UL 70:2001 pdf download Septic Tanks, Bituminous- Coated Metal
1 Scope
1.1 These requirements cover single and multiple compartment, bituminous-coated metal septic tanks foruse in residential sewage systems.
1.2 The minimum liquid capacity of septic tanks covered by these requirements is 500 gallons (1985 L)
1.3 For the purpose of these requirements, a residential septic tank is an enclosed, watertightsewage-settling tank intended to retain the solids in immediate contact with the sewage flowing throughthe tank for a period of time to secure satisfactory decomposition of settled solids by biochemical action.
1.4 The liquid capacity is the capacity of the tank below the bottom of the outlet when the tank is level
2 Instructions
2.1 The manufacturer shall provide, with each septic tank, adequate instructions for installation andservicing.
2.2 The instructions shall include such directions and information as deemed by the manufacturer to beadequate for attaining proper installation, maintenance, and use of the product.
CONSTRUCTION
3 General
3.1 Components
3.1.1 Except as indicated in 3.1.2, a component of a product covered by this standard shall comply withthe requirements for that component.
3.1.2 A component is not required to comply with a specific requirement that:
a) lnvolves a feature or characteristic not required in the application of the component in theproduct covered by this standard, or
SHIMIsH
b) ls superseded by a requirement in this standard.
3.1.3 A component shall be used in accordance with its rating established for the intended conditions ofuse.
3.1.4 Specific components are incomplete in construction features or restricted (n performancecapabilities Such components are intended for use only under limited conditions; such as certaintemperatures not exceeding specified limits, and shall be used only under those specific conditions.
3.2 Units of measurement
3.2.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.
3.3 Material
3.3.1 A tank shall be made of commercial-grade steel of suitable welding quality. Only new materials shalbe used.
3.4 Thickness of metal
3.4.1 The thickness of sheet metal used in the construction of a tank and all other parts, including thebaffles and partitions (where used), shall be No. 14 MSG, nominal thickness 0.075 inch (1.91 mm) orheavier.
3.4.2 The thickness of each piece is to be determined by five micrometer readings spaced equally alongan edae of the full piece as rolled. Thickness is to be measured on the sheet not less than 3/8 inch (9.5mm) from a cut edge and not less than 3/4 inch (19.1 mm) from a mil edge. No measurement is toindicate a thickness of less than 0.067 inch (1.70 mm).
3.5 Load
3.5.1 A tank shall be so constructed that it withstands a uniformly distributed vertical load of 150 poundsper square foot (732 kq/m2) without permanent distortion.
3.6 Watertightness
3.6.1 A tank shall be constructed so as to be watertight. Fittings or covers or both shall be tight, whenproperly installed, to prevent the entrance of significant amounts of rain water, surface drainage, or groundwater.
3.7 Workmanship
3.7.1 A tank shall be free from defects that affect its serviceability or durability.

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