Seamless Line Pipe

Seamless Line steel pipe refers to use seamless steel pipe production technology to produce. Pipeline steel tube is put out oil, steam, water, pipeline through the pipeline to oil and gas industry enterprise. Line pipe including seamless pipe and welded steel pipe, the pipe end with flat end, with threaded end and socket end; Its connection way as the end of welding, coupling connection, socket connection, etc.

High grade pipeline steel tube heat treatment process

With the development of the pipeline steel plate technology and the progress of welded pipe forming, welding technology, the application range of the pipe with welded pipe in gradually expanding, especially in the large diameter welded pipe class scope the advantage of more wet, and cost factors, welded pipe has been dominant in the field of line pipe, which limits the development of stainless steel seamless steel line pipe. About 2004 t 2004 seamless line pipe production, steel grade including X42-70, varieties have a seabed pipeline onshore pipeline steel pipe and carbon steel pipe.

Of high grade pipeline steel production is currently a micro alloying heat treatment process, the production cost of stainless steel seamless tube was obviously higher than that of welded pipe, and with the improvement of steel grade, such as the above X80 grade pipeline steel pipe for the limitation of carbon equivalent, seamless steel tube of conventional technology is difficult to meet user requirements; Now every 12 cr1mov alloy pipe factory in for the improvement of line pipe corrosion resistance, the use of stable performance and low temperature, high temperature environment to carry out the scientific research work.

Mild steel pipe weight calculation formula: [] - wall thickness (diameter) * wall thickness * = 0.02466 kg/m (weight of per meter)

At present in our country, the use of oil and gas transmission pipe of the main technical standards are API SPEC 5 l, GB/T 9711, DNV OS - F101, often involves the standard and ISO 3183, CSAZ662, roughly as follows:

(1) the API 5 l line pipe specification is beautiful because of the development of the petroleum institute a widely adopted standard. Specification only for steel pipe products, not including design, selection and installation of pipelines. Traditionally API 5 l is reasonable, the technical requirements for both the technical requirements of pipeline steel and factory's actual production possibilities, but the relative of pipeline and pipe technology development, the technical requirements of API 5 l appear to be loose, has rarely alone is suitable for the pipeline to the requirement of structural steel pipe.

(2) the DNV OS - F101 seabed pipeline (system) is a det norske veritas formulating specifications for subsea pipeline. Involves the content is very extensive, including pipeline design, material, manufacture, installation, testing, operation, maintenance and other aspects. Alone on the technical requirements for steel pipe are usually more strict than API 5 l.

(3) the ISO 3183 - l (- 2, 3) - (oil and gas industry conveying pipe delivery technical conditions in the first part: grade A steel pipe/second part; B steel pipe/third part; grade C steel) is established by the international organization for standardization about the standard of oil and gas transmission pipe delivery condition, according to the different service conditions of steel tube, divided into A, B, C three levels. The standard is not involved in pipeline design and installation, etc. Develop more comprehensive and detailed technical terms.

(4) GB/T 9711.1 (2) is China committee for standardization of tubing just standard committee equivalent adopting IS03183 "l (- 2) standard set by the oil delivery pipe used in industry technical conditions of delivery. API SPEC 5 l line pipe specification and the ISO 3183 (conveying pipe technical conditions of delivery) is the international has a great influence on the line pipe specification, in contrast, most of the world's oil companies are used to using the API SPEC 5 l specification as the basis of pipeline steel pipe procurement specification. Domestic according to the requirements of API SPEC 5 l standards and engineering design production pipeline steel is only 20 years of history. But the API SPEC 5 l is a common standard, geography, climate and other natural conditions vary widely from all over the world, the nature of the medium is different, therefore, many oil companies to call for the nature of the API are also different, therefore, many oil companies will API SPEC 5 l as a basic standard, on the basis of the standard, according to the requirements to the local actual situation or pipeline, formulate quality technical supplementary specification (technical conditions). West-east gas pipeline "technical conditions" of steel tube with API SPEC 5 l line pipe specification, as the foundation, combined with the specific situation of the west-east gas pipeline to develop.