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Free PDF Download of ASME B16.5-2020: The Updated Pipe Flanges and Flanged Fittings Standard with SI and U.S. Customary Units


ASME B16.5 PDF 2020 Free Download: Everything You Need to Know




If you are looking for a reliable and comprehensive source of information on pipe flanges and flanged fittings, you might want to check out the ASME B16.5 PDF 2020 free download. This is the latest edition of the American Society of Mechanical Engineers (ASME) standard that covers pressure-temperature ratings, materials, dimensions, tolerances, marking, testing, and methods of designating openings for pipe flanges and flanged fittings.


In this article, we will explain what is ASME B16.5, why you need it, and how to get it for free. We will also answer some frequently asked questions about this standard.




asme b16 5 pdf 2020 free download



What is ASME B16.5?




ASME B16.5 is a standard that was developed by the ASME B16 Committee on Standardization of Valves, Flanges, Fittings, and Gaskets. It was first published in 1922 as a tentative standard for steel pipe flanges and flanged fittings, and has since been revised several times to incorporate new materials, dimensions, pressure classes, and other changes.


The purpose of ASME B16.5 is to provide a common basis for the design, manufacture, testing, inspection, installation, and maintenance of pipe flanges and flanged fittings for various applications in piping systems.


Scope and application of ASME B16.5




ASME B16.5 applies to pipe flanges and flanged fittings with rating class designations from 150 to 2500 in sizes from NPS 1/2 through NPS 24 (DN 15 through DN 600). It also applies to blind flanges and certain reducing flanges made from cast, forged, or plate materials.


ASME B16.5 does not apply to flanges and flanged fittings made from materials other than those listed in the standard, or to special types of flanges such as orifice flanges, long welding neck flanges, expanding flanges, or spectacle blinds.


ASME B16.5 is intended to be used in conjunction with other ASME standards and codes, such as the Boiler and Pressure Vessel Code (BPVC) and the B31 Piping Codes.


Types and dimensions of flanges and flanged fittings in ASME B16.5




ASME B16.5 provides dimensions, tolerances, bolt sizes, bolt hole patterns, gasket dimensions, facing types, and other details for six types of flanges:



  • Weld neck flanges



  • Slip-on flanges



  • Socket weld flanges



  • Lap joint flanges



  • Threaded flanges



  • Blind flanges



The standard also provides dimensions for four types of flanged fittings:


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Welding neck


  • Long radius elbows



  • 3D elbows



  • Reducing outlet tees



  • Caps



The standard also provides tables for the dimensions of flanges and flanged fittings for each rating class and size, as well as the dimensions of ring joint flanges and ring joint gaskets.


Pressure-temperature ratings and materials of ASME B16.5 flanges and flanged fittings




ASME B16.5 provides pressure-temperature ratings for each rating class and material group of flanges and flanged fittings. The pressure-temperature ratings are based on the allowable stress values and temperature limits of the materials, as well as the design factors and coefficients of the flanges and flanged fittings.


The standard also provides tables for the material specifications, chemical compositions, mechanical properties, and heat treatment requirements of the materials used for flanges and flanged fittings. The materials include carbon steel, alloy steel, stainless steel, nickel alloy, titanium alloy, zirconium alloy, aluminum alloy, copper alloy, and cast iron.


Marking, testing, and designating openings of ASME B16.5 flanges and flanged fittings




ASME B16.5 provides requirements for the marking, testing, and designating openings of flanges and flanged fittings. The marking includes the manufacturer's name or trademark, the material designation, the rating class, the size, the facing type, the heat number, and any other information required by the applicable code or specification.


The testing includes the hydrostatic test or the nondestructive examination (NDE) of the flanges and flanged fittings to ensure their quality and integrity. The standard also provides methods for conducting the hydrostatic test or the NDE.


The designating openings include the nominal pipe size (NPS), the outside diameter (OD), the bore diameter (B), and the wall thickness (t) of the pipe or tube that is connected to the flange or flanged fitting. The standard also provides formulas for calculating these dimensions.


Why do you need ASME B16.5 PDF 2020?




If you are involved in the design, manufacture, installation, or maintenance of piping systems that use pipe flanges and flanged fittings, you need ASME B16.5 PDF 2020 to ensure that you are following the best practices and standards in the industry. ASME B16.5 PDF 2020 can help you to:


Benefits of using ASME B16.5 PDF 2020





  • Ensure the safety and reliability of your piping systems by using flanges and flanged fittings that can withstand the pressure and temperature conditions of your applications.



  • Reduce the risk of leakage, corrosion, erosion, fatigue, or failure of your piping systems by using flanges and flanged fittings that are compatible with your piping materials and fluids.



  • Optimize the performance and efficiency of your piping systems by using flanges and flanged fittings that have proper dimensions, tolerances, bolt sizes, gasket types, facing types, and other details.



  • Simplify the installation and maintenance of your piping systems by using flanges and flanged fittings that have standardized marking, testing, and designating openings.



  • Comply with the regulatory requirements and codes that apply to your piping systems by using flanges and flanged fittings that conform to ASME B16.5.



Updates and changes in ASME B16.5 PDF 2020




ASME B16.5 PDF 2020 is the latest edition of the standard that was published in November 2020. It supersedes ASME B16.5-2017 and incorporates several updates and changes from the previous edition. Some of these updates and changes are:



  • The addition of new pressure classes 4000# through 20000# for sizes NPS 1/2 through NPS 4 (DN 15 through DN 100).



  • The addition of new material groups 2.9 through 2.11 for high-strength low-alloy steels.



  • The revision of pressure-temperature ratings for some material groups to reflect updated allowable stress values.



  • The revision of dimensions for some types of flanges and flanged fittings to reflect updated tolerances.



  • The revision of marking requirements for some types of flanges and flanged fittings to reflect updated specifications.



  • The revision of testing requirements for some types of flanges and flanged fittings to reflect updated methods.



How to use ASME B16.5 PDF 2020 with other ASME standards and codes




ASME B16.5 PDF 2020 is not a standalone standard, but rather a part of a larger system of ASME standards and codes that cover various aspects of piping systems. Therefore, when using ASME B16.5 PDF 2020, you should also refer to other relevant ASME standards and codes, such as:



ASME BPVC Section II - Materials: This section provides the material specifications, properties, and allowable stress values for the materials used in ASME B16.5 flanges and flang


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