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

RISK-BASED INSPECTION METHODOLOGY, PART 2—PROBABILITY OF FAILURE METHODOLOGY 2-151
22.9 Tables
Table 22.1—Data Required for Determination of the DF—885 °F Embrittlement
Required Data
Administrative controls for upset
management (Yes/No)
Minimum operating temperature
under normal, start-up/shutdown, or
upset conditions, °C (°F)
T ref , °C (°F)
Comments
Are there controls and or awareness training to prevent the coincident
occurrence of low temperatures (upset) at or near design pressures?
This may be the temperature below which the operating pressure is reduced for
purposes of fracture control. If not entered, the temperature will be set to the
atmospheric boiling point of the fluid in the component if the fluid is a liquid.
The original transition temperature.
Table 22.2—Materials Affected by 885 °F Embrittlement
AISI Designation
% Chromium
Type 405 11.5 to 14.5
Type 430 16 to 18
Type 430F 16 to 18
Type 442 18 to 23
Type 446 23 to 27
Table 22.3—DF—885 °F Embrittlement
T min − T ref
°C °F
DF
>56 >100 0
56 100 2
44 80 8
33 60 30
22 40 87
11 20 200
−0 0 371
−11 −20 581
−22 −40 806
−33 −60 1022
−44 −80 1216
−56 −100 1381