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• 0 FROM COMPRESSOR PRE55URE RELIEF DEVICE AIR SUPPLY VALUE RESERVOIR FITTING AIR SUPPLY GAUGE SERVICE FITTING FIGURE 2-4 SECONDARY (EXTERNAL) TANK TEST CAUTION: Do not pressurize the secondary tank (interstitial space) or the primary tank may rupture and cause tank failure. Check the exterior of the tank for monitoring liquid — if liquid is found, wipe the tank dry and verify that the liquid does not reappear. Lift the tank to check the bottom. Do not roll the tank. DANGER: Do not stand under the tank while it is being lifted. When the test is complete, remove the test manifold. Visually check the interior of the tank for liquid. Replace the protective covers in the service fitting and the reservoir fitting, Xerxes tanks must be installed using either pea gravel or crushed stone which meets the following specifications. 40 GENERAL: The material is washed and free flowing and conforms to the specification of ASTM C-33 para. 9.1, sizes 6 through 8. No more than 5% (by weight) of the material may pass through a #8 sieve. It is recommended that the supplier certify that the material conforms to ASTM C-33 and any other applicable specifications. (For additional information, refer to the Xerxes pamphlet Fiberglass Tank Backfill Guidelines.) PEA GRAVEL CRUSHED STONE FIGURE 31 FIGURE 3-2 PEA GRAVEL: Mix of rounded particles — sizes between 118" and 314". CRUSHED STONE: Mix of angular particles — sizes between 118" and 112". NOTE: If material which meets these specifications is not available, contact the Xerxes Technical Service Department for information on approved alternate materials and installation instructions. Using other than approved bedding and back- fill materials without Xerxes' prior written approval will void the tank warranty and may result in tank failure. • The installing contractor must take all precautions necessary to protect employees working in or near a tank excavation. These precautions should include, but are not limited to: • Location and protection of any utility installations near the excavation before opening the excavation; • Means of securing the walls of the excavation; • Means of preventing exposure of employees to hazardous fumes from the excavation; • Protection of employees from hazards associated with water accumulation in the excavation; • Barricades, etc. to prevent unauthorized vehicle or pedestrian traffic; • Inspection of the excavation and surrounding area at least daily. For additional information on excavation, trenching and shoring safety practices, consult OSHAs Construction Industry Standards Part 1926, Subpart P The minimum depth of the excavation is normally determined by the presence or absence of groundwater and the presence or absence of traffic at the site. These dimensions are critical to the successful installation of a tank and are often regulated by code. Refer to: • federal, state and local codes • NFPA 30 & API 1615 • figures 41 to 4-4 below. NOTE: Numbers in brackets [ ] refer to 12'tanks. FIGURE 41 Tanks subjected to traffic loads must have a cover depth of at least 18 [36] inches of backfill plus 9 inches of asphalt. An acceptable alternative is a minimum of 18 [36] inches of backfill plus 6 inches of reinforced concrete. FIGURE 4-2 NOTE: Numbers in brackets [ ] refer to 12' tanks. Tanks subjected to traffic loads and high water must have a minimum of 30 [36] inches of backfill and either 9 inches of asphalt or 6 inches of reinforced concrete.