Method for comprehensively evaluating pipe manufacturing capacity of oil and gas conveying pipe factory

Abstract

A method for comprehensively evaluating the pipe manufacturing capacity of an oil and gas conveying pipe factory comprises the following steps that first, the fact whether the standards of all kinds of performance of an oil and gas conveying welding pipe has upper limit demands or not is used for determining corresponding computational formulas; second, test data are obtained according to the demands for group test frequency of the strength and the toughness of parent metal and welding joints, and through statistic analysis of original data, the average value and the standard deviation of the yield strength of the parent metal, the average value and the standard deviation of the tensile strength of the parent metal, the average value and the standard deviation of the impact power value of the parent metal, the average value and the standard deviation of the tensile strength of the welding joints, the average value and the standard deviation of the impact power value of the welding joints, and the average value and the standard deviation of the impact power value of the influencing area of the welding joints are obtained respectively and are substituted into the formulas. According to the method, process capability indexes are introduced to the pipe manufacturing industry to evaluate the pipe manufacturing level in a quantifying mode for the first time, the current product manufacturing condition of an enterprise can be judged, and the mutual balance of quality of economy is achieved.

Description

technical field [0001] The invention relates to the technical field of oil and gas pipeline quality detection, in particular to a method for comprehensively evaluating the pipe production capacity of an oil and gas transmission pipe factory. Background technique [0002] At present, when the owner invites bids for oil and gas transmission steel pipes, the technical bid part can only be graded based on the qualification level of the factory, sales performance, personnel and equipment and other hardware levels, and cannot actually distinguish the production technical capabilities of the pipe factory. In order to achieve a horizontal comparison of the pipe production level of the factory, a quantitative index is needed to measure the product quality control level of the pipe factory. [0003] There are many methods to evaluate product quality control level, such as 6σ management method, Pareto diagram method, histogram method, process capability index method, etc. Each method h...

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Problems solved by technology

[0005] At present, for pipe manufacturers with a high level of steel pipe quality control, for pipe-making contracts of more than 10,000 tons, even if the strength reaches X80 steel grade, the pipe-making pass rate of steel pipes can generally reach more than 99%, but even if it meets the standard The required steel pipes still have high and low quality, so it is difficult to judge the real pipe production level of each manufacturer

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