flange size(nominal) maximum service pressure rating standard ring number ------ R23 R24 pressure energized ring number BX151 BX151 BX151 RX23 RX24 A187 208 257 165 216 ---- D------ E------ 46 J51/4 53/4 73/4 561/2 K88888 ------ R26 R27 ------ R31 BX152 BX152 BX152 RX26 RX27 BX153 BX153 BX153 RX31 200 222 287 191 244 232 254 325 210 ---- -- ------ ------ ------ ------ 51/2 61/4 81/2 51/2 761/4 791/2 53/4 888888888 R31 R35 ------ R37 R37 R39 -- RX31 RX35 BX154 BX154 BX154 RX37 RX37 RX39 BX155 241 267 270 287 357 273 292 311 316 ---- 154 ------ 119 119 119 ------ -- ------ -- 61/2 73/4 773/4 101/4 61/2 71/2 81/2 81/4 888888888 ---- R41 R41 R44 -- R45 R45 R46 BX155 BX155 RX41 RX41 RX44 BX169 RX45 RX45 RX46 360 446 330 349 375 357 356 381 394 ------ ------ 224
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