Section 192.923 - How is direct assessment used and for what threats?(a)General. An operator may use direct assessment either as a primary assessment method or as a supplement to the other assessment methods allowed under this subpart. An operator may only use direct assessment as the primary assessment method to address the identified threats of external corrosion (EC), internal corrosion (IC), and stress corrosion cracking (SCC).(b)Primary method. An operator using direct assessment as a primary assessment method must have a plan that complies with the requirements in- (1) Section 192.925 and ASME B31.8S (incorporated by reference, see §192.7) Section 6.4, and NACE SP0502 (incorporated by reference, see§192.7), if addressing external corrosion (EC).(2) Section 192.927 and ASME/ANSI B31.8S (incorporated by reference, see§192.7), section 6.4, appendix B2, if addressing internal corrosion (IC).(3) Section 192.929 and ASME/ANSI B31.8S (incorporated by reference, see§192.7), appendix A3, if addressing stress corrosion cracking (SCC).(c)Supplemental method. An operator using direct assessment as a supplemental assessment method for any applicable threat must have a plan that follows the requirements for confirmatory direct assessment in §192.931. 68 FR 69817 , Dec. 15, 2003, as amended by Amdt. 192-114, 75 FR 48604 , Aug. 11, 2010; Amdt. 192-119, 80 FR 178 , 182, Jan. 5, 2015; 80 FR 46847 , Aug. 6, 2015; Amdt. 192-132, 87 FR 52274 , Aug. 24, 2022 87 FR 52274 , 5/24/2023; 89 FR 33282 , 6/28/2024