PPR pipe fittings PP-formally named pipes, is the largest home improvement project with a water supply pipeline.
PPR pipe fittings interface with hot-melt technology, are completely integrated into the pipe together, so once installed pressure tested and will not be further leakage, high reliability. This does not mean there is no defect PPR pipes water pipes, heat resistance, a less pressure more long-term working temperature should not exceed 70 ℃; each piece of limited length, and can not bend construction, long distance or if the pipeline the corner and more should be used in the construction of a large number of joints; pipe fittings cheap but relatively high prices. Speaking from the overall performance, PPR pipe fittings is the high cost of pipe, water pipe so as decoration material of choice for transformation.
The PPR pipe fittings on the market there are two colors, white and gray, why have this distinction, distributors of raw materials used in PPR response is caused by different particles.
General transformation in the water, existing water mains will be replaced, home improvement company and business persons in the proposed renovation to install PPR pipe fittings used when all the hot water pipes, even the cold water flowing through the parts with hot water pipes. Their argument is that because of the technical parameters of hot water than cold water pipes, and the price is little difference, so that transportation and transformation of all hot water pipes. Another fact is that even if you want to buy a cold water pipe on the market is also very difficult to buy because the cold water pipe only to be tooling market, not the supply of home improvement market.
PPR pipe fittings in diameters from 16mm diameter to 160mm, home improvement is mainly used in 20mm, 25mm two (known respectively in charge of 4, 6 charge), 4 of which used more in charge of something.
Abstract: PPR pipe fittings known of polypropylene pipes, polypropylene random copolymer with a pipe by extrusion, injection molding a tube. Europe's early development and application of 90 new plastic pipe products. PP-R in the '80s, using gas polymerization processes to make about 5% PE in the molecular chain of PP random uniform polymer (random copolymer) and a new generation of pipe materials. It has good impact resistance and long-term creep properties.
I. What is PPR pipe fittings?
PPR pipe fittings known of polypropylene pipes, polypropylene random copolymer with a pipe by extrusion, injection molding a tube. Europe's early development and application of 90 new plastic pipe products. PP-R in the '80s, using gas polymerization processes to make about 5% PE in the molecular chain of PP random uniform polymer (random copolymer) and a new generation of pipe materials. It has good impact resistance and long-term creep properties.
2, PP-R and PP-C What is the relationship?
The previous period, the domestic market appear PP-C pipe, pipe fittings, the installation method and PP-R line. Many people confused PP-R and PP-C What is the difference, resulting in a lot of misunderstanding and confusion. International standards, hot and cold water points polypropylene PP-H, PP-B, PP-R three, no PP-C. The market is actually PP-C PP-B pipe tubes, the raw material is polypropylene block copolymer type Pipe Compound. PP-B pipe is a kind of hot and cold water pipes, the price is cheaper, its heat resistance, pressure resistance and a great gap between PP-R. For example: use grade 2, the design pressure 0.6MPadn25mm pipe, PPR pipe fittings wall thickness of 3.5mm, PP-B (PP-C) pipe wall thickness to 5.1mm; design pressure 0.8MPadn25mm, PPR pipe fittings wall thickness of 4.2mm, The PP-B (PP-C) can not be used. Because the required wall thickness was too thick. Size of the market structure in line with the PP-R pipe PP-C, its use is much lower, not be confused with PPR pipe fittings used, not to use in determining the conditions to PP-C pipe replacement PPR pipe fittings. 2 use that design temperature 70 ℃, heating water used.
3, PPR pipe fittings What are the characteristics?
PPR pipe fittings plastic pipe in addition to the general light weight, corrosion resistance without fouling, and long service life, but also has the following main features:
1, non-toxic and health. PP-R raw material elements only carbon, hydrogen, there is no harmful toxic elements, health can be *, not only for hot and cold water pipes, can be used to clean drinking water systems.
2, thermal energy. PPR pipe fittings thermal conductivity 0.21w/mk, only steel of 1 / 200.
3, good heat resistance. PPR pipe fittings of the Vicat softening point of 131.5 ℃. Maximum working temperature of up to 95 ℃, can meet the specification of building water systems use hot water requirements.
4, long service life. PPR pipe fittings at working temperature 70 ℃, working pressure (PN) 1.OMPa conditions, the service life of up to 50 years; room temperature (20 ℃) service life of up to 100 years.
5, easy installation, connect to *. PP-R has good welding properties, pipe, tube and fused melt can be used to connect, easy installation, connection to * the strength of joints is greater than its own strength pipe.
6, recyclable materials. PP-R waste, cleaned, broken recycling in the pipe and tube production. Amount of recycled material does not exceed 10% of the total, does not affect product quality.
4, PPR pipe fittings mainly used what?
1, the building of hot and cold water systems, including central heating systems;
2, the building's heating system, including floor, wall and radiant heating systems;
3, can be directly purified drinking water supply system;
4, Central (concentration) air conditioning system;
5, transport or discharge of chemical media such as industrial piping systems.
5, PPR pipe fittings and several plastic hot and cold water what is the difference? Table varieties
6, how that is safe and economical use PPR pipe fittings?
1, note that the overall channel usage factor C (the safety factor) to determine:
General situation, and make long-term continuous temperature <70 ℃, optional C = 1.25; on important occasions, and long-term continuous use temperature ≥ 70 ℃, and may run longer at higher temperatures, an optional C = 1.5;
2, for cold water (≤ 40 ℃) system, used P.N1.0 ~ 1.6MPa pipe and pipe fittings;
≥ PN2.0MPa selected for water heating pipes and fittings.
3, in considering the above three principles, the pipe fittings should be not more than SDR pipe SDR, the pipe wall thickness shall be not less than the same size pipe wall thickness.
7, PPR pipe fittings installed in construction in which the problem?
1, PPR pipe fittings lower than the hardness of metal pipes, poor rigidity in the transportation, construction should be protected from mechanical damage caused by inappropriate external force. Deposited in the dark after the pipe to mark the location, so as not to damage the second fitting pipe.
2, PPR pipe fittings5 ℃ less certain low-temperature brittleness, construction in winter be careful, use sharp knives when cutting pipe cutting slowly. Pipeline can not be installed on the pressure, percussion, if necessary, to protect vulnerable to external sites covering material.
3, PPR pipe fittings aging of long-term degradation by ultraviolet radiation easily installed outdoors or in direct sunlight must be packed dark protective layer.
4, PPR pipe fittings and metal pipe or water in addition to connect using the flange with a threaded insert or other mechanical connection, the rest should be connected with hot-melt, so that the integration of pipeline, no leakage point.
5, PPR pipe fittings of the linear expansion coefficient larger (0.15mm / m ℃), installed in the next dark compresses or buried pipe must be taken to prevent pipe expansion and deformation of technical measures.
6, pipe installed in a sealed tube (buried) and the decorative covering layer (non-buried dark dressing) before pressure testing. Cold water pressure system, pressure test of 1.5 times the working pressure, but not less than 10MPa; hot water test pressure for the working pressure of 2 times, but not less than 1.5MPa. Pressure test of time and methods of technical rules of order.
7, PPR pipe fittings for surface or buried Concealed piping must be installed in accordance with the provisions of support, hanger.