a) At low temperatures, the water vapor condenses on the surface of the pipe and the moisture leads to corrosion. Pipe insulation avoids condensation at the surface.
b) Local -water supply pipes located in unheated areas, where the temperature dips below the freezing point face the problem of freezing of the standing water. As a result, the pipe expands causing a failure in the pipe system. Pipe insulation can increase the time required by the water to freeze, hence the risk of water freezing in the pipes is reduced.
c) The rate of heat transfer from a pipe is related to the difference between the pipe and the surrounding air temperature. Application of insulation in pipes will reduce the rate of heat transfer thereby causing less damage.
d) Extreme temperatures may result in physical accidents due to failure in the pipework system. Pipe insulation will facilitate in synchronizing the surface temperatures along with the air
e) Noise pollution also results in the failure of a pipework system. Proper insulation will prevent the transfer of noise and thus lessen the damage.
Materials used for pipe insulation:
1. Mineral wools: Rock wools and slag wools are inorganic strands of mineral fiber bound together by organic binders. These operate at high temperatures and are usually used for industrial pipework.
2. Glass wool is a good insulation material. This fibrous material is effective in high temperatures…
3. Rigid Foams: The commonly used method of pipe insulation is using rigid Phenolic foam. It possesses very low values of thermal conductivity.
4. Elastomeric foams: These are flexible in nature. They are mainly used for insulating pipework in refrigeration and air-conditioning systems. These foams are also applied on water-heating systems.
5. Polyethylene: A flexible type of plastic foam insulation is a popular method to avoid freezing of pipes meant for domestic water supply.
6. Silica Aerogel possesses low thermal conductivity; its usage is limited nowadays as Aerogel pipes are out of circulation.
The heat transferred through pipe insulation is calculated by the following formula:
R-value of each layer of pipe insulation must be calculated in order to find the amount of heat flow. The change in the R-value of pipe insulation is determined by three factors – thickness of the insulation material, thermal conductivity and average temperature of the material.
Spray foam insulation around pipes
Due to chilly winters, increase in heavy frosty weathers and higher costs incurred on home heating; insulation is considered a cost-effective method. Lack of insulation gives rise to mold, dust and pests. Effective insulation can help you cut down the costs incurred on energy consumption.
Spray foam pipe insulation is an expensive but reliable method. It should be installed by a certified professional only. It is used to insulate the spaces between a single pipe and the exterior wall.