Understanding API ICP653 Reading 14-Worksheet-10A

4.2 Plates
4.2.1 General
4.2.1.1 Except as otherwise provided for in 4.1, plates shall conform to one of
the specifications listed in 4.2.2 through 4.2.6, subject to the modifications
and limitations in this standard.
4.2.1.2 Plate for shells, roofs, and bottoms may be ordered on an edgethickness
basis or on a weight (kg/m 2 [lb/ft 2 ]) basis, as specified in 4.2.1.2.1,
4.2.1.2.2, and 4.2.1.2.3.
4.2.1.2.1 The edge thickness ordered shall not be less than the computed
design thickness or the minimum permitted thickness.
4.2.1.2.2 The weight ordered shall be great enough to provide an edge
thickness not less than the computed design thickness or the minimum
permitted thickness.
4.2.1.2.3 Whether an edge-thickness or a weight basis is used, an underrun
not more than 0.3 mm (0.01 in.) from the computed design thickness or the
minimum permitted thickness is acceptable.
Charlie Chong/ Fion Zhang