The Wrangell sentinel., 1929-02-21
ARTICLE l
Construction of Underground Tanks

wrought iron of a minimum gauge 1 GU. S. Standard) depending upon the capacity given in the following table:
 Capacity Minimum thick l of tanks ness of material l to 560 gallons s..........1 IA gauge 561 to HOO gal. .........12 gauge 1101 to 4O0O gal. .........7 gauge 40O1 to 10500 gal. ....... 4 inch 10501 to 10000 gal. ........ s inch
 For liquids of 35 degrees Baume and below, tanks may be of concrete.
 Section 2. Joints and Connections. All joints shall be riveted and calked, brazed, welded or made by some equal satisfactory process. Tanks shall be tight and sufficiently strong to bear without injury the most severe strains to which they may be subject ed Shells of tanks shall be properly lreinforeed where connections are made, and all connections made through the top of tank above the liquid level.
 Section 3. Rust Proofing. All tanks shall be thoroughly coated on the outside with tar, asphaltum or other suitable rust resisting materi- al, depending upon the condition of the soil in which they are placed. Where soil is impregnated with cor rosive materials, tanks shall be made of heavier metal.
 Section 4. Venting of Tank. An independent, permanently open gal vanized iron vent pipe, terminating outside the building shall be provided for every tank. The lower end of the vent pipe shall not extend through the top into the tank for distance of more than one inch.
 Section 5. Setting of Tanks. All underground tanks are to be buried with top of tank not less than IS inches below the surface of the ground, and below the level of any piping to which the tank may be con nected except that in lieu of the 18- inch cover, tank may be buried un- der IS inches of earth and a cover of reinforced concrete of at least 6 inches in thickness provided, which shall extend at least one foot beyond the outline of the tank in all direc- tions, concrete slab to be set on firm, well-tamped earth foundation. l Tanks shall be securely anchored or weighted in place to prevent floating Where tank cannot be entirely bur jed, it shall be covered over with earth to depth of at least 8 inches and sloped on all sides, slope to be not less than to 1. Such cases shall also be subject to such other require ments as may be deemed necessary by the Fire Protection Committee and the Common Council of the City of Wrangell.
 If tanks cannot be set below the level of all piping to which it is con- nected, satisfactory arrangements shall be provided to prevent siphon- ing of gravity flow in case of acci- dent to the piping.
 When located underneath a build ing, the tank shall be buried with the top of the tank not less than one foot below the level of the floor. The floor immediately above the tank shall be reinforced concrete at least 6 inches thick or some other type of construction of equivalent strength and fire resistance, extending at least one foot beyond the outline of the tanks in all directions, and provided with ample means of support inde- pendent of any tank.
 Section 6. When Building Rests on Filling. Tanks placed underneath buildings which have their main sup port from piling must be encased in a box of concrete of at least 6 inches in thickness, the inside walls of which must be at least 6 inches at all points from the outside wall of the tank except on the bottom side. The tank and concrete case must be sup ported independent of the building. All feed pipes leading from the tank to the building must be encased in concrete or some construction of equivalent strength and fire resist ance.
 ARTICLE 9
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