Butt-Weld Fittings / Clamps - RO-FI Edelstahl

Butt-Weld Fittings
Curved heads DIN 28011/cap form
measure in mm
1 Coverage
This norm is to use for curved heads in cap form (bumped
boiler heads) with following connections:
r 1 =d a r 2 =0,1d a h 1 ≥ 3,5 s 1) h 2 =0,1935d a -0,455s
This norm consider for one piece heads with and without
weld seam with a external diameter da=>4000 mm and
a wall thickness s =< 50 mm.
#For heads in larger dimensional range consider analogously
the Scope of this norm, at which the tolerance -
especially at heads of sections- have to arrange extra.
Curved heads, elliptical head see DIN 28013.
The calculation of the necessary wall thickness results for
example:
- for pressure tanks according to the technical rules of
pressure tanks (TRB, AD-leaflets)
- for steam boilers according to the technical rules of
steam boilers (TRD)
2 Type of design, description
2.1 Geometrical connections
11.2007_1.000
curved part
picture 1
s = wall thickness, see Section 3.4.5
Capacity of the curved part (without boarding height h1) V ≈ 0,1 (d a - 2s) 3
2
External surface of the curved part (without boarding height h1) A a ≈ 0,99 • d a
Internal surface of the curved part (without boarding height h1) A i ≈ 0,99 • (d a - 2s) 2
Reference line will be measured out of the finished kerb with h1 according to table 1
At the order the designation of the reference line can be arrange.
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RO-FI Precision in Stainless Steel