2.3.2.5.Liquid Manure Storage Tanks

(0.1) Liquid manure storage tanks shall be constructed of steel, reinforced concrete or prestressed concrete. (1) Tops of liquid manure storage tanks that are accessible to vehicular traffic or used as a floor in a farm building shall be designed for the loads due to their intended use and occupancy. (2) Tops of liquid manure storage tanks that are located outdoors but not exposed to vehicular traffic shall be designed for the dead load plus the snow and rain loads prescribed in Subsection 4.1.6. or for the dead load plus 2 kPa, whichever produces the most critical effect. (3) Walls and partitions of liquid manure storage tanks shall be designed for (a) an internal lateral pressure based on an equivalent fluid density of 10 kN/m 3 for liquid manure, and (b) the anticipated internal lateral ice pressure. (See Note A-2.3.2.5.(3)) (4) Vertical external walls of liquid manure storage tanks located below ground level shall be designed for (a) the anticipated lateral earth pressure, which shall not be used to reduce the effects of the internal lateral pressures specified in Sentence (3), and (See Note A-2.3.2.5.(4)(a)) (b) a lateral surcharge load of 5 kPa, applied uniformly below ground level, where earth within 1.5 m of the walls is subject to vehicular loads. (5) Concrete for liquid manure storage tanks shall (a) be made from HS or HSb cement, (b) have a 28-day strength of at least 32 MPa, and (c) have a water/cement materials ratio of not more than 0.45. (6) Liquid manure storage tank walls, bases and appurtenances, including piping for the conveyance of liquid manure and associated connections and joints, shall be designed and constructed to minimize leakage of liquid manure. (See Note A-2.3.2.5.(6)) (7) Liquid manure storage tanks shall be placed on undisturbed soil free of any organic, deleterious and extraneous materials and capable of supporting the superimposed design loads from the tanks. (8) Where granular fills are used between the bases of liquid manure storage tanks and the undisturbed soil, the granular fills shall be compacted to a Standard Proctor density of not less than 95%.