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The application of thermal pipe insulation introduces thermal resistance and reduces the heat flow. Thicknesses of thermal pipe insulation used for saving energy vary, but as a general rule, pipes operating at more-extreme temperatures exhibit a greater heat flow and larger thicknesses are applied due to the greater potential savings. [3]
This has triggered research on alternative insulating foam fitting the application, [3] which include polyethylene terephthalate (PET) [4] and polybutylene (PB-1). [5] The outer casing is usually made of high-density polyethylene (HDPE). Preinsulated pipes for district heating are described in European standards EN 253 and EN 15698-1.
R-Value 3.4 – 3.8 (RSI-0.60 – 0.67) per inch (imperial units) Loose fill insulation fills the wall cavity better than batts. Wet-spray applications typically seal even better than dry-spray. Class I fire safety rating; No formaldehyde-based binders; Not made from petrochemicals nor chemicals with a high toxicity
For example, a 4" pipe, with 1" of thermal insulation makes a 6" penetrant (1" pipe covering on each side of the pipe), plus two pipe sizes = an 8" sleeve, creating a 1" annulus. In case of insulated piping, the size of the insulation must be taken into account for the intended firestop certification listing.
Polyethylene plastic sheet, 4 or 6 thou (0.10 or 0.15 mm), 0.03 US perm (1.7 SI perm). Advanced Polyethylene vapor retarders that pass the ASTM E 1745 standard tests ≤0.3 US perm (17 SI perm). Asphalt-coated kraft paper, often attached to one side of fiberglass batts, 0.40 US perm (22 SI perm). Metallized film
Examples of renovation are post-insulation of a cavity wall and post-insulation of a sloping roof against the roof boarding or under the tiles. Note that every renovation must meet the minimum Rc value of 1.3 W/(m 2 ⋅K). If the current insulation has a higher insulation value (the legally obtained level), then this value counts as a lower ...
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