API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology

5-84 API RECOMMENDED PRACTICE 581
Table 6.4—Design Margins for Various Codes of Construction
Construction Code
Design Margin
ASME Section VIII, Div. 1, pre-1950 5.0
ASME Section VIII, Div. 1, 1950–1998 4.0
ASME Section VIII, Div. 1, 1999 and later 3.5
ASME Section VIII, Div. 2, pre-2007 3.0
ASME Section VIII, Div. 2, 2007 and later 2.4
ASME B31.3 3.0
AS 1210 3.5
NOTE For any construction code not listed in this table or when design by analysis was
utilized to design the equipment, it is the responsibility of the owner–user to determine
the design margin.