Hot Spot - EN 12516 Series of Shell Design Strength Standards
Several parts of the EN 12516 series of standards have recently under gone formal vote. These include:-
• Part 1: Tabulation method for steel valve shells
• Part 2: Calculation method for steel valve shells
• Part 4: Calculation method for valve shells manufactured in metallic materials other than steel
Changes to Part 1
The main changes to Part 1 with respect to the previous edition are listed below:
a) Addition of new PN values PN 160, PN 250, PN 320, PN 400;
b) B designation rating have been replaced by the PN designation;
c) B20 rating values have been replaced by Class150 and use the calculation method given in ASME B16-34;
d) New PN values have been added to Table 7 for the Valve body minimum wall thickness values;
e) Material tables have been updated to be in line with EN 1092-1 for the EN materials;
f) Materials 1.0345 and 1.4458 have been deleted;
g) Annex B material groups has been updated and made normative;
h) Special Class in EN material have been moved to an informative Annex C;
i) EN materials properties for pressure temperature calculation have been modified (Rm/3,5) to be consistent with the new ASME rules, and using Rp1% for Stainless Steel consistent with EN 12516-2;
j) ASTM Material properties used for rating calculation have been updated to the new ASME B16- 34 rules.
Changes to Part 4
The main changes compared to the previous 2008 edition are:
a) Normative references have been updated;
b) Clause 4 has been revised;
c) Additional ductile iron materials where added to Table 2;
d) 5.2.2 has been revised;
e) Safety factors in Table 15 have been corrected to be in line with other practicable standards;
f) Annex ZA has been revised.
Published: 16th October 2013
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