ASME B16.5-2009 pdf download

ASME B16.5-2009 pdf download.Pipe Flanges and Flanged Fittings.
1 SCOPE 1.1 General (a) This Standard covers pressure–temperature rat- ings, materials, dimensions, tolerances, marking, test- ing, and methods of designating openings for pipe flanges and flanged fittings. Included are (1) flanges with rating class designations 150, 300, 400, 600, 900, and 1500 in sizes NPS 1 ⁄ 2 through NPS 24 and flanges with rating class designation 2500 in sizes NPS 1 ⁄ 2 through NPS 12, with requirements given in both metric and U.S. Customary units with diameter of bolts and flange bolt holes expressed in inch units (2) flanged fittings with rating class designation 150 and 300 in sizes NPS 1 ⁄ 2 through NPS 24, withrequire- ments given in both metric and U.S. Customary units with diameter of bolts and flange bolt holes expressed in inch units (3) flanged fittings with rating class designation 400, 600, 900, and 1500 in sizes NPS 1 ⁄ 2 through NPS 24 and flanged fittings with rating class designation 2500 in sizes 1 ⁄ 2 through NPS 12 that are acknowledged in Nonmandatory Appendix E in which only U.S. Custom- ary units are provided (b) This Standard is limited to (1) flanges and flanged fittings made from cast or forged materials (2) blind flanges and certain reducing flanges made from cast, forged, or plate materials Also included in this Standard are requirements and recommendations regarding flange bolting, gaskets, and joints. 1.2 References Codes, standards, and specifications, containing pro- visions to the extent referenced herein, constitute requirements of this Standard. These reference docu- ments are listed in Mandatory Appendix III.
1.3 Time of Purchase, Manufacture, or Installation The pressure–temperature ratings in this Standard are applicable upon its publication to all flanges and flanged fittings within its scope, which otherwise meet its requirements. For unused flanges or flanged fittings maintained in inventory, the manufacturer of the flange 1 or flanged fittings may certify conformance to this Edi- tion, provided that it can be demonstrated that all requirements of this Edition have been met. Where such components were installed in accordance with the pres- sure–temperature ratings of an earlier edition of this Standard, those ratings are applicable except as may be governed by the applicable code or regulation.
1.4 User Accountability This Standard cites duties and responsibilities that are to be assumed by the flange or flanged fitting user in the areas of, for example, application, installation, system hydrostatic testing, operation, and material selection. 1.5 Quality Systems Requirements relating to the product manufacturer’s Quality System Program are described in Nonmanda- tory Appendix D. 1.6 Relevant Units This Standard states values in both metric and U.S. Customary units. As an exception, diameter of bolts and flange bolt holes are expressed in inch units only. These systems of units are to be regarded separately as stan- dard. Within the text, the U.S. Customary units are shown in parentheses or in separate tables. The values stated in each system are not exact equivalents; there- fore, it is required that each system of units be used independently of the other. Except for diameter of bolts and flange bolt holes, combining values from the two systems constitutes nonconformance with the Standard.
1.7 Selection of Materials Criteria for selection of materials suitable for particu- lar fluid service are notwithin the scope ofthis Standard. 1.8 Convention For the purpose of determining conformance with this Standard, the convention for fixing significant digits where limits, maximum and minimum values, are specified shall be rounded as defined in ASTM Practice E 29. This requires that an observed or calculated value shall be rounded off to the nearest unit in the last right-hand digit used for expressing the limit. Decimal values and tolerances do not imply a particular method of measurement.
2.4 Rating Temperature The temperature shown for a corresponding pressure rating is the temperature ofthe pressure-containing shell of the component. In general, this temperature is the same as that of the contained fluid. Use of a pressure rating corresponding to a temperature other than that of the contained fluid is the responsibility of the user, subject to the requirements ofapplicable codes and regu- lations. For any temperature below −29°C (−20°F), the rating shall be no greater than the rating shown for −29°C (−20°F) (see also paras. 2.5.3 and 5.1.2). 2.5 Temperature Considerations 2.5.1 General. Use of flanged joints at either high or low temperatures shall take into consideration the risk of joint leakage due to forces and moments devel- oped in the connected piping or equipment. Provisions in paras. 2.5.2 and 2.5.3 are included as advisory with the aim of lessening these risks.