NDLI: Background on the New ASME PCC-1-2010 Appendices D and O “Guidelines for Allowable Gasket Contact Surface Flatness and Defect Depth” and “Assembly Bolt Load Selection”

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Brown, Warren
Copyright Year	2010
Abstract	ASME PCC-1 “Guidelines for Pressure Boundary Bolted Joint Assembly” has recently been published and includes several new or extensively revised appendices. Among those is a new Appendix D “Guidelines for Allowable Gasket Contact Surface Flatness and Defect Depth”, which outlines a more practical approach, based on the gasket type being used, to determining acceptable surface flatness and defect tolerances. The approach is based on basic gasket elastic compressibility properties and follows a methodology similar to vessel flaw evaluation to provide guidance for the acceptable depth and size of flange seating surface defects. It will enable independent assessment of the acceptability of defects on a flange facing by inspection personnel without the need for experienced-based judgment for each individual defect by others. An additional new appendix is Appendix O “Assembly Bolt Stress Determination”. In this appendix an alternative, more advanced method compared to the previous method employed in PCC-1 is outlined for the determination of the optimal assembly bolt stress for any bolted joint. The method is based on the maintenance of an acceptable level of gasket stress, with consideration of operating loads or effects acting on the joint. Sufficient data is contained within the appendix to enable the creation of site-specific target assembly bolt torque charts for all standard size flanges. In addition the method can be applied to non-standard joints for a site-wide approach to determining target assembly bolt stress levels on a systematic basis. This paper outlines the background into the development of both of these new appendices and includes further examples of the use of Appendix O.
Sponsorship	Pressure Vessels and Piping Division
Starting Page	89
Ending Page	93
Page Count	5
File Format	PDF
ISBN	9780791849224
DOI	10.1115/PVP2010-25766
e-ISBN	9780791838785
Volume Number	ASME 2010 Pressure Vessels and Piping Conference: Volume 3
Conference Proceedings	ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference
Language	English
Publisher Date	2010-07-18
Publisher Place	Bellevue, Washington, USA
Access Restriction	Subscribed
Subject Keyword	Torque Compressibility Gaskets Vessels Flanges Bolted joints Inspection Manufacturing Maintenance Pressure Stress
Content Type	Text
Resource Type	Article

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