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#1
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How long does it take to thaw out an underground pipe?
My previous thread about my frozen supply pipe elicited no helpful
suggestions, frankly just as I expected. There just isn't any way to thaw out a pipe in the ground. So now it's 4 days later, and the air temperature here has been above 4 for all that time, even at night, and most days above 6. Pits dug around the garden in the likely places have not found the pipe yet, but do confirm that the ground is NOT frozen now - at any depth. I've checked that the stopcock in the road is OK, and that there is nothing impeding flow at the house. The pit was full of ice on Monday, but has been clear since I cooked that out with boiling water. Does anyone know how long it will take to thaw a pipe, or does this sound like a 'hire a digger' job? Much appreciate some help on this, as watching SWMBO with the bucket of her head going to the village pump is getting boring. R. |
#2
Posted to uk.d-i-y
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How long does it take to thaw out an underground pipe?
TheOldFellow wrote:
My previous thread about my frozen supply pipe elicited no helpful suggestions, frankly just as I expected. There just isn't any way to thaw out a pipe in the ground. So now it's 4 days later, and the air temperature here has been above 4 for all that time, even at night, and most days above 6. Pits dug around the garden in the likely places have not found the pipe yet, but do confirm that the ground is NOT frozen now - at any depth. I've checked that the stopcock in the road is OK, and that there is nothing impeding flow at the house. The pit was full of ice on Monday, but has been clear since I cooked that out with boiling water. Does anyone know how long it will take to thaw a pipe, or does this sound like a 'hire a digger' job? Much appreciate some help on this, as watching SWMBO with the bucket of her head going to the village pump is getting boring. R. How cold did it get in the air and roughly how long? My supply is 2' down and have never frozen though the top layer of the ground does freeze for some random depth - probably a few inches. I suspect as you found ice in the stopcock pit that that is where the freezing took place. Can you pour some more boiling water down there? If the ground is now unfrozen at any depth, the pipe should follow suit - the difference being the ground is not solid water/ice so has a lower amount of heat per cubed required to thaw it. The pipe if frozen of course may take longer but it is only a small diameter. Cheers, Tim -- Tim Watts |
#3
Posted to uk.d-i-y
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How long does it take to thaw out an underground pipe?
"Tim Watts" wrote in message ... TheOldFellow wrote: My previous thread about my frozen supply pipe elicited no helpful suggestions, frankly just as I expected. There just isn't any way to thaw out a pipe in the ground. So now it's 4 days later, and the air temperature here has been above 4 for all that time, even at night, and most days above 6. Pits dug around the garden in the likely places have not found the pipe yet, but do confirm that the ground is NOT frozen now - at any depth. I've checked that the stopcock in the road is OK, and that there is nothing impeding flow at the house. The pit was full of ice on Monday, but has been clear since I cooked that out with boiling water. Does anyone know how long it will take to thaw a pipe, or does this sound like a 'hire a digger' job? Much appreciate some help on this, as watching SWMBO with the bucket of her head going to the village pump is getting boring. R. How cold did it get in the air and roughly how long? My supply is 2' down and have never frozen though the top layer of the ground does freeze for some random depth - probably a few inches. I suspect as you found ice in the stopcock pit that that is where the freezing took place. Can you pour some more boiling water down there? If the ground is now unfrozen at any depth, the pipe should follow suit - the difference being the ground is not solid water/ice so has a lower amount of heat per cubed required to thaw it. The pipe if frozen of course may take longer but it is only a small diameter. Cheers, Tim -- Tim Watts Your supply pipe should be at a "mimimum" depth of 30" to prevent freezing. the pipe normally goes straight to the house from the stop cock, you shouldn't have to dig all over the garden to find it. good luck in your search |
#4
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How long does it take to thaw out an underground pipe?
On Thu, 30 Dec 2010 14:20:26 -0000
"A Plumber" wrote: "Tim Watts" wrote in message ... TheOldFellow wrote: My previous thread about my frozen supply pipe elicited no helpful suggestions, frankly just as I expected. There just isn't any way to thaw out a pipe in the ground. So now it's 4 days later, and the air temperature here has been above 4 for all that time, even at night, and most days above 6. Pits dug around the garden in the likely places have not found the pipe yet, but do confirm that the ground is NOT frozen now - at any depth. I've checked that the stopcock in the road is OK, and that there is nothing impeding flow at the house. The pit was full of ice on Monday, but has been clear since I cooked that out with boiling water. Does anyone know how long it will take to thaw a pipe, or does this sound like a 'hire a digger' job? Much appreciate some help on this, as watching SWMBO with the bucket of her head going to the village pump is getting boring. R. How cold did it get in the air and roughly how long? My supply is 2' down and have never frozen though the top layer of the ground does freeze for some random depth - probably a few inches. I suspect as you found ice in the stopcock pit that that is where the freezing took place. Can you pour some more boiling water down there? If the ground is now unfrozen at any depth, the pipe should follow suit - the difference being the ground is not solid water/ice so has a lower amount of heat per cubed required to thaw it. The pipe if frozen of course may take longer but it is only a small diameter. Cheers, Tim -- Tim Watts Your supply pipe should be at a "mimimum" depth of 30" to prevent freezing. the pipe normally goes straight to the house from the stop cock, you shouldn't have to dig all over the garden to find it. good luck in your search Mmm. Thanks for the information. Nice in theory. My house is an L-shaped bungalow, the long side points to the road (country lane), the rising main comes up at the other end of the short side of the L. About 35 metres from the supplier's stopcock, diagonally across the plot. So unless the dorks that built it in 1970 ran the pipe under the slab, through 90 and through the rest of the slab, it runs right under the lawn. Strangely the stopcock appears to be running parallel with the road, and not pointing towards the house at all. It's also at least 10 metres from the edge of the tarmacked drive in all directions So I can't dig round it to find a direction. Thanks for the good wishes. I rather suspect that hiring a minidigger is going to be nightmare here for the next six months... Still I do own a pick. Incidentally, do I have a complaint against United Utilities as my stopcock is only 15" below the road? I realise that the pipe from there to my stopcock is my responsibility. Let's say that I do have to replace the pipe. Can I bring it into the house at the end futhers from the kitchen sink, and take it (lagged with the right stuff) through the roof to the serve the various taps and the HW tank? Or does it have to come up under the sink? If I can do that, I still have to cut through the tarmac, but it's the shortest route to the inside. The stopcock would be in the attached garage though. R. |
#5
Posted to uk.d-i-y
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How long does it take to thaw out an underground pipe?
On Thu, 30 Dec 2010 14:08:32 +0000
Tim Watts wrote: TheOldFellow wrote: My previous thread about my frozen supply pipe elicited no helpful suggestions, frankly just as I expected. There just isn't any way to thaw out a pipe in the ground. So now it's 4 days later, and the air temperature here has been above 4 for all that time, even at night, and most days above 6. Pits dug around the garden in the likely places have not found the pipe yet, but do confirm that the ground is NOT frozen now - at any depth. I've checked that the stopcock in the road is OK, and that there is nothing impeding flow at the house. The pit was full of ice on Monday, but has been clear since I cooked that out with boiling water. Does anyone know how long it will take to thaw a pipe, or does this sound like a 'hire a digger' job? Much appreciate some help on this, as watching SWMBO with the bucket of her head going to the village pump is getting boring. R. How cold did it get in the air and roughly how long? Not sure as I was away from Thursday to Monday. Last week was very cold, -13.5 on Monday night, and people say that it was -11 on Christmas Eve (Friday). I don't think it got above freezing in the air from Monday to Sunday (Boxing Day) My supply is 2' down and have never frozen though the top layer of the ground does freeze for some random depth - probably a few inches. I suspect as you found ice in the stopcock pit that that is where the freezing took place. Can you pour some more boiling water down there? It has water welling up through the gravel at the bottom of the pit, so the hot water cools almost instantly. The pit is only 15 inches below road level. It's a rural lane. We're in North Cumbria here. If the ground is now unfrozen at any depth, the pipe should follow suit - the difference being the ground is not solid water/ice so has a lower amount of heat per cubed required to thaw it. The pipe if frozen of course may take longer but it is only a small diameter. There is quite of lot of ice and snow on the roads round here still, especially where the sun never reaches. My garden is shaded just where the pipe would run (I think). I can't check below the paths, which is where the pipe might run, and they are in the deepest shade. I'm definitely thinking replacement with a trace heater for next year. Even though it does mean trenching through the tarmac drive. Good excuse to buy a big angle grinder R. |
#6
Posted to uk.d-i-y
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How long does it take to thaw out an underground pipe?
TheOldFellow wrote:
My previous thread about my frozen supply pipe elicited no helpful suggestions, frankly just as I expected. There just isn't any way to thaw out a pipe in the ground. So now it's 4 days later, and the air temperature here has been above 4 for all that time, even at night, and most days above 6. Pits dug around the garden in the likely places have not found the pipe yet, but do confirm that the ground is NOT frozen now - at any depth. I've checked that the stopcock in the road is OK, and that there is nothing impeding flow at the house. The pit was full of ice on Monday, but has been clear since I cooked that out with boiling water. Does anyone know how long it will take to thaw a pipe, or does this sound like a 'hire a digger' job? Much appreciate some help on this, as watching SWMBO with the bucket of her head going to the village pump is getting boring. R. Firstly, if the house was built in the 70's, it's highly likely that the main is less than the required 30 inch minimum depth, a lot less - it's possible it's only a foot down, given the laxidasical way building was carried out in this country during the 70's. I'm assuming it's in black plastic? There's a cold spot where the main enters the building - if you can find where the main enters either the concrete footings or the brickwork (below ground) this is the most likely place for a freeze, and it's why 150mm lagging is used at this point during new mains installations, regardless of depth -- Phil L RSRL Tipster Of The Year 2008 |
#7
Posted to uk.d-i-y
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How long does it take to thaw out an underground pipe?
On 2010-12-30 13:56:03 +0000, TheOldFellow said:
My previous thread about my frozen supply pipe elicited no helpful suggestions, frankly just as I expected. There just isn't any way to thaw out a pipe in the ground. So now it's 4 days later, and the air temperature here has been above 4 for all that time, even at night, and most days above 6. Pits dug around the garden in the likely places have not found the pipe yet, but do confirm that the ground is NOT frozen now - at any depth. I've checked that the stopcock in the road is OK, and that there is nothing impeding flow at the house. The pit was full of ice on Monday, but has been clear since I cooked that out with boiling water. Does anyone know how long it will take to thaw a pipe, or does this sound like a 'hire a digger' job? Much appreciate some help on this, as watching SWMBO with the bucket of her head going to the village pump is getting boring. R. Can't remember if I replied to your previous thread. I've had a rising main, in an outbuilding, freeze this year. At first I thought it froze in an inspection pit (before the rising main in the outbuilding), so left an oil filled radiator in sad pit on for 24 hours. Didn't solve the problem (presumably because it wasn't frozen there). I moved on to the outbuilding. This rising main basically comes out of concrete in plastic then a stopcock, with 22mm copper pipe up into a more insulated/very slightly heated room above. Half-way up is a tap. Turning the tap on yielded no water. So I brought the above radiator and sat it next to where the rising main comes out of the ground, surround it will polystyrene (could have used some kingspan off cuts) and left it. About 2 hours later I got a small amount of water out of the tap - as presumably the water above ground had thawed and was coming back down the pipe. About an hour after than the whole thing had flawed. So, can you try long concentrated heat where the pipe comes out of the ground? |
#8
Posted to uk.d-i-y
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How long does it take to thaw out an underground pipe?
On Dec 30, 2:53*pm, TheOldFellow wrote:
On Thu, 30 Dec 2010 14:08:32 +0000 Tim Watts wrote: TheOldFellow wrote: My previous thread about my frozen supply pipe elicited no helpful suggestions, frankly just as I expected. *There just isn't any way to thaw out a pipe in the ground. So now it's 4 days later, and the air temperature here has been above 4 for all that time, even at night, and most days above 6. Pits dug around the garden in the likely places have not found the pipe yet, but do confirm that the ground is NOT frozen now - at any depth. I've checked that the stopcock in the road is OK, and that there is nothing impeding flow at the house. *The pit was full of ice on Monday, but has been clear since I cooked that out with boiling water. Does anyone know how long it will take to thaw a pipe, or does this sound like a 'hire a digger' job? Much appreciate some help on this, as watching SWMBO with the bucket of her head going to the village pump is getting boring. R. How cold did it get in the air and roughly how long? Not sure as I was away from Thursday to Monday. *Last week was very cold, -13.5 on Monday night, and people say that it was -11 on Christmas Eve (Friday). *I don't think it got above freezing in the air from Monday to Sunday (Boxing Day) My supply is 2' down and have never frozen though the top layer of the ground does freeze for some random depth - probably a few inches. I suspect as you found ice in the stopcock pit that that is where the freezing took place. Can you pour some more boiling water down there? It has water welling up through the gravel at the bottom of the pit, so the hot water cools almost instantly. *The pit is only 15 inches below road level. *It's a rural lane. *We're in North Cumbria here. If the ground is now unfrozen at any depth, the pipe should follow suit - the difference being the ground is not solid water/ice so has a lower amount of heat per cubed required to thaw it. The pipe if frozen of course may take longer but it is only a small diameter. There is quite of lot of ice and snow on the roads round here still, especially where the sun never reaches. *My garden is shaded just where the pipe would run (I think). *I can't check below the paths, which is where the pipe might run, and they are in the deepest shade. I'm definitely thinking replacement with a trace heater for next year. Even though it does mean trenching through the tarmac drive. *Good excuse to buy a big angle grinder R.- Hide quoted text - - Show quoted text - The biggest problem with underground pipes is not freezing but ground heave due to frost. A joint may have broken. The water you mention in your stoptap pit may point to the problem. If there is unfrozen groundwater it doesn't sound like your pipe has frozen, more like broken. What you need is a listening stick and starting from the stop tap listen for the leak. Works well on the pipe and hard surfaces thought some experience helps. A big screwdriver can be used but not as good. Press blade onto stoptap and ear against end of handle and listed for hissing noises. Press hard. |
#9
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How long does it take to thaw out an underground pipe?
On Dec 30, 3:28*pm, harry wrote:
On Dec 30, 2:53*pm, TheOldFellow wrote: On Thu, 30 Dec 2010 14:08:32 +0000 Tim Watts wrote: TheOldFellow wrote: My previous thread about my frozen supply pipe elicited no helpful suggestions, frankly just as I expected. *There just isn't any way to thaw out a pipe in the ground. So now it's 4 days later, and the air temperature here has been above 4 for all that time, even at night, and most days above 6. Pits dug around the garden in the likely places have not found the pipe yet, but do confirm that the ground is NOT frozen now - at any depth. I've checked that the stopcock in the road is OK, and that there is nothing impeding flow at the house. *The pit was full of ice on Monday, but has been clear since I cooked that out with boiling water. Does anyone know how long it will take to thaw a pipe, or does this sound like a 'hire a digger' job? Much appreciate some help on this, as watching SWMBO with the bucket of her head going to the village pump is getting boring. R. How cold did it get in the air and roughly how long? Not sure as I was away from Thursday to Monday. *Last week was very cold, -13.5 on Monday night, and people say that it was -11 on Christmas Eve (Friday). *I don't think it got above freezing in the air from Monday to Sunday (Boxing Day) My supply is 2' down and have never frozen though the top layer of the ground does freeze for some random depth - probably a few inches. I suspect as you found ice in the stopcock pit that that is where the freezing took place. Can you pour some more boiling water down there? It has water welling up through the gravel at the bottom of the pit, so the hot water cools almost instantly. *The pit is only 15 inches below road level. *It's a rural lane. *We're in North Cumbria here. If the ground is now unfrozen at any depth, the pipe should follow suit - the difference being the ground is not solid water/ice so has a lower amount of heat per cubed required to thaw it. The pipe if frozen of course may take longer but it is only a small diameter. There is quite of lot of ice and snow on the roads round here still, especially where the sun never reaches. *My garden is shaded just where the pipe would run (I think). *I can't check below the paths, which is where the pipe might run, and they are in the deepest shade. I'm definitely thinking replacement with a trace heater for next year. Even though it does mean trenching through the tarmac drive. *Good excuse to buy a big angle grinder R.- Hide quoted text - - Show quoted text - The biggest problem with underground pipes is not freezing but ground heave due to frost. A joint may have broken. The water you mention in your stoptap pit may point to the problem. If there is unfrozen groundwater it doesn't sound like your pipe has frozen, more like broken. What you need is a listening stick and starting from the stop tap listen for the leak. *Works well on the pipe and hard surfaces thought some experience helps. A big screwdriver can be used but not as good. *Press blade onto stoptap and ear against end of handle and listed for hissing noises. Press hard.- Hide quoted text - - Show quoted text - BTW if it is a leak don't let any bugger go digging up yards of pipe until the leak has been located. Biggest con/ripoff in the book tp get money off of you . Leaks can be pinpointed these days, you need the right people who will have sophisticated electronic devices. Leaks sometimes appear hundreds of yards from their source, they follow the trench & then pop up.. |
#10
Posted to uk.d-i-y
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How long does it take to thaw out an underground pipe?
On Dec 30, 3:32*pm, harry wrote:
On Dec 30, 3:28*pm, harry wrote: On Dec 30, 2:53*pm, TheOldFellow wrote: On Thu, 30 Dec 2010 14:08:32 +0000 Tim Watts wrote: TheOldFellow wrote: My previous thread about my frozen supply pipe elicited no helpful suggestions, frankly just as I expected. *There just isn't any way to thaw out a pipe in the ground. So now it's 4 days later, and the air temperature here has been above 4 for all that time, even at night, and most days above 6. Pits dug around the garden in the likely places have not found the pipe yet, but do confirm that the ground is NOT frozen now - at any depth. I've checked that the stopcock in the road is OK, and that there is nothing impeding flow at the house. *The pit was full of ice on Monday, but has been clear since I cooked that out with boiling water. Does anyone know how long it will take to thaw a pipe, or does this sound like a 'hire a digger' job? Much appreciate some help on this, as watching SWMBO with the bucket of her head going to the village pump is getting boring. R. How cold did it get in the air and roughly how long? Not sure as I was away from Thursday to Monday. *Last week was very cold, -13.5 on Monday night, and people say that it was -11 on Christmas Eve (Friday). *I don't think it got above freezing in the air from Monday to Sunday (Boxing Day) My supply is 2' down and have never frozen though the top layer of the ground does freeze for some random depth - probably a few inches. I suspect as you found ice in the stopcock pit that that is where the freezing took place. Can you pour some more boiling water down there? It has water welling up through the gravel at the bottom of the pit, so the hot water cools almost instantly. *The pit is only 15 inches below road level. *It's a rural lane. *We're in North Cumbria here. If the ground is now unfrozen at any depth, the pipe should follow suit - the difference being the ground is not solid water/ice so has a lower amount of heat per cubed required to thaw it. The pipe if frozen of course may take longer but it is only a small diameter. There is quite of lot of ice and snow on the roads round here still, especially where the sun never reaches. *My garden is shaded just where the pipe would run (I think). *I can't check below the paths, which is where the pipe might run, and they are in the deepest shade. I'm definitely thinking replacement with a trace heater for next year.. Even though it does mean trenching through the tarmac drive. *Good excuse to buy a big angle grinder R.- Hide quoted text - - Show quoted text - The biggest problem with underground pipes is not freezing but ground heave due to frost. A joint may have broken. The water you mention in your stoptap pit may point to the problem. If there is unfrozen groundwater it doesn't sound like your pipe has frozen, more like broken. What you need is a listening stick and starting from the stop tap listen for the leak. *Works well on the pipe and hard surfaces thought some experience helps. A big screwdriver can be used but not as good. *Press blade onto stoptap and ear against end of handle and listed for hissing noises. Press hard.- Hide quoted text - - Show quoted text - BTW if it is a leak don't let any bugger go digging up yards of pipe until the leak has been located. Biggest con/ripoff in the book tp get money off of you . *Leaks can be pinpointed these days, you need the right people who will have sophisticated electronic devices. *Leaks sometimes appear hundreds of yards from their source, they follow the trench & then pop up..- Hide quoted text - - Show quoted text - Listening sticks, halfway down page. http://www.msfengineering.co.uk/products.asp?id=1 |
#11
Posted to uk.d-i-y
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How long does it take to thaw out an underground pipe?
TheOldFellow wrote:
Incidentally, do I have a complaint against United Utilities as my stopcock is only 15" below the road? I realise that the pipe from there to my stopcock is my responsibility. That's bad - a depth where it could easily freeze. Let's say that I do have to replace the pipe. Can I bring it into the house at the end futhers from the kitchen sink, and take it (lagged with the right stuff) through the roof to the serve the various taps and the HW tank? Or does it have to come up under the sink? You can take it in where you like. The sink is only traditional as that is the first device served before it heads upstairs in many, especially older, houses. I would advice to stick a 1/4 turn lever valve (full bore 15mm or 22mm) on on the first foot or so out of the floor inside so you can isolate as much pipe as possible from a convenient position. If you did run a new pipe, I personally would run a larger size (equivalent to 22mm copper in bore - 28mm MDPE I think(?) to allow for a better flow - you never know in the future if that would be helful and the material cost difference is small. If I can do that, I still have to cut through the tarmac, but it's the shortest route to the inside. The stopcock would be in the attached garage though. R. Cheers, Tim -- Tim Watts |
#12
Posted to uk.d-i-y
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How long does it take to thaw out an underground pipe?
"TheOldFellow" wrote in message ... My previous thread about my frozen supply pipe elicited no helpful suggestions, frankly just as I expected. There just isn't any way to thaw out a pipe in the ground. So now it's 4 days later, and the air temperature here has been above 4 for all that time, even at night, and most days above 6. Pits dug around the garden in the likely places have not found the pipe yet, but do confirm that the ground is NOT frozen now - at any depth. I've checked that the stopcock in the road is OK, and that there is nothing impeding flow at the house. The pit was full of ice on Monday, but has been clear since I cooked that out with boiling water. Does anyone know how long it will take to thaw a pipe, or does this sound like a 'hire a digger' job? Much appreciate some help on this, as watching SWMBO with the bucket of her head going to the village pump is getting boring. R. Possible solution if we're talking about metal pipes. During the cold winter of 1963 I was living in digs and either the supply pipe to the house or the main under the pavement froze. The Electricity Board (as it then was) turned up with a welding generator, connected it between the stop tap in one house and the stop tap next door and put enough current through the pipes to unfreeze them in quick time. But no good, I'm afraid, if you're on plastic. Stephen |
#13
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How long does it take to thaw out an underground pipe?
We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember harry saying something like: Listening sticks, halfway down page. http://www.msfengineering.co.uk/products.asp?id=1 Ffs, will you snip? |
#14
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How long does it take to thaw out an underground pipe?
We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember TheOldFellow saying something like: My previous thread about my frozen supply pipe elicited no helpful suggestions, frankly just as I expected. There just isn't any way to thaw out a pipe in the ground. So now it's 4 days later, My neighbour's supply pipe has only just thawed out, some five days after a -17C night. I don't know what depth it was buried at, but I suspect it was only a foot or so and it had been concreted over (a farmyard). |
#15
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How long does it take to thaw out an underground pipe?
harry wrote:
The biggest problem with underground pipes is not freezing but ground heave due to frost. No, it is not. |
#16
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How long does it take to thaw out an underground pipe?
On Thu, 30 Dec 2010 16:11:15 +0000
Tim Watts wrote: TheOldFellow wrote: Incidentally, do I have a complaint against United Utilities as my stopcock is only 15" below the road? I realise that the pipe from there to my stopcock is my responsibility. That's bad - a depth where it could easily freeze. And indeed that is where it had frozen. Five kettles of boiling beck water, sucked out with a wet'n'dry vac when it got cold. Sounds of rushing water! Said 15" pit is now filled with (removable) insulation. New job on list: fit new deep large bore mains water feed. Whoopeee Bath Morning!!! Thanks everyone for the encouragement. R. |
#17
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How long does it take to thaw out an underground pipe?
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#18
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How long does it take to thaw out an underground pipe?
On Fri, 31 Dec 2010 13:25:02 -0000
Skipweasel wrote: In article , lid says... Said 15" pit is now filled with (removable) insulation. New job on list: fit new deep large bore mains water feed. Large bore would flow more slowly, making it more likely to freeze, I'd have thought. Provided the bore is sufficient not to restrict flow below a useful level, I'd leave it narrow. That's where the 'deep' comes in. Say 1 metre, water regs is 750mm for new. Present pipe is only 350mm - hence the problem. And I'm going to put a heater wire alongside it. R. |
#19
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How long does it take to thaw out an underground pipe?
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