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BRIDAS EN 1092-1 - ANNEX A. Wall thickness and end preparation
A.1 Weld-end preparation for flanges types 11 and 34
Unless otherwise specified, for flanges in accordance with this European Standard the welding end connections given in
Figures A.1 to A.3 shall be used. Additional types of welding ends are specified in EN ISO 9692-2 and example of designs
in EN 1708-1 and may be used by agreement between the component or pressure equipment manufacturer and the flange
manufacturer.
— Wall thickness S <= 3mm: Flanges/collars may be delivered with square cut ends.
— Wall thickness 3 < S < 22: Bevelled ends with an angle of 30º + 5º -0º and root face of (1,6 ± 0,8) mm.
— If flange wall thickness (S) > pipe wall thickness (T), the inner diameter shall be chamfered with an angle of 15º +5º -0º to
match (see Figure A.3)