---
kind: "section"
citation: "30 C.F.R. § 57.4462"
title: "30"
number: "57.4462"
heading: "Storage of combustible liquids underground."
url: "https://uscodex.org/cfr/30/57.4462"
---

# §57.4462. Storage of combustible liquids underground.


The requirements of this standard apply to underground areas only.

- (a) Combustible liquids, including oil or grease, shall be stored in non-glass containers or storage tanks. The containers or storage tanks shall be—
  - (1) Capable of withstanding working pressures and stresses and compatible with the type of liquid stored;
  - (2) Maintained in a manner that prevents leakage;
  - (3) Located in areas free of combustible materials or in areas where any exposed combustible materials are coated with one inch of shotcrete, one-half inch of gunite, or other noncombustible material with equivalent fire protection characteristics; and
  - (4) Separated from explosives or blasting agents, shaft stations, and ignition sources including electric equipment that could create sufficient heat or sparks to pose a fire hazard. Separation shall be sufficient to prevent the occurrence or minimize the spread of fire.
- (b) Storage tanks shall be vented or otherwise constructed to prevent development of pressure or vacuum as a result of filling, emptying, or atmospheric temperature changes. Vents for storage of Class II or IIIA liquids shall be isolated or separated from ignition sources.
- (c) At permanent storage areas for combustible liquids, means shall be provided for confinement or removal of the contents of the largest storage tank in the event of tank rupture.
- (d) All piping, valves, and fittings shall be:
  - (1) Capable of withstanding working pressures and stresses;
  - (2) Compatible with the type of liquid stored; and
  - (3) **Maintained in a manner which prevents leakage.**

## Notes

### Authority

Authority: Sec. 101, Federal Mine Safety and Health Act of 1977, Pub. L. 91-173 as amended by Pub. L. 95-164, 91 Stat. 1291 (30 U.S.C. 811).

### Authority

Authority: 30 U.S.C. 811.

### Source

Source: 50 FR 4082, Jan. 29, 1985, unless otherwise noted.