Pipe-Pipe Diameter Determination When the flow rate of […]
Pipe-Pipe Diameter Determination When the flow rate of a fluid is known, the size of the pipe diameter depends on the allowable flow rate or the allowable frictional resistance (pressure drop). When the flow rate is large, the pipe diameter is small, but the pressure drop value is increased. Therefore, when the flow rate is large, the investment in pipeline infrastructure can be saved, but the operating energy cost of power equipment such as pumps and compressors increases. In addition, if the flow rate is too large, there may be some other unfavorable factors. Therefore, the pipe diameter should be determined based on construction investment, operating costs and other technical factors.
The connection method between the pipe-pipe joint pipe, the pipe coupling, the valve and the inlet and outlet pipe on the equipment is determined by the nature of the fluid, the pressure and temperature, and the material, size and installation location of the pipe, mainly with threaded connection and method. Four methods: blue coupling, socket coupling and welding: 1 threaded connection: mainly suitable for small diameter pipes. When connecting, it is generally necessary to wrap the fluoroplastic sealing tape or apply thick lacquer and wrap the sealing material on the threaded joint to prevent leakage. At pressures above 1.6 MPa, a gasket seal is typically applied to the end of the tube.
This type of coupling method is simple and can be disassembled and reassembled, but the joints must be installed in the appropriate places of the pipe to facilitate disassembly and assembly. Flange connection The applicable diameter range is large. When connecting, select different flanges and gaskets according to the nature, pressure and temperature of the fluid, and use bolts to clamp the gasket to keep the seal. Flange connections are mostly used in pipe sections that require frequent disassembly and where piping and equipment are connected. 3 socket connection: used for the connection between cast iron pipe, concrete pipe, clay pipe and its couplings, only for water supply, drainage and gas pipelines working under low pressure and normal temperature conditions.
When connecting, generally insert the hemp, cotton or asbestos rope in the groove of the socket, then fill it with asbestos cement or lead material, and fill the rubber seal ring in the socket to make it better. The flexibility allows for a small amount of movement of the tube. 4 Welded joints: This joint has the best strength and tightness. It is suitable for all kinds of pipes, saving labor and materials, but it must cut off the pipe and pipe joints during disassembly.Pipeline-pipeline laying in the city Water supply, drainage, heating, gas supply pipelines and long-distance oil and gas pipelines are mostly laid underground, and the process pipes in the factory are easy to operate and repair more on the ground. . Pipeline travel, support, slope and drainage, compensation, insulation and heating, corrosion and cleaning, identification and painting, and safety are important issues for both above-ground and underground laying.
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