PAGE 19 RING GASKET MATERIAL MAXIMUM HARDNESS IDENTIFICATION Brinell Rockwell ‘B’ Scale ASME B16.20 API-6A Soft Iron 90 56 D D - 4 Low Carbon Steel 120 68 S S - 4 4 - 6 Chrome 1/2 Moly 130 72 F5 - Type 410 170 86 S410 - Type 304 160 83 S304 S304 - 4 Type 316 160 83 S316 S316 - 4 Type 347 160 83 S347 - RINGGASKETS&RINGGROOVEDIMENSIONS 4 TYPE R RING GASKETS (As per ASME B16.20) RING NO. ØP A B H C R1 R-11 1.344 0.250 0.44 0.38 0.170 0.06 R-12 1.563 0.313 0.56 0.50 0.206 0.06 R-13 1.688 0.313 0.56 0.50 0.206 0.06 R-14 1.750 0.313 0.56 0.50 0.206 0.06 R-15 1.875 0.313 0.56 0.50 0.206 0.06 R-16 2.000 0.313 0.56 0.50 0.206 0.06 R-17 2.250 0.313 0.56 0.50 0.206 0.06 R-18 2.375 0.313 0.56 0.50 0.206 0.06 R-19 2.563 0.313 0.56 0.50 0.206 0.06 R-20 2.688 0.313 0.56 0.50 0.206 0.06 R-21 2.844 0.438 0.69 0.63 0.305 0.06 R-22 3.250 0.313 056 0.50 0.206 0.06 R-23 3.250 0.438 0.69 0.63 0.305 0.06 R-24 3.750 0.438 0.69 0.63 0.305 0.06 R-25 4.000 0.313 0.56 0.50 0.206 0.06 R-26 4.000 0.438 0.69 0.63 0.305 0.06 R-27 4.250 0.438 0.75 0.63 0.305 0.06 R-28 4.375 0.500 0.56 0.69 0.341 0.06 R-29 4.500 0.313 0.69 0.50 0.206 0.06 R-30 4.625 0.438 0.69 0.63 0.305 0.06 R-31 4.875 0.438 069 0.63 0.305 0.06 R-32 5.000 0.500 0.75 0.69 0.341 0.06 R-33 5.188 0.313 0.56 0.50 0.206 0.06 R-34 5.188 0.438 0.69 0.63 0.305 0.06 R-35 5.375 0.438 0.69 0.63 0.305 0.06 R-36 5.875 0.313 0.56 0.50 0.206 0.06 R-37 5.875 0.438 0.69 0.63 0.305 0.06 R-38 6.188 0.625 0.88 0.81 0.413 0.06 R-39 6.375 0.438 0.69 0.63 0.305 0.06 R-40 6.750 0.313 0.56 0.50 0.206 0.06 R-41 7.125 0.438 0.69 0.63 0.305 0.06 R-42 7.500 0.750 1.00 0.94 0.485 0.06 R-43 7.625 0.313 0.56 0.50 0.206 0.06 R-44 7.625 0.438 0.69 0.63 0.305 0.06 R-45 8.313 0.438 0.69 0.63 0.305 0.06 R-46 8.313 0.500 0.75 0.69 0.341 0.06 1 Ring Joint Gaskets are either octagonal or oval made to ASME B16.20 in various sizes. These are identified by numbers R, RX or BX that relate to Flange size, pressure, class, and appropriate standards ASME B16.20 or API6A. Materials for these gaskets are selected based on suitability for service conditions. It is essential that Ring Joint Gaskets be of a hardness lower than the Flanges. The recommended hardness and their identification is given in table below: *All dimensions are in inches * Tolerances as per ASME B16.20 ØP H C A A B ØP Octagonal (Fig. 1) Oval (Fig. 2) (TYP.) 23° (TYP.) 23° (TYP.) R1