---
kind: "section"
citation: "30 C.F.R. § 250.735"
title: "30"
number: "250.735"
heading: "What associated systems and related equipment must all BOP systems include?"
url: "https://uscodex.org/cfr/30/250.735"
---

# §250.735. What associated systems and related equipment must all BOP systems include?


All BOP systems must include the following associated systems and related equipment:

- (a) An accumulator system, as specified in API Standard 53 (incorporated by reference, see [§ 250.198](/cfr/30/250.198.md)). Your accumulator system must have the fluid volume capacity and appropriate pre-charge pressures in accordance with API Standard 53. If you supply the accumulator regulators by rig air and do not have a secondary source of pneumatic supply, you must equip the regulators with manual overrides or other devices to ensure capability of hydraulic operations if rig air is lost;
- (b) **An automatic backup to the primary accumulator-charging system.** The power source must be independent from the power source for the primary accumulator-charging system. The independent power source must possess sufficient capability to close and hold closed all BOP components under MASP conditions as defined for the operation;
- (c) **At least two full BOP control stations.** One station must be on the rig floor. You must locate the other station in a readily accessible location away from the rig floor;
- (d) The choke line(s) installed above the bottom well-control ram;
- (e) The kill line must be installed beneath at least one well-control ram, and may be installed below the bottom ram;
- (f) A fill-up line above the uppermost BOP;
- (g) Locking devices for all BOP sealing rams (i.e., blind shear rams, pipe rams and variable bore rams), as follows:
  - (1) For subsea BOPs, hydraulic locking devices must be installed on all sealing rams;
  - (2) **For surface BOPs—**
    - (i) Remotely-operated locking devices must be installed on blind shear rams no later than April 29, 2019;
    - (ii) Manual or remotely-operated locking devices must be installed on pipe rams and variable bore rams; and
- (h) **A wellhead assembly with a RWP that exceeds the maximum anticipated wellhead pressure.**

## Notes

### Amendments

[81 FR 26022, Apr. 29, 2016, as amended at 84 FR 21981, May 15, 2019; 91 FR 35352, June 10, 2026]

### Source

Source: 81 FR 26022, Apr. 29, 2016, unless otherwise noted.

### Authority

Authority: 30 U.S.C. 1751, 31 U.S.C. 9701, 33 U.S.C. 1321(j)(1)(C), 43 U.S.C. 1334.

### Source

Source: 76 FR 64462, Oct. 18, 2011, unless otherwise noted.

### Amendments

[81 FR 26022, Apr. 29, 2016, as amended at 84 FR 21981, May 15, 2019; 91 FR 35352, June 10, 2026]