30 CFR § 250.521 - When do I have to perform a casing diagnostic test?
---
identifier: "/us/cfr/t30/s250.521"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "30 CFR § 250.521 - When do I have to perform a casing diagnostic test?"
title_number: 30
title_name: "Mineral Resources"
section_number: "250.521"
section_name: "When do I have to perform a casing diagnostic test?"
chapter_name: "BUREAU OF SAFETY AND ENVIRONMENTAL ENFORCEMENT, DEPARTMENT OF THE INTERIOR"
subchapter_number: "B"
subchapter_name: "OFFSHORE"
part_number: "250"
part_name: "OIL AND GAS AND SULPHUR OPERATIONS IN THE OUTER CONTINENTAL SHELF"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "30 U.S.C. 1751, 31 U.S.C. 9701, 33 U.S.C. 1321(j)(1)(C), 43 U.S.C. 1334."
regulatory_source: "76 FR 64462, Oct. 18, 2011, unless otherwise noted."
cfr_part: "250"
---
# 250.521 When do I have to perform a casing diagnostic test?
(a) You must perform a casing diagnostic test within 30 days after first observing or imposing casing pressure according to the following table:
| If you have a . . . | you must perform a casing diagnostic test if . . . |
| --- | --- |
| (1) fixed platform well, | the casing pressure is greater than 100 psig. |
| (2) subsea well, | the measurable casing pressure is greater than the external hydrostatic pressure plus 100 psig measured at the subsea wellhead. |
| (3) hybrid well, | a riser or the production casing pressure is greater than 100 psig measured at the surface. |
(b) You are exempt from performing a diagnostic pressure test for the production casing on a well operating under active gas lift.
[76 FR 64462, Oct. 18, 2011. Redesignated at 77 FR 50894, Aug. 22, 2012]