Warnings following 3.1.8.)Watch for active air bubbles, which
indicate a leak. Pay special attention to fittings and manways.
3.6.5.2. Monitor the pressure for one hour.
3.6.5.3. Monitor all gauges for either a loss in pressure from the
tanks or an increase in pressure in the bulkhead interstitial
space.
3.6.5.4. After the test is completed, release all tank air pressure
and remove gauges.
3.6.5.5. Replace the protective covers in the service fittings.
3.7. TESTING A DOUBLE-WALL MULTICOMPARTMENT
TANK WITH A DRY INTERSTITIAL SPACE
Do not connect air supply directly to the interstitial-space
monitor fitting. Pressurizing the secondary tank (interstitial
space) by itself may damage the primary tank or cause
tank failure.
3.7.1. GENERAL
3.7.1.1. Remove all temporary service-fitting plugs.
3.7.1.2. Redope fittings and install plugs in all openings, except
one service fitting in each compartment (needed for the test
manifolds).
Follow instructions in Point 3.1.5. (See FIGURE 3-10
and FIGURE 3-11.)
3.7.1.3. The tank will arrive with a quick-disconnect assembly.
(See FIGURE 3-4.)
3.7.1.4. If the tank is not configured
as shown in FIGURE 3-4
prior to preinstallation testing, call the UST coordinator at the
Xerxes plant nearest you.
FIGURE 3-10
FIGURE 3-11
Air Test of Base Tank
Typical Service Fitting
Seam for
End Tank
Seam for
Base Tank
Flat
Rib
Seam for
End Tank
End Tank
End Tank
Lifting Lug
Typical Manway with Fittings
Optional
Reservoir
Monitor
Fitting
Base Tank
9
FIGURE 3-12
FIGURE 3-13
3.7.2. AIR TEST OF BASE TANK
3.7.2.1. Connect the pressure source to the test manifold on the
base tank.
(See FIGURE 3-3 and FIGURE 3-11.)
3.7.2.2. Pressurize the base tank to 5 psig. Allow the pressure to
stabilize by adding or removing air as necessary.
3.7.2.3. Close the air-supply valve on the test manifold on the
base tank. Disconnect the air-supply line.
3.7.2.4. Soap all service fittings and manways on the base tank.
Watch for active air bubbles, which indicate a leak.
3.7.2.5. Monitor the pressure for one hour.
Do not release air
pressure.
3.7.3. AIR TEST OF END TANK(S)
3.7.3.1. Connect the pressure source to the test manifold on the
end tank(s).
(See FIGURE 3-3 and FIGURE 3-12.)
3.7.3.2. Pressurize the end tank(s) to 5 psig. Allow the pressure
to stabilize by adding or removing air as necessary.
3.7.3.3. Close the air-supply valve on the test manifold on each
end tank. Disconnect the air-supply line.
3.7.3.4. Soap all service fittings and manways on the end
tank(s). Watch for active air bubbles, which indicate a leak.
3.7.3.5. Monitor the pressure for one hour.
3.7.4. AIR TEST OF SECONDARY TANK
3.7.4.1. Attach the quick-disconnect hose assembly from the
monitor fitting to the primary-tank service fitting (with a female
quick-disconnect fitting in place). This will allow air to transfer to
the interstitial space.
(See FIGURE 3-4 and FIGURE 3-13.)
Air-Test Monitoring of Secondary Tank
Air Test of End Tank(s)