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// CODE SNIPPET

1926.152(i)(2)(vii) Drainage, Dikes, and Walls for Aboveground Tanks

OSHA 1926 Construction > F Fire Protection and Prevention > 1926.152 Flammable Liquids > 1926.152(i) Tank Storage > 1926.152(i)(2) Installation of Outside Aboveground Tanks > 1926.152(i)(2)(vii) Drainage, Dikes, and Walls for Aboveground Tanks
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1926.152(i)(2)(vii)(A) Drainage and Diked Areas

The area surrounding a tank or a group of tanks shall be provided with drainage as in paragraph (i)(2)(vii)(B) of this section, or shall be diked as provided in (i)(2)(vii)(C) of this section, to prevent accidental discharge of liquid from endangering adjoining property or reaching waterways.

1926.152(i)(2)(vii)(B) Drainage

Where protection of adjoining property or waterways is by means of a natural or manmade drainage system, such systems shall comply with the following:

1926.152(i)(2)(vii)(B)(1) [Reserved]

1926.152(i)(2)(vii)(B)(2)

The drainage system shall terminate in vacant land or other area or in an impounding basin having a capacity not smaller than that of the largest tank served. This termination area and the route of the drainage system shall be so located that, if the flammable liquids in the drainage system are ignited, the fire will not seriously expose tanks or adjoining property.

1926.152(i)(2)(vii)(C) Diked Areas

Where protection of adjoining property or waterways is accomplished by retaining the liquid around the tank by means of a dike, the volume of the diked area shall comply with the following requirements:

1926.152(i)(2)(vii)(C)(1)

Except as provided in paragraph (1)(2)(vii)(C)(2) of this section, the volumetric capacity of the diked area shall not be less than the greatest amount of liquid that can be released from the largest tank within the diked area, assuming a full tank. The capacity of the diked area enclosing more than one tank shall be calculated by deducting the volume of the tanks other than the largest tank below the height of the dike.

1926.152(i)(2)(vii)(C)(2)

For a tank or group of tanks with fixed roofs containing crude petroleum with boilover characteristics, the volumetric capacity of the diked area shall be not less than the capacity of the largest tank served by the enclosure, assuming a full tank. The capacity of the diked enclosure shall be calculated by deducting the volume below the height of the dike of all tanks within the enclosure.

1926.152(i)(2)(vii)(C)(3)

Walls of the diked area shall be of earth, steel, concrete or solid masonry designed to be liquidtight and to withstand a full hydrostatic head. Earthen walls 3 feet (0.912 m) or more in height shall have a flat section at the top not less than 2 feet (0.608 m) wide. The slope of an earthen wall shall be consistent with the angle of repose of the material of which the wall is constructed.

1926.152(i)(2)(vii)(C)(4)

The walls of the diked area shall be restricted to an average height of 6 feet (1.824 m) above interior grade.

1926.152(i)(2)(vii)(C)(5) [Reserved]

1926.152(i)(2)(vii)(C)(6)

No loose combustible material, empty or full drum or barrel, shall be permitted within the diked area.

Related Code Sections


1926.152(i)(2)(vii) Fire Protection and Prevention, Drainage, Dikes, and Walls for Aboveground Tanks
The area surrounding a tank or a group of tanks shall be provided with drainage as in paragraph (i)(2)(vii)(B) of this section, or shall be diked ...
OSHA 1926 Construction > F Fire Protection and Prevention > 1926.152 Flammable Liquids > 1926.152(i) Tank Storage > 1926.152(i)(2) Installation of Outside Aboveground Tanks > 1926.152(i)(2)(vii) Drainage, Dikes, and Walls for Aboveground Tanks
1926.152(i)(2)(vii)(C)(1) Fire Protection and Prevention,
amount of liquid that can be released from the largest tank within the diked area, assuming a full tank. The capacity of the diked area enclosing more ...
OSHA 1926 Construction > F Fire Protection and Prevention > 1926.152 Flammable Liquids > 1926.152(i) Tank Storage > 1926.152(i)(2) Installation of Outside Aboveground Tanks > 1926.152(i)(2)(vii) Drainage, Dikes, and Walls for Aboveground Tanks > 1926.152(i)(2)(vii)(C) Diked Areas > 1926.152(i)(2)(vii)(C)(1)
1926.152(i)(2)(vii)(C)(2) Fire Protection and Prevention,
For a tank or group of tanks with fixed roofs containing crude petroleum with boilover characteristics, the volumetric capacity of the diked area ...
OSHA 1926 Construction > F Fire Protection and Prevention > 1926.152 Flammable Liquids > 1926.152(i) Tank Storage > 1926.152(i)(2) Installation of Outside Aboveground Tanks > 1926.152(i)(2)(vii) Drainage, Dikes, and Walls for Aboveground Tanks > 1926.152(i)(2)(vii)(C) Diked Areas > 1926.152(i)(2)(vii)(C)(2)
1926.152(i)(2)(vii)(C)(3) Fire Protection and Prevention,
Walls of the diked area shall be of earth, steel, concrete or solid masonry designed to be liquidtight and to withstand a full hydrostatic head ...
OSHA 1926 Construction > F Fire Protection and Prevention > 1926.152 Flammable Liquids > 1926.152(i) Tank Storage > 1926.152(i)(2) Installation of Outside Aboveground Tanks > 1926.152(i)(2)(vii) Drainage, Dikes, and Walls for Aboveground Tanks > 1926.152(i)(2)(vii)(C) Diked Areas > 1926.152(i)(2)(vii)(C)(3)
1926.152(i)(2)(vii)(C)(4) Fire Protection and Prevention,
The walls of the diked area shall be restricted to an average height of 6 feet (1.824 m) above interior grade ...
OSHA 1926 Construction > F Fire Protection and Prevention > 1926.152 Flammable Liquids > 1926.152(i) Tank Storage > 1926.152(i)(2) Installation of Outside Aboveground Tanks > 1926.152(i)(2)(vii) Drainage, Dikes, and Walls for Aboveground Tanks > 1926.152(i)(2)(vii)(C) Diked Areas > 1926.152(i)(2)(vii)(C)(4)
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