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For All Tests: 00 ♦ Install air gauge at the fitting where the air pressure hose is connected to the primary tank. ♦ I nstall a second gauge in some other primary tank fitting to use as a check against the first primary tank gauge to insure that the tank is not over pressurized. ♦ Install a third gauge connected to the annular space at the manifold assembly. ♦ Use a maximum 15 psi air gauge with 1/ or'/2 Ib. in- crements. ♦ A contractor supplied pressure relief valve must be con- nected to the primary tank for additional protection. The relief valve should be sized and set to prevent the tank from being pressurized in excess of the maximum al- lowed test pressure. DO NOT ♦ Lift or hoist a tank under pressure. This could result in personal injury. CAUTION DO NOT Connect the air supply directly to the an- nular space monitoring fitting or tank damage will result. Outer Wall Test PRESSURIZING TANK Step 1 Close manifold valve between primary tank and annular space (see figure 3). Step 2 Pressurize primary tank to 5 psi maximum. Step 3 Use a pressure relief valve. CAUTION Do not connect the air supply directly to the annular space monitoring fitting or tank damage will result. Air supply valve open FIGURE 3 Manifold = to air supply valve Closed -Air gauge I Air gauge Manifold systei (supplied with tan Annular space fitting or Reservoir REMOVE AIR SUPPLY Step 1 Close the air supply valve to the primary tank. Step 2 Disconnect the air supply (see figure 4). PRESSURIZE ANNULAR SPACE Step 1 Open the manifold valve in order to pressurize the tank annular space (see figure 4). Step 2 Pressure in primary tank may drop slightly. FIGURE 4 Air supply —To air supply Manifold valve dosed (disconnected) valve open Air gauge Air gauge Manifold system (suppled vnlh tank) Annular space fitting or Reservoir VISUAL AIR/SOAP TEST Step 1 Monitor the pressure readings for at least 30 minutes. Step 2 At the same time, cover tank outer surface with soap solution (see Visual Air/Soap Test). Step 3 Carefully inspect for leaks as indicated by bubbles. Inner Wall Test Step 1 Close manifold valve to annular space. Step 2 Open air supply valve to vent primary tank. Step 3 Maintain 5 psi pressure on the annular space. Step 4 Monitor air gauge on tank for another 30 minutes, but not more than 60 minutes. After successfully completing air test: Step 1 Release pressure. Step 2 Disconnect and remove air manifold fittings, hose and valve.