Home furnishings Guide: floor heating can use several pipes

1 October 2000 to begin implementation of the Beijing standard DBJ/T01-49-2000-temperature floor heating application technology for expressly provides for low-temperature radiant floor heating pipe only 4: xpap (XPAP), butadiene and thin tube (PB), cross-linked polyethylene pipe (PEX), copolymer tube (PP-R), here I am to be on:

I. xpap (XPAP)

The inner and outer for density ≥ 0.94 grams/cubic centimeter of polyethylene or copolymer, middle-tier to reinforced aluminum tube. Interlaminar adhesion with hot melt glue close to one of the pipes, in theory, its resistance to internal pressure, resistance to external pressure capabilities are larger, its strength in the four pipe of the highest oxygen permeability from blocking on the best, but the price is high.

We dropped in to talk about the hazards of oxygen permeability: htm in the circulating water, the oxygen content is formed steel oxidation and corrosion of the main reasons, including, in particular, to use the sheet steel is the main material of the weakest steel radiators. General plastic pipes are oxygen permeability, and other heating systems share the same centralized heat source water systems and other heating system using steel radiator etc corrosive components, made a stop at the request of the oxygen layer.

Aluminum pipes not rebound in construction, easy forming, bending radius larger R = outer diameter, D-6D.

Second, polybutylene pipes (PB)

Is to polybutene-1 resin adding just the right amount of additives, the extrusion thermoplastic tubing, polybutylene in international markets is called soft gold. Soluble, long-term temperature and pressure resistance is very good. But its price is in four kinds of material, heat resistance, also weak 0.33w/m.k, applicable to

High quality building. PB pipe in oxygen permeation rate is the highest in the material, it also has a rebound, but its pipe relatively soft, pliable, easily construction. European provisions must band-stop oxygen layer, but domestic PB pipe are not. PB pipe in common card ring connection is using a card with barbed, piercing wall connection. Piercing the depth reached nearly 30 per cent, which is left for future leakage problems. Its bending radius R = 5D.

Third, cross-linked polyethylene pipe (PEX)

With density ≥ 0.94g/cm3 of polyethylene or ethylene copolymer, adding just the right amount of additives, chemical or physical methods, linear macromolecules crosslinked into the three-dimensional mesh, which kind of macromolecular materials tubing, called Crosslinking polyethylene pipes. Abroad do floor heating use crosslinked pipe up, its advantages are: long-term temperature pressure resistance is good, the price is cheap. The disadvantage is not only used for fusion welding, mechanical clamping connection, tube bending a rebound, bending radius R = 5D.

Fourth, copolymer (PP-R)

A moderate amount of propylene and ethylene copolymer, adding just the right amount of additives, the extrusion thermoplastic pipes, weld, the low price, the bending radius, R = 6D because allowable stress is smaller and fatter pipes, causing such material is not easy to bend, larger construction up springback, it used in the construction of an inline-type discharge method, do not use rotary discharging method, pipe blockage is large, difficult to recycle, heat transfer is not good, m.k, 0.37w/domestic market more confusing pp, some foreign merchants use domestic users of modified polypropylene products do not understand to PP-B products (yellow) impersonate PP-R products (grey) applied to the floor heating, causing confusion in the market, so that we in the selection of pipe, be sure to distinguish between material to avoid shoddy. According to the technical specification for "PP-R warm as heating tube, direct contact with pp-r pipe fitting surface should be nickel-plated. Has for some time, we put the ethylene-propylene copolymer polypropylene (PP-R) tubes are collectively referred to as modified polypropylene (PP-C) tube. Which is PP-H PP-B and could not be applied to the floor heating pipe, in polypropylene (PP-C) pipe, only for floor heating tubes only PP-R.

These are our on the floor heating of pipes used to a brief presentation. Want to help you, we also recommend: in the tubing selection for high standards and strict demands, avoid fake, when using pipe the attention on correct use, prevent the temperature and pressure exceeds permissible conditions, also avoid exposure and trauma.