The plastic pipe is generally made of synthetic resin, that is, polyester as a raw material, adding a stabilizer, a lubricant, a plasticizer, etc., and is extruded in a pipe making machine by a "plastic" method. Because of its light weight, corrosion resistance, beautiful appearance, no bad smell, easy processing and convenient construction, it has been widely used in construction engineering. It is mainly used as piping, drainage, exhaust and sewage sanitary pipes, underground drainage pipe systems, rainwater pipes, and threading pipes for installation of wires for house construction.
Advantage
With the improvement of people's living standards, environmental awareness and health concerns, a green revolution in the building materials industry has been set up in the water supply and drainage field. According to a large number of water quality monitoring data, after the cold-galvanized steel pipe is used, the service life is less than 5 years, and the rust is serious. Residents have complained to the government departments, causing a social problem. Compared with traditional metal pipes, plastic pipes have the characteristics of light weight, corrosion resistance, high compressive strength, health and safety, low water flow resistance, energy saving, metal saving, improved living environment, long service life and convenient installation. The engineering community's favor and occupy a very important position, forming an unpredictable development trend.
Characteristics
Polypropylene tube
(1) In the current construction and installation works, most of the heating and water supply are PPR pipes (pieces). The utility model has the advantages of convenient and quick installation, economical and environmental protection, light weight, hygienic non-toxicity, good heat resistance, corrosion resistance, good heat preservation performance and long service life. The pipe diameter is one size larger than the nominal diameter. For example, PPR32 is equivalent to DN25, PPR63 is equivalent to DN50. The pipe diameter is divided into DN20, DN25, DN32, DN40, DN50, DN63, DN75, DN90, DN110. The pipe fittings are various in three-way, elbow, pipe hoop and variable diameter. , pipe plugs, pipe clamps, brackets, hangers. The hot water pipe is divided into two parts, the cold water pipe is a green strip pipe, and the hot water pipe is a red strip pipe. The valve has PPR ball valve, globe valve, butterfly valve, gate valve, and copper core inside the PPR material.
(2) Pipes are connected by welding, hot melt and threaded connections. The PPR tube has the most reliable hot melt connection, convenient operation, good air tightness and high interface strength. The pipe connection uses a hand-held fusion splicer for hot melt connection. Remove dust and foreign matter from pipes and accessories before connecting. When the red light of the machine lights up and stabilizes, align the pipe to be connected (piece) DN<50 hot melt depth is 1-2MM, DN<110 hot melt depth is 2-4MM. When connecting, the pipe end is rotated without rotation Insert into the heating jacket to a predetermined depth. At the same time, the tube is pushed onto the heating head without rotation to heat, and after the heating time is reached, the tube and the tube are immediately removed from the heating sleeve and the heating head, and the tube is quickly and non-rotatingly and evenly inserted into the required depth, so that A uniform flange is formed at the joint. The newly welded joint can be calibrated within the specified heating time, but rotation is strictly prohibited. When the pipe and the pipe are heated, excessive heating should be prevented to make the thickness thin. The pipe is deformed within the pipe fitting. Rotation is strictly prohibited during hot melt cannula and calibration. There must be no open flame at the operation site, and it is strictly forbidden to bend the pipe with an open flame. When the heated pipe and pipe are vertically aligned, the force should be light to prevent the elbow from bending. After the connection is completed, the pipe and the pipe must be tightly held for a sufficient cooling time, and after cooling to a certain extent, the hand can be released. When the PP-R pipe is connected with the metal pipe fitting, the PP-R pipe with the metal insert should be used as the transition. The pipe fitting and the PP-R pipe are connected by the hot melt socket, and are connected with the metal pipe fittings or the hardware fittings of the sanitary ware. When using a threaded connection, a polypropylene raw tape should be used as the sealing filler. If the faucet is connected to the mop pool, the inner elbow (threaded inside) is installed at the end of the upper PPR tube. During the installation of the pipeline, do not use excessive force to avoid damage to the threaded fittings and cause leakage at the joint. Pipe cutting can also be cut by special pipe: the pipe cutter blade should be adjusted to match the diameter of the pipe to be cut. When the rotation is cut, the force should be evenly applied. After cutting, the complete round of the complete rounder should be applied to the fracture. When the pipe is broken, the section should be perpendicular to the pipe axis and free of burrs.
(3) During the pipeline installation process, the hydraulic test may be carried out in layers or in a single set. The working pressure and test pressure of all pipelines are: low working pressure is 0.4Mpa, test pressure is 0.6Mpa, high and medium working pressure is 0.6Mpa, test pressure is 0.9Mpa. After the pipeline system is installed, Comprehensive inspection, check the installed pipes, valves, gaskets, fasteners, etc., all in accordance with the design and technical specifications, remove the fittings that are not suitable for testing with the pipeline, replace them with temporary short pipes, and close all openings. And irrigate from the lowest place and deflate from a height. Purge the pipeline that has passed the test pressure until the dirt is washed out, and do all the work of purging and cleaning records and pressure test records. The test pressure is 1.5 times the working pressure of the system, but not greater than the allowable pressure of the pipe. Water should be injected slowly during the test. Sealed inspection should be done after filling. The pressure should be gradually increased to the test pressure by hand pump, stabilized for 1h, the pressure drop is less than 0.05Mpa, then lowered to 1.15 times of the working pressure for 2 hours, and the appearance inspection, no leakage and no leakage pressure does not exceed 0.03Mpa is qualified.
(4) When installing, be careful not to touch sharp objects when handling and installing pipes to prevent damage to the pipes. During the installation of the pipeline, organic pollutants such as paint should be prevented from coming into contact with the pipes and fittings. The opening where the installation is interrupted or completed must be temporarily closed to prevent debris from entering. The water supply pipe system should be flushed with water before acceptance. The flushing water flow rate should be greater than 2m / s. When flushing, the dead angle should not be left. The taper should be opened at each water distribution point. The lowest point of the system should be equipped with a water discharge port. The cleaning time is controlled at the outlet of the flushing outlet. After the drinking water system is washed, it is also filled with 20-30 mg/l of free chlorine water to fill the pipeline for disinfection. Chlorine-containing water should be retained in the tube for more than 24 hours. After the pipeline is disinfected, it is flushed with drinking water and sampled and tested by the health management department. The water quality complies with the current national standard “Sanitary Standard for Drinking Water†before it can be delivered. Within 30 minutes, two boosts are allowed to rise to the specified test pressure. Pay attention to the conversion of the pipe diameter when budgeting and drawing. As shown in the paper sheet, the pipe (piece) of PPR25 is required for DN20. Be sure to use the same manufacturer's products, because the proportion of ingredients in different manufacturers' products is different. Will cause the bond to be weak or not bonded.
Hard polyvinyl chloride tube
(1) UPVC pipe (piece) is used for drainage. Due to its light weight, corrosion resistance and high strength, it is widely used in pipeline installation. Under normal circumstances, the service life is generally 30 to 50 years. The inner wall of UPVC pipe is smooth and the frictional resistance of the fluid is small, which overcomes the defect that the cast iron pipe affects the flow due to rust and scale. The pipe diameter is also larger than the nominal diameter. For example, DN100 is U-PVC110.DN150 is U-PVC160. Pipe fittings are divided into oblique three-way, four-way, elbow, pipe hoop, variable diameter, pipe plug, trap, pipe clamp and hanger.
(2) Drainage glue for connection. The adhesive must be shaken before use. Pipes and sockets must be cleaned. The smaller the gap between the sockets, the better the sanding of the joint surface with sand cloth or saw blade. The inner joint of the socket is evenly brushed once, and the rubber is glued twice before the socket is to be glued for 40~60s. After inserting into place, it should be noted that the glue drying time is appropriately increased or decreased according to climate change. Do not touch the water when bonding. After the pipe is in place, it must be placed in the ditch. After the joint is dry, backfilling should be started 24 hours after the joint is dry. When backfilling, the pipe will be filled with sand to leave the joint and then backfilled in large quantities. Use the same manufacturer's products. When the UPVC pipe is connected with the steel pipe, the steel pipe joint must be cleaned and glued. The UPVC pipe is heated and softened (but not burnt) and then placed on the steel pipe and cooled down. If the pipe clamp is added, it will be better. For the large-area damage of the pipe, it is necessary to replace the whole pipe, and the pipe joint can be used to replace the pipe. For the treatment of leakage at the solvent bond, a solvent method can be employed. At this time, the water in the tube is drained first, and a negative pressure is formed in the tube, and then the adhesive is injected on the pores of the leaking portion. Due to the negative pressure inside the tube, the adhesive will be sucked into the pores to achieve the purpose of stopping leakage. The lining method is mainly for the leakage of pipe through holes and joints. At this time, the same diameter pipe with a length of 15 to 20 cm is selected, and the longitudinal pipe is cut longitudinally, and the inner surface of the casing and the outer surface of the pipe to be supplemented are roughened according to the method of bonding the joint, and the sleeve is tightly attached to the water leakage after the glue is applied. The glass fiber method is prepared by using an epoxy resin and a curing agent to form a resin solution, and after impregnating the resin solution with a glass fiber cloth, it is uniformly wound around the surface of the pipe or the joint leakage, and is solidified to become a glass steel. Because the method is simple in construction, easy to master in technology, good in plugging effect and low in cost, it has high promotion and use value in anti-seepage trapping.
(3) The water pressure test of the pipeline or pipe network system must be carried out after bonding and drying for 24 hours. The water pressure test of the pipeline must comply with the national pressure test rules for non-metallic pipelines. For the test of the pipeline without joints, the length of the test is km1.5km, and the test length of the pipe with the joint is ≯1km. The test pressure of the pipeline or pipe network shall not exceed 1.5 times of the design working pressure, the minimum ≮0.5MPa, and the test pressure shall be kept for 2h or meet The special requirements of the design, no leakage is qualified. Budget, pay attention to the conversion of pipe diameter when cutting. Also be sure to use the same manufacturer's products to prevent the proportion of ingredients in different manufacturers' products. Will cause the bonding to be weak or not to be glued at all.
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