![]() As the new pressure ratings are slightly higher the flange thicknesses have slightly increased. AS4087 is an update of AS2129, however AS2129 is still widely used so it has not been deleted as a standard, however, it now only covers AS table D to H.ĪS4087 is the latest standard for BS table D to H, the same drilling is used but the new PN pressure rating system has been adopted. In some cases slightly larger bolt holes provide better clearance as metric bolts are specified in lieu of UNC bolts used by BS10. Australian StandardĪS2129 originates from BS10 and has been metricated. PN ratings do not provide a proportional relationship between different PN numbers, whereas class numbers do. PN is the rating designator followed by a designation number indicating the approximate pressure rating in bars. Piping Class Ratings based on ASME B16.5 and corresponding PN rating: – Flange Class Note in the case of AS4331.1/ISO 7005-1 ANSI equivalents they are not absolutely identical to ANSI but “deemed to comply and are designed to be interchangeable”. However, piping engineers must refer to the new AS standard AS4331 for interpretations and specification requirements. ![]() Consequently in Australia most users simply just reference to original ASME B16.5 standards as this is already in use in Australia for the Oil, Gas and Mining industries and in fact in pressures above table E it has been the predominant standard in use for the last 30 years. These flanges are the same as EN1092 but EN1092 also includes higher rated DIN based flanges. ISO 7005 (which AS4331 is a reproduction of) also includes European DIN flanges PN6/10/16/25/40 which were previously DIN 2501-1 and BS4504. AS4331 is a reproduction of ISO 7005 which is based on the American and European flange systems PN20, PN50, PN 110, PN 150, PN 260 and PN 420 steel flanges are “designed to be interchangeable” with flanges to American standards ANSI/ASME B16.5 and MSS SP44 they are not identical but are “deemed to comply” with dimensions specified in ANSI/ASME B16.5 and MSS SP44 as appropriate. The latest Australian standard AS4331 references this rating system (PN2.5 to PN420). the cold working pressure of PN10 is 10 bar. PN stands for Nominal Pressure and roughly equates to the number of bar i.e. ![]() EN 1092-1 is for steel flanges, EN 1092-2 is for iron flanges, EN 1092-3 is for alloy flanges, EN 1092-4 is for aluminium alloy flanges. (BS4504 flanges were generally the same as the old DIN 2501 specification, but the new EN 1092 standard covers a wider range). EN 1092 evolved from DIN 2501 which became part of ISO 7005, then EN 1092 was created as the standard for DIN based flanges. BS4504 is now obsolete and is replaced by EN 1092 which is listed in British Standards as BS-EN 1092. Increasingly European PN rated flanges are also specified in BS4504 as well as AS4331 and EN 1092-1. However in general industrial, commercial and waste/water industries AS2129 Table flanging is the most common. The most common flanging used in Australia in oil, gas and mining is now ANSI flanging to ANSI B16.5. Metric to Imperial ASME Pipe & Valve Size Conversion Chart
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