Pipe is one of the commonly used building materials in installation engineering. Understanding the content of pipe is helpful to improve the efficiency and accuracy of map recognition. At the same time, engaged in the construction cost industry personnel in the preparation of the bill of quantities of the accuracy of the description of the characteristics of the item has a great help, the following installation of some commonly used pipe to do one by one explanation
- Seamless steel tube
Seamless steel pipe is hollow two cross section steel pipe without welding seam, which is made by the process of hot rolling or cold drawing after a certain size of the die piercing machine. Thus the seamless steel pipe has a higher strength than the welded steel pipe, generally can withstand the pressure of 3.2-7.0MPa of 3.2 to 7.0 MPa.
Seamless steel pipe is commonly used in high-pressure heating systems and high-rise buildings in the cold and hot water pipe and steam pipe. Or for boiler, as superheated steam and high temperature and high pressure hot water pipe.
Due to the different uses of the seamless steel pipe, the pressure is different, So the thickness of the wall is also very different, so the seamless steel pipe specifications with outside diameter + wall thickness, such as δ 102 * 14 represents the outside diameter of 102mm, wall thickness of 14mm seamless steel tube. Connection methods are welding, flange, clamp, etc.
- Welded steel pipe
Welded steel pipe is seamless steel pipe, it is a seamless steel tube, the production is the tube embryo with different forming methods will be bent into the pipe, in the method of welding welding will be welded to the pipe. According to the nature of welding seam, it can be divided into straight seam pipe, thread seam pipe and double layer coil welded pipe. The welded steel pipe is galvanized steel pipe after galvanizing treatment.
Straight seam welded steel pipe is mainly used for conveying water, heating, gas and other low-pressure fluid; Spiral welded steel pipe can be divided into single-sided spiral and double-sided spiral. Single-sided spiral used for conveying water and other general purposes, double-sided screw is generally used for transporting oil and gas and other special purposes. Double layer coil welded steel pipe is generally used in industry, this time no more introduction.
Welded steel pipe and galvanized steel pipe specification, generally with nominal diameter DN, said, such as DN32, that nominal diameter of 32 pipe. Connection methods are welding, flange, clamp type, thread and so on.
- Cast iron pipe
Cast iron pipe to water and drainage cast iron pipes two, which is characterized by durable, corrosion resistance, used in corrosion resistant media and drainage engineering.
The Connection Modes of Cast iron pipe are Socket and Flanged, Socket cast iron pipe is suitable for sewage discharge, generally for artesian, do not bear the pressure, flanged cast steel pipe is characterized by easy assembly and disassembly, commonly used in transport such as sulfuric acid and alkali media.
The specification of the cast iron pipe is generally indicated by the nominal diameter DN. The connection methods are: welding, flange, socket and so on.
- Plastic pipe
The plastic pipe has the characteristics of light weight, corrosion resistance, easy forming and convenient construction. There are many kinds of plastic pipe, There are common polyvinyl chloride pipe (PVC pipe), rigid poly vinyl chloride (UPVC) pipe, polyethylene pipe, cross-linked polyethylene pipe (PE-X) tube, random copolymerization of polypropylene (PP-R) pipe.
Plastic pipe specifications generally with the outside diameter De said, but also useful nominal diameter DN said. Connection mode for hot melt connection.
- Composite pipe
The composite pipe is a kind of pipe based on the composite structure of metal and thermoplastic material, including steel-plastic composite pipe and aluminum-plastic composite tube.
Steel-plastic composite pipe: According to the different production and processing technology, there are inner coated plastic compound pipe, inner and outer coating plastic compound pipes, inner lining plastic compound tubes
Coating and lining plastic process is different: coating is in the pipeline wall or outer wall melting a layer of polyethylene resin PE, ethylene-acrylic acid copolymer EAA, epoxy powder, non-toxic polypropylene PP or non-toxic PVC PVC and other organic substances composed of steel-plastic composite pipe; PVC-U, PE, PPR and other plastic pipes of a certain thickness are placed on the inner wall of steel pipe. The steel pipe and the lining pipe are compounded into plastic lined composite pipe by thermal expansion process and cold drawing process.
Aluminum-plastic composite pipe: The middle layer is a layer of welded aluminum alloy, the inner and outer layer of polyethylene, the three layers of pipe made by gluing, mainly used for building water distribution branch pipe and water heater pipe.
PSP steel-plastic composite pressure pipe: steel-plastic compound pressure pipe to welded steel pipe as the center, the inner and outer layers of polyethylene plastic, using special hot melt adhesive, through the extrusion molding method to form a composite pipe.