Different pipe fittings to use different pipes, pipe quality directly determines the quality of pipe fittings. Here is a look at the classification of pipe:
1, water supply pipe material
There are copper pipe, aluminum-plastic composite pipe, ABS plastic pipe, polyethylene pipe, polypropylene pipe and so on.
(1) copper pipe: copper pipe (also known as copper pipe), commonly used in water pipes, heating and cooling pipes, as the installation of a hard, not easy to corrosion, high temperature, high pressure and other advantages, can be used in different environments. Copper tube combines the advantages of metal and non-metal pipes in a body, leading in cold and hot water system, is the best connection pipe. The copper tube is fire resistant and heat resistant, and can maintain its shape and strength at high temperatures, and there will be no aging phenomenon.
The coefficient of linear expansion of copper tube is very small, which is 1 / 10 of plastic tube. It will not cause stress fatigue fracture due to excessive thermal expansion and cold contraction. The strength of the steel pipe is greater, and the outer diameter is smaller under the requirement of ensuring the effective inner diameter, which is more suitable for underground burial.
(2) aluminum-plastic composite pipe: aluminum-plastics composite pipe has better thermal insulation performance, internal and external walls are not easy to corrosion, because the inner wall is smooth, the fluid resistance is small; And because it can be bent at will, the installation and construction are convenient. As a water supply pipe, aluminum-plastic composite pipe has sufficient strength.
If the lateral force is too large, it will affect the strength, so it should be built or buried in the wall, or even buried underground. (Aluminum plastic composite pipe can also be buried in the ground, such as the pipe used in the floor heating is aluminum plastic compound pipe) aluminum composite pipe connection is card sleeve type (also can be card pressure type), Therefore, the construction of one is to pass strict pressure test, test connection is solid. The second is to prevent frequent vibration, so that the card set loose. Third, the length of the direction of the installation should be left enough to avoid pulling off.
ABS plastic pipe: ABS is a new material, Nominal pressure 0.6 ~ 1.6 Mpa, linear expansion coefficient 0.9 mm / (m · °C), the connection for the flange, adhesive, anti-gas permeability. ABS plastic pipe flow friction is small, greatly reducing fluid resistance and pump horsepower, impact resistance is good, good mechanical strength and high; Impact toughness, in the event of sudden attack only ductile deformation.
ABS plastic pipe ratio of 1 / 7 of steel to reduce the structure weight; Low fluid resistance; Chemical stability, good sealing performance; The plastic pipe reduces the consumption of raw materials, reduces the labor intensity, and greatly saves the investment of the project, the construction is simple, the effect is good, the curing speed is fast, the adhesive strength is high, and the phenomenon of leakage and leakage existing in the general pipeline is avoided.
At present, China’s municipal pipe market, plastic pipe is steadily developing, PE pipe, PP-R pipe, UPVC pipe have a place, of which PE pipes strong momentum of development is the most remarkable. PE pipe is used in a wide range of areas. Water and gas pipes are the two largest application markets.
PE resin, is formed by the polymerization of ethylene monomer, because the polymerization reaction conditions of pressure, temperature and other different, Different densities of resin can be obtained, and there are high density polyethylene, medium density polyethylene and low density polyethylene points.
Polypropylene Pipe: The polymer material has a low heat distortion temperature (100 °C), low transparency, low gloss, low rigidity, The impact strength of PP increased with the increase of ethylene content. Vicat softening temperature of PP is 150 °C. Due to a high degree of crystallinity, this material has good surface stiffness and anti-scratch resistance. PP has no environmental stress cracking problem. Mainly used in chemical, petroleum, chlor-alkali, pharmaceuticals, dyes, pesticides, food, metallurgy, electroplating, environmental protection, water treatment and other industries.
2, drainage pipe
There are steel pipe, cast iron pipe, PVC plastic pipe.
(1) Steel pipe: steel with a hollow section, the length of which is much greater than the diameter or circumference. According to the section shape is divided into circular, square, rectangular and profiled steel pipe; According to the material into carbon structural carbon steel pipe, low alloy structural steel tube, alloy steel tube and composite steel pipe. According to the use divided into transmission pipeline, engineering structure, thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, high-pressure equipment pipe, etc. According to the production process divided into seamless steel pipe and welded steel pipe, seamless steel tube and one of the two points hot rolled and cold rolled (pull) (two), welded pipe straight seam welding pipe and spiral seam welding steel pipe.
Steel pipe is not only used for conveying fluid and powdery solids, exchanging heat energy, manufacturing machine parts and containers, it is also an economic steel. It can reduce weight, save metal by 20 ~ 40% and realize factory mechanization construction. Using steel pipe to make highway bridge can not only save steel, simplify construction, but also greatly reduce the area covered with protective layer and save investment and maintenance cost.
(2) Cast Iron Pipe: Cast iron pipe. Cast iron pipe is used for water supply, drainage and gas transmission lines, It includes cast iron straight pipe and pipe fittings. Low labor intensity. According to the casting method, divided into continuous cast iron pipe and centrifugal cast steel pipe, which centrifugal cast iron pipes are divided into two kinds of sand and metal. According to the material, it is divided into gray cast iron pipe and nodular cast iron steel pipe. According to the interface form is divided into flexible interface, flange interface, self-anchored interface, rigid interface.
(3) PVC plastic pipe: its main component is a large number of PVC, in addition to some other materials used to enhance its toughness and ductility. The surface of the material is a thick film of paint and below it is an adhesive. Very popular with consumers, is a very popular synthetic material. The usage rate is the second place in all materials. Pvc plastic pipe is actually just a vacuum plastic mold, mainly acting on the surface of various materials, all also known as decorative film.
3, heating, gas pipe
There are galvanized steel pipe, CPVC plastic pipes, ABS plastic pipe and so on.
Galvanized steel pipe: hot-dip galvanized steel pipes are widely used in construction, machinery, coal mine, chemical industry, electric power, railway vehicles, automobile industry, highway, bridge, container, sports facilities, agricultural machinery, petroleum machinery, prospecting machinery and other manufacturing industries. Welded steel pipe with hot dip or electrolytic zinc plating on the surface. Galvanized steel pipe can increase corrosion resistance and prolong service life. Galvanized pipe is widely used, in addition to water, gas, oil and other general low pressure fluid pipeline pipe, Also used for the oil industry, especially marine oil fields of oil well pipe, pipeline, chemical coking equipment oil heater, condensation cooler, coal distillation wash oil exchanger pipe, as well as trestle pile, mine tunnel support frame pipe.
(2) CPVC plastic pipe: CPPVC pipe is a new type of water supply pipe material produced by extruding PVC resin as the main raw material. Its use is the greatest advantage of high temperature. If there is a large proportion of graphite filler in the raw material of forming CPVC pipe, it can also be used to make heat conducting pipe, This pipe in the domestic application only in recent years began, multi-purpose in cold and hot water delivery, thermochemical solution and waste liquid delivery pipeline, long-term use of infusion temperature up to 120 degrees Celsius, life as long as 40 years.
ABS plastic pipe: ABS is a new material, Nominal pressure 0.6 ~ 1.6 Mpa, linear expansion coefficient 0.9 mm / (m · °C), the connection for the flange, adhesive, anti-gas permeability. ABS plastic pipe flow friction is small, greatly reducing fluid resistance and pump horsepower, impact resistance is good, good mechanical strength and high; Impact toughness, in the event of sudden attack only ductile deformation. The proportion of ABS plastic pipe is 1 / 7 of steel to reduce the structure weight; Low fluid resistance; Chemical stability, good sealing performance; The plastic pipe reduces the consumption of raw materials, reduces the labor intensity, and greatly saves the investment of the project, the construction is simple, the effect is good, the curing speed is fast, the adhesive strength is high, and the phenomenon of leakage and leakage existing in the general pipeline is avoided.