30 C.F.R. § 250.519
What are the requirements for casing pressure management?
Once you install your wellhead, you must meet the casing pressure management requirements of API Recommended Practice 90 (incorporated by reference, see § 250.198) and the requirements of §§ 250.519 through 250.531. If there is a conflict between API Recommended Practice 90 and the casing pressure requirements of this subpart, you must follow the requirements of this subpart.