Minnesota Administrative Rules

7151.5200 TANK AND PIPING STANDARDS.

Subpart 1.

Tank and piping design standards.

New tanks and the related appurtenances must be designed and constructed in accordance with the applicable standards under part 7151.2100, subpart 2.

Subp. 2.

Underground storage tanks.

Tanks designed and constructed for service as underground storage tanks must not be used for aboveground storage.

Subp. 3.

Used aboveground storage tanks.

A.

Except as provided in item C, an aboveground storage tank that has been removed from a facility must not be reinstalled at a second facility for the purpose of substance storage unless:

(1)

the tank is determined to be sound by one of the following leak test methods:

(a)

tracer gas test;

(b)

vacuum test;

(c)

air pressure test; or

(d)

hydrostatic test; and

(2)

the area of secondary containment at the new location which is directly under the tank is designed and constructed to provide for the detection of a release of a stored substance before the release permeates through the containment. Methods of leak detection include:

(a)

visual monitoring of elevated tanks as specified in part 7151.7200, subpart 4;

(b)

interstitial monitoring between the tank's inner and outer shell or the tank's shell and the containment area; or

(c)

vapor monitoring in the soil directly under the tank bottom or perimeter and above the water table.

B.

Except as provided in item C, a tank that has been lifted or moved within a facility must not be reinstalled for the purpose of substance storage unless:

(1)

the tank is determined to be structurally sound through:

(a)

thorough internal and external cleaning, degassing, and inspection; or

(b)

a leak test is conducted pursuant to item A, subitem (1); and

(2)

the area of secondary containment which is directly under a tank is designed and constructed to provide for the detection of a release of a stored substance.

C.

The following are exempt from the requirements of this subpart:

(1)

portable tanks which are mounted on wheel carriages, which have legs cast into the construction, or which are mounted on forklift skids; and

(2)

double-walled tanks.

Statutory Authority:

MS s 115.03

History:

23 SR 883; 25 SR 556

Published Electronically:

October 2, 2007