钢对焊管件 降低压力系数的偏心异径管

Steel butt-welding pipe fittings
Eccentric reducers with reduced pressure factor

Formstücke zum Einschweißen; Reduzierstücke;
verminderter Ausnutzungsgrad

This standard, together with
February 1991 edition of DIN 2616 Part 2,
supersedes June 1964 edition of DIN 2616.

In keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has been used throughout as the decimal marker.

Dimensions in mm

1 Field of application

This standard specifies seamless and welded eccentric steel reducers that are intended to be butt welded to pipes. Although the wall thicknesses specified correspond to those of the pipes, these reducers do not permit operation at the same internal pressure as the pipe welded to the larger end of the reducer, i.e. they have a reduced pressure factor (cf. table 2 and clause 4). See DIN 2616 Part 2 for specifications regarding concentric reducers.

2 Dimensions and designation

Detail X

Detail Y

Dimensions a, l₂ and l₃ are to be calculated from the following formulae.

a = (d₁ − d₂) / 2

l_{2 min} = 0,5 · d₁ · s₁

l_{3 min} = 0,5 · d₂ · s₂

Figure 1. Eccentric reducer

Designation of a seamless (S), eccentric (E) reducer in accordance with this standard (1), where d₁ is equal to 114,3 mm, s₁ is equal to 3,6 mm, d₂ is equal to 60,3 mm and s₂ is equal to 2,9 mm, made from material belonging to material group G as in DIN 2609 (G):

Reducer DIN 2616 − 1 − E − 114,3 × 3,6 − 60,3 × 2,9 S − G

Continued on pages 2 to 7

1

Table 2 - Dimensions and pressure factor as a function of size

A dash in a box indicates a size that has not been standardized.

2

Table 2 (continued).

A dash in a box indicates a size that has not been standardized.

3

Table 2 (continued).

4

Table 2 (continued).

5

Table 2 (concluded)

A dash in a box indicates a size that has not been standardized.

6