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58.6 IDUSTRIAL RELATIONSTITLE 8 (Replstel- /No. 32--87.78) The Division may approve or accept devices upon satisfactory evi- dence that they are designed and constructed for safe opeation in anhy- drous ammonia service. Drawings and calculations for custom-built devices must be submit- ted to the Division for acceptance. Both the drawings and calculations must be signed by a registered professional engineer. History: 1. Amendment filed 12$72 as procedural and organizational;effective upon filing (Register 72, No. 50). 2. Amendment filed 3-28-75; effective thirtieth day thereafter (Register 75, No. 13). 501. Installation of Aboveground Storage Tanks for Other Than.Re- frigeration Service. (a) Stationary tanks shall be installed above- ground on firm masonry or concrete foundations, or on full length skids providing a bearing area limiting foundation loadings to not more than 2,000 pounds per square foot. Unless supported by continuous skids welded to pads on the tank shell, aboveground horizontal storage tanks shall have no more than 2 points of support longitudinally. Where necessary, tanks shall be securely anchored or weighted to prevent floating. A tank may be installed on saddles, directly on concrete foundations, or it may be supported by properly designed metallic structural sup- ports. When the tank is installed directly on concrete foundations, a corrosion pad shall be provided at the points of contact with the founda- tion. These corrosion pads shall be at least '/,6 inch thick, and shall have a width at least equal to the width of the foundation at the point of Ccontact with the tank, but in no case shall they be less than 8 times the shell thickness in width. When corrosion pads or pad-type steel supports are used, the pad shall have rounded or semielliptically shaped ends, and shall be at- tached to the shell with a continuous seal weld. Corrosion pads shall be not less than '/4 the circumference of the shell in length. Unless installed on concrete pads, skid tanks shall be placed on engi- neered soil or road base topped with well-drained gravel or oiled sand, capable of supporting 2,000 poundsper square foot. Sufficient space shall be provided between stationary storage tanks to permit access for fire fighting. This space shall not be less than 5 feet for tanks over. 1,200-gallon capacity. Tanks exceeding 1,200-gallon capacity shall be so installed that the bottom outside surface of the tank is at least 12 inches above ground level. (b) All tanks over 1,200-gallon capacity shall be installed on founda- tions in such a manner as to permit expansion and contraction. Every tank shall be'so supported as to prevent the concentration of excessive loads on the tank at the points of support. All foundations and fastenings shall be designed toprovide reasonable safety under imposed loadings, including wind, earthquake, vibrations, etc.