Mississippi Code
In General
§ 75-57-17. Minimum working pressures and wall and head thicknesses

Unless otherwise specified in this chapter, no container shall have a designed working pressure of less than that required for a 100 type. Any container to be charged with a compressed gas which has a vapor pressure at 100 degrees F. of between 151 and 215 pounds per square inch gauge shall not be less than a 200 type. All above-ground containers supplying gases directly to any appliance shall be of the 200 type except containers used in industrial plants such as gins, sawmills, oil well drilling rigs, etc., but such container shall meet all other requirements of this chapter.
It is expressly provided, however, that on and after July 1, 1960, no container manufactured after July 1, 1960, with a working pressure of less than that required for a 200 type container, except refrigerated storage or storage used at refineries, shall be installed or used in this state as a domestic, commercial or industrial stationary container.

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