ASME B16.47:1996 pdf download LARGE DIAMETER STEEL FLANGES NPS 26 Through NPS 60
1.1 General
This Standard covers pressure-temperature ratingsmaterials, dimensions, tolerances, marking, and testingfor pipe flanges in sizes NPS 26 through NPS 60 andin ratings Classes 75，150，300，400，600,and 900Flanges may be cast, forged, or plate (for blind flangesonly) materials,as listed in Table 1A.
Requirements and recommendations regarding boltingand gaskets are also included.
1.2 Flange Series
This Standard provides two series of flange dimen-sions, Series A specifies flange dimensions for genera)use flanges.Series B specifies fange dimensions forcompact flanges which, in general, have smaller boltcircle diameters than Series A flanges. These two seriesof flanges are not interchangeable. The user shouldrecognize that some flanged valves, equipment boltedbetween fangesand flanged equipment may only becompatible with bolt circle diameter of one series offlanges.
1.3 References
1.3.1 Referenced Standards. Standards and spec-ifications adopted by reference in this Standard areshown in Annex E, which is part of this Standard. Itis not considered practical to identify the specific editionof each standard and specification in the individualreferences. Instead, the specific edition reference isidentified in Annex EA fange manufactured in accordance with earlier editions of the referenced standardsand in all other respects conforming to this Standardwill be considered to be in conformancewith thisStandard.
1.3.2 Codes and Requlations.A fange usedunder the jurisdiction of the ASME Boiler and PressureVessel Code (ASME BPV Code), the ASME Code forPressure Piping, or a governmental regulation is subjectto any limitation of that code or regulation. This includesany maximum temperature limitation,rule governingthe use of a material at low temperature, or provisions for operation at a pressure exceeding the pressure-temperature ratings in this Standard.
1.4 Applicable Ratings
The pressure-temperature ratings in this Standard areapplicable upon its publication to all flanges within itsscope which otherwise meet its requirements. For unusedflanges maintained in inventory, the manufacturer ofthe flange may certify conformance to this Edition.provided he can demonstrate that all requirements ofthis Edition have been met. Where such componentswere installed in accordance with the pressure-temperature ratings of an earlier edition of this Standard, thoseratings are applicable, except as may be governed bythe applicable code or regulation (see para. 1.3.2).
1.5 User Accountability
This Standard cites duties and responsibilities thatare to be assumed by the user in the areas of application.installation, hydrostatic testing, operation,and materialselection.
1.6 Quality Systems
Nonmandatory requirements relating to the productmanufacturer’s Quality System Program are describedin Annex D
2 PRESSURE-TEMPERATURE RATINGS
2.1 Rating Basis
Ratings are maximum allowable working gage pressures, at the temperatures shown in Table 2 for theapplicable material and rating. For intermediate temperatures, linear interpolation is permitted, See Annex A folmethods of establishing pressure-temperature ratings
2.2 Ratings of Flanged Joints
A fanged joint is composed of three separate andindependent，although interrelated, components: theflanges, the gasket, and the bolting, which are assembledby yet another influence, the assembler. Proper controlsmust be exercised in the selection and application forall these elements in order to attain a joint which has
ASME B16.47:1996 pdf download
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