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1926.153(m)(1) Application
This paragraph applies specifically to systems utilizing storage containers other than those constructed in accordance with DOT specifications. Paragraph (b) of this section applies to this paragraph unless otherwise noted in paragraph (b) of this section.
1926.153(m)(2) Design Pressure and Classification of Storage Containers
Storage containers shall be designed and classified in accordance with Table F-31.

Table F-31
Container type For gases with vapor press. Not to exceed lb. per sq. in. gage at 100 deg. F. (37.8 deg. C.) Minimum design pressure of container,
lb. per sq. in. gage
1949 and earlier editions of ASME Code (Par. U-68,U-69) 1949 edition of ASME Code
(Par. U-200, U-201); 1950, 1952, 1956, 1959, 1962, 1965, and 1968 (Division 1) editions of ASME Code; All editions of API-ASME Code(3)
80 (1) 80 (1) 80 (1) 100 (1)
100 100 100 125
125 125 125 156
150 150 150 187
175 175 175 219
200 (2) 215 200 250
   Footnote(1) New storage containers of the 80 type have not been authorized since Dec. 31, 1947.

   Footnote(2) Container type may be increased by increments of 25. The minimum design pressure of containers shall per 100 percent of the container type designation when constructed under 1949 or earlier editions of the ASME Code (Par. U-68 and U-69). The minimum design pressure of containers shall be 125 percent of the container type designation when constructed under: (1) the 1949 ASME Code (Par. U-200 and U-201), (2) 1950, 1952, 1956, 1959, 1962, 1965, and 1968 (Division 1) editions of the ASME Code, and (3) all editions of the API-ASME Code.

   Footnote(3) Construction of containers under the API-ASME Code is not authorized after July 1, 1061.
1926.153(m)(3)
Containers with foundations attached (portable or semiportable b containers with suitable steel "runners" or "skids" and popularly known in the industry as "skid tanks") shall be designed, installed, and used in accordance with these rules subject to the following provisions:
1926.153(m)(3)(i)
If they are to be used at a given general location for a temporary period not to exceed 6 months they need not have fire-resisting foundations or saddles but shall have adequate ferrous metal supports.
1926.153(m)(3)(iii)
The bottom of the skids shall not be less than 2 inches (5.08 cm) or more than 12 inches (30.48 cm) below the outside bottom of the container shell.
1926.153(m)(3)(iv)
Flanges, nozzles, valves, fittings, and the like, having communication with the interior of the container, shall be protected against physical damage.
1926.153(m)(3)(v)
When not permanently located on fire-resisting foundations, piping connections shall be sufficiently flexible to minimize the possibility of breakage or leakage of connections if the container settles, moves, or is otherwise displaced.
1926.153(m)(3)(vi)
Skids, or lugs for attachment of skids, shall be secured to the container in accordance with the code or rules under which the container is designed and built (with a minimum factor of safety of four) to withstand loading in any direction equal to four times the weight of the container and attachments when filled to the maximum permissible loaded weight.
1926.153(m)(3)(ii)
They shall not be located with the outside bottom of the container shell more than 5 feet (1.52 m) above the surface of the ground unless fire-resisting supports are provided.
1926.153(m)(4)
Field welding where necessary shall be made only on saddle plates or brackets which were applied by the manufacturer of the tank.

Related Code Sections

1926.153(m)(3)(iv) Fire Protection and Prevention,
Flanges, nozzles, valves, fittings, and the like, having communication with the interior of the container, shall be protected against physical damage ...