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    Home > Coatings News > Paints and Coatings Market > Basic knowledge of pipes

    Basic knowledge of pipes

    • Last Update: 2020-06-12
    • Source: Internet
    • Author: User
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    First, steel pipe according to its manufacturing methods are divided into seamless steel pipe and welded steel pipe two kindsSeamless steel pipe is made of high-quality carbon steel or alloy steel, with hot-rolled, cold-rolled (pulled) pointsWelded steel pipe is made of steel plate rolled into tubes to seam or spiral seam welding, in the manufacturing method, but also divided into low-pressure fluid transport welded steel pipe, spiral seam welded steel pipe, direct coil welding steel pipe, electric welding pipe and so onSeamless steel pipes can be used in a variety of liquids, gas pipes, etcWelding pipes can be used for water pipelines, gas pipes, heating pipes, etc1 Welded steel pipe 1.1 welded steel pipe with low-pressure fluid transport and galvanized welded steel pipe low-pressure fluid transport welded steel pipe, is made of carbon soft steel, is the most commonly used pipe in pipeline engineering a small diameter pipe, suitable for the delivery of water, gas, vapor and other media, according to its surface quality, divided into galvanized pipe (commonly known as white iron pipe) and non-galvanized pipe (black iron pipe)The inner and outer walls are coated with a zinc protective layer of about 3%-6% heavier than non-galvanizingAccording to the different pipe wall thickness is divided into: thin wall tube, ordinary tube and thickened pipe threeThin-walled tubes should not be used in conveying media and can be used as casings1.2 Straight-stitch edweled steel pipe straight-seam steel pipe straight-seam coil welded steel pipe, can be divided into welded steel pipe and on-site steel plate block roll welded into straight-seam coil welded steel pipeCan be made into several tube wall thickness1.3 Spiral seam welded steel pipe spiral welded steel pipe is divided into automatic buried arc welded steel pipe and high-frequency welded steel pipe two kindsA spiral seam automatically buried arc welded steel pipe according to the pressure of the conveying medium is divided into Class A pipe and Class B pipe two categoriesClass A tube generally with ordinary carbon steel Q235, Q235F and ordinary low alloy structure steel 16Mn welding, Class B pipe using Q235, Q235F, Q195 and other steel welding, used as low-pressure fluid delivery pipe B helix high-frequency welding steel pipe welding high-frequency steel pipe, still not unified product standards, generally using ordinary carbon steel Q235, Q235, etc2 Seamless steel pipe seamless steel pipe according to the manufacturing method is divided into hot-rolled pipe and cold-pulled (rolled) pipeThe maximum nominal diameter of the cold-drawn (rolled) tube is 200mm and the maximum nominal diameter of the hot-rolled tube is 600mmIn pipe engineering, when the pipe diameter exceeds 57mm, hot-rolled pipe is often used, and the pipe diameter is less than 57mm when the cold-pulled (rolled) pipe is commonly usedThere are three kinds of seamless steel pipecommon in pipeline engineering: 2.1 general seamless steel pipe general seamless steel pipe referred to as seamless steel pipe, with ordinary carbon steel, high-quality carbon steel, ordinary low alloy steel and alloy structure steel manufacturing, used to make the transmission of liquid pipes or production structures, partsSeamless steel pipe according to the outer diameter and wall thickness supply, in the same outer diameter under a variety of wall thickness, the pressure range is largerUsually the length of the steel pipe, hot-rolled pipe is 3 to 12.5 m, cold-drawn (rolled) pipe is 1.5 to 9 m2.2 Seamless steel pipe with seamless steel pipe with low-medium-pressure boiler is made of high-quality carbon steel 10 and 20, operating temperatureThe cast iron pipe of the second cast iron tube is made of raw ironAccording to its manufacturing methods can be divided into: mould centrifugal tube, continuous cast iron straight pipe and mould iron pipeAccording to the material used in different can be divided into: gray mouth iron pipe, ball ink cast iron pipe and high silicon iron pipeCast iron pipes are mostly used in plumbing projects such as water supply, drainage and gas1 To water cast iron pipe 1.1 mould centrifugal cast iron straight pipe mould centrifugal cast iron straight pipe material is gray cast iron, suitable for water and gas and other pressure fluid transmission1.2 Continuous cast iron straight pipe continuous cast iron straight pipe, that is, continuous cast of gray cast iron pipe, suitable for water and gas and other pressure fluid transport2 Drainage cast iron pipe ordinary drainage cast iron pipe and pipe fittingsFlexible anti-seismic interface drainage cast iron straight pipe, such cast iron pipe with rubber ring seal, bolt fastening, under internal water pressure has a good flexibility, scalabilityCan adapt to large axial displacement and transverse deformation, suitable for high-rise building indoor drainage pipe, especially suitable for seismic areasThree non-ferrous metal pipe 1 aluminum and aluminum alloy tube aluminum and aluminum alloy, refers to the aluminum containing 98% of the industrial pure aluminum and aluminum as the main pull of copper, magnesium, manganese, zinc, chromium and other alloy elementsAluminium and aluminum tubes are formed by the pull or extrusion of industrial pure aluminum or aluminum alloysAluminum has better acid resistance 2 Copper and copper alloy tube copper pipe is mainly made of pure copper, phosphorus deoxygenation copper, called copper pipe or copper pipe brass tube is made of ordinary brass, lead brass and other brass 3 lead and lead alloy pipe four, plastic tube plastic tube is generally plastic resin as raw material, added stabilizer, lubricants, etc , to plastic method in the pipe machine by squeezing processing Because it has the characteristics of light weight, corrosion resistance, beautiful appearance, no bad odor, easy processing and easy construction, it has been more and more widely used in construction projects Mainly used for housing construction of the water supply system pipe, drainage, exhaust and sewage sanitation pipe, underground drainage pipe system, rainwater pipe and wire installation with the wiring line pipe and so on Plastic pipes have thermoplastic tubes and thermoset plastic tubes The main resins used in thermoplastic tubes are PVC, polyethylene resin (PE), polypropylene resin (PP), polystyrene resin (PS), propylene Jing-butyl-styrene resin (ABS), polybutyene resin (PB), etc Table I shows a comparison of the characteristics and main uses of these plastic tubes (see table I) Table 1 the characteristics of several commonly used plastic pipes and the main use of comparative name characteristics of the main use of PVC pipe has better anti-pull, pressure strength, but its flexibility is not as good as other plastic pipes, corrosion resistance is good, the price is the cheapest in all types of plastic pipes, but at low temperatures more brittle bonding, plug-in ring connection, flange thread connection for residential life, industrial and mining, agricultural supply and drainage, irrigation, gas supply, exhaust pipe, wire ducts, rainwater pipe, industrial pipe resistance, The temperature of thermal deformation is 100 degrees C, excellent chemical resistance, flange threaded connection hot water pipe PE tube weight, good toughness, good low temperature resistance, non-toxic, cheaper, high impact strength, but low pressure, tensile strength heat dissolve Welding, flange threaded connecting drinking water pipes, rainwater pipes, gas pipes, industrial corrosion-resistant pipe PP pipe corrosion resistance, with better strength, high surface hardness, surface finish, with a certain high temperature resistance thermal welding, flange thread editing chemical sewage, seawater, Oil and irrigation pipes, used in indoor concrete floor heating system heating system HEATing pipe ABS pipe corrosion resistance is excellent, lighter weight, heat resistance is higher than PE, PVC, but the price is more expensive bonding, flange threaded sanitary ware with water pipes, pipelines, sewage pipes, underground cable pipes, high anti-corrosion industrial pipes and other PB pipe strength between PE and PP, flexible between EHD and PE, its outstanding characteristics are anti-worm inglision Chemical properties are also very good hot melt welding, flange threaded connection feed pipes, hot and cold water pipes, gas pipes, underground buried high pipe GRP pipe excellent corrosion resistance, light, high strength, designable performance good adhesive ring connection, flange connection widely used petrochemical pipelines and large caliber to Drainage pipe 1, building drainage with hard PVC pipe and pipe shipping with hard PVC (UPVC) pipe, fitting is PVL resin as the main raw material, added a special additive, in the pipe machine extruded and injection molding 1.1 Features (1) Excellent physical performance UPVC pipe, pipe corrosion resistance, high impact strength, low fluid resistance, no fouling, smooth inner wall, not easy to clog, and to meet the requirements of building materials refractive performance, aging resistance, long service life Indoor and buried life of more than 50 years, outdoor use up to 50 years (2) Light weight, easy to transport, storage and installation, conducive to speed up the progress of the project and reduce construction costs (3) Save construction costs, use UPVC pipe, pipe than the same specifications of the cast iron pipe system cost is low, and easy to repair 1.2 application is applicable to the drainage system in the building, in considering the chemical resistance of the pipe and the conditions can also be used in industrial drainage systems, at temperatures below 60 degrees C can be used continuously, at 80 degrees C temperature can be used intermittently 2 Water supply with hard PVC plastic pipe and fittings for water with hard PVC plastic pipe and fittings is food hygiene grade PVC resin as the main raw material, added non-toxic special additives, by mixing, plasticization, crowding out or injection Products in line with the national drinking water hygiene standards, the use of bonding, elastic sealing ring, metal joints and other connection seiswells 2.1 features (1) excellent physical performance, UPVC water pipes, fittings impact strength is high, smooth surface, low fluid resistance, water transmission capacity of the same type of steel pipe 120%, and not easy to scale, long-term use of water transmission capacity is not reduced (2) resistant to corrosion, not rust, not due to the erosion and material action in soil and water and corrosion damage, the general life of more than 50 years (3) The thermal conductivity is small, and the use of winter is not easy to freeze and crack (4) Light weight, easy to transport, storage and installation, high labor efficiency, is conducive to speed up the progress of the project and reduce construction costs 2.2 The use is mainly used in civil residential indoor water supply system, replacing the traditional white iron pipe and fittings, and can be used for drainage, sewage, transport corrosive fluids and other systems It can also be used to transport water supply pipes for buildings (overhead or buried) with temperatures below 45 degrees C 3 compound foaming hard PVC tube composite foaming hard PVC tube is a variety of PVC formula three layers of co-squeezing, through this modified PVC inner and outer cortex and hive-like structure core layer, so that the composite foaming hard PVC pipe not only has the traditional PVC solid wall pipe better than cast iron, copper pipe characteristics, more traditional PVC solid wall tube, cast iron pipe and steel pipe incomparable characteristics Composite foaming hard PVC pipe is a new type of plastic pipe developed in China in recent years 3.1 features products have light weight, cost you, low fluid resistance, acid and alkali resistance, long service life, high mechanical strength, good sound insulation, strong electrical insulation, simple construction, heat and cold resistance and so on 3.2 Applications are suitable for low-pressure water supply pipes, drainage, sewage pipes, indoor air conditioning and ventilation pipes, exhaust pipes, wire and cable casings, hot and cold fluid pipes and chemical and pharmaceutical pipes in industrial and residential buildings 4 hard PVC electrical special pipes and connectors to PVC resin as raw materials, with special additives, plasticized, extruded and made 4.1 features with good refractory performance, corrosion resistance, climate resistance, light, beautiful, low cost, product support, construction convenience and so on 4.2 The use is applicable to various buildings for indoor and outdoor (light, dark) electric chlorine installation casing, play a beautification of indoor environment, fire, safety, insulation and wire decoration 5 soft PVC plastic tube to PVC resin as raw material, with plasticizers, stabilizers and other auxiliary agents, by the combination, agent out and made 5.1 features have the advantages of light weight, corrosion resistance, good electrical insulation performance, convenient construction and so on 5.2 applications are applicable to electrical casings and fluid conveyor pipes, at room temperature electric casingcans can be used to protect wires, cables, liquid conveyor tubes can be used to transport certain liquids and gases 6 polyethylene plastic tube to polyethylene resin as raw material, with a certain amount of additives, extruded molding processing 6.1 features are lightweight, corrosion-resistant, non-toxic, easy to bend, easy to construct and so on 6.2 varieties of high-pressure (low density) polyethylene and low-pressure (high density) polyethylene two The former is soft, the mechanical strength and melting point are lower, the latter has a higher density, a higher rigidity, and a higher mechanical strength and melting point 6.3 The application is applicable to industrial and civil housing, as drinking water pipes, rainwater pipes, gas pipes, industrial corrosion-resistant pipes, transport liquids, gases, edible media, etc., but also as medical hoses 7 polyethylene bellows to high-density polyethylene resin as raw materials, with a certain amount of additives, plasticized, derived from the agent 7.1 features with light, corrosion-resistant, aging resistance, product strength, good bending performance and easy construction and installation and so on 7.2 Applications are suitable for cable casings, underground cable pipes, agricultural irrigation pipes, ventilation pipes, water pipes, etc 8 polypropylene plastic tube to polypropylene resin as raw material, add the appropriate stabilizer, extruded into the processing 8.1 features are lightweight, corrosion-resistant, heat-resistant, easy-to-build and so on 8.2 Applications are applicable to chemical, petroleum, electronics, pharmaceutical, catering and other industries and a variety of civil buildings to transport fluid media (including corrosive fluid media) It can also be used for water pipes, agricultural drainage and irrigation, irrigation pipes and electrical insulation pipes 9 acrylonitrile-butadiene-styrene tube (ABS) tube ABS tube is acrylonitrile-butadiene-styrene of the three-way copolymer as the main material, by extrusion and molding ABS for tubes and fittings, of which the minimum content of butadiene is 6%, the minimum accountant of acrylonitrile is 15%, and the minimum accountant of styrene or its substitutes is 25% 9.1 features ABS plastic tube light, has a high impact strength and surface hardness, in the range of -40 degrees C to 100 degrees C can still maintain toughness, robustness and stiffness of its corrosion resistance, impact resistance performance is better than PVC tube ABS tubes can maintain heat and heat more than copper tubes and brass pipes, and avoid cold, weather, handling and transportation damage When subjected to a high erstlying yield strain, it can be restored to its original size without damage Therefore, it can replace stainless steel pipe, copper pipe and other pipe 9.2 Use ABS pipes are suitable for domestic water supply, sewage, breathable systems, irrigation systems, submersible pumps, drinking water pipes, gas distribution pipes, bores, underground electrical pipes, or as industrial pipes for the transport of corrosive saline solutions, organic matter containing fluid corrosive agents (e.g crude oil and food) and pure chemicals or other sensitive products.
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