en-10253-1-reducer-form-2

All dimensions are in "mm" unless noted otherwise specified.
All weights are in "kg".

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Download the PDF fileEN-10253-1-butt-weld-fittings-2007

EN 10253-1 BUTT WELDING PIPE FITTINGS
ELBOW 2DELBOW 3DELBOW 5DREDUCER FORM 1REDUCER FORM 2
EQUAL TEESREDUCING TEESDISHED ENDSCAPSTolerance

1. Technical drawings for EN 10253-1 reducers of form 2

EN 10253-1 reducers

According to EN 10253-1, concentric reducers can be divided into form 1 and form 2. The first figure of above drawing is form 1 and the second one is form 2. The third figure is the technical drawing of eccentric reducer.

According to EN 10253-1, concentric reducers can be divided into form 1 and form 2. The first figure of above drawing is form 1 and the second one is form 2. The third figure is the technical drawing of eccentric reducer.

2. Dimensions of EN 10253-1 reducers of form 2

Side DSide D1Length
DNDTDND1T1L
2026.92.31521.32.038
2533.72.615
20
21.3
26.9
2.0
2.3
51
51
3242.42.615
20
25
21.3
26.9
33.7
2.0
2.3
2.6
51
51
51
4048.32.620
25
32
26.9
33.7
42.4
2.3
2.6
2.6
64
64
64
5060.32.925
32
40
33.7
42.4
48.3
2.6
2.6
2.6
 76
76
76
6576.12.932
40
50
42.4
48.3
60.3
2.6
2.6
2.9
89
89
89
8088.93.240
50
65
48.3
60.3
76.1
2.6
2.9
2.9
89
89
89
100114.33.650
60
80
60.3
76.1
88.9
2.9
2.9
3.2
102
102
102
125139.74.065
80
100
76.1
88.9
114.3
2.9
3.2
3.6
127
127
127
150168.34.580
100
125
88.9
114.3
139.7
3.2
3.6
4.0
140
140
140
200219.16.3100
125
150
114.3
139.7
168.3
3.6
4.0
4.5
152
152
152
250273.06.3125
150
200
139.7
168.3
219.1
4.0
4.5
6.3
178
178
178
300323.97.1150
200
250
168.3
219.1
273
4.5
6.3
6.3
203
203
203
350355.68.0200
250
300
219.1
273
323.9
6.3
6.3
7.1
330
330
330
400406.48.8250
300
350
273.1
323.9
355.6
6.3
7.1
8
356
356
356

*D: Outside diameter of large end of the reducer. T: Wall thickness of the large end.
*D1: Outside diameter of small end of the reducer. T1: Wall thickness of the small end.
*L: Face to face length of reducers.

 *All dimensions are in mm unless otherwise specified.

1. Tolerances on dimension according to EN 10253-1

1) All diameters of EN 10253-1 pipe fittings shall be measured at the welding ends of the fittings. The tolerance is ±1% or ±0.5 mm whichever is the greater.

2) In order to ensure the flow-way area through the fitting is not excessively reduced, the internal diameter(not applicable to dished ends and caps) shall be greater than 80% of the theoretical internal diameter(ID), as calculated by: ID = OD - 2T.

3) Tolerances for ovality are:

at the welding ends: 2%;

on the body for elbows and return bends: 4%.

The ovality(Ov) shall be calculated by:

Ov = 200 * (Dmax - Dmin) / (Dmax + Dmin) in %.

Dmax: maximum measured diameter in one section.

Dmin: minimum measured diameter in one section.

4) Wall thickness tolerances

DTTolerance
mmmmminusplus
≤406.4≤4
>4
-12.50%0.35

 *D: Outside diameter at the welding end. T: Wall thickness.

 *The minus tolerance also applies to the body of the fitting.

5) Tolerances on specific dimensions

DF-G-HBCKL
≤114.3±2±7±7±4±2
114.3<D≤219.1±2±7±7±7±3
219.1<D≤406.4±3±7±10±7±5

 *D: outside diameter;

 *F: distance from the axis of the center line to the face of the branch outlet of equal tee.

 *G: distance from the axis of the center line to the face of the branch outlet of reducing tee.

 *H: Face to center-line distance for 45°.

 *B: Face to top distance for 180° return bends.

 *C: Center to center distance for 180° return bends.

 *K: height of dished ends or caps.

 *L: Face to face length of reducers(both concentric & eccentric).

6) Tolerances on the form of fittings

The tolerance on the form of each type of fitting Q = 1% of the outside diameter(D) or 1 mm, whichever is greater. See the figure illustrated below.

2. End finish of EN 10253-1 butt welding pipe fittings

According to DIN EN 10253-1,
for wall thickness T < 3.0 mm, the ends may be plain or slightly chamfered.
for wall thickness T ≥ 3.0 mm, the ends shall be bevelled with an angle of 30 degrees to 35 degrees with a face of 1.6 mm ± 0.8 mm.
The welding ends of EN 10253-1 pipe fittings shall be free from harmful blurs.
Specially, the ends of dished ends with diameter ≥ 159 mm shall be bevelled with an angle of  30 degrees to 35 degrees with a face of 1.6 mm ± 0.8 mm.