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Eng-Calculations

Dimensions of PN 250 flanges

This diagram illustrates the arrangement but not necessarily the correct number of bolt holes

Flange type 05

Flange type 11

Flange type 21

DN	Outside diameter $ D $ , in $ \mathrm{mm} $	Diameter of bolt circle $ K $ , in $ \mathrm{mm} $	Diameter of bolt hole $ L $ , in $ \mathrm{mm} $	Number of bolts	Bolts size	Outside diameter of neck $ A $ , in $ \mathrm{mm} $	Flange thickness $ C_4 $ , in $ \mathrm{mm} $	Flange thickness $ C_2 $ , in $ \mathrm{mm} $	Flange thickness $ C_3 $ , in $ \mathrm{mm} $	Centre portion $ G_{max} $ , in $ \mathrm{mm} $	Length $ H_2 $ , in $ \mathrm{mm} $	Length $ H_3 $ , in $ \mathrm{mm} $	Neck diameters $ N_1 $ , in $ \mathrm{mm} $	Neck diameters $ N_3 $ , in $ \mathrm{mm} $	Corner radius $ R_1 $ for flange type 11, in $ \mathrm{mm} $	Corner radius $ R_1 $ for flange type 21, in $ \mathrm{mm} $
10	125	85	18	4	M16	-	-	-	24	-	-	-	-	46	-	4
15	130	90	18	4	M16	21.3	26	26	26	-	60	6	48	52	4	4
25	150	105	22	4	M20	33.7	28	28	28	-	65	8	60	63	4	4
40	185	135	26	4	M24	48.3	34	34	34	-	80	10	84	90	6	4
50	200	150	26	8	M24	60.3	38	38	38	-	85	10	95	102	6	5
65	230	180	26	8	M24	76.1	42	42	42	36	95	12	124	125	6	5
80	255	200	30	8	M27	101.6	46	46	46	46	102	12	136	142	8	6
100	300	235	33	8	M30	127	54	54	54	62	120	14	164	168	8	6
125	340	275	33	12	M30	152.4	60	60	60	86	140	16	200	207	8	6
150	390	320	36	12	M33	177.8	68	68	68	109	160	18	240	246	10	8
200	485	400	42	12	M39	244.5	85	82	82	150	190	25	305	314	10	8
250	585	490	48	16	M45	298.5	104	100	100	171	215	30	385	394	12	10
300	690	590	52	16	M48	-	-	-	120	-	-	-	-	480	-	10