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Eng-Calculations

Dimensions of PN 320 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	17.2	24	24	24	-	58	6	44	46	4	4
15	130	90	18	4	M16	21.3	26	26	26	-	60	6	48	52	4	4
25	160	115	22	4	M20	33.7	34	34	34	-	78	8	68	72	4	4
40	195	145	26	4	M24	48.3	38	38	38	-	88	10	92	96	6	5
50	210	160	26	8	M24	63.5	42	42	42	-	100	10	106	110	6	5
65	255	200	30	8	M27	88.9	51	51	51	-	120	12	138	137	6	6
80	275	220	30	8	M27	101.6	55	55	55	43	130	14	156	160	8	6
100	335	265	36	8	M33	133	65	65	65	58	145	16	186	190	8	8
125	380	310	36	12	M33	168.3	75	75	75	78	175	20	230	235	8	8
150	425	350	39	12	M36	193.7	84	84	84	94	195	25	265	266	10	10
200	525	440	42	16	M39	244.5	103	103	103	140	235	30	345	350	10	10
250	640	540	52	16	M48	323.9	125	125	125	190	300	40	428	432	12	10