FIGURE 3-9
3.5.2. AIR TEST OF BASE TANK
3.5.2.1. Connect the pressure source to the test manifold on the
base tank.
(See FIGURE 3-3 and FIGURE 3-7.)
3.5.2.2. Pressurize the base tank to 5 psig [3 psig for a 12-foot-
diameter tank]. Allow the pressure to stabilize by adding or
removing air as necessary.
3.5.2.3. Close the air-supply valve on the test manifold in each
compartment. Disconnect the air-supply line.
3.5.2.4. Monitor the pressure for one hour.
Do not release air
pressure.
3.5.3. AIR TEST OF END TANK(S)
3.5.3.1. Connect the pressure source to the test manifold on the
end tank(s).
(See FIGURE 3-3 and FIGURE 3-8.)
3.5.3.2. Pressurize the end tank(s) to 5 psig [3 psig for a
12-foot-diameter tank]. Allow the pressure to stabilize by adding
or removing air as necessary.
3.5.3.3. Close the air-supply valve on the test manifold.
Disconnect the air-supply line.
3.5.4. EXTERNAL SOAP TEST
3.5.4.1. Soap the entire exterior of the tank, checking for leaks.
(Follow instructions in Points 3.1.6. through 3.1.8.,
including
Warnings following 3.1.8.)Watch for active air bubbles, which
indicate a leak. Pay special attention to fittings and manways.
3.5.4.2. Monitor the pressure for one hour.
3.5.4.3. After the test is completed, release all tank air pressure
and remove gauges.
3.5.4.4. Replace the protective covers in the service fittings.
3.6. TESTING A SINGLE-WALL MULTICOMPARTMENT TANK
WITH DOUBLE-WALL BULKHEAD(S)
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.
Air-Test Monitoring of Double-Wall Bulkhead(s)
8
3.6.1. GENERAL
3.6.1.1. Remove all temporary service-fitting plugs.
3.6.1.2. 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.)
3.6.1.3. Before doing the air test of the base tank
(described in
SECTION 3.6.2.)
and the air test of the end tank(s)
(described in
SECTION 3.6.3.),
install the test manifolds on the base and end
tank(s).
3.6.2. AIR TEST OF BASE TANK
3.6.2.1. Connect the pressure source to the test manifold on the
base tank.
(See FIGURE 3-3 and FIGURE 3-7.)
3.6.2.2. Pressurize the base tank to 5 psig [3 psig for a 12-foot-
diameter tank]. Allow the pressure to stabilize by adding or
removing air as necessary.
3.6.2.3. Close the air-supply valve on the test manifold on the
base tank. Disconnect the air-supply line.
3.6.2.4. Soap the fittings on top of the base tank to make sure
fittings are not leaking. Watch for active air bubbles, which
indicate a leak.
3.6.2.5. Monitor the pressure for one hour.
Do not release air
pressure.
3.6.3. AIR TEST OF END TANK(S)
3.6.3.1. Connect the pressure source to the test manifold(s) on
the end tank(s).
(See FIGURE 3-3 and FIGURE 3-8.)
3.6.3.2. Pressurize the end tank(s) to 5 psig [3 psig for a
12-foot-diameter tank]. Allow the pressure to stabilize by adding
or removing air as necessary.
3.6.3.3. Close the air-supply valve on the test manifold.
Disconnect the air-supply line.
3.6.3.4. Soap the exterior of all compartments of the end
tank(s), checking for leaks.
(Follow instructions in Points 3.1.6.
through 3.1.8.,
including Warnings following 3.1.8.)Watch for
active air bubbles, which indicate a leak. Pay special attention to
fittings and manways.
3.6.3.5. Monitor the pressure for one hour.
3.6.4. TEST OF DOUBLE-WALL BULKHEAD(S)
3.6.4.1. Install a 4-inch NPT plug with a 0-15 psig gauge (1/4-lb.
or 1/10-lb. increments) into all monitor fittings leading into the
double-wall bulkhead(s).
(See FIGURE 3-9.)
3.6.4.2. Closely monitor all these gauges for any pressure
increase.
3.6.5. EXTERNAL SOAP TEST
3.6.5.1. Soap the entire exterior of the tank, checking for leaks.
(Follow instructions in Points 3.1.6. through 3.1.8.,
including
