1. Classification by production method:
(1) Seamless tubes - cold drawn tubes, extruded tubes, cold rolled tubes.
(2) Welded pipe:
(a) Classification by process - gas shielded welded pipe, arc welded pipe, resistance welded pipe (high frequency, low frequency).
(b) According to welding seam - straight seam welded pipe, spiral welded pipe.
2. Classification by wall thickness - thin-walled steel pipes, thick-walled steel pipes
3. Classification by material:
(1) 304 stainless steel water pipe
(2) 304L stainless steel water pipe
(3) 316 stainless steel water pipe
(4) 316L stainless steel water pipe
Connection method
1. Clamping type connection ---------It is divided into single clamping and double clamping. Double clamping is the most stable connection method. Use radial shrinkage external force (hydraulic clamp) to clamp the pipe fittings on the pipe, and achieve the connection effect through the water stop of the O-ring. Easy to operate, good sealing, and cannot be disassembled.
2. Expanded ring connection---------Use radial contraction external force (hydraulic clamp) to clamp the pipe fittings on the pipe, and achieve the connection effect through the water stop of the wide-band rubber sealing ring. The pipe is detachable. The installation process adds a rolling convex ring at the pipe end; the sealing performance is average and the cost of cast pipe fittings is high.
3. Welding connection---------Using hot melt process to weld the two connecting parts to achieve the connection effect. The connection strength is high, and the weld gas protection of the on-site welding joint is difficult to meet the standard, causing the weld to rust easily, directly reducing the service life of the pipeline; the installation quality is highly dependent on the welder's skills, and the quality is difficult to stabilize.
4. Self-locking connection - first used for small-diameter plastic hose connections, no tools required, quick installation. The inside of the interface is easy to loosen and leak, and the sealing performance is poor.
