Where is the official definition of the pipeline to which the equipment itself belongs?

Article 1.6.1 of TSG21-2016

This post was last edited by niat8888 on 2022-12-15 08:04. Hello! We are a company based in Zibo, Shandong, specializing in the production of vacuum pumps, compressors, and complete sets of units (systems). Our compressor units are designed in accordance with the API681 standard; they consist mainly of purchased components such as welded chassis (supports), motors, separators, heat exchangers, and couplings. The compressors themselves have their key parts manufactured internally and the units are assembled there as well. The piping systems, including suction and discharge pipes as well as water supply pipes, are welded by us using flanges, pipe fittings, valves, elbows, tees, etc. Finally, all these components and piping systems are assembled into complete units within the factory. According to the definition in Document No. 33 issued by the Quality, Technology and Supervision Office: 2. The pipes belonging to the equipment itself refer to those pipes that are designed in accordance with the same design specifications as the equipment, and that are connected to the equipment body at the time of its manufacture. We would like to ask: Since our unit meets the above definition, do these internal pipes constitute part of the equipment’s own piping? If it belongs to the pipes of the equipment itself, is it within the scope of regulation for pressure pipes? · ·Special Equipment Safety Supervision Bureau: Please determine whether it falls under pressure pipelines in accordance with the Catalogue of Special Equipment ； If the said pipeline belongs to the pipelines of the equipment itself, it is not included in the management of pressure pipelines. Skid-mounted pressure-bearing equipment systems that include pressure vessel and pressure pipeline components shall also meet the requirements of Special Quality Inspection Letter [2016] No. 46. Dear leaders of the General Administration, hello. When our company purchased the lifting block equipment, there was a disagreement regarding the definition of the pipes inside the lifting blocks. Our company considers it to be a pressure pipeline (as defined in the catalog of special equipment), but the manufacturer regards it as a pipeline that is part of the equipment itself. In accordance with Document No. 33 issued by the Quality, Technology and Supervision Office, the pipes associated with the equipment itself refer to those pipes that are designed in accordance with the same design specifications as the equipment itself, and are connected to the equipment body during its manufacturing process. The boundary between the pipes belonging to the pressure vessel itself and the pressure pipelines refers to the first circumferential weld at which the pipe fitting of the pressure vessel is welded to the external pipeline ； The first threaded joint in a threaded connection ； First flange sealing surface of the flanged connection (vessel side) ； Special connector, the first seal for pipe fitting connections. Could the leaders of the General Administration provide corresponding standards that can clearly define the scope? Thank you. Pipe » DN50, hydrogen, ethane, 0.3MPA. Special Equipment Safety Supervision Bureau: The scope of the equipment itself shall be determined in accordance with relevant standards and specifications. Clause 1.6 of TSG 21-2016 specifies the scope of the fixed pressure vessel body. Clause 1.5 of TSG R0005-2011 specifies the scope of mobile pressure vessels.

Don’t try to understand the pipes associated with the equipment itself; it will only cause confusion. Just refer to the drawings – the drawings of pressure vessels include information regarding such pipes, and those are considered part of the pressure vessel, while those that are not included belong to pressure pipelines.