Specifications for the inspection of pressure pipelines
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Dear sea friends: Hello everyone! To better account for hydrogen losses, it is planned to install a flow meter on the hydrogen delivery pipeline. Given the regulatory oversight of pressure pipelines by the Market Regulation Bureau, what procedures must be followed for making changes to the process pipelines? I’d like to ask some friends who know about this area; thank you! The company has an internal system for changes to process equipment; is it still necessary for the process design institute to prepare new drawings?
The existence of an internal system for changing process equipment in a company does not equate to the qualifications required for the inspection and maintenance of pressure pipelines
Adding flow meters to the hydrogen pipeline changes the structural layout of the pipeline, which constitutes a modification to a pressure pipeline. If the total length of pipes with the same medium to be replaced in one go during the renovation is 100 meters or less, no supervision or inspection is required for the renovation. As part of the company’s internal safety and quality management, the design institute should prepare the modification drawings, and qualified installation units shall carry out the modifications. The company must keep proper records for use as reference by inspection agencies during regular inspections of pressure pipelines.
Thank you for the reply. I would like to ask further: are there any relevant standards and specifications for modifying pressure pipelines?
For the supervision and inspection of modified pressure pipelines, refer to TSG D7006-2020 \"Rules for Supervision and Inspection of Pressure Pipelines\".
Option 1: Dig a hole and install a thermal flow meter; no approval from the special inspection agency is required. The design institute needs to prepare revised drawings. Option 2: Cut, attach two flanges, install a mass flow meter; changes will be made to the drawings.
You need to ask the local special inspection agency; regulatory requirements vary from place to place