Frozen pipe

Here are some preparation tips in advance of cold weather

Know what areas of your home, such as basements, crawl spaces, unheated rooms and outside walls, are most vulnerable to freezing.
Eliminate sources of cold air near water lines by repairing broken windows, insulating walls, closing off crawl spaces and eliminating drafts near doors.
Know the location of your main water shut-off valve. If a pipe freezes or bursts, shut the water off immediately.
Protect your pipes and water meter. Wrap exposed pipes with insulation or use electrical heat tracing wire; newspaper or fabric might also work. For outside meters, keep the lid to the meter pit closed tightly and let any snow that falls cover it. Snow acts as insulation, so don't disturb it.
When temperatures are consistently at or below freezing:

If you have pipes that are vulnerable to freezing, allow a small trickle of water to run overnight to keep pipes from freezing. The cost of the extra water is low compared to the cost to repair a broken pipe.
Open cabinet doors to expose pipes to warmer room temperatures to help keep them from freezing.
If your pipes freeze:

Shut off the water immediately. Don't attempt to thaw frozen pipes unless the water is shut off. Freezing can often cause unseen cracks in pipes or joints.
Apply heat to the frozen pipe by warming the air around it, or by applying heat directly to a pipe. You can use a hair dryer, space heater or hot water. Be sure not to leave space heaters unattended, and avoid the use of kerosene heaters or open flames.
Once the pipes have thawed, turn the water back on slowly and check for cracks and leaks.
Who to call for help:

If pipes inside the home are frozen, call a plumber, said Terry Maenza, spokesman for Pennsylvania American Water Company.

If there is no water or low pressure, and neighbors are experiencing the same situation, it could be a water main break, and customers should call the 24-hour customer service line at 1-800-565-7292.
When you are away:

Have a friend, relative or neighbor regularly check your property to ensure that the heat is working and the pipes have not frozen.
A freeze alarm can be purchased for less than $100 and will call a user-selected phone number if the inside temperature drops below 45 degrees.
Residents are also reminded to clear snow from hydrants. Substantial snow accumulations combined with the after-effects of plowing roads and parking lots can leave fire hydrants partially or completely buried in snow.

1. Insulate all water pipes from cold moving air and keep them dry. Locate the main water shut off in case you need it. Leaks often happen if the pipe is thawed out.

2. Use either heater tapes wrapped around the pipes or a heated reflector lamp in a dry enclosed space. On cold nights, check the light to see that it is working. The heater tapes work by a built-in thermostat. In order to work, the tape must be wrapped between the pipe and the insulation.

3. If electric power is unavailable or is lost, let the water run no faster than a slow constant drip; this is cheaper than repairing it. First start a slow drip on the hot side faucet, then a faster drip on the cold side faucet. There is no need to run a lot of water. Bathrooms can be cold, as long as they aren't freezing.

4. Remember to insulate and heat the drain lines in crawl spaces and cold basements. Again, a heat lamp focused on the drain p-trap will keep it from freezing if it is also protected from moving cold air with a boxed enclosure that you can build yourself.

5. To thaw a frozen pipe, first check the pipe in the area of the freeze. Some plastic or copper pipes will split and will flood the area when thawed. If the pipe looks busted or has a slit in it, call a plumber. If the pipe is all metal, it can be thawed by connecting a welder onto the pipe on each side of the frozen part. After a while it will be running again. This is just like connecting starter cables to the car battery, but with much longer cables.

6. It is far better to heat the area around the frozen part with an electric space heater, a hand-held hair dryer, or a heat lamp in a reflector to prevent a fire. If this is a problem, call the plumber. Some of them don't mind if you watch them as long as you are quiet and not in the way.

7. Always disconnect your water hose from your outdoor spigot in the winter, or before the temperature in your area drops below freezing. The water inside the hose can freeze, and the freezing continues back into the spigot until it reaches your pipes. If you have PVC plastic piping leading to this spigot, it will burst.

8. Use a temperature-controlled thermal convection powered hot water recirculation valve (which does not require electricity to operate) to continuously circulate warm water throughout your hot and cold waterlines anytime the temperature is below the user chosen set point 77F-140F. Unlike heat tape which only heats the pipes, this process circulates water non-stop to prevent crystallization and freezing no matter where the pipes are hidden. Note: This method requires that the valve be installed at a higher level (2nd - 3rd floor) than the water heater. Circulating water throughout your system non-stop will also increase your water heating bill.

9. Use a product called ICE LOC which prevents pipes from rupturing by taking up the expansion of the frozen water. It's an elastomer that fits inside pipes that are in trouble areas.

10. Use a RedyTemp, a device which utilizes an internal water contacting temperature probe to monitor the temperature of the water inside the pipes. Depending on the temperature set point you choose on the unit's temperature dial, it will circulate as needed to maintain the selected temperature. The RedyTemp optimizer installation is a DIY project and takes twenty minutes to install under a sink. Disconnect one end of the existing faucet supply lines and connect to the RedyTemp. Connect the two faucet supply lines which come with the RedyTemp. Plug the unit into a standard wall socket and set the desired temperature set point. Users can gauge the effectiveness of their chosen set point by opening a cold water faucet and feeling how cool/ambient/warm the water is it comes out of the tap, and adjust the set point until optimized.

Preventing Frozen Pipes

If Your Pipes Freeze/Break

Pipefreeze in Southern Climates

Winter Home Protection Tips

When water freezes, it expands. That's why a can of soda explodes if it's put into a freezer to chill quickly and forgotten. When water freezes in a pipe, it expands the same way. If it expands enough, the pipe bursts, water escapes and serious damage results.
Why Pipes Burst
Surprisingly, ice forming in a pipe does not typically cause a break where the ice blockage occurs. It's not the radial expansion of ice against the wall of the pipe that causes the break. Rather, following a complete ice blockage in a pipe, continued freezing and expansion inside the pipe causes water pressure to increase downstream -- between the ice blockage and a closed faucet at the end. It's this increase in water pressure that leads to pipe failure. Usually the pipe bursts where little or no ice has formed. Upstream from the ice blockage the water can always retreat back towards its source, so there is no pressure build-up to cause a break. Water has to freeze for ice blockages to occur. Pipes that are adequately protected along their entire length by placement within the building's insulation, insulation on the pipe itself, or heating, are safe.
Regional Differences
Generally, houses in northern climates are built with the water pipes located on the inside of the building insulation, which protects the pipes from subfreezing weather. However, extremely cold weather and holes in the building that allow a flow of cold air to come into contact with pipes can lead to freezing and bursting.
Water pipes in houses in southern climates often are more vulnerable to winter cold spells. The pipes are more likely to be located in unprotected areas outside of the building insulation, and homeowners tend to be less aware of freezing problems, which may occur only once or twice a season.
Pipes in attics, crawl spaces and outside walls are all vulnerable to freezing, especially if there are cracks or openings that allow cold, outside air to flow across the pipes. Research at the University of Illinois has shown that â€œwind chill,â€ the cooling effect of air and wind that causes the human body to lose heat, can play a major role in accelerating ice blockage, and thus bursting, in water pipes.
Holes in an outside wall where television, cable or telephone lines enter can provide access for cold air to reach pipes. The size of pipes and their composition (e.g., copper or PVC) have some bearing on how fast ice forms, but they are relatively minor factors in pipe bursting compared with the absence of heat, pipe insulation and exposure to a flow of subfreezing air.
When is it Cold Enough to Freeze?
When should homeowners be alert to the danger of freezing pipes? That depends, but in southern states and other areas where freezing weather is the exception rather than the rule (and where houses often do not provide adequate built-in protection), the â€œtemperature alert thresholdâ€ is 20°F.
This threshold is based upon research conducted by the Building Research Council at the University of Illinois. Field tests of residential water systems subjected to winter temperatures demonstrated that, for un-insulated pipes installed in an unconditioned attic, the onset of freezing occurred when the outside temperature fell to 20°F or below.

This finding was supported by a survey of 71 plumbers practicing in southern states, in which the consensus was that burst-pipe problems began to appear when temperatures fell into the teens. However, freezing incidents can occur when the temperature remains above 20° F. Pipes exposed to cold air (especially flowing air, as on a windy day) because of cracks in an outside wall or lack of insulation are vulnerable to freezing at temperatures above the threshold. However, the 20°F â€œtemperature alert thresholdâ€ should address the majority of potential burst-pipe incidents in southern states.
Mitigating the Problem
Water freezes when heat in the water is transferred to subfreezing air. The best way to keep water in pipes from freezing is to slow or stop this transfer of heat.
Ideally, it is best not to expose water pipes to subfreezing temperatures, by placing them only in heated spaces and keeping them out of attics, crawl spaces and vulnerable outside walls. In new construction, proper placement can be designed into the building.

In existing houses, a plumber may be able to re route at-risk pipes to protected areas, although this may not be a practical solution. If the latter is the case, vulnerable pipes that are accessible should be fitted with insulation sleeves or wrapping (which slows the heat transfer), the more insulation the better. It is important not to leave gaps that expose the pipe to cold air. Hardware stores and home centers carry the necessary materials, usually in foam rubber or fiberglass sleeves. Better yet, plumbing supply stores and insulation dealers carry pipe sleeves that feature extra-thick insulation, as much as 1â€ or 2â€ thick. The added protection is worth the extra cost.
Cracks and holes in outside walls and foundations near water pipes should be sealed with caulking to keep cold wind away from the pipes. Kitchen and bathroom cabinets can keep warm inside air from reaching pipes under sinks and in adjacent outside walls. It's a good idea to keep cabinet doors open during cold spells to let the warm air circulate around the pipes. Electric heating tapes and cables are available to run along pipes to keep the water from freezing. These must be used with extreme caution; follow the manufacturer's instructions carefully to avoid the risk of fire, and check to make sure the product conforms to UL 2049. Tapes and cables with a built-in thermostat will turn heat on when needed. Tapes without a thermostat have to be plugged in each time heat is needed, and may be forgotten.

Letting the Water Run
Letting a faucet drip during extreme cold weather can prevent a pipe from bursting. It's not that a small flow of water prevents freezing; this helps, but water can freeze even with a slow flow.
Rather, opening a faucet will provide relief from the excessive pressure that builds between the faucet and the ice blockage when freezing occurs. If there is no excessive water pressure, there is no burst pipe, even if the water inside the pipe freezes.
A dripping faucet wastes some water, so only pipes vulnerable to freezing (ones that run through an unheated or unprotected space) should be left with the water flowing. The drip can be very slight. Even the slowest drip at normal pressure will provide pressure relief when needed. Where both hot and cold lines serve a spigot, make sure each one contributes to the drip, since both are subjected to freezing. If the dripping stops, leave the faucet(s) open, since a pipe may have frozen and will still need pressure relief.
If You Suspect a Frozen Pipe
If you open a faucet and no water comes out, don't take any chances. Call a plumber. If a water pipe bursts, turn off the water at the main shut-off valve (usually at the water meter or where the main line enters the house); leave the faucet(s) open until repairs are completed. Don't try to thaw a frozen pipe with an open flame; as this will damage the pipe and may even start a building fire. You might be able to thaw a pipe with a hand-held hair dryer. Slowly apply heat, starting close to the faucet end of the pipe, with the faucet open. Work toward the coldest section. Don't use electrical appliances while standing in water; you could get electrocuted.
Going on a Trip
When away from the house for an extended period during the winter, be careful how much you lower the heat. A lower temperature may save on the heating bill, but there could be a disaster if a cold spell strikes and pipes that normally would be safe, freeze and burst.
A solution is to drain the water system. This is the best safeguard. With no water in the pipes, there is no freezing. This remedy should be considered even when the homeowner is not leaving but is concerned about a serious overnight freeze.
To drain the system, shut off the main valve and turn on every water fixture (both hot and cold lines) until water stops running. It's not necessary to leave the fixtures open, since the system is filled mostly with air at that point and not subject to freezing. When returning to the house, turn on the main valve and let each fixture run until the pipes are full again.
Source: Institute for Business and Home Safety. IBHS is a national nonprofit initiative of the insurance industry to reduce deaths, injuries, property damage, economic losses and human suffering caused by natural disasters.

How to Prevent and Deal With Frozen Pipes
A 1/8-inch crack in a pipe can leak up to 250 gallons of water a day, causing flooding, serious structural damage, and the immediate potential for mold.

Posted by Natalie Davis (Editor) , January 06, 2014 at 07:20 AM
Comment 8 Recommend
A few prevention-minded steps may help you avoid the aggravation and expense of frozen water pipes in your home.
A few prevention-minded steps may help you avoid the aggravation and expense of frozen water pipes in your home.
The first winter storm of 2014 continues to plague many in the area with bitterly cold temperatures. One big headache that can accompany the single-digit temperatures is frozen water pipes in unheated basements and crawl spaces of local homes.

Here is more information from the American Red Cross:

Why Frozen Pipes Are a Problem

Water expands as it freezes. This expansion puts extreme pressure on whatever is containing it, including metal or plastic pipes. Pipes that freeze most frequently are those that are exposed to severe cold, like outdoor water faucets, swimming pool supply lines, water sprinkler lines, and water supply pipes in unheated interior areas like basements and crawl spaces, attics, garages, or kitchen cabinets. Also, pipes that run against exterior walls that have little or no insulation are also subject to freezing.

A 1/8-inch crack in a pipe can leak up to 250 gallons of water a day, causing flooding, serious structural damage, and the immediate potential for mold.

In the US, frozen pipes cause significant damage every year, but they often can be prevented. Taking a few simple steps, even now, may save you the aggravation and expense.

Prevention

There are three common causes of frozen pipes:

1. Quick drops in temperature
2. Poor insulation, and
3. Thermostats set too low.

There are a number of preventative steps you can take to keep your pipes from freezing:

Check the insulation of pipes in your home's crawl spaces and attic. Exposed pipes are most susceptible to freezing.
Heat tape or thermostatically controlled heat cables can be used to wrap pipes. Be sure to use products approved by an independent testing organization, such as Underwriters Laboratories Inc., and only for the use intended (exterior or interior). Closely follow all manufacturers' installation and operation instructions.

Seal leaks that allow cold air inside near where pipes are located. Look for air leaks around electrical wiring, dryer vents, and pipes, and use caulk or insulation to keep the cold out. With severe cold, even a tiny opening can let in enough cold air to cause a pipe to freeze.

Use an indoor valve to shut off and drain water from pipes leading to outside faucets. This reduces the chance of freezing in the short span of pipe just inside the house.

A trickle of hot and cold water might be all it takes to keep your pipes from freezing. Let warm water drip overnight, preferably from a faucet on an outside wall.

Keep your thermostat set at the same temperature during both day and night. You might be in the habit of turning down the heat when you’re asleep, but further drops in the temperature – more common overnight – could catch you off guard and freeze your pipes.

Open cabinet doors to allow heat to get to un-insulated pipes under sinks and appliances near exterior walls.

If Your Pipes Do Freeze...

Don’t panic. Just because they’re frozen doesn’t mean they’ve already burst. Here’s what you can do:

• If you turn on your faucets and nothing comes out, leave the faucets turned on and call a plumber.
• If your house or basement is flooding, turn off the water valve and immediately call 911.
• Do not touch or use electrical appliances in areas of standing water due to electrocution concerns.
• Never try to thaw a pipe with a torch or other open flame because it could cause a fire hazard. Every year, many building fires are caused by people trying to thaw frozen pipes. All open flames in homes present a serious fire danger, as well as a severe risk of exposure to lethal carbon monoxide.
• You may be able to thaw a frozen pipe with the warm air from a hair dryer. Start by warming the pipe as close to the faucet as possible, working toward the coldest section of pipe.
• Again, if your water pipes have already burst, turn off the water at the main shutoff valve in the house; leave the water faucets turned on and call 911. Make sure everyone in your family knows where the water shutoff valve is and how to open and close it. Likely places for the water turn-off valve include internal pipes running against exterior walls or where water service enters a home through the foundation.
• If you will be going away during cold weather, leave the heat set to a temperature no lower than 55ºF.

Tuesday, January 7, 2014

How to unfreeze a frozen pipe in my kitchen

Preparation tips in advance of cold weather

How to unfreeze a frozen pipe in my kitchen