The Beijing Standard DBJ/T01-49-2000 "Technical Specification for the Application of Cryogenic Floor Radiant Heating," which was implemented on October 1, 2000, clearly stipulates that only four types of pipes can be used for low-temperature hot water floor radiant heating: cross-linked aluminum Plastic composite pipe (XPAP), polybutadiene pipe (PB), cross-linked polyethylene pipe (PEX), random copolymer polypropylene pipe (PP-R), the following add everyone to introduce:
First, cross-linked aluminum plastic composite pipe (XPAP)
The inner layer and the outer layer are polyethylene or copolymers with a density of ≥ 0.94 g/cm3, and the middle layer is a reinforced aluminum tube. Layers of hot-melt adhesives are closely bonded to one another. In theory, its internal pressure resistance and external pressure resistance are large, and its strength is the highest among the four types of pipes. Yes, but the price is high.
We talk about the harm of oxygen penetration by the way: The excessive oxygen content in the circulating water of the heating medium is the main reason for the formation of oxidative corrosion of iron and steel materials. Among them, the steel radiator made of thin steel plate as the main material is the weakest. General plastic pipes have oxygen penetration problems. Therefore, when the same heat source water system is shared with other heating systems, and when other heating systems use erodible components such as steel radiators, the requirement of an oxygen barrier layer is proposed.
Aluminum plastic pipe does not rebound during construction, easy to form, large radius of curvature R ≥ 6D, D is the pipe diameter.
Second, polybutylene pipe (PB)
The polybutene-1 resin is added with an appropriate amount of additives, and the extruded thermoplastic pipe is called soft gold in the international market. Can be welded, long-term temperature, pressure performance is very good. But its price is the highest of the four materials, and the heat transfer is also poor, only 0.33w/m
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