Hot Spot - EN 12516 Series of Shell Design Strength Standards

Published: 16th October 2013 | Issue 26 Share article:

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b) B designation rating have been replaced by the PN designation;

c) B20 rating values have been replaced by Class150 and use the calculation method given in ASME B16-34;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.

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