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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,contact the manufacturing facility that shipped the tank. 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 Interstitial responsible forselectingathread sealantthatiscompatible Test Manifold Nylon Tie with the product being stored.Some sealants cannot be used with some stored products. -------- ------- 4.3.8.Remove factory-supplied -----[----- 4.3.8.Removefactory-supplied temporary plugs and - install permanent plugs in all openings where piping will not be installed. -----<>-------� Assembly Quick Disconnect � �, 4.3.9.Make sure all manway bolts orflange 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. ill 4.3.11. Keep one service fitting open in each compartment for the 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 connect the 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 conned 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 secondarytank(in- tankto 5 psig[35 kPa](3 psig[21 kPa]for 12-foot-diameter tanks). terstitial space)by itself could damage the primary tank orcause Allow a few minutesforthe temperature in the tank to stabilize, tankfailure. 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.Insertthe hose into the quick-disconnect fitting and open thevalve and disconnect the pressure supply. to allow pressure to transfer from the primary tank to the interstitial space. 4.4.5.Hold and monitorthe pressure fora 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]far 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,contact the 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. 4.5. PRESSURIZING THE INTERSTITIAL SPACE 4.6.SOAPING THE TANK IN A DRY TANK 4.6.1.After pressurizing the tank,soap the tank to check the tank's integrity. A WARNING • Soap either the fittings,manways and covers or the entire exterior of the Never lift or hoist a tank under pressure.Failuretofollow tank,depending on what part of the testing process the tester is at and thiswarning could resultin 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 foractive bubbles.There should not be any. 4.5.I.Tankswithadryinterstitialspace come with aquick-disconnect • During freezing conditions,a suitable solution such aswindshield assembly that maybe used as the interstitial test manifold.See Figure 4-2. washerfluid maybe added to the soap and water mixture. 4:TESTING DURING INSTALLATiui. 17