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'✓ <br /> TestingSingle-Wall Tank D3, D4 <br /> Figure D3-1 D4. DOUBLE-WALL TANKS <br /> WITH DRY ANNULAR SPACE <br /> Valve Open Air Supply Valve Open <br /> Do not connect the air supply directly to the annular <br /> space monitoring fitting or tank damage will result. <br /> SPsig Perform the following in the order listed. <br /> End Main End <br /> 1. Comply with the requirements of Section C. <br /> 2. Connect"Tank Test Manifold"to a tank primary <br /> fitting. <br /> 5. Close the air supply valve on the main 3. Connect hose between a primary tank fitting and <br /> "Tank Test Manifold." Disconnect the air "Annular Space Gauge and Valve." <br /> supply line. 4. Close valve between primary tank and annular <br /> 6. Monitor the main tank air pressure for 30 minutes space. <br /> before proceeding. 5. Connect the pressure source to the"Tank Test <br /> 7. Observe and monitor the air gauge for any loss Manifold"on the main tank. <br /> in pressure from the initial reading, which may 6. Pressurize primary tank to 5 psig maximum <br /> indicate a leak. <br /> 8. Do not release air pressure in main tank. (3 psig for tanks). <br /> D <br /> P (see Figure D4-1) <br /> 9. Connect the pressure source to the"Tank Test <br /> Manifold(s)"on the end tank(s). Figure D4-1 <br /> 10. Pressurize the end tank(s)to 5 psig maximum Hose <br /> (3 psig for 12'tanks). Au supply <br /> Primary Tank <br /> Fitting Valve Closed <br /> (See Figure D3-2) Annular Space � <br /> Fitting Annular Space <br /> Figure D3-2 <br /> Air Supply Air Supply <br /> Valve Closed <br /> 5 psig <br /> Primary Tank <br /> 5psig 5psig 5psig 7. Close the air supply valve to the primary tank. <br /> End Main End 8. Disconnect the air supply. <br /> 9. Open valve between primary tank and annular <br /> space in order to pressurize the annular space <br /> using the existing pressure in the primary tank <br /> 11. Close the valve(s)on the "Tank Test Manifold(s)." (pressure in the primary tank may drop slightly) <br /> Disconnect the air supply line. (see Figure D4-2). <br /> 12. Do not release air pressure on main and end tanks. <br /> Figure D4-2 <br /> 13. Monitor the pressure readings for 30 minutes for <br /> any loss in pressure from the initial reading which Valve Closed Hose <br /> Primary Tank Valve Open <br /> may indicate a leak. Fining <br /> Annular Space <br /> 14. While under pressure, cover tank outer surface, Fitting Annular Space <br /> including fittings and manway(s), with soap solution 5 psig <br /> and inspect. <br /> 15. After completing air test, release pressure. 5 psig <br /> 16. Remove all gauges, valves, and hose assemblies. Primary Tank <br /> 17. Replace and tighten fitting plug(s). <br /> 18. Replace the plastic vent plugs in the open fittings. <br /> 10. While under pressure, cover fittings and <br /> manway(s), with soap solution and inspect. <br /> 11. Close valve to annular space. <br /> s <br />