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12. Open valve to vent primary tank. Figure D5-1 <br /> 13. Maintain pressure on the annular space Air Supply Air Supply Air Supply <br /> (see Figure D4-3). valve closed <br /> Figure D4-3 <br /> Valve Open Hose <br /> Primary Tank <br /> Fitting Valve Closed <br /> Annular Space 19 <br /> Fitting Annular Space 0S1g <br /> — 5 psig <br /> 7. Close valve on each compartment"Tank Test <br /> Manifold." Disconnect the air supply line. <br /> 8. Monitor the pressure for 30 minutes for any loss in <br /> 14. Observe and monitor the gauge the annular pressure from the initial reading which may indicate <br /> g g a leak. <br /> space for 30 minutes for any loss of pressure which <br /> may indicate a leak. 9. With all compartments under pressure, cover fittings <br /> 15. While under pressure, cover tank outer surface, <br /> and manway(s)with soap solution and inspect. <br /> including fittings and manway(s)with soap solution 10. Open valve between primary tank and annular <br /> and inspect. space in order to pressurize the annular space using <br /> 16. After completing air test, release pressure. the existing pressure in the primary tank(pressure <br /> p g p in the primary tank may drop slightly). <br /> 17. Remove all gauges, valves, and hose assemblies. 11. Close valve to annular space. <br /> 18. Replace and tighten fitting plug(s). 12. Open valves to vent all compartments <br /> 19. Replace the plastic vent plugs in the open fittings. (maintain 5 psig on annular space) <br /> (see Figure D5-2). <br /> ® ® Figure D5-2 <br /> ® ® ® Valve Open Valve Closed Valve Open Valve Open <br /> psig <br /> Do not connect the air supply directly to the annular <br /> space monitoring fitting or tank damage will result. <br /> Perform the following in the order listed. <br /> 1. Comply with the requirements of Section C. <br /> 2. Connect"Tank Test Manifolds"to each <br /> compartment. 13. Monitor the pressure for 30 minutes for any loss in <br /> 3. Connect hose between a primary tank fitting and pressure from the initial reading which may indicate <br /> "Annular Space Gauge and Valve" a leak. <br /> (refer to Figure D4-1). 14. While under pressure, cover tank outer surface, <br /> 4. Close valve between primary tank and annular including fittings and manway(s),with soap solution <br /> space. and inspect. <br /> 5. Connect the pressure source to the 15. After completing air test, release pressure. <br /> "Tank Test Manifold"on each compartment. 16. Remove all gauges,valves, and hose assemblies. <br /> 6. Pressurize all compartments to 5 psig ( 17. Replace and tighten fitting plug(s). <br /> (3 psig for 12'tanks). 18. Replace the plastic vent plug in the open fittings. <br /> (see Figure D5-1) <br /> 9 <br />