What factors need to be considered when choosing a pipeline?

Pipeline - determination of pipe diameter When the flow rate of the fluid is known, the size of the pipe diameter depends on the allowable flow rate or the allowable friction resistance (pressure drop). When the flow rate is large, the pipe diameter is small, but the pressure drop value increases. Therefore, pipeline infrastructure investment can be saved when the flow rate is large, 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 comprehensive consideration of construction investment, operating costs and other technical factors.

Pipe-to-pipe connection The connection method between pipes, pipe joints, valves, and inlet and outlet pipes on equipment is determined by the properties, pressure and temperature of the fluid, as well as the material, size and installation location of the pipes. There are 4 methods of flange connection, socket connection and welding:

①Threaded connection: mainly suitable for small diameter pipes. When connecting, it is generally necessary to wrap fluoroplastic sealing tape or paint thick paint, and wrap around hemp wire and other sealing materials on the threaded connection part to prevent leakage. When the pressure is above 1.6 MPa, gaskets are generally added to the end face of the pipe to seal. This connection method is simple and can be disassembled and reassembled, but a union must be installed at an appropriate place in the pipeline to facilitate disassembly and assembly.

②Flange connection: the applicable diameter range is large. When connecting, choose different flanges and gaskets according to the nature, pressure and temperature of the fluid, and use bolts to clamp the gasket to keep it sealed. Flange connections are mostly used at pipe sections that need to be disassembled frequently and where pipes and equipment are connected.

③Socket connection: It is used for the connection between cast iron pipes, concrete pipes, clay pipes and their connecting parts. It is only suitable for water supply, drainage and gas pipelines working under low pressure and normal temperature conditions. When connecting, generally fill the groove of the socket with hemp silk, cotton thread or asbestos rope, and then fill it with asbestos cement or lead. flexibility, allowing a small amount of movement of the tube.

④Welded connection: This type of connection has the best strength and tightness, and is suitable for various pipelines, saving labor and materials, but the pipe and pipe joints must be cut off when disassembling.