Definition and details of pipesDefinition and details of pipes
What is the pipe?
The tube is a hollow tube with a circular cross-section, which is used for transporting products. Products include fluids, gases, particles, powders, etc. Unlike pipes, the term "pipe" is used for size tubular products that are commonly used in pipes and piping systems. On this website, pipes meeting the following dimensional requirements will be discussed: ASME b36.10 welded Seamless Steel Pipe and ASME b36.19 stainless steel pipe.
Tube or tube?
In the pipe world, the term "pipe" will be used. Pipes are generally identified by nominal pipe size (NPS) and wall thickness is defined by schedule number (SCH).
The tube is usually specified by the outside diameter (O.D.) and wall thickness (WT), expressed by Birmingham wire gauge (BWG) or thousandth of an inch.
Pipe: NPS 1 / 2 Sch 40 has an outside diameter of 21.3mm and a wall thickness of 2.77mm.
Tube: 1 / 2 "x 1,5 od equal to 1,7 mm, wall thickness 1.5 mm.
The main use of pipes is in the small interconnection of the heat exchanger, instrument pipeline, compressor, boiler, and other equipment.
The engineering company has a materials engineer to determine the materials to be used in the piping system. Most of the tubes are made of carbon steel (depending on use) and are manufactured according to different ASTM standards.
Carbon steel pipes are strong, malleable, weldable, Machinable, reasonable, durable and almost always cheaper than pipes made of other materials. If the carbon steel pipe can meet the pressure, temperature, corrosion resistance and hygiene requirements, it is a natural choice.
Iron pipes are made of cast iron and ductile iron. It is mainly used for water, natural gas and sewage pipelines.
Plastic pipes can be used to transport corrosive fluids, especially for handling corrosive or harmful gases and dilute inorganic acids.
Other metal and alloy tubes made of copper, lead, nickel, brass, aluminum and various stainless steels can be easily obtained. These materials are relatively expensive and are often selected because of their special corrosion resistance to processing chemicals, good heat transfer or tensile strength at high temperatures. Copper and copper alloy are traditional materials for instrument line, food processing and heat transfer equipment. Stainless steel is being used more and more for these.
Some of the materials described above have been incorporated to form a lined piping system.
For example, carbon steel pipes can be lined with materials that can withstand chemical attack inside, allowing them to carry corrosive fluids. Liners (for example, Teflon ®) can be used after the pipe has been manufactured, so the entire pipe spool can be manufactured before the liner.
Other inner layers can be glass, various plastics, concrete, etc., and coatings such as epoxy, asphalt, Zink, etc. can be used to help protect the inner tube.
Many things are important in determining the right material. The most important ones are pressure, temperature, product type, size, cost, etc.
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