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4.3.5. During pressure tests, ambient air temperature can affect pressure -gauge readings. 4.3.6. When testing tanks with wet monitoring, remove the reservoir fitting plug. 4.3.7. If the tank has threaded fittings, the installer is responsible for selecting a thread sealant that is compatible with the product being stored. Some sealants cannot be used with some stored products. 4.3.8. Remove factory -supplied temporary plugs and install permanent plugs in all openings where piping will not be installed. 4.3.9. Make sure all manway bolts or flange bolts are torqued to 25 ft -Ib [34 N -m], and fitting plugs are properly doped and sealed. 4.3.10. The tank may be pressure tested with the factory -supplied temporary plugs. Redope and tighten temporary plugs if needed. 4.3.11. Keep one service fitting open in each compartment forthe test manifold. 4.3.12. Tanks equipped with flanged nozzles may require contractor -supplied blind flanges for preinstallation pressure testing. 4.4. PRESSURIZING THE PRIMARY TANK 4.4.1. Install the test manifold in the open service fitting and connectthe pressure source to the test manifold. 4.4.2. If the interstitial space is dry, close the valve on the interstitial test manifold before pressurizing the primary tank. 4.4.3. Open the pressure -supply valve and pressurize the primary tank to 5 psig [35 kPa] (3 psig [21 kPa] for 12 -foot -diameter tanks). Allow a few minutes for the temperature in the tank to stabilize, then allow the pressure to stabilize by adding or removing pressure as necessary. 4.4.4. Close the valve on the primary tank test manifold and disconnect the pressure supply. 4.4.5. Hold and monitor the pressure fora minimum of 1 hour. 4.4.6. If the interstitial test manifold shows a pressure build-up in the interstitial space of a dry -monitor, double-wall tank, contactthe manufacturing facility that shipped the tank. NOTE: Do not attempt unauthorized repairs. 4.5. PRESSURIZING THE INTERSTITIAL SPACE IN A DRY TANK A WARNING Never lift or hoist a tank under pressure. Failure to follow this warning could result in death or serious injury. NOTE: Do not attempt unauthorized repairs. 4.5.1. Tanks with a dry interstitial space come with a quick -disconnect assembly that may be used as the interstitial test manifold. See Figure 4-2. 4.5.2. If the tank is not configured as shown in Figure 4-2 prior to installation, contact the manufacturing facility that shipped the tank. --------------------- Interstitial Nylon Tie Test Manifold 1 - - I ----------------- ---------------' Quick Disconnect ------ Assembly Monitor Monitor Access Fitting Access,Fitti ALTERNATE STANDARD METHOD METHOD 4.5.3. The quick -disconnect assembly must not be connected to the service fitting when pressure testing the primary tank. Keep the nylon tie in place. 4.5.4. Maintain the pressure in the primary tank. NOTICE Do not connect the pressure supply directly to the access fitting for interstitial -space monitoring. Pressurizing the secondary tank (in- terstitial space) by itself could damage the primary tank or cause tank failure. 4.5.5. Free the hose from the service fitting by cutting the nylon tie 4.5.6. Insert the hose into the quick -disconnect fitting and open the valve to allow pressure to transfer from the primary tank to the interstitial space. 4.5.7. Reconnect the pressure -supply line. Allow the pressure to stabilize at 5 psig [35 kPa] (3 psig [21 kPa] for 12 -foot -diameter tanks) by adding or removing pressure as necessary. 4.5.8. Close the pressure -supply valve on the test manifold and disconnect the pressure -supply line. 4.6. SOAPING THE TANK 4.6.1. After pressurizing the tank, soap the tank to check the tank's i nteg rity. • Soap either the fittings, manways and covers or the entire exterior of the tank, depending on what part of the testing process the tester is at and what kind of tank is being pressure tested. See Pressure Testing Sidebar instructions for specific types of tanks. • Watch for active bubbles. There should not be any. • During freezing conditions, a suitable solution such as windshield washer fluid may be added to the soap and water mixture. 17