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This chapter provides a commentary on the ASME Boiler and Pressure Vessel Code, Section VIII, Division 3, 2010 Edition with the 2011 Addenda. It is intended to be used as a companion to Division 3 by Manufacturers and Users of high-pressure vessels, and will also provide guidance to Inspectors, materials suppliers, and others. The material is generally presented in the same order in which it appears in the Code. Comments are not given about each paragraph, but paragraph numbers are referenced as appropriate. The comments apply to the 2010 edition through the 2011 Addenda.
Division 3 was developed by the ASME Special Working Group (SWG) on High Pressure Vessels of Subcommittee VIII (currently the Subgroup on High Pressure Vessels of Standards Committee VIII). Standards Committee VIII is responsible for developing and maintaining all of the Boiler and Pressure Vessel Section VIII Codes, including Divisions 1, 2, and 3. Oversight of Standards Committee VIII is provided by the ASME Board on Pressure Technology Codes and Standards, which reviews all actions to ensure that the consensus process was followed.
The Code permits the use of either U.S. Customary or SI units at the User's option, but one system or the other should be used consistently for all phases of construction. However, the Code permits exceptions based on practical considerations. The objective is to permit flexibility in the use of units while ensuring that the calculations are clear. In the text of Division 3, the U.S. Customary unit is shown first, followed by the SI unit in parenthesis. This article follows that precedent in the text, but the figures have been presented only in SI units to avoid the clutter associated with dual units.