关键词: 压力管道, 工业管道, 定期检验, 压力试验, 设计使用年限, 超期服役

Abstract: TSG D7005-2018 Periodic Inspection Regulation for Industrial Pressure Piping has been formally implemented since May 1, 2018. Compared with the 2003 version of trial inspection regulation, this specification has obvious changes in inspection period, detection ratio, corrosion thinning rating, pressure test, safety accessory inspection and other aspects. This paper discusses the major content changes in this specification, and sorts out its relations with TSG D0001-2009 Pressure Pipe Safety Technology Supervision Regulation for Industrial Pressure Pipe and TSG 21-2016 Supervision Regulation on Safety Technology for Stationary Pressure Vessel. The revision reflects the systematicness and consistency of Chinese special equipment specification system. The current specification has no clear provisions for the pressure test of pipelines subjected to major repair or transformation or reused after deactivation. There are also no relevant provisions for the periodic inspection of pressure piping that reaches the designed service life. It is suggested that relevant studies should be carried out, and relevant specifications should be perfected to ensure the intrinsic safety of pressure piping. It is also suggested that Risk Based Inspection should be adopted for the periodic inspection of overtime serviced pressure piping, and targeted detection means should be adopted for piping with deterioration mechanism over time to effectively reduce operational risks

Key words: pressure piping, industrial piping, periodic inspection, pressure test, designed service life, overtime service