BS 3293 Class 150 SO

The Slip-on flange has a low hub because the pipe slips into the flange prior to welding. It is welded both inside and out to provide suffcient strength and prevent leakage. 

Slip-on flanges are all bored slightly larger than the O.D. of the pipe. They are preferred over welding neck flanges bu many users due to their lower intial cost, but final intallation cost is probably not much less than that of the welding neck flange because of the additional welding involved.

Nominal pipe size	Outside diameter of flange, O	Outside diameter, R	Thickness of flange min., C	Outside diameter of large end of hub, X	Length through hub, Y	Fillet radius	Flange bore, B	Diameter of bolt circle, D	Diameter of bolt holes	Number of bolt holes	Approxi-mate Weight kgs
26	869.95	742.95	50.80	723.90	85.73	6.35	666.75	806.45	34.93	24	104.09
28	927.10	793.75	52.39	781.05	87.31	6.35	717.55	863.60	34.93	28	118.94
30	984.25	857.25	53.98	831.85	88.90	6.35	768.35	914.40	34.93	28	134.56
32	1060.45	908.05	57.15	889.00	92.08	7.94	819.15	977.90	41.28	28	166.33
34	1111.25	958.85	58.74	939.80	93.66	7.94	869.95	1028.70	41.28	32	178.16
36	1168.40	1022.35	60.33	996.95	95.25	7.94	920.75	1085.85	41.28	32	201.15
38	1238.25	1073.15	60.33	1060.45	95.25	9.53	971.55	1149.35	41.28	32	234.77
40	1289.05	1123.95	63.50	1111.25	98.43	9.53	1022.35	1200.15	41.28	36	255.04
42	1346.20	1193.80	66.68	1168.40	101.60	9.53	1073.15	1257.30	41.28	36	289.32
44	1403.35	1244.60	66.68	1219.20	101.60	11.11	1123.95	1314.45	41.28	40	307.07
46	1454.15	1295.40	68.26	1270.00	103.19	11.11	1174.75	1365.25	41.28	40	327.20
48	1511.30	1358.90	69.85	1327.15	104.78	11.11	1225.55	1422.40	41.28	44	357.05

Note: 7 mm raised face regularly furnished on Classes 150 and 300 unless otherwise ordered.