy.
A good point is that a slushy is only partially ice - a substantial part is not frozen, and if that's true of your sewage then it isn't as bad to melt. On the other hand, slush flows, so it must be pretty frozen to not come out.

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Remember, you thaw a frozen turkey in cold water, not hot.
You thaw a turkey over a substantial period using water (cold enough to keep bacterial growth slow) as a heat transfer medium. The heat is coming from the room (if you don't use running water) or from a small increase in the temperature of a large volume of water (if you use running water). Also, a turkey is not just water - only a fraction of its mass is water to be thawed.

If you could take your frozen sewage plug out and put it in a sink of water so it was surrounded by moving water, it wouldn't be so bad. I don't think that's the typical frozen-discharge situation.

Lots of stuff gets frozen up here (the dog's water dish, etc). I have found that a pot of hot water doesn't melt much.
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Old 05-10-2015, 11:15 PM   #35
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... no wonder why winter last so long.
Yeah, it snowed a few centimetres (couple of inches) here on Wednesday, and it's been well above freezing since Thursday morning... and yet there are still patches of snow in shaded areas.
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Old 05-10-2015, 11:35 PM   #36
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Someone was referring to anti-freeze slush, not water.

Quote:
Originally Posted by Brian B-P View Post
A good point is that a slushy is only partially ice - a substantial part is not frozen, and if that's true of your sewage then it isn't as bad to melt. On the other hand, slush flows, so it must be pretty frozen to not come out.


You thaw a turkey over a substantial period using water (cold enough to keep bacterial growth slow) as a heat transfer medium. The heat is coming from the room (if you don't use running water) or from a small increase in the temperature of a large volume of water (if you use running water). Also, a turkey is not just water - only a fraction of its mass is water to be thawed.

If you could take your frozen sewage plug out and put it in a sink of water so it was surrounded by moving water, it wouldn't be so bad. I don't think that's the typical frozen-discharge situation.

Lots of stuff gets frozen up here (the dog's water dish, etc). I have found that a pot of hot water doesn't melt much.
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Old 05-11-2015, 12:19 AM   #37
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Someone was referring to anti-freeze slush, not water.
Good point - the frozen part will be the water component, and that's not all of it, just as any "slush" is a mix of ice and liquid.
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