What is a pipe pipe

1. Classification of pipelines
Pipeline pipe is the abbreviation of the steel pipe used in the oil and gas industry to transport oil, refined oil, natural gas, water and other pipelines. Oil and gas transmission pipelines are mainly divided into three types: trunk pipeline, branch pipeline and urban pipe network pipeline. Using 406 ~ 1219 mm channel, the wall thickness is 10 ~ 25 mm, and x ~ X80 steel. Branch pipeline and urban pipe network pipeline general specification for the | 114 ~ 700 mm, thickness is 6 ~ 20 mm, the grade of steel is X42 ~ X80.
Pipes Pipes include welded steel pipes and seamless steel pipes, and welded steel pipes are used more than seamless steel pipes.
2. Pipeline standard
The implementation standard of pipeline is API 5L "Specification for Pipe Steel Pipe", However, China issued two national standards for pipeline piping in 1997 :GB/T9711.1-1997 Oil and Gas Industry - Steel tubes for Power transmission - Part I: Class A and GB/T9711.2-1997 Oil and Gas Industry - Steel tubes for power transmission - Part 2: Class B steel tubes. These two standards are equivalent to the standards set by API 5L, and many domestic users require supply in accordance with these two national standards.
3. About PSL1 and PSL2
PSL stands for Product Specification Grade. The product specification grade of pipeline is divided into PSL1 and PSL2, and the quality grade is also divided into PSL1 and PSL2. PSL1 is higher than PSL2, and the two specification grades not only have different inspection requirements, but also different chemical composition and mechanical properties requirements. Therefore, when ordering under API 5L, in addition to the usual indicators such as specification and steel grade, the product specification class, i.e. PSL1 or PSL2, must be stated in the contract terms.
PSL2 is more strict than PSL1 in chemical composition, tensile property, impact energy, nondestructive testing and other indicators.
4. Grade and chemical composition of pipeline steel
The steel types of pipe are divided into A25, A, B, X42, X46, X52, X60, X65, X70 and X80 from low to high.
5. Water pressure and non-destructive requirements of pipelines
Water pressure test shall be carried out one by one on pipelines, and the standard does not stipulate that the use of non-destructive water pressure is allowed, which is also a big difference between API standard and Chinese standard.
PSL1 does not require nondestructive testing, while PSL2 requires nondestructive testing one by one.