EN 1092-1 Type 02 & Type 04 Loose Plate Flanges

Construction Characteristics

Both EN 1092-1 Type 02 and Type 04 flanges are loose plate flanges, which resemble the function of lap joint flanges of ASME B16.5. They can be viewed as a Type 01 slip-on plate flange with enlarged bore diameter and chamfered end to facilitate the insert of a lapped collar. Bolt holes shall be drilled along the periphery of the round plate in uniform distribution. There is some subtle difference between Type 02 and Type 04 loose plate flanges. The bore diameter of Type 04 is much larger than that of Type 02 of the same size and pressure rating. This is because the Type 04 flange shall always be able to accommodate the larger neck outside diameter of a tapered collar (Type 34).

EN 1092-1 Loose Plate Flanges & Collars
Type 02	Type 04	Type 32	Type 33
Type 34	Type 35	Type 36	Type 37

*Click to view specifications for all EN 1092-1 loose plate flanges & collars.

How to Use?

Similar to the lap joint flange & stub end assembly, the EN 1092-1 Type 02 loose plate flange shall always be used with a Type 32, Type 33, Type 35, Type 36, or Type 37 collar or lapped pipe end. The EN 1092-1 Type 04 loose plate flange shall always be used with the Type 34 weld-neck collar which has a tapered neck. As illustrated in Figure-2 (items 6 & 6′), the “collar” or “lapped pipe end” shall be furnished in straight pipe length with one end “lapped” or “flared” at right angles to the pipe axis. The EN 1092-1 Type 02 loose plate flange slips over the end of the pipe and sits properly onto the back face of the lapped collar. The loose plate flange can rotate to align bolt holes conveniently and is easily dismantled. Two identical sets of such “Type 02 + collar” assembly are bolted together with a flat gasket in between. Tightening the bolts causes the gasket material to flow into the minor machining imperfections, resulting in a fluid-tight seal. The piping is attached to the lapped collar by a full penetration welding process – butt welding. The fluid flowing through the flanged joint is only in contact with the lapped collar. The Type 02 loose plate flange has no contact with the fluid functioning as a back ring to support the collar.

Since the gasket-contacting surface of the lapped collar has dimensions of raised face, the “Type 02 + collar” assembly can be bolted together with a common flange with raised face in the same size as illustrated in Figure-3. The gaskets furnished to the joint may be non-metallic flat gaskets with or without inserts in accordance with EN 1514-1 or spiral wound gaskets in accordance with EN 1514-2. Provided a very smooth lapped surface (mirror-like finish) of the collar is produced by grinding, the metal-to-metal sealing can be achieved. Because it is expensive to grind the lapped surface to obtain fluid-tight joints, a gasket of some softer material is usually inserted between contact faces. EN 1092-1 Type 04 loose plate flange has exactly the same function as the Type 02 flange except that it is solely used with a Type 34 weld-neck collar which has a tapered neck.

Applications: Advantages & Disadvantages

EN 1092-1 Type 02 and Type 04 loose plate flanges with relative collar assemblies are primarily used on various piping systems that necessitate frequent dismantling for inspection or routine maintenance. It is also used in the installation of large diameter or hard-to-adjust piping configurations because of its quick bolt hole alignment. Especially in high alloy pipe work, a high alloy collar with a carbon steel loose plate flange is cheaper than a complete high alloy flange. These flanges are commonly used in mild service, where loads applied by the pipe to the flange connection are small. The longitudinal stresses in the piping resulting from pressure, weight, and thermal expansion shall be carefully calculated. Type 02 flanges are available in PN designations from PN 2.5 to PN 40, while Type 04 flanges are available in PN designations from PN 10 to PN 40.

Materials & Manufacture

EN 1092-1 Type 02 & Type 04 loose plate flanges are primarily made from a series of carbon steel or low alloy steel material grades such as P250GH, P245GH, S235JR, A105, P280GH, 16Mo3, P235GH, P265GH, P355NH, P355QH, etc. They can be made by a forging process or machined from bars or plates. They may also be made by a combined bending and electric welding process.

Dimensions & Masses

DN	D mm	K mm	B mm	E mm
10	75	50	21	3
15	80	55	25	3
20	90	65	31	4
25	100	75	38	4
32	120	90	46	5
40	130	100	53	5
50	140	110	65	5
65	160	130	81	6
80	190	150	94	6
100	210	170	120	6
125	240	200	145	6
150	265	225	174	6
200	320	280	226	6
250	375	335	281	8
300	440	395	333	8
350	490	445	365	8
400	540	495	416	8
450	595	550	467	8
500	645	600	519	8
600	755	705	622	8
700	860	810	721	4
800	975	920	824	4
900	1075	1020	926	4
1000	1175	1120	1028	4
1200	1375	1320	1234	5

*D, K, B, E dimensions for EN 1092-1 Type 02 PN 2.5.

DN	C mm	n	d mm
10	12	4	11
15	12	4	11
20	14	4	11
25	14	4	11
32	16	4	14
40	16	4	14
50	16	4	14
65	16	4	14
80	18	4	18
100	18	4	18
125	20	8	18
150	20	8	18
200	22	8	18
250	24	12	18
300	24	12	22
350	26	12	22
400	28	16	22
450	30	16	22
500	30	20	22
600	32	20	26
700	40	24	26
800	44	24	30
900	48	24	30
1000	52	28	30
1200	60	32	30

*C, n & d dimensions for EN 1092-1 Type 02 PN 2.5.

DN	D mm	K mm	B mm	E mm
10	75	50	21	3
15	80	55	25	3
20	90	65	31	4
25	100	75	38	4
32	120	90	46	5
40	130	100	53	5
50	140	110	65	5
65	160	130	81	6
80	190	150	94	6
100	210	170	120	6
125	240	200	145	6
150	265	225	174	6
200	320	280	226	6
250	375	335	281	8
300	440	395	333	8
350	490	445	365	8
400	540	495	416	8
450	595	550	467	8
500	645	600	519	8
600	755	705	622	8
700	860	810	721	4
800	975	920	824	4
900	1075	1020	926	4
1000	1175	1120	1028	4
1200	1405	1340	1234	5

*D, K, B, E dimensions for EN 1092-1 Type 02 PN 6.

DN	C mm	n	d mm	Mass kg
10	12	4	11	0.345
15	12	4	11	0.388
20	14	4	11	0.568
25	14	4	11	0.688
32	16	4	14	1.12
40	16	4	14	1.29
50	16	4	14	1.42
65	16	4	14	1.76
80	18	4	18	2.84
100	18	4	18	3.10
125	20	8	18	4.12
150	20	8	18	4.53
200	22	8	18	6.51
250	24	12	18	8.32
300	24	12	22	11.1
350	26	12	22	15.9
400	28	16	22	18.8
450	30	16	22	23.3
500	30	20	22	24.9
600	32	20	26	33.0
700	40	24	26	50.1
800	44	24	30	67.7
900	48	24	30	81.7
1000	52	28	30	95.5
1200	60	32	33	154

*C, n & d dimensions and masses for EN 1092-1 Type 02 PN 6.

DN	D mm	K mm	B mm	E mm
10	90	60	21	3
15	95	65	25	3
20	105	75	31	4
25	115	85	38	4
32	140	100	47	5
40	150	110	53	5
50	165	125	65	5
65	185	145	81	6
80	200	160	94	6
100	220	180	120	6
125	250	210	145	6
150	285	240	174	6
200	340	295	226	6
250	395	350	281	8
300	445	400	333	8
350	505	460	365	8
400	565	515	416	8
450	615	565	467	8
500	670	620	519	8
600	780	725	622	8
700	895	840	721	8
800	1015	950	824	8
900	1115	1050	926	8
1000	1230	1160	1028	8
1200	1455	1380	1234	8

*D, K, B, E dimensions for EN 1092-1 Type 02 PN 10.

DN	C mm	n	d mm	Mass kg
10	14	4	14	0.591
15	14	4	14	0.654
20	16	4	14	0.909
25	16	4	14	1.08
32	18	4	18	1.77
40	18	4	18	2.02
50	20	4	18	2.52
65	20	8	18	3.05
80	20	8	18	3.48
100	22	8	18	4.20
125	22	8	18	5.21
150	24	8	22	6.89
200	24	8	22	8.87
250	26	12	22	11.2
300	26	12	22	12.8
350	30	16	22	20.9
400	32	16	26	26.4
450	36	20	26	32.2
500	38	20	26	38.5
600	42	20	30	52.2
700	50	24	30	79.4
800	56	24	33	112
900	62	28	33	135
1000	70	28	36	180
1200	83	32	39	278

*C, n & d dimensions and masses for EN 1092-1 Type 02 PN 10.

DN	D mm	K mm	B mm	E mm
10	90	60	21	3
15	95	65	25	3
20	105	75	31	4
25	115	85	38	4
32	140	100	47	5
40	150	110	53	5
50	165	125	65	5
65	185	145	81	6
80	200	160	94	6
100	220	180	120	6
125	250	210	145	6
150	285	240	174	6
200	340	295	226	6
250	405	355	281	8
300	460	410	333	8
350	520	470	365	8
400	580	525	416	8
450	640	585	467	8
500	715	650	519	8
600	840	770	622	8
700	910	840	721	8
800	1025	950	824	8
900	1125	1050	926	8
1000	1255	1170	1030	8

*D, K, B, E dimensions for EN 1092-1 Type 02 PN 16.

DN	C mm	n	d mm	Mass kg
10	14	4	14	0.591
15	14	4	14	0.654
20	16	4	14	0.909
25	16	4	14	1.08
32	18	4	18	1.77
40	18	4	18	2.02
50	20	4	18	2.52
65	20	8	18	3.05
80	20	8	18	3.48
100	22	8	18	4.20
125	22	8	18	5.21
150	24	8	22	6.89
200	26	12	22	9.31
250	29	12	26	13.5
300	32	12	26	18.0
350	35	16	26	27.0
400	38	16	30	34.6
450	42	20	30	44.6
500	46	20	33	62.0
600	55	20	36	98.8
700	63	24	36	107
800	74	24	39	152
900	82	28	39	184
1000	90	28	42	257

*C, n & d dimensions and masses for EN 1092-1 Type 02 PN 16.

DN	D mm	K mm	B mm	E mm
10	90	60	21	3
15	95	65	25	3
20	105	75	31	4
25	115	85	38	4
32	140	100	47	5
40	150	110	53	5
50	165	125	65	5
65	185	145	81	6
80	200	160	94	6
100	235	190	120	6
125	270	220	145	6
150	300	250	174	6
200	360	310	226	6
250	425	370	281	8
300	485	430	333	8
350	555	490	365	8
400	620	550	416	8
450	670	600	467	8
500	730	660	519	8
600	845	770	622	8
700	960	875	721	8
800	1085	990	824	8

*D, K, B, E dimensions for EN 1092-1 Type 02 PN 25.

DN	C mm	n	d mm	Mass kg
10	14	4	14	0.591
15	14	4	14	0.654
20	16	4	14	0.909
25	16	4	14	1.08
32	18	4	18	1.77
40	18	4	18	2.02
50	20	4	18	2.52
65	22	8	18	3.05
80	24	8	18	3.48
100	26	8	22	4.20
125	28	8	26	5.21
150	30	8	26	6.89
200	32	12	26	13.8
250	35	12	30	19.4
300	38	16	30	25.5
350	42	16	33	40.5
400	48	16	36	56.1
450	54	20	36	67.8
500	58	20	36	84.6
600	68	20	39	124
700	85	24	42	188
800	95	24	48	259

*C, n & d dimensions and masses for EN 1092-1 Type 02 PN 25.

DN	D mm	K mm	B mm	E mm
10	90	60	21	3
15	95	65	25	3
20	105	75	31	4
25	115	85	38	4
32	140	100	47	5
40	150	110	53	5
50	165	125	65	5
65	185	145	81	6
80	200	160	94	6
100	235	190	120	6
125	270	220	145	6
150	300	250	174	6
200	375	320	226	6
250	450	385	281	8
300	515	450	333	8
350	580	510	365	8
400	660	585	416	8
450	685	610	467	8
500	755	670	519	8
600	890	795	622	8

*D, K, B, E dimensions for EN 1092-1 Type 02 PN 40.

DN	C mm	n	d mm	Mass kg
10	14	4	14	0.591
15	14	4	14	0.654
20	16	4	14	0.909
25	16	4	14	1.08
32	18	4	18	1.77
40	18	4	18	2.02
50	20	4	18	2.65
65	22	8	18	3.36
80	24	8	18	4.18
100	26	8	22	5.87
125	28	8	26	7.95
150	30	8	26	9.97
200	36	12	30	17.4
250	42	12	33	28.4
300	52	16	33	43.6
350	58	16	36	64.9
400	65	16	39	95.1
450	-	20	39	-
500	-	20	42	-
600	-	20	48	-

*C, n & d dimensions and masses for EN 1092-1 Type 02 PN 40.

DN	D mm	K mm	B' mm	E mm
10	90	60	31	3
15	95	65	35	3
20	105	75	42	4
25	115	85	49	4
32	140	100	59	5
40	150	110	67	5
50	165	125	77	5
65	185	145	96	6
80	200	160	108	6
100	220	180	134	6
125	250	210	162	6
150	285	240	188	6
200	340	295	240	6
250	395	350	294	8
300	445	400	348	8
350	505	460	400	8
400	565	515	450	8
450	615	565	498	8
500	670	620	550	8
600	780	725	650	8

*D, K, B’, E dimensions for EN 1092-1 Type 04 PN 10.

DN	C mm	n	d mm	Mass kg
10	14	4	14	0.549
15	14	4	14	0.606
20	16	4	14	0.836
25	16	4	14	0.990
32	18	4	18	1.65
40	18	4	18	1.85
50	20	4	18	2.34
65	20	8	18	2.76
80	20	8	18	3.17
100	22	8	18	3.78
125	22	8	18	4.57
150	24	8	22	6.22
200	24	8	22	7.90
250	26	12	22	9.99
300	26	12	22	11.1
350	30	16	22	14.7
400	32	16	26	20.5
450	36	20	26	25.5
500	38	20	26	30.7
600	42	20	30	43.0

*C, n & d dimensions and masses for EN 1092-1 Type 04 PN 10.

DN	D mm	K mm	B' mm	E mm
10	90	60	31	3
15	95	65	35	3
20	105	75	42	4
25	115	85	49	4
32	140	100	59	5
40	150	110	67	5
50	165	125	77	5
65	180	145	96	6
80	200	160	108	6
100	220	180	134	6
125	250	210	162	6
150	285	240	188	6
200	340	295	240	6
250	405	355	294	8
300	460	410	348	8
350	520	470	400	8
400	580	525	454	8
450	640	585	500	8
500	715	650	556	8
600	840	770	660	8

*D, K, B’, E dimensions for EN 1092-1 Type 04 PN 16.

DN	C mm	n	d mm	Mass kg
10	14	4	14	0.549
15	14	4	14	0.606
20	16	4	14	0.836
25	16	4	14	0.990
32	18	4	18	1.65
40	18	4	18	1.85
50	20	4	18	2.34
65	20	8	18	2.76
80	20	8	18	3.17
100	22	8	18	3.78
125	22	8	18	4.57
150	24	8	22	6.22
200	26	12	22	8.37
250	29	12	26	12.4
300	32	12	26	16.3
350	35	16	26	21.5
400	38	16	30	27.1
450	42	20	30	36.7
500	46	20	33	51.1
600	55	20	36	78.3

*C, n & d dimensions and masses for EN 1092-1 Type 04 PN 16.

DN	D mm	K mm	B' mm	E mm
10	90	60	31	3
15	95	65	35	3
20	105	75	42	4
25	115	85	49	4
32	140	100	59	5
40	150	110	67	5
50	165	125	77	5
65	185	145	96	6
80	200	160	114	6
100	235	190	138	6
125	270	220	166	6
150	300	250	194	6
200	360	310	250	6
250	425	370	302	8
300	485	430	356	8
350	555	490	408	8
400	620	550	462	8
450	670	600	510	8
500	730	660	568	8
600	845	770	670	8

*D, K, B’, E dimensions for EN 1092-1 Type 04 PN 25.

DN	C mm	n	d mm	Mass kg
10	14	4	14	0.549
15	14	4	14	0.606
20	16	4	14	0.836
25	16	4	14	0.990
32	18	4	18	1.65
40	18	4	18	1.85
50	20	4	18	2.34
65	22	8	18	2.76
80	24	8	18	3.17
100	26	8	22	3.78
125	28	8	26	4.57
150	30	8	26	6.22
200	32	12	26	11.6
250	35	12	30	17.0
300	38	16	30	22.0
350	42	16	33	32.1
400	48	16	36	44.5
450	54	20	36	54.2
500	58	20	36	65.9
600	58	20	39	98.4

*C, n & d dimensions and masses for EN 1092-1 Type 04 PN 25.

DN	D mm	K mm	B' mm	E mm
10	90	60	31	3
15	95	65	35	3
20	105	75	42	4
25	115	85	49	4
32	140	100	59	5
40	150	110	67	5
50	165	125	77	5
65	185	145	96	6
80	200	160	114	6
100	235	190	138	6
125	270	220	166	6
150	300	250	194	6
200	360	310	250	6
250	425	370	302	8
300	485	430	356	8
350	555	490	408	8
400	620	550	462	8
450	670	600	510	8
500	730	660	568	8
600	845	770	670	8

*D, K, B’, E dimensions for EN 1092-1 Type 04 PN 40.

DN	C mm	n	d mm	Mass kg
10	14	4	14	0.549
15	14	4	14	0.606
20	16	4	14	0.836
25	16	4	14	0.990
32	18	4	18	1.65
40	18	4	18	1.85
50	20	4	18	2.47
65	22	8	18	3.04
80	24	8	18	3.61
100	26	8	22	5.18
125	28	8	26	6.89
150	30	8	26	8.69
200	36	12	30	14.9
250	42	12	33	23.8
300	52	16	33	36.0
350	58	16	36	50.4
400	65	16	39	75.5
450		20	39
500		20	42
600		20	48

*C, n & d dimensions and masses for EN 1092-1 Type 04 PN 40.

Tolerances

Tolerances for bore diameter B & B’: (1) for size ≤ DN 100, (0 mm, +0.5 mm); (2) for DN 100 < size ≤ DN 400, (0 mm, 1.0 mm); (3) for DN 400 < size ≤ DN 600, (0 mm, +1.5 mm); (4) for size > DN 600, (0 mm, +3.0 mm). Tolerances for outside diameter of flange D: (1) for size ≤ DN 150, (-2.0 mm, +2.0 mm); (2) for DN 150 < size ≤ DN 500, (-3.0 mm, +3.00 mm); (3) for DN 500 < size ≤ DN 1200, (-5.0 mm, +5.00 mm). Tolerances for flange thickness C: (1) for C ≤ 18 mm, (-1.3 mm, +1.0 mm); (2) for 18 mm < C ≤ 50 mm, (-1.5 mm, +1.5 mm); (3) for C > 50 mm, (-2.0 mm, +2.0 mm). Tolerances for bolt circle diameter K: (1) for bolt size M10 to M24, (-1.0 mm, +1.0 mm); (2) for bolt size M27 to M45, (-1.5 mm, +1.5 mm); (3) for bolt size > M45, (-2.0 mm, +2.0 mm). Tolerances for bolt hole diameter d: (1) for bolt size M10 to M24, (0 mm, +1.0 mm); (2) for bolt size M27 to M45, (0 mm, +2.5 mm); (3) for bolt size > M45, (0 mm, +4.0 mm).