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WRC BUL 435

1998 Edition, September 1, 1998

Complete Document

EVALUATION OF DESIGN MARGINS FOR SECTION VIII, DIV. 1 AND 2 OF THE ASME BOILER AND PRESSURE VESSEL CODE



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Product Details:

  • Revision: 1998 Edition, September 1, 1998
  • Published Date: September 1998
  • Status: Active, Most Current
  • Document Language: English
  • Published By: Welding Research Council (WRC)
  • Page Count: 85
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

This Bulletin contains two reports, which provide information regarding the design margin on ultimate stress used in Section VIII, Division 1 and Division 2 of the ASME Boiler and Pressure Vessel Code. The first report specifically deals with the background and technical justification involved with changing the design margin in Division 1 from 4.0 to 3.5. This report provides the basis for reducing the margin to 3.5 and recommendations to ASME for implementing the reduction for Division 1, which has occurred through two ASME Code Cases and then in Division 1, itself, as of July 1, 1999. Section I of the Code also used information in this report to supplement its justification for changing its design margin from 4.0 to 3.5. The first report discusses the effects of the change on the overall construction requirements in Division 1 regarding the many improvements to it since the design margin of 4.0 was instituted in the 1950s The second report deals with the considerations necessary to reduce design margins even lower than 3.5 in Division 1 and lower than 3.0 in Division 2. . Discussions in both reports include review of burst tests, failure data, failure modes—particularly fatigue and fracture and related toughness requirements, fabrication practices, improved materials, advances in welding, examination and testing and comparison with other international codes and other important aspects. Results from the second report have been used to develop proposals to restructure Division 2 to include multiple levels of design margins in stages from 3.0 to as low as 1.8, with attendant changes in design and construction requirements. Publication of this document – WRC Bulletin 435 was sponsored by the Pressure Vessel Research Council of the Welding Research Council.