pipe grades and classification

- Jul 18, 2019-

pipe grades and classification

In a broad sense, pressure pipe refers to all pipes under internal or external pressure, regardless of the medium inside.The pressure pipe is a part of the pipe, which is used to transport, distribute, mix, separate, drain, measure, control and stop the flow of fluid.

The definition of the special equipment catalogue attached to the notice of aqsiq on revising the catalogue of special equipment (no. 114, 2014) issued by aqsiq on October 30, 2014 shall be changed to:Pressure pipeline, refers to the use of certain pressure, tubular device for conveying gases or liquids, the range for the maximum working pressure is greater than or equal to 0.1 MPa (table), medium for the gas, liquefied gas, steam or flammable, explosive, toxic, corrosive, the highest working temperature is higher than or equal to standard the boiling point of liquid, and nominal diameter greater than or equal to 50 mm.Except for non-toxic, non-combustible and non-corrosive gas pipelines and pipelines belonging to the equipment body, whose nominal diameter is less than 150mm and whose highest working pressure is less than 1.6mpa (gauge pressure).

1, the pressure pipeline is a system, mutual correlation and mutual influence, affect the whole body.

2, the pressure pipe length diameter ratio is very large, easy to instability, stress situation is more complex than the pressure vessel.The fluid flow state in the pressure pipeline is complex, with little buffer space, and the working condition variation frequency is higher than that of the pressure vessel (such as high temperature, high pressure, low temperature, low pressure, displacement deformation, wind, snow, earthquake, etc.).

3. There are various types of pipe components and pipe supports. Various materials have their own characteristics and specific technical requirements, and the selection of materials is complicated.

4. There may be more leaks in the pipe than in the pressure vessel, usually five in a single valve.

5, pressure pipe types, large number, design, manufacturing, installation, inspection, application management links, and pressure vessels are very different.



Cangzhou Steel Pipe Group (CSPG) Co., Ltd. is a large-sized, key metallurgic enterprise of Hebei Province in North China, whose history dates back to 1994. CSPG currently em/paces six member companies with products varying from SSAW, LSAW, ERW, seamless steel pipes to 3PE pipes, galvanized pipes, casing pipes, etc. A Joint-stock corporation, CSPG occupies an area of 600,000 square meters with a total asset of $530 million.

Specialized in the production of straight welded pipe spiral pipe galvanized pipe 3PE/3PP/FBE/TPEP internal and external epoxy powder internal and external epoxy resin cement mortar two cloth three oil buried pipeline IPN8710 non-toxic drinking water internal and external plastic coated lining plastic and other anti-corrosion pipe fittings for oil and gas pipeline water conservancy projects

Executive standard :DIN30670 DIN30678 CSA Z245 AFNOR nf49-710/711 NACE rp0394/0490 AWWAC 210/C213GB/T9711 API 5L ISO 3183Material: Q235B/Q355BGR A GR B x42-x80 l245-l555


Business scope: 21.3mm-3620mmLSAW submerged arc welded pipe 325-2020mmERW straight welded pipe 6mm-711mmSMLS seamless tube 10-1120mmSSAW spiral steel tube 219-3620mmDemand for quality suppliers and partners


High quality API 5CT Steel Seamless Oil Well Casing Pipe