Steel pipes for fluid transportation are mainly used to transport fluids under pressure. In addition to ensuring the strength and stiffness that meet the corresponding requirements, they are also required to ensure tightness. That is, the steel pipes are required to undergo hydraulic tests one by one before leaving the factory. For pressure pipelines, the media they transport are often flammable, explosive, toxic, corrosive, temperature- and pressure-sensitive media, so steel pipes should be used for fluid transportation. In actual engineering design, procurement and construction, it is often found that structural steel pipes are mixed with or replace steel pipes for fluid transportation, which affects the quality, causes hidden dangers or causes accidents, which is not allowed.
Standards and selection analysis of steel pipes for fluid transportation
There are many standards for steel pipes for fluid transportation. In practice, various steel pipes have different properties, processes, and media. The manufacturing methods, welding methods, materials, and specifications of steel pipes for fluid transportation are also different. In order to facilitate production, construction, maintenance, etc., it is better to distinguish different types of steel pipes and prevent the mixing or misuse between steel pipes for fluid transportation and other types of steel pipes.
Steel pipes for low pressure fluid transportation
GB/T3091 "Galvanized Welded Steel Pipe for Low-Pressure Fluid Transportation" and GB/T3092 "Welded Steel Pipe for Low-Pressure Fluid Transportation" standard steel pipes are generally furnace welded steel pipes and sometimes made by resistance welding). In addition to the required inspection of steel pipes for fluid transportation, In addition to the project, only bending test requirements are attached, so the manufacturing and inspection requirements for this type of steel pipe are relatively low. Their specifications range from 1/8" to 6", with wall thicknesses ranging from ordinary grade to thickened grade. Material grades include Q195A, Q215, and Q235A. They are suitable for applications with design temperatures ranging from 0°C to 100C and design pressures ranging from 0°C to 100°C. Water and compressed air systems exceeding 0.6MPa.
