Commonly used pipe fittings specifications size 20, 25, 40 and so on. Commonly used pipe fittings are still relatively rich in variety, its use is also relatively good, when you buy the eye to see what they need to model, do not buy the wrong one.
1, the usual length (also known as non-size length): Where the length of the standard length range and no fixed length requirements, are called the usual length. For example, the structural pipe standards: hot-rolled (extrusion, expansion) steel pipe 3000mm ~ 12000mm; cold-drawn (rolled) steel pipe 2000mmm ~ 10500mm.
2, sizing length: sizing length should be in the range of the usual length, is a fixed length of the contract requirements of the size. But the actual operation are cut out of the fixed length is unlikely, so the standard for the fixed length of the permissible positive deviation value.
The classification of steel pipe
1, what is the classification of steel pipe, pipeline pipe. Such as: water, gas pipe, steam pipeline with seamless pipe, oil transportation pipe, oil line pipe. Agricultural irrigation faucet with pipe and sprinkler irrigation pipe, etc..
2, what is the classification of steel pipe, thermal equipment pipe. Such as general boiler with boiling water pipe, superheated steam pipe, locomotive boiler with superheated pipe, large smoke pipe, small smoke pipe, arching brick pipe, and high temperature and high pressure boiler tube.
3, mechanical industry pipe. Such as aviation structural tube (round tube, oval tube, flat oval tube), automobile half-axle tube, axle tube, automobile tractor structural tube, tractor oil cooler tube, square and rectangular tubes for agricultural machinery, transformer tubes, as well as bearing tubes and so on.
4, what is the classification of steel pipe, oil geological drilling pipe. Such as: oil drilling pipe, oil drill pipe (square drill pipe and hexagonal drill pipe), drill jerks, oil pipe, oil casing and various pipe joints, geological drilling pipe (core pipe, casing, active drill pipe, drill jerks, by the hoop and pin joints, etc.).
5, chemical industry pipe. Such as: oil cracking pipe, chemical equipment heat exchanger and piping pipe, stainless steel acid pipe, fertilizer high-pressure pipe and pipe for transporting chemical media.
6, other sectors of the pipe. Such as: container tubes (high-pressure cylinder tubes and general container tubes), instrumentation tubes, watch case tubes, injection needles and their medical equipment tubes.