- The flange height shall be not more than 3,5t. Above 50mm please see table below.
Flange edges (h1 preapairin for welding)
The flange edges shall be made by machining or by flame cutting. Dimensions c,f and x shall be agreed at the time of ordering, as should be angles. Ad other type of beveling edges shall be subject to agreement, based on drawings, at the time of ordering.
Deisgnation of a torospherical dished end made of HII stell as in DIN 17 155 with an outside diameter OD od 600mm and a Wall thickness t of 20 mm, with type VA flange edge:
Dished End DIN 28 011 – 600X20-VA – HII
Designation of a torospherical dished end made of HII steel as in DIN 17 155 with an outside diameter OD od 600mm and a minimum Wall thickness tmin of 18,5 mm, with type BI flange edge tapered inside x=15mm: Dished End DIN 28 011 – 600x18,5 MIN-VA BI – 15 HII
Technical delivery conditions
Subject to agreement, the ends shall be made of the following materials;
a) Hot rolled unalloyed structural steel as in DIN EN 10 025
b) Steel sheet and strip with elevated temprature properties as in DIN 17 155
c) Stainless steel as in DIN 17 440 or in Stahl-Eisen-Werstofflatt (iron and steel materials sheet) 400
d) Fine grained structural steel suitable for welding as in DIN 17 102
e) Low – temperature steel
f) Clad steel
g) High – temperature and heat resisting steels
h) Special alloys
i) Nonferrous metals
j) Materials as in other national and international specifications.
Manufacture and heat treatment
Ends may either be cold or hot formed, unless a specific type of forming has been explicitly agreed.
Heat treatment shall be subject to agreement (e.g. as specified in the AD – Merkblatter of series HP 7). If an end has been but together from a number of parts (either before forming), this shall be stated by the manufacturer.
Ends shall be supplied with untreated surfaces. Any specific finish (e.q. descaled, pickled, blasted) shall be subject to agreement.
Limit deviations for height H
The limit deviations for height h=h1+h2 shall be + 0,015D or + 10 mm (whichever is higher) and 0.
These deviations are valid for ends with machined flange edges. Ends with unfinished flange edges (Type R) shall be designed so that they can be used to manufacture other types specified in this standard.
Limit deviations for circumference
The Limit deviations for circumference shall be as specified in table 2.
The largest difference in diameter, Dmax – Dmin for D up to 4000mm shall not be greater than 30 mm
Where required, closer tolerances fort the circumference or out-of-roundness may be agreed. If ends are to be used in pairs or as inner or outer ends, the limit deviations shall be subject to agreement.
Determining the circumference
Point of measurement
In the case of ends with machined flange edges, the circumferece shall be measured along the edge. In the case of ends with ufinished edges, the circumference shall be measured in the zone defined by the upper and lower limit deviation for H as specified in “Limit deviations for height H” part. Determining the external circumference
The circumference shall be measured at the point specified “Point of measurement” part, using gauged measuring tape as in DIN 6403. When calculating the diameter, p shall be taken to be 3,14159
Determinig the internal circumference (if agreed)
The internal circumference shall either be determined by measuring the external as described in “Determining the external circumference” part. and deducting the mean Wall thickness (i.e. the arithmetical mean of at least three measurements taken along line used when measuring the circumference). Where D exceeds 500mm, the Wall thickness shall be measured at intervals of 500 or determined by using a gauged measuring tape. Flattening
In the zone of radius r, flattening of the curvature shall be permitted in lengths of maximum 15% of r.
Permissible deflection of flange
In the zone of Radius r, flattening of the curvature shall be permitted in lengths of maximum 15% of r.
See table 4 for the permissible angles of deflection, and