ASME B16.1:2005 pdf download.Gray lron Pipe Flanges and Flanged Fittings.
6.2 Facing
(a) Classes 25 and 125 gray iron flanges and flanged fittings shall be fiat faced (i.e., without projection or raised 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 6 and finished in accordance with MSS SP-6. The raised face is included in the minimum flange thickness and center-to-face dimension.
6.3 Center-to-Face DImensions
6.3.1 Side Outlet Fillings. Side outlet elbows, side outlet tees, and side outlet crosses shall have all openings on intersecting centerlines. Long-radius elbows with side outlet shall have the side outlet on the radial centerline of the elbow
6.3.2 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 3, 5, and 7.
(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 3,5, and 7 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 same as dimension A in Tables 3, 5, and 7 for a straight-size 90 deg elbow corresponding to the size of the Largest opening.
(d) Special-degree elbows ranging from I deg to 45 deg, inclusive, shall have the same center-to-face dimensions as those for 45 deg elbows; those over 45 deg and up to 90 deg.. inclusive, shall have the same center- to-face dimensions as those for 90 deg elbows. The angle designation of an elbow is the angle between the flange faces.
(a) Classes 25 and 125 gray iron flanges and flanged fittings shall be fiat faced (i.e., without projection or raised 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 6 and finished in accordance with MSS SP-6. The raised face is included in the minimum flange thickness and center-to-face dimension.
6.3 Center-to-Face DImensions
6.3.1 Side Outlet Fillings. Side outlet elbows, side outlet tees, and side outlet crosses shall have all openings on intersecting centerlines. Long-radius elbows with side outlet shall have the side outlet on the radial centerline of the elbow
6.3.2 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 3, 5, and 7.
(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 3,5, and 7 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 same as dimension A in Tables 3, 5, and 7 for a straight-size 90 deg elbow corresponding to the size of the Largest opening.
(d) Special-degree elbows ranging from I deg to 45 deg, inclusive, shall have the same center-to-face dimensions as those for 45 deg elbows; those over 45 deg and up to 90 deg.. inclusive, shall have the same center- to-face dimensions as those for 90 deg elbows. The angle designation of an elbow is the angle between the flange faces.
