Wool-Felt Insulation
Wool, felt relatively inexpensive type of insulation of pipelines and consists of successive layers of waterproof wool felt, which are located in the production process of the formation of the airspace. The inner layer is waterproof asphalt-roofing, while the outer layer is an integral waterproof jacket. This insulating material is satisfactory when it can be in the air - and moisture resistance. If the air is allowed to penetrate, condensation will occur in the wool, felt, and he will quickly deteriorate. Thus, it is advisable to use only where the temperature is above 40 degrees F meet and when it's sealed. Under all circumstances, he shall bear the manufacturer's warranty obligations, it performs.
After all pipelines thoroughly wash and dry, sectional coating is typically applied directly to the pipe with the outer layer, slipped and happened to be that all connections are staggered. The joints must be sealed with a polymeric binder, and a wave of the waterproofjacket must be sealed in place with the same material. Staples and copper-clad steel wire should be ensured in order to keep them in isolation place, and then the circular seams must be covered with at least two layers of waterproof tape to which plastic cement is used.
Fittings for pipes must be insulated with at least two layers of hair felt (Fig.
4.6), built before the thickness of the coating of pipes; but before felt located around the fittings, the bare ends of pipes, insulation should be coated with plastic cement.
After she felt two layers of waterproof tape and plastic cement should be applied to protect from moisture. The isolation of this type are designed for installation in buildings, where it will be, as a rule, are protected from the outside weather conditions. When the outside of the pipe should be isolated, one of the best types of pipe coating shall be used. In all cases, the manufacturer's recommendations should be conducted in the form of the application.
Hair-Felt Insulation
Hair-felt isolation, as a rule, of pure cattle hair specially prepared and purified. This is a very good insulator of heat, due to its low thermal conductivity. Its installed the price is slightly lower than in the tube, but it is more difficult to install and print properly and, therefore, should be implemented with average quality of manufacture. Prior to installation, piping should be clean and dry and then prepared by applying the thickness of a water-proof paper or tape spiral wound, over which the hair, felt about 1 inch thick spiral wound on the desired length of the pipe. Then he closely tied with twine, wrapped up with the sealing tape to make it a completely sealed, and, finally, painted with waterproof paint. If more than one thickness of hair felt required, it must be built in layers of roofing felt between them. When you want to make joints around fittings, termination hair opinion, should be tapered down with the sealing tape and insulation applied to the fittings should overlap this cone and, thus, constantly snug fit.
It is important to remember that this type of insulation should be carefully protected from any infiltration of air or moisture, and even then, difficulties may arise after it was installed. At any point where air infiltration (or "breath"as it's called) is permitted to occur condensation will begin and travel long distances through pipelines, even undermine the isolation that is properly sealed.
There are several other types of pipe insulation available, but they are not widely used. They include different types of wrapped and felt isolated. All that insulation is used, it should be critically examined to see whether it will provide protection and constancy requires him; otherwise, it should never be considered. Although all of the refrigerant, components and fittings shall be covered, it is not recommended until the system was thoroughly leak-tested and operated for a time.
Pressure drop in different parts of the commercial refrigeration systems, due to friction in the pipes and the right choice of sizes to get the best results from operating activities, are important factors when installing the equipment. Through careful observation of the above, the detailed description of refrigeration piping and methods of installation of pipelines problem will be greatly simplified and as a result of proper operation of the system...
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Air-Conditioning