7
3.4.2.3. Replace the protective covers in the service fitting and
the reservoir fitting.
3.5. TESTING A SINGLE-WALL MULTICOMPARTMENT TANK
WITH A SINGLE-WALL BULKHEAD
3.5.1. GENERAL
3.5.1.1. Remove all temporary service-fitting plugs.
3.5.1.2. 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 3-6
and FIGURE 3-7.)
3.5.1.3. Before doing the air test of the base tank
(described in
SECTION 3.5.2.)
and the air test of the end tank(s)
(described in
SECTION 3.5.3.)
, install the test manifolds on the base and end
tank(s).
FIGURE 3-6
FIGURE 3-7
FIGURE 3-8
Air Test of End Tank(s)
Air Test of Base Tank
Typical Service Fitting
Monitor Fitting
When Double-Wall
Bulkhead Is Used
Seam for
End Tank
Seam for
Base Tank
Flat
Rib
Seam for
End Tank
Bulkhead
End Tank
Typical Manway with Fittings
Lifting Lug
End Tank
Base Tank
3.4.1.6. Install the test manifold in the open service fitting. Connect
the pressure source to the test manifold.
(See FIGURE 3-5.)
FIGURE 3-5
3.4.1.7. Pressurize the primary tank to 5 psig. Allow the
pressure to stabilize by adding or removing air as necessary.
3.4.1.8. Close the air-supply valve on the test manifold.
Disconnect the air-supply line.
3.4.1.9. Soap all service fittings and manways. Watch for active
air bubbles, which indicate a leak. Look through the laminate for
any active air bubbles rising to the top. Their presence would
indicate an internal leak. Also, check the reservoir for bubbles in
the monitoring fluid.
(The monitoring-fluid level will rise
during the air test.)
3.4.1.10. Monitor the pressure for one hour.
3.4.1.11. When the test is complete, carefully release the air
pressure from the tank by opening the air-supply valve.
3.4.1.12. When the airflow stops, remove the test manifold.
3.4.1.13. Check the level of the monitoring fluid in the reservoir.
It should be at approximately the same level as the pretest level.
3.4.2. SECONDARY TANK (EXTERNAL)
Never pressurize a wet interstitial space. Doing so may
damage the primary tank or cause tank failure.
3.4.2.1. Check the exterior of the tank for monitoring fluid. (The
monitoring fluid is dyed blue to distinguish between moisture
and monitoring fluid.) If monitoring fluid is found, wipe the tank
dry and verify that the monitoring fluid does not reappear. Lift
the tank to check the bottom.
Do not roll the tank.
Do not lift the tank when the tank is under pressure. This
could result in death or serious injury.
3.4.2.2. Visually check the interior of the tank for monitoring
fluid.
There should not be any.
Reservoir Fitting
Pressure-Relief
Device
From Air Supply
Air-Supply
Valve
Air-Supply
Gauge
Service
Fitting
