BSR GPTC Z380.1-2018 TR 2017-15-202X - TR 2017-15 – GM – Deactivation of Threats __________________________________________________________________________________________________

Section 192.917(b) requires that the operator comply with the IBR edition of ASME B31.8S, Appendix A even though Appendix A is titled as "nonmandatory." See 3.2 of the guide material under §192.907. [...] BSR GPTC Z380.1-2018 TR 2017-15-202X TR 2017-15 – GM – Deactivation of Threats Page 5 of 7 __________________________________________________________________________________________________ (2) A threat might become inactive over time due to pipeline replacement programs, the implementation of ef fective preventative actions, or other improvements to systems. [...] The operator is only required to dig and directly examine within a covered segment (§192.927(c)(3)), the location of which can be found by the following. [...] (e) If the ICDA region ends before the start of the covered segment (pipeline inclination angle that exceeds critical angle is upstream of covered segment), the first two steps of the ICDA process can be used as a threat screening tool. [...] Since the covered segment is downstream of a critical angle, electrolytes will not reach the covered segment and internal corrosion is not a threat to the covered segment.