Code of Federal Regulations Title 30. Mineral Resources § 30.250.839 What are the maximum allowable valve closure times and hydraulic bleeding requirements for a direct-hydraulic control system?

(1) Process upset.

Close within 45 seconds after sensor activation.

[no requirements]

[no requirements].

[no requirements].

[no requirements]

(2) Flowline PSHL.

Close within 45 seconds after sensor activation.

Close one or more valves within 2 minutes and 45 seconds after sensor activation. Close the designated USV1 within 20 minutes after sensor activation.

Close within 24 hours after sensor activation.

Complete bleed of USV1, USV2, and the AIV within 20 minutes after sensor activation.

Complete bleed within 24 hours after sensor activation.

(3) ESD/TSE (Platform).

Close within 45 seconds after ESD or sensor activation.

Close all valves within 20 minutes after ESD or sensor activation.

Close within 60 minutes after ESD or sensor activation.

Complete bleed of USV1, USV2, and the AIV within 20 minutes after ESD or sensor activation.

Complete bleed within 60 minutes after ESD or sensor activation.

(4) Subsea ESD (Platform) or BSDV TSE.

Close within 45 seconds after ESD or sensor activation.

Close one or more valves within 2 minutes and 45 seconds after ESD or sensor activation. Close all tree valves within 10 minutes after ESD or sensor activation.

Close within 10 minutes after ESD or sensor activation.

Complete bleed of USV1, USV2, and the AIV within 10 minutes after ESD or sensor activation.

Complete bleed within 10 minutes after ESD or sensor activation.

(5) Subsea ESD (MODU or other type of workover vessel), Dropped object.

[no requirements].

Initiate closure immediately. If desired, you may allow for closure of the tree valves immediately prior to closure of the surface-controlled SSSV.

Initiate unrestricted bleed immediately.

Initiate unrestricted bleed immediately.