###### Editorial Note on [Part 250](/current/title-30/part-250?toc=1)

#### Editorial Note:

Nomenclature changes to part 250 appear at [77 FR 50891](https://www.federalregister.gov/citation/77-FR-50891), Aug. 22, 2012.

#### § 250.734 What are the requirements for a subsea BOP system?

(a) When you drill or conduct operations with a subsea BOP system, you must install the BOP system before drilling to deepen the well below the surface casing or before conducting operations if the well is already deepened beyond the surface casing point. The District Manager may require you to install a subsea BOP system before drilling or conducting operations below the conductor casing if proposed casing setting depths or local geology indicate the need. The following table outlines your requirements.

| When operating with a subsea BOP system, you must: | Additional requirements: |
| --- | --- |
| (1) Have at least five remote-controlled, hydraulically operated BOPs; | You must have at least one annular BOP, two BOPs equipped with pipe rams, and two BOPs equipped with shear rams. For the dual ram requirement, you must comply with this requirement no later than April 29, 2021. |
| | (i) Both BOPs equipped with pipe rams must be capable of closing and sealing on the tubular body of any drill pipe, workstring, and tubing under MASP, as defined for the operation, except tubing with exterior control lines and flat packs, a bottom hole assembly that includes heavy-weight pipe or collars, and bottom-hole tools. |
| | (ii) Both shear rams must be capable of shearing at any point along the tubular body of any drill pipe (excluding tool joints, bottom-hole tools, and bottom hole assemblies such as heavy-weight pipe or collars), workstring, tubing and associated exterior control lines, appropriate area for the liner or casing landing string, shear sub on subsea test tree, and any electric-, wire-, slick-line in the hole; under MASP. At least one shear ram must be capable of sealing the wellbore after shearing under MASP conditions as defined for the operation. Any non-sealing shear ram(s) must be installed below a sealing shear ram(s). |
| (2) Have an operable redundant pod control system to ensure proper and independent operation of the BOP system; | |
| (3) Have the accumulator capacity, to provide fast closure of the BOP components and to operate all critical functions; | The accumulator capacity must: (i) Close each required shear ram, ram locks, one pipe ram, and disconnect the LMRP. (ii) Have the capability to perform ROV functions within the required times outlined in API Standard 53 with ROV or flying leads. (iii) Have bottles located subsea for the autoshear and deadman (which may be shared between those two systems) to secure the wellbore. These bottles may also be utilized to perform the secondary control system functions (e.g., ROV or acoustic functions). (iv) Perform under MASP conditions as defined for the operation. |
| (4) Have a subsea BOP stack equipped with remotely operated vehicle (ROV) intervention capability | You must have the ROV intervention capability to open and close each shear ram, ram locks, one pipe ram, and disconnect the lower marine riser package (LMRP) under MASP conditions as defined for the operation. You must be capable of performing these functions in the response times outlined in API Standard 53 (as incorporated by reference in [§ 250.198](/on/2024-09-16/title-30/section-250.198)). The ROV panels on the BOP and LMRP must be compliant with API RP 17H (as incorporated by reference in [§ 250.198](/on/2024-09-16/title-30/section-250.198)). |
| (5) Maintain an ROV and have a trained ROV crew on each rig unit on a continuous basis once BOP deployment has been initiated from the rig until recovered to the surface. The ROV crew must examine all ROV-related well-control equipment (both surface and subsea) to ensure that it is properly maintained and capable of carrying out appropriate tasks during emergency operations; | The crew must be trained in the operation of the ROV. The training must include simulator training on stabbing into an ROV intervention panel on a subsea BOP stack. The ROV crew must be in communication with designated rig personnel who are knowledgeable about the BOP's capabilities. |
| (6) Provide autoshear, deadman, and EDS systems for dynamically positioned rigs; provide autoshear and deadman systems for moored rigs; | (i) Autoshear system means a safety system that is designed to automatically shut-in the wellbore in the event of a disconnect of the LMRP. This is considered a rapid discharge system. |
| | (ii) Deadman system means a safety system that is designed to automatically shut-in the wellbore in the event of a simultaneous absence of hydraulic supply and signal transmission capacity in both subsea control pods. This is considered a rapid discharge system. |
| | (iii) Emergency Disconnect Sequence (EDS) system means a safety system that is designed to be manually activated to shut-in the wellbore and disconnect the LMRP in the event of an emergency situation. This is considered a rapid discharge system. |
| | (iv) Autoshear/deadman functions and an EDS mode must close, at a minimum, two shear rams in sequence and be capable of performing their expected shearing and sealing action under MASP conditions as defined for the operation. |
| | (v) Your sequencing must allow a sufficient delay when closing your two shear rams in order to provide maximum sealing efficiency. |
| (7) Demonstrate that any acoustic control system will function in the proposed environment and conditions; | If you choose to use an acoustic control system in addition to the autoshear, deadman, and EDS requirements, you must demonstrate to the District Manager, as part of the information submitted under [§ 250.731](/on/2024-09-16/title-30/section-250.731), that the acoustic control system will function in the proposed environment and conditions. The District Manager may require additional information as appropriate to clarify or evaluate the acoustic control system information provided in your demonstration. |
| (8) Have operational or physical barrier(s) on BOP control panels to prevent accidental disconnect functions; | You must incorporate enable buttons, or a similar feature, on control panels to ensure two-handed operation for all critical functions. |
| (9) Clearly label all control panels for the subsea BOP system; | Label other BOP control panels, such as hydraulic control panel. |
| (10) Develop and use a management system for operating the BOP system, including the prevention of accidental or unplanned disconnects of the system; | The management system must include written procedures for operating the BOP stack and LMRP (including proper techniques to prevent accidental disconnection of these components) and minimum knowledge requirements for personnel authorized to operate and maintain BOP components. |
| (11) Establish minimum requirements for personnel authorized to operate critical BOP equipment; | Personnel must have: (i) Training in deepwater well-control theory and practice according to the requirements of Subparts O and S; and (ii) A comprehensive knowledge of BOP hardware and control systems. |
| (12) Before removing the marine riser, displace the fluid in the riser with seawater; | You must maintain sufficient hydrostatic pressure or take other suitable precautions to compensate for the reduction in pressure and to maintain a safe and controlled well condition. You must follow the requirements of [§ 250.720(b)](/on/2024-09-16/title-30/section-250.720#p-250.720(b)). |
| (13) Install the BOP stack in a well cellar when in an ice-scour area; | Your well cellar must be deep enough to ensure that the top of the stack is below the deepest probable ice-scour depth. |
| (14) Install at least two side outlets for a choke line and two side outlets for a kill line; | (i) If your stack does not have side outlets, you must install a drilling spool with side outlets. (ii) Each side outlet must have two full-bore, full-opening valves. (iii) The valves must hold pressure from both directions and must be remote-controlled. iv) You must install a side outlet below the lowest sealing shear ram. You may have a pipe ram or rams between the shearing ram and side outlet. |
| (15) Install a gas bleed line with two valves for the annular preventer no later than April 30, 2018; | (i) The valves must hold pressure from both directions; (ii) If you have dual annulars, you must install the gas bleed line below the upper annular. |
| (16) Use a BOP system that has the following mechanisms and capabilities; | (i) No later than May 1, 2023, you must have the capability to position the entire pipe completely within the area of the shearing blade. This capability cannot be a separate ram BOP or annular preventer, but you may use those during a planned shear. (ii) If your control pods contain a subsea electronic module with batteries, a mechanism for personnel on the rig to monitor the state of charge of the subsea electronic module batteries in the BOP control pods. |

(b) If you suspend operations to make repairs to any part of the subsea BOP system, you must stop operations at a safe downhole location. Before resuming operations you must:

(1) Submit a revised permit with a written statement from an independent third party documenting the repairs and certifying that the previous certification in [§ 250.731(c)](/on/2024-09-16/title-30/section-250.731#p-250.731(c)) remains valid;

(2) Upon relatch of the BOP, perform an initial subsea BOP test in accordance with [§ 250.737(d)(4)](/on/2024-09-16/title-30/section-250.737#p-250.737(d)(4)), including deadman in accordance with [§ 250.737(d)(12)(vi)](/on/2024-09-16/title-30/section-250.737#p-250.737(d)(12)(vi)). If repairs take longer than 30 days, once the BOP is on deck, you must test in accordance with the requirements of [§ 250.737](/on/2024-09-16/title-30/section-250.737);

(3) Upon relatch of the LMRP, you must test according to the following:

(i) Pressure test riser connector/gasket in accordance with [§ 250.737(b)](/on/2024-09-16/title-30/section-250.737#p-250.737(b)) and [(c)](/on/2024-09-16/title-30/section-250.737#p-250.737(c));

(ii) Pressure test choke and kill stabs at LMRP/BOP interface in accordance with [§ 250.737(b)](/on/2024-09-16/title-30/section-250.737#p-250.737(b)) and [(c)](/on/2024-09-16/title-30/section-250.737#p-250.737(c));

(iii) Full function test of both pods and both control panels;

(iv) Verify acoustic pod communication (if equipped); and

(v) Deadman test with pressure test in accordance with [§ 250.737(d)(12)(vi)](/on/2024-09-16/title-30/section-250.737#p-250.737(d)(12)(vi)).

(4) Receive approval from the District Manager.

(c) If you plan to drill a new well with a subsea BOP, you do not need to submit with your APD the verifications required by this subpart for the open water drilling operation. Before drilling out the surface casing, you must submit for approval a revised APD, including the verifications required in this subpart.

[[81 FR 26022](https://www.federalregister.gov/citation/81-FR-26022), Apr. 29, 2016, as amended at [84 FR 21980](https://www.federalregister.gov/citation/84-FR-21980), May 15, 2019; [88 FR 57408](https://www.federalregister.gov/citation/88-FR-57408), Aug. 23, 2023]