ASME B16.5:2003 pdf download Pipe Flanges and Flanged Fittings NPS 1 /2 Through NPS 24 Metric/Inch Standard
SCOPE1
1.1 General
(a) This Standard covers pressure-temperature rat-ings,materials,dimensions, tolerances, marking，testing, and methods of designating openings for pipeflanges and flanged fittings. Included are
(1) flanges with rating class designations 150, 300400，600,900，1500,and 2500 in sizes NPS % throughNPS 24, with requirements given in both metric and U.SCustomary units with diameter of bolts and flange boltholes expressed in inch units
(2) flanged fittings with rating class designation150 and 300 in sizes NPS through NPS 24, with requirements given in both metric and US. Customary unitswith diameter of bolts and flange bolt holes expressedin inch units
(3) flanged fittings with rating class designation400,600,900,1500, and 2500 in sizes NPS throughNPS 24 that are acknowledged in Annex G in whichonly U.S. Customary units are provided(b) This Standard is limited to
(1) flanges and flanged fittings made from cast orforged materials
(2) blind flanges and certain reducing flanges madefrom cast, forged, or plate materials
Also included in this Standard are requirements andrecommendations regarding flange bolting, flange gaskets, and flange joints.
1.2 References
Codes, standards,and specifications, containing provisions to the extent referenced herein, constituterequirements of this Standard. These reference documents are listed in Annex H.
1.3 Time of Purchase, Manufacture, or Installation
The pressure-temperature ratings in this Standard areapplicableupon its publication to all flanges and flangedfittings within its scope which otherwise meet itsrequirements, For unused flanges or flanged fittingsmaintained in inventory, the manufacturer of the flangeor flanged fittings may certify conformance to this Edi.tion provided that it can be demonstrated that allrequirements of this Edition have been met, Where such components were installed in accordance with the pressure-temperature ratings of an earlier edition of thisStandard, those ratings are applicable except as may begoverned by the applicable code or regulation.
1.4 User Accountability
This Standard cites duties and responsibilities that areto be assumed by the flange or flanged fitting user in theareas of, for example, application, installation, systemhydrostatic testing, operation, and material selection.
1.5 Quality Systems
Requirements relating to the product manufacturer’sQuality System Program are described in Annex E.
1.6 Relevant Units
This Standard states values in both metric and USCustomary units As an exception, diameter of bolts andflange bolt holes are expressed in inch units only. Thesesystems of units are to be regarded separately as stan-dard. Within the text, the US. Customary units areshown in parentheses or in separate tables. The valuesstated in each system are not exact equivalents; therefore, it is required that each system of units be usecindependently of the other. Except for diameter of boltsand flange bolt holes, combining values from the twosystems constitutes nonconformance with the Standard
1.7 Service ConditionsCriteria for selection of materials suitable for particular fluid service are not within the scope of this Standard
18 Convention
For the purpose of determining conformance withthis Standard, the convention for fixing significant digitswhere limits, maximum and minimum values are specified, shall be rounded as defined in ASTM Practice E29， This requires that an observed or calculated valueshall be rounded off to the nearest unit in the last righthand digit used for expressing the limit. Decimal valuesand tolerances do not imply a particular method of measurement.