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TANKTESTING 5. TIESTINGTANKS 5.2.1.2. Vacuum monitored tanks must be under 5.1. Testing Single-Wall Tank(s) minimum vacuum for at least 7 days.If 5.1.1. Comply with the requirements of Section 4. this requirement is not met,and air/soap P Y q test is required (see Section 4).The date 5.1.2. Con nect"Tank Test Manifold"to a tank fitting. the vacuum was applied to the tank is 5.1.3. Connect the pressure source to the"Tank Test located on or near the vacuum gauge. Manifold" 5.2.1.3. Upon arrival of the tank at the job-site, 5.1.4. Pressurize tank to 5 psig maximum the contractor must record the vacuum (3 psig for 12'tanks)(see Figure 5-1). date,the arrival date,and the vacuum level from the gauge.This should be Figure 5-1 done while the tank is on the truck or Air Supply immediately after off loading. 5.2.1.4. A tank shipped under vacuum can be installed and backfilled with the vacuum intact if both of the following conditions are met: • The vacuum date precedes the tank C: 5 psig installation by at least 7 days. (3p5i9f0T12'WnW • The vacuum gauge reads at least 10"Hg (34kPa). 5.2.1.5. If the tank installation date is 7 days or less from the vacuum date OR if the 5.1.5. Close the air supply valve to the primary tank. vacuum level is less than 10"Hg,the 5.1.6. Disconnect the air supply. vacuum on the annular space must be released and both the primary tank 5.1.7. Monitor the pressure readings for 30 minutes and the secondary tank must be tested for any loss in pressure from the initial reading for tightness before installation and which may indicate a leak. backfilling. 5.1.8. While under pressure,cover tank outer surface, 5.2.1.6. If the tank installation date is more than including fittings and manway(s),with soap 7 days from the vacuum date and the solution and inspect. vacuum level is at least 10"HG,the tank 5.1.9. After completing air test,release pressure. may be backfilled to the tank top while 5.1.10. Remove all gauges,valves,and hose assemblies. holding vacuum on the annular space. 5.1.11. Replace and tighten fitting plug(s). 5.2.2. After backfilling to tank top 5.1.12. Replace the plastic vent plugs in the open 5.2.2.1. Pressurize only the primary tank and fittings. all compartments while maintaining 5.1.13. Refer to INST 6038 for procedure to remove vacuum on the annular space.Cover factory equipped on-site pressure test fittings and manway(s)with soap solution and inspect. components. 5.2.2.2. In the unlikely event a tank leak is 5.2. Double-Wall Tanks Shipped Under discovered,discontinue the installation Vacuum and immediately call CSI Field Services to schedule a repair. 5.2.2.3. After the soap test is complete,release Vacuum monitoring is less sensitive and less reliable the pressure on the primary tank,release the vacuum on the annular space and than the air/soap test. Several variables can affect the accuracyof vacuum monitoring including removethehe anularspacuge,and egaing.uge piping g g and seal the annular space fitting. environmental conditions(e.g.temperature,pressure, 5.2.2.4. If the vacuum level is ever less than altitude)and/or equipment failure. 10' 'H g,immediately call CSI Field Services. 5.2.1. Pre Installation 5.3. Testing Double-Wall Tank(s) 5.2.1.1. CSI double-wall tanks may be shipped With Dry Annular Space from the factory with the annular space under vacuum.The vacuum serves to confirm the integrity of the primary and secondary(outer)walls prior to [Do not connect the air supply directly to the annularshipment,during shipment,handling, ace monitoring fitting or tank damage will result. and off loading.This option may expedite tank installation by minimizing testing procedures. 8