» Flange & Fitting » EN 1092-1 Type 02 & Type 04 Loose Plate Flanges

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

May 14, 2021

Construction Characteristics

Drawing of EN 1092-1 Type 02 & 04

Figure-1: a typical drawing for EN 1092-1 type 01 & type 02 loose plate flanges. D: outside diameter of flange; K: diameter of bolt circle; d: diameter of bolt hole; n: number of bolting; E: chamfer; B: bore diameter of Type 02 flange; B’: diameter of Type 04 flange; C: flange thickness.

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 02Type 04Type 32Type 33
Type 34Type 35Type 36Type 37
*Click to view specifications for all EN 1092-1 loose plate flanges & collars.

How to Use?

EN 1092-1 "Type 02 + Type 35" joint

Figure-2: illustration of the “Type 02 + Type 35” flange joint in piping. It consists two pipes (1 & 8), two EN 1092-1 type 02 loose plate flanges (4 & 7), two EN 1092-1 type 35 weld ring necks/ collars (6 & 6′), a set of bolting (3), a flat gasket (5), and two butt welds (2 & 9) to attach the pipe to the collar.

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.

"Type 02 & Type 35" + RF flange

Figure-3: the “Type 02 + collar (Type 35)” bolted together with a RF flange. 1: pipe; 2: butt welds; 3: bolting; 4: Type 02 & Type 35 assembly; 5: gasket, 6: an integral flange with raised face.

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

DND
mm
K
mm
B
mm
E
mm
107550213
158055253
209065314
2510075384
3212090465
40130100535
50140110655
65160130816
80190150946
1002101701206
1252402001456
1502652251746
2003202802266
2503753352818
3004403953338
3504904453658
4005404954168
4505955504678
5006456005198
6007557056228
7008608107214
8009759208244
900107510209264
10001175112010284
12001375132012345
*D, K, B, E dimensions for EN 1092-1 Type 02 PN 2.5.

DNC
mm
nd
mm
1012411
1512411
2014411
2514411
3216414
4016414
5016414
6516414
8018418
10018418
12520818
15020818
20022818
250241218
300241222
350261222
400281622
450301622
500302022
600322026
700402426
800442430
900482430
1000522830
1200603230
*C, n & d dimensions for EN 1092-1 Type 02 PN 2.5.

DND
mm
K
mm
B
mm
E
mm
107550213
158055253
209065314
2510075384
3212090465
40130100535
50140110655
65160130816
80190150946
1002101701206
1252402001456
1502652251746
2003202802266
2503753352818
3004403953338
3504904453658
4005404954168
4505955504678
5006456005198
6007557056228
7008608107214
8009759208244
900107510209264
10001175112010284
12001405134012345
*D, K, B, E dimensions for EN 1092-1 Type 02 PN 6.

DNC
mm
nd
mm
Mass
kg
10124110.345
15124110.388
20144110.568
25144110.688
32164141.12
40164141.29
50164141.42
65164141.76
80184182.84
100184183.10
125208184.12
150208184.53
200228186.51
2502412188.32
30024122211.1
35026122215.9
40028162218.8
45030162223.3
50030202224.9
60032202633.0
70040242650.1
80044243067.7
90048243081.7
100052283095.5
1200603233154
*C, n & d dimensions and masses for EN 1092-1 Type 02 PN 6.

DND
mm
K
mm
B
mm
E
mm
109060213
159565253
2010575314
2511585384
32140100475
40150110535
50165125655
65185145816
80200160946
1002201801206
1252502101456
1502852401746
2003402952266
2503953502818
3004454003338
3505054603658
4005655154168
4506155654678
5006706205198
6007807256228
7008958407218
80010159508248
900111510509268
10001230116010288
12001455138012348
*D, K, B, E dimensions for EN 1092-1 Type 02 PN 10.

DNC
mm
nd
mm
Mass
kg
10144140.591
15144140.654
20164140.909
25164141.08
32184181.77
40184182.02
50204182.52
65208183.05
80208183.48
100228184.20
125228185.21
150248226.89
200248228.87
25026122211.2
30026122212.8
35030162220.9
40032162626.4
45036202632.2
50038202638.5
60042203052.2
70050243079.4
800562433112
900622833135
1000702836180
1200833239278
*C, n & d dimensions and masses for EN 1092-1 Type 02 PN 10.

DND
mm
K
mm
B
mm
E
mm
109060213
159565253
2010575314
2511585384
32140100475
40150110535
50165125655
65185145816
80200160946
1002201801206
1252502101456
1502852401746
2003402952266
2504053552818
3004604103338
3505204703658
4005805254168
4506405854678
5007156505198
6008407706228
7009108407218
80010259508248
900112510509268
10001255117010308
*D, K, B, E dimensions for EN 1092-1 Type 02 PN 16.

DNC
mm
nd
mm
Mass
kg
10144140.591
15144140.654
20164140.909
25164141.08
32184181.77
40184182.02
50204182.52
65208183.05
80208183.48
100228184.20
125228185.21
150248226.89
2002612229.31
25029122613.5
30032122618.0
35035162627.0
40038163034.6
45042203044.6
50046203362.0
60055203698.8
700632436107
800742439152
900822839184
1000902842257
*C, n & d dimensions and masses for EN 1092-1 Type 02 PN 16.

DND
mm
K
mm
B
mm
E
mm
109060213
159565253
2010575314
2511585384
32140100475
40150110535
50165125655
65185145816
80200160946
1002351901206
1252702201456
1503002501746
2003603102266
2504253702818
3004854303338
3505554903658
4006205504168
4506706004678
5007306605198
6008457706228
7009608757218
80010859908248
*D, K, B, E dimensions for EN 1092-1 Type 02 PN 25.

DNC
mm
nd
mm
Mass
kg
10144140.591
15144140.654
20164140.909
25164141.08
32184181.77
40184182.02
50204182.52
65228183.05
80248183.48
100268224.20
125288265.21
150308266.89
20032122613.8
25035123019.4
30038163025.5
35042163340.5
40048163656.1
45054203667.8
50058203684.6
600682039124
700852442188
800952448259
*C, n & d dimensions and masses for EN 1092-1 Type 02 PN 25.

DND
mm
K
mm
B
mm
E
mm
109060213
159565253
2010575314
2511585384
32140100475
40150110535
50165125655
65185145816
80200160946
1002351901206
1252702201456
1503002501746
2003753202266
2504503852818
3005154503338
3505805103658
4006605854168
4506856104678
5007556705198
6008907956228
*D, K, B, E dimensions for EN 1092-1 Type 02 PN 40.

DNC
mm
nd
mm
Mass
kg
10144140.591
15144140.654
20164140.909
25164141.08
32184181.77
40184182.02
50204182.65
65228183.36
80248184.18
100268225.87
125288267.95
150308269.97
20036123017.4
25042123328.4
30052163343.6
35058163664.9
40065163995.1
450-2039-
500-2042-
600-2048-
*C, n & d dimensions and masses for EN 1092-1 Type 02 PN 40.

DND
mm
K
mm
B'
mm
E
mm
109060313
159565353
2010575424
2511585494
32140100595
40150110675
50165125775
65185145966
802001601086
1002201801346
1252502101626
1502852401886
2003402952406
2503953502948
3004454003488
3505054604008
4005655154508
4506155654988
5006706205508
6007807256508
*D, K, B’, E dimensions for EN 1092-1 Type 04 PN 10.

DNC
mm
nd
mm
Mass
kg
10144140.549
15144140.606
20164140.836
25164140.990
32184181.65
40184181.85
50204182.34
65208182.76
80208183.17
100228183.78
125228184.57
150248226.22
200248227.90
2502612229.99
30026122211.1
35030162214.7
40032162620.5
45036202625.5
50038202630.7
60042203043.0
*C, n & d dimensions and masses for EN 1092-1 Type 04 PN 10.

DND
mm
K
mm
B'
mm
E
mm
109060313
159565353
2010575424
2511585494
32140100595
40150110675
50165125775
65180145966
802001601086
1002201801346
1252502101626
1502852401886
2003402952406
2504053552948
3004604103488
3505204704008
4005805254548
4506405855008
5007156505568
6008407706608
*D, K, B’, E dimensions for EN 1092-1 Type 04 PN 16.

DNC
mm
nd
mm
Mass
kg
10144140.549
15144140.606
20164140.836
25164140.990
32184181.65
40184181.85
50204182.34
65208182.76
80208183.17
100228183.78
125228184.57
150248226.22
2002612228.37
25029122612.4
30032122616.3
35035162621.5
40038163027.1
45042203036.7
50046203351.1
60055203678.3
*C, n & d dimensions and masses for EN 1092-1 Type 04 PN 16.

DND
mm
K
mm
B'
mm
E
mm
109060313
159565353
2010575424
2511585494
32140100595
40150110675
50165125775
65185145966
802001601146
1002351901386
1252702201666
1503002501946
2003603102506
2504253703028
3004854303568
3505554904088
4006205504628
4506706005108
5007306605688
6008457706708
*D, K, B’, E dimensions for EN 1092-1 Type 04 PN 25.

DNC
mm
nd
mm
Mass
kg
10144140.549
15144140.606
20164140.836
25164140.990
32184181.65
40184181.85
50204182.34
65228182.76
80248183.17
100268223.78
125288264.57
150308266.22
20032122611.6
25035123017.0
30038163022.0
35042163332.1
40048163644.5
45054203654.2
50058203665.9
60058203998.4
*C, n & d dimensions and masses for EN 1092-1 Type 04 PN 25.

DND
mm
K
mm
B'
mm
E
mm
109060313
159565353
2010575424
2511585494
32140100595
40150110675
50165125775
65185145966
802001601146
1002351901386
1252702201666
1503002501946
2003603102506
2504253703028
3004854303568
3505554904088
4006205504628
4506706005108
5007306605688
6008457706708
*D, K, B’, E dimensions for EN 1092-1 Type 04 PN 40.

DNC
mm
nd
mm
Mass
kg
10144140.549
15144140.606
20164140.836
25164140.990
32184181.65
40184181.85
50204182.47
65228183.04
80248183.61
100268225.18
125288266.89
150308268.69
20036123014.9
25042123323.8
30052163336.0
35058163650.4
40065163975.5
4502039
5002042
6002048
*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).

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