---
kind: "section"
citation: "49 C.F.R. § 193.2905"
title: "49"
number: "193.2905"
heading: "Protective enclosures."
url: "https://uscodex.org/cfr/49/193.2905"
---

# §193.2905. Protective enclosures.

- (a) The following facilities must be surrounded by a protective enclosure:
  - (1) Storage tanks;
  - (2) Impounding systems;
  - (3) Vapor barriers;
  - (4) Cargo transfer systems;
  - (5) Process, liquefaction, and vaporization equipment;
  - (6) Control rooms and stations;
  - (7) Control systems;
  - (8) Fire control equipment;
  - (9) Security communications systems; and
  - (10) **Alternative power sources.**
- (b) Ground elevations outside a protective enclosure must be graded in a manner that does not impair the effectiveness of the enclosure.
- (c) Protective enclosures may not be located near features outside of the facility, such as trees, poles, or buildings, which could be used to breach the security.
- (d) At least two accesses must be provided in each protective enclosure and be located to minimize the escape distance in the event of emergency.
- (e) Each access must be locked unless it is continuously guarded. During normal operations, an access may be unlocked only by persons designated in writing by the operator. During an emergency, a means must be readily available to all facility personnel within the protective enclosure to open each access.

## Notes

### Source

Source: Amdt. 193-2, 45 FR 70409, Oct. 23, 1980, unless otherwise noted.

### Authority

Authority: 49 U.S.C. 5103, 60102, 60103, 60104, 60108, 60109, 60110, 60113, 60118; and 49 CFR 1.53.

### Source

Source: 45 FR 9203, Feb. 11, 1980, unless otherwise noted.