ASME B16.1 pdf download Gray Iron Pipe Flanges and Flanged Fittings Classes 25, 125, and 250
6.2 Bolting ASTM A307 Grade B bolting material is recommended forgrayiron flange assembly. Where grayiron flanges are bolted to steel flanges, see ASME B16.5 for bolting limita- tions.
7 FITTING DIMENSIONS AND TOLERANCES
7.1 Wall Thickness It is recognized that some variations are absolutely unavoidableinthemakingofpatternsandcastings.Equip- ment shall be designed to produce wall thicknesses given in the tables. Wall thickness at no point shall be less than 87.5% of the thickness given in the tables.
(a) Classes 25 and 125 gray iron flanges and flanged fittings shall be flatfaced (i.e., withoutprojectionorraised face) and finished in accordance with MSS SP-6.
(b) Class 250 flanges and flanged fittings shall have a 2 mm (0.06 in.) raised face of the diameters given in Table 7.6.1-3 and finished in accordance with MSS SP-6. The raised face is included in the minimum flange thickness and center-to-face dimension.
7.3 Center-to-Face Dimensions
7.3.1 Side Outlet Fittings. Side outlet elbows, side outlet tees, and side outlet crosses shall have all openings on intersecting centerlines. Long-radius elbows with side outletshall have the side outleton the radial centerline of the elbow.
7.3.2 Elbows (a) The center-to-face dimensions for straight-size 90- deg elbows, 90-deg long-radius elbows, 45-deg elbows, side-outlet 90-deg elbows, and double-branch elbows are shown in Tables 7.3.2-1 through 7.3.2-5.
(b) Reducing 90-deg elbows, reducing 90-deg long- radius elbows, reducing side-outlet 90-deg elbows, and reducing double-branch elbows shall have the same center-to-face dimensions as straight-size fittings shown in Tables
7.3.2-3 corresponding to the size of the largest opening.
(c) For 90-deg long-radius elbows with side outlet, the center-to-face dimensions of the side outlet shall be the sameasdimensionAinTables
7.3.2-3 fora straight-size90-degelbowcorrespondingtothesizeofthe largest opening.
(d) Special-degreeelbowsrangingfrom1 degto45 deg, inclusive, shall have the same center-to-face dimensions as those for45-degelbows; those over45 degand up to 90 deg, inclusive, shall have the same center-to-face dimen- sions as those for 90-degelbows. The angle designation of an elbow is the angle between the flange faces.
7.3.3 Tees, Crosses, and Laterals
(a) Thecenter-to-facedimensionsforstraight-sizetees and crosses, with or without side outlet, and laterals are shown in Tables
7.3.2-1 through 7.3.2-3.
(b) Reducing tees and reducing crosses, with or without side outlet, and reducing laterals, NPS 16 and smaller, shall have the same center-to-face dimensions as straight-size fittings shown in Tables 7.3.2-1 through 7.3.2-3 corresponding to the size of the largest opening. For NPS 18 and larger, ifthe outlet ofa reducing tee; thebranchofareducinglateral; orthelargestoutletof a reducing side outlet tee, reducing cross, and reducing side outlet cross is the same size or smaller than given in Tables 7.3.2-1 through 7.3.2-3 (short-body pattern), the center-to-face dimensions shown in these Tables shall be used. If a branch or any outlet is larger than shown in Tables7.3.2-1 through 7.3.2-3, the center-to- face dimensions shall be the same as for the straightsize fitting shown in Tables 7.3.2-1 through 7.3.2-3 corre- sponding to the size ofthe largest opening. Tees, crosses, and laterals, reducingon the run only, shall have the same center-to-face dimensions as straight-size fittings shown inTables 7.3.2-1 through7.3.2-3 correspondingto thesize of the largest opening.
(c) Tees reducing on both runs are generally known as bull-head tees and have the same center-to-face dimen- sions as straight-size fittings corresponding to the size of the outlet.
7.3.4 True Y’s. Center-to-face dimensions for straight- size true Y’s are shown in Tables 7.3.2-2 and 7.3.2-3. Re- ducingsizes are considered special and should be made to suit conditions.
7.3.5 Reducers and Eccentric Reducers. The face-to- face dimensions for all reductions of reducers and eccentric reducers shall be the same as given in Tables 7.3.2-2 and 7.3.2-3 for the largest opening.