Special techniques, such as controlled bolt tightening, are described in ASME PCC-1 Mixed Flanged Joints Proper controls must be exercised in the selection and application for all these elements to attain a joint that has acceptable leak tightness. Flanged JointsĪ flanged joint is composed of separate and independent, although interrelated components: the flanges, gasket, and bolting, which are assembled by another influence, the assembler. The pressure-temperature rating is the maximum allowable working pressure (bar unit) of the material and grade used at the rated temperature (Celsius). NPS related to nominal diameter, DN in international standards, relations as below: In NPS, is designation for nominal flange or flange fittings size. ASME B16.5 Ratings DesignationĬlass, followed by a dimensionless number, is the designation for pressure-temperaure ratings as follows: More details visit Nonmandatory Appendix E in ASME B16.5. Customary units with diameter of bolts and flange bolt holes expressed in inch units.įlanged fittings with 150#, 300# in sizes of NPS 1/2 to NPS 24, expressed in inch Units.įlanged fittings with 400#, 600#, 900#, and 1500# from NPS 1/2 to NPS24, and 2500# from NPS 1/2 to NPS 12, which only US. For 2500# in sizes from NPS 1/2 to NPS 12, with requirements in both metric and U.S.
Blind flanges and certain reducing flanges made from cast, forged or plate materials.įlanges with rating class of 150#, 300#, 400#, 600#, 900# and 1500# in sizes NPS 1/2 to 24.Flanges and flanged fittings made from cast or forged materials.ASME B16.5 standard covers Steel Pipe Flanges and Flanged Fittings from NPS 1/2 through NPS 24 Metric/Inch in pressure class 150 to class 2500. This standard covers pressure-temperature ratings, materials, dimensions, tolerances, marking, testing, and methods of designating openings for pipe flange and flanged fittings.
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