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