First periodic inspection of GC2 pressure pipeline
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I have a question: for the first regular inspection of pressure pipelines, is it still necessary to have a testing company conduct radiographic testing on site? Non-destructive testing and radiography were carried out on the pressure pipeline during installation. After the testing company issues the report, one is asked to take it to the designated testing room at the special inspection facility, where they will schedule an on-site thickness measurement; only then can a regular inspection report be issued. The pipeline of GC2. :(
Here, the first regular inspection of pressure pipelines generally takes place in the 3rd year after the installation and commissioning of such pipelines (which are already registered) – based on the date indicated in the inspection report at the time of completion of installation. The special inspection agency will conduct macroscopic inspections, thickness measurements, non-destructive testing, and other procedures on-site.
Whether to conduct testing should be determined based on the usage time
Pipelines of grade GC1 and GC2 are generally subject to their first comprehensive inspection within 3 years of operation, while pipelines of grade GC3 are generally subject to their first comprehensive inspection within 6 years of operation. The subsequent inspection intervals shall be determined by the inspection agency based on the safety status level of the pipeline, in accordance with the following requirements: (1) For pipelines with a safety status level of 1 or 2, as well as GC1 and GC2 grade pipelines, inspections are generally carried out every 6 years; for GC3 grade pipelines, inspections are conducted no more often than once every 9 years ； (II) The safety status level is 3, and inspections are generally conducted every 3 years ； (III) If the safety status level is 4, the defects must be addressed; if, after addressing these defects and conducting inspections, the device still does not meet the safety performance requirements, it shall not be used any further.
Chapter 6 of TSG D0001-2009 explains it very clearly