en-10253-1-reducing-tee

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 drawing of EN 10253-1 reducing tees

EN 10253-1 equal tees

2. Dimensions of EN 10253-1 reducing tees

Side DSide D1
DNDTDND1T1FG
2533.72.615
20
25
21.3
26.9
33.7
2.0
2.3
2.6
3838
38
38
4048.32.615
20
25
32
21.3
26.9
33.7
42.4
2.0
2.3
2.6
2.6
5757
57
57
57
5060.32.920
25
32
40
26.9
33.7
42.4
48.3
2.3
2.6
2.6
2.6
6444
51
57
60
6576.12.925
32
40
50
33.7
42.4
48.3
60.3
2.6
2.6
2.6
2.9
7657
64
67
70
8088.93.225
32
40
50
65
33.7
42.4
48.3
60.3
76.1
2.6
2.6
2.6
2.9
2.9
8667
70
79
76
83
100114.33.640
50
60
80
48.3
60.3
76.1
88.9
2.6
2.9
2.9
3.2
10586
89
95
98
125139.74.050
65
80
100
60.3
76.1
88.9
114.3
2.9
2.9
3.2
3.6
124105
108
111
117
150168.34.550
65
80
100
125
60.3
76.1
88.9
114.3
139.7
2.9
2.9
3.2
3.6
4.0
143117
121
124
130
137
200219.16.380
100
125
150
88.9
114.3
139.7
168.3
3.2
3.6
4.0
4.5
178152
156
162
168
250273.06.3100
125
150
200
114.3
139.7
168.3
219.1
3.6
4.0
4.5
6.3
216184
191
194
203
300323.97.1150
200
250
168.3
219.1
273
4.5
6.3
6.3
254219
229
241
350355.68.0150
200
250
300
168.3
219.1
273
323.9
4.5
6.3
6.3
7.1
279238
248
257
270
400406.48.8150
200
250
300
350
168.3
219.1
273.1
323.9
355.6
4.5
6.3
6.3
7.1
8
305264
273
283
295
305

 *D: Outside diameter of main outlet of reducing tees.
*D1: Outside diameter of branch outlet of reducing tees.
*T: Wall thickness of the main outlet; T1: Wall thickness of the branch outlet.

 *F: Face to center length of reducing tees.

 *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.