Identification of pipe steels of domestic and foreign manufacturing

UDK: 622.692.4-034.14
DOI: 10.24887/0028-2448-2018-2-90-95
Key words: identification, pipe steel, mechanical properties, chemical composition, long-term operation, steel grade
Authors: Yu.V. Lisin (The Pipeline Transport Institute LLC, RF, Moscow), N.A. Mahutov (The Pipeline Transport Institute LLC, RF, Moscow), D.A. Neganov (The Pipeline Transport Institute LLC, RF, Moscow), E.P. Studenov (The Pipeline Transport Institute LLC, RF, Moscow), S.V. Skorodumov (The Pipeline Transport Institute LLC, RF, Moscow)

Questions of complex assessment of durability are considered of long-operated systems of transport of oil and oil products. These questions are coordinated to standard justification of conditions and characteristics of durability pipe steel, pipes and pipeline systems. At such justification one and most important aspects of assessment of durability are an identification pipe steel on the whole set of the defining factors of production and operation. A set of technology factors include: the manufacturer (domestic or foreign), parameters of the chemical composition, mechanical properties of steel in an initial state after production of pipes, the working pressure, term of operation of pipes, geometrical parameters of pipes (diameters, thickness of walls), a microstructure and granularity of steel, anisotropy of properties. The complexity of assessment of a role of the specified factors often is connected with lack of initial technological, technical, settlement and design information, especially for the pipelines which are in operation of 30-50 years and more. In this case identification is carried out by results of indirect tests with assessment of calculated parameters of durability. Control inspections of durability are carried out direct laboratory researches of the standard samples which are cut out from pipes, bench tests of fragments of pipes before destruction, by hydraulic tests at each stage of operation. In the conclusion bases of a technique of identification pipe steel, developed by Pipeline Technology Institute are stated.


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