33 52 43.11.pdf

FY24 POL Complex 22029 Great Falls Air National Guard, MT W912DW24R0013

FACTORY-FABRICATED FUEL STORAGE TANKS. Product recovery tank must be a U.L. labeled, double wall, steel tank, with interstitial monitor. Tank must be provided with calibrated gage stick and strapping chart.

2.7.1.1 Steel Tank

a. The design, fabrication, erection, testing, and inspection of the double wall tank must conform to the requirements of UL 2085 .

b. Material must be carbon steel plate.

c. Lifting lugs must be located at the balance points.

d. Tank capacity, connections and appurtenance must be as shown on the drawings and as described under "Leak Detection Monitor."

e. The interior and exterior surfaces of tank and vault must be coated for corrosion protection. The interior surface must be coated in accordance with Section 09 97 13.17 THREE COAT EPOXY INTERIOR COATING OF WELDED STEEL PETROLEUM FUEL TANKS. The exterior surface must be coated in accordance with Section 09 97 13.27 HIGH PERFORMANCE COATING

FOR STEEL STRUCTURES.

2.7.1.2 Automatic Tank Gauging (ATG) and Leak Detection Monitor

2.7.1.2.1 ATG

ATG must be the mechanically or electronically actuated type that can continuously monitor a tank's usable liquid level storage capacity. The system must provide a digital readout of a tank's liquid level in terms of inches and gallons. The system must be accurate to plus or minus 1/16 inch.

The system must measure water accumulation in inches from 3/4 to 5 inches off the bottom of a storage tank. Construct system components to be chemically compatible with the fuel to be handled.

2.7.1.2.2 Leak Detection

a. Provide an annular space between the primary and secondary shells to allow for the free flow and containment of all leaked product from the primary tank.

b. Provide the tank with a leak monitoring system capable of sensing leaks in the secondary containment space. The system must detect a leak of fuel through the inner shell to the area between the inner and outer shells. The detector and any equipment in the area of the fuel tanks must be rated for the environment in which it is installed. The system must be a continuous surveillance type. The sensor must be electronic or hydraulic type and must be connected to a control panel. Totally flooded containment space reservoir system must not be permitted. The alarm must be manually reset at the control panel. Use an inert gas that is heavier than air in containment space of the tanks to prevent the forming of condensation. The tank monitoring system must be compatible with the tank furnished and must be as recommended by the tank manufacturer. Provide instructions and equipment required for calibration of the monitoring system and calibration maintenance schedule. Access must be provided to the tank sensor for testing and maintenance.

SECTION 33 52 43.11 Page 10

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