T/CASEI 011-2022 The regular inspection specifications for fixed pressure vessels in a wet hydrogen sulfide corrosion environment

Scope

Scope: This document specifies the basic requirements, inspection items and methods, and safety condition grade evaluation for regular inspections of fixed pressure vessels (hereinafter referred to as pressure vessels) made of carbon steel and low-alloy steel in wet hydrogen sulfide corrosive environments; Main technical content: A set of inspection, detection and evaluation methods for hydrogen-induced macroscopic damage to pressure vessel bodies in wet hydrogen sulfide environments has been established. By analyzing failure cases, studying mechanisms, and validating through on-site inspections, screening conditions prone to wet hydrogen sulfide damage have been identified; a detection technology route combining wall-climbing electromagnetic ultrasonic and ultrasonic guided wave methods has been adopted to achieve rapid detection of wet hydrogen sulfide damage; based on the phased array spectral characteristics of hydrogen bubbles, hydrogen-induced cracking, and layered defects, accurate diagnosis of wet hydrogen sulfide damage has been achieved; electromagnetic ultrasonic technology has been used for in-service monitoring of pressure vessels with wet hydrogen sulfide damage; fitness-for-service evaluations have been conducted for pressure vessels with hydrogen bubbles defects; and repair methods for wet hydrogen sulfide damage have been standardized to ensure the long-term safe operation of pressure vessels in wet hydrogen sulfide environments.

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