ASME B16.1:2015 pdf free download – Gray lron Pipe Flanges and Flanged Fittings
7.2 Facing
(a) Classes 25 and 125 gray iron flanges and flangedfittings shall be flat faced (i.e.,without projection orraised face) and finished in accordance w ith MsS SP-6.
(b)Class 250 flanges and flanged fittings shall havea 2 mm (0.06 in.) raised face of the diam eters given inTable 2 and finished in accordance w ith MsS SP-6.Theraised face is included in the minimum flange thicknessand center-to-face dimension.
7.3 Center-to-Face Dimensions
7.3.1 Side Outlet Fittings. Side outlet elbow s, sideoutlet tees,and sideoutlet crosses shall haveall openingson intersecting centerlines.Long-radius elbows withside outlet shall have the side outlet on the radial center-line of the elbow.
7.3.2 Elbows
(a) The center-to-face dimensions for straight-size9o-deg elbow s,90-deg long-radius elbow s, 45-degelbow s, side-outlet 9o-deg elbow s, and double-branchelbow s are shown in Tables 3, 4,and 5.
(b) Reducing 90-deg elbows,reducing 90-deg long-radius elbows, reducing side-outlet 90-deg elbow s, andreducing double-branch elbow s shall have the samecenter-to-face dim ensionsas straight-size fittings shownin Tables 3, 4,and 5 corresponding to the size of thelargest opening.
(c) For 9o-deg long-radius elbows with side outlet,the center-to-face dim ensions of the side outlet shall bethe same as dimension A in Tables 3, 4,and 5 for astraight-size 90-deg elbow corresponding to the size ofthe largest opening.
(d)Special-degree elbow s ranging from 1 deg to45 deg, inclusive, shall have the same center-to-facedim ensionsas those for 45-deg elbows those ov er 45 degand up to 90 deg, inclusive, shall have the same center-to-face dimensionsasthose for 90-deg elbow s.The angled esignation of an elbow is the angle betw een theflange faces.
7.3.3 Tees,Crosses,and Laterals
(a) The center-to-face dimensions for straight-sizetees and crosses, with or without side outlet, and lateralsare shown in Tables 3,4,and 5.
(b) Reducing tees and reducing crosses, with or with-out side outlet, and reducing laterals, NPS 16 andsmaller,shall have the same center-to-face dimensionsas straight-size fittings shown in Tables 3,4,and 5corres-ponding to the size of the largest opening. For NPS 18and larger, if the outlet of a reducing tee the branch ofa reducing lateral or the largest outlet of a reducing side outlet tee, reducing cross, and reducing side outletcross is the same size or smaller than given in Tables 3,4,and 5(short body pattern),the center-to-face dim ensionsshown in these Tables shall be used. If a branch or anyoutlet is larger than shown in Tables 3, 4and 5. thecenter-to-face dimensions shall be the same as for thestraight-size fitting shown in Tables 3, 4, and 5 corres-ponding to the size of the largest opening.Tees, crosses,and laterals, reducing on the run only, shall have thesame center-to-face dim ensions as straight-size fittingsshown in Tables 3, 4,and 5 corresponding to the sizeof the largest opening.
(c) Tees reducing on both runs are generally know nas bull-head tees and have the same center-to-facedimensions as straight-size fittings corresponding to thesize of the outlet.
7.3.4 True Y’s. Center-to-face dim ensions forstraight-size true Y sare shown in Tables 4 and 5.Reduc-ing sizes are considered special and should be made tosuit conditions.
7.3.5 Reducers and Eccentric Reducers.The face-to-face dim ensions for all reductions of reducers andeccentric reducers shall be the same as given in Tables 4and 5 for the largest opening.
7.4 Center-to-Face Tolerances
The follow ing tolerances shall be permitted on allcenter-to-contact surface dim ensions of fittings Toler-ances for contact surface-to-contact surface dim ensionsshall be twice those given below. The largest openingin the fitting governs the tolerance to be applied to allopenings.