11.1.5.2 Lamellar Tearing Resistance of Plate
Critical structural elements fabricated from steel plate that transfer loads through the thickness or the short transverse
dimension of the plate shall be ultrasonically inspected in accordance with ASTM A578/A578M, Acceptance Standard
Level B. They shall be tested for resistance to lamellar tearing in accordance with the procedures and requirements of
API 2H, Supplementary Requirement S-4, or ASTM A770/A770M.
11.1.5.3 Additional Requirements for Castings
11.1.5.3.1 Prototype Castings
The validity of the casting procedure for all critical component castings shall be verified by conducting examinations
and tests on the first lot cast and each change in pattern design or pouring practice. Destructive testing and