Test device and method for evaluating anti-cracking sensitivity of pipeline steel in acid environment

Abstract

The invention discloses a test device and method for evaluating the anti-cracking sensitivity of pipeline steel in acid environment. The test device comprises an annular pipe section loading assembly,a pipe end sealing assembly and a nondestructive examination assembly, wherein the loading assembly comprises an outer loading assembly and an inner loading assembly; the pipe end sealing assembly comprises a sealing cover and a sealing ring arranged at the two ends of the annular test pipe section; a pipe hole and a sealing element of the pipe hole are arranged on each of the two sealing covers;the nondestructive examination assembly comprises an ultrasonic wave detection instrument and a hydrogen flux measuring instrument. The goal of evaluating the anti-cracking sensitivity of pipeline steel in acid environment on the basis of not damaging the pipe self inner stress and maintaining the original surface state can be realized; more quantized data than that of small-dimension sample evaluation can be obtained; the anti-cracking sensitivity of pipeline steel in acid environment can be more comprehensively and reliably evaluated. In addition, the evaluation on a pipe body, a pipe making welding seam and a butt joint welding seam can be simultaneously completed by one annular tested pipe section.

Description

Technical field [0001] The invention relates to a device and a method for evaluating the crack resistance sensitivity test of pipeline steel in an acid environment. Background technique [0002] With the continuous exploration and development of natural gas data, the proportion of sour gas fields has increased. The main natural gas production areas in my country are sour gas fields. For example, Sichuan-Chongqing gas fields, Turkmenistan gas fields and Kazakhstan gas fields are all sour gas fields. In an acidic environment, there is a risk of environmental cracking caused by H2S in pipeline steel made of carbon steel and low alloy steel, including HIC, SOHIC and SSC failure mechanisms, especially HIC and SSC. According to the existing standard system, when pipeline steel is intended to be used in an acidic environment, the manufacturing process should carry out SSC and HIC evaluation; for welded joints, SSC and HIC evaluation are also required in the welding process. At present,...

AI Technical Summary

Problems solved by technology

However, the difficulty of testing in acidic environment with annular pipe sections will be greatly increased, and the existing test methods and test devices will no longer be applicable. It is necessary to re-establish a set of test methods and test devices that can be operated safely

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