---
kind: "section"
citation: "30 C.F.R. § 250.431"
title: "30"
number: "250.431"
heading: "What are the diverter design and installation requirements?"
url: "https://uscodex.org/cfr/30/250.431"
---

# §250.431. What are the diverter design and installation requirements?


You must design and install your diverter system to:

- (a) Use diverter spool outlets and diverter lines that have a nominal diameter of at least 10 inches for surface wellhead configurations and at least 12 inches for floating drilling operations;
- (b) Use dual diverter lines arranged to provide for downwind diversion capability;
- (c) **Use at least two diverter control stations.** One station must be on the drilling floor. The other station must be in a readily accessible location away from the drilling floor;
- (d) **Use only remote-controlled valves in the diverter lines.** All valves in the diverter system must be full-opening. You may not install manual or butterfly valves in any part of the diverter system;
- (e) Minimize the number of turns (only one 90-degree turn allowed for each line for bottom-founded drilling units) in the diverter lines, maximize the radius of curvature of turns, and target all right angles and sharp turns;
- (f) Anchor and support the entire diverter system to prevent whipping and vibration; and
- (g) **Protect all diverter-control instruments and lines from possible damage by thrown or falling objects.**

## Notes

### 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.