FLANGES FOR PIPES, VALVES, FITTINGS AND ACCESSORIES

This European standard specifies requirements for circular steel flanges in PN designations PN 2,5 to PN 400
and nominal sizes from DN 10 to DN 4000.
 
This standard specifies the flange types and their facings, dimensions, tolerances, threading, bolt sizes,
flange face surface finish, marking, materials, pressure/ temperature ratings and flange masses.

Flange designation according to EN 1092-1

EN 1092-1	DN xx	PN yy	typ z	w
				w = flange joint face type
			typ zz = Flange type
		PN yy = Flange pressure class
	DN xx = Flange size
Standard for circular steel flanges

FLANGE FACING TYPES ACCORDING TO EN 1092-1

Type A: flat face	Type B: raised face	Type C: tongue face	Type D: groove face
Type E: spigot	Type F: recess	Type G: O Ring recess	Type H: O Ring groove

FLANGE FACING DIMENSIONS

PN	DN												f1	f2	f3	f4	W	X	Y	Z	Q	R
	2.5	6	10	16	25	40	63	100	160	250	320	400
	d1
10	35	35	40	40	40	40	40	40	40	40	40	40	2	4.5	4	2	24	34	35	23	-	2.5
15	40	40	45	45	45	45	45	45	45	45	45	45					29	39	40	28	-
20	50	50	58	58	58	58	58	58	58	58	58	58					36	40	51	35	41°
25	60	60	68	68	68	68	68	68	68	68	68	68					43	57	58	42
32	70	70	78	78	78	78	78	78	78	78	78	78					51	65	66	50
40	80	80	88	88	88	88	88	88	88	88	88	88	3				61	75	76	60
50	90	90	102	102	102	102	102	102	102	102	102	102					73	87	88	72
65	110	110	122	122	122	122	122	122	122	122	122	122					95	109	110	94
80	128	128	138	138	138	138	138	138	138	138	138	138					106	120	121	105
100	148	148	158	158	162	162	162	162	162	162	162	162		5	4.5	2.5	129	149	150	128	32°	3
125	178	178	188	188	188	188	188	188	188	188	188	188					155	175	176	154
150	202	202	212	212	218	218	218	218	218	218	218	218					183	203	204	182
200	258	258	268	268	278	285	285	285	285	285	285	285					239	259	260	238
250	312	312	320	320	335	345	345	345	345	345	345						292	312	213	291
300	365	365	370	378	395	410	410	410	410				4				343	363	364	342
350	415	415	430	438	450	465	465	465						5.5	5	3	395	421	422	394	27°	3.5
400	465	465	482	490	505	535	535	535									447	473	474	446
450	520	520	532	550	555	560	560	560									497	523	524	496
500	570	570	585	610	615	615	615	615									349	375	376	548
600	670	670	685	725	720	735	735						5.5				649	675	676	648
700	775	775	800	795	820	840	840										751	777	778	750
800	880	880	905	900	930	960	960										856	882	883	855
900	980	980	1005	1000	1030	1070	1070										961	987	988	960
1000	1080	1080	1110	1115	1140	1180	1180							6.5	6	4	1062	1092	1094	1060	28°	4

Flange facing types C, D, E, F, G and H are not used for PN 2,5 and PN 6.
Flange facing types G and H are only used for PN 10 to PN 40.