COMPLIANCE INFO_PRE 2019 - Laserfiche WebLink

Home Browse Search

P = pressure (.433 x S.G. x H), PSI H = fluid head, ft. S. G. = specific gravity, g/cm^3 O.D. = outside diameter, in. 9.1.1 The hydrostatic design stress shall be determined by multiplying the hydrostatic design basis, determined by ASTM D2837 using rotationally molded samples, with a service factor selected for the application. The hydrostatic design stress is 600 PSI at 73 degrees Fahrenheit for Type II materials. In accordance with the formula in 7. 1, the tank shall have a stratiform (tapered wall thickness) wall. 9.1.2 The hydrostatic design stress shall be derated for service above 100 degrees Fahrenheit and for mechanical loading of the tank. 9.1.3 The standard design specific gravity shall be 1.5 or 1.9. 9.1 The minimum required wall thickness for the cylinder straight shell must be sufficient to support its own weight in an upright position without any external support. Secondary containment tanks shall be designed per the manufacturer's standard containment thickness requirements. The secondary containment shall be configured to allow shipment of the primary tank inside of the secondary tank. The shipment shall be done without the aid of additional spacer blocks which can be lost during shipment causing tank damage. 9.2 The top head must be integrally molded with the cylinder shell. The minimum thickness of the top head shall be equal to the top of the straight wall. The primary tank top shall be configured to prevent rain water from entering the secondary containment tank. The top head of tanks with 550 or more gallons of capacity shall be designed to provide a minimum of 1300 square inches of flat area for fitting locations. The primary tank shall be keyed to the secondary tank preventing primary tank rotation. The secondary containment shall have 115% of the normal fill capacity of the primary tank. 9.3 Tanks with 550 or more gallons of capacity shall have a minimum of 3 lifting lugs integrally molded into the top head. The lifting lugs shall be designed to allow erection of empty primary and secondary tanks. Tanks shall be capable of being lifted into position as a unit (primary and secondary tanks). 9.4 The tank shall be designed to provide a minimum of 4 tie -down lugs integrally molded into the top head. The tie -down lugs shall be designed to allow tank retention in wind and seismic loading situations without tank damage. The primary/secondary tank unit shall be configured to allow direct primary tank base retention for seismic load conditions. The base retention unit shall be anchor bolted to an appropriate structure and not require additional spacer blocks. Refer to section 14.0 for tank tie -down accessories. Table II — Tank Schedule Tank Reference # Quantity Capacity - Side Wall Specific Gravity— designed Primary Tank Secondary Tank JUL 2 8 Diameter nominal Height feet maximum N 2014 AL HEALTH TIENT