4
3.1.3. Construct a test manifold
as shown in FIGURE 3-1
. The
air-supply gauge must have a maximum full-scale reading of 15
psig with 1/4-lb. or 1/10-lb. increments, and a pressure-relief
device set at 6 psig [4 psig for 12-foot-diameter tanks].
FIGURE 3-1
3.1.4. In air tests, temperature change could be a factor in
changes in gauge readings.
Note: Multiple test manifolds will be required to test
multicompartment tanks.
3.1.5. It is the installer’s responsibility to select a thread sealant
that is compatible with the product being stored. Some sealants
cannot be used with some products. Remove, clean and redope
all factory-furnished temporary plugs with appropriate thread
sealant. Install permanent plugs in all openings where piping will
not be installed. Make sure all manway bolts are tightened, and
fitting plugs are properly doped and sealed.
3.1.6. When checking the tank for leaks during an air/soap test,
rotate the tank to check the bottom, unless it is a tank filled with
monitoring fluid.
Never rotate a tank filled with monitoring fluid. See SECTION
3.4. and SECTION 3.8. for instructions regarding these tanks.
3.1.7. Before rotating the tank during an air/soap test, place
protective material on the area on which the tank will be rotated.
Make sure the area is flat and is free of large or sharp objects,
such as rocks, which may damage the tank.
3.1.8. Rotate the tank slowly and carefully to avoid developing too
much momentum. Momentum can grow because fittings on top of
the tank make it top heavy. Make sure the tank’s fittings and
manways never touch the ground. Do not rotate the tank more
than 120° from the initial starting point.
Always secure the tank before moving or lifting it. This is
commonly done by connecting a crane or backhoe to the
lifting lugs. Failure to do so could result in death or serious
injury.
From Air Supply
Air-Supply
Valve
Air-Supply
Gauge
Service Fitting
Pressure-Relief
Device
FIGURE 2-2
2.1.3.3. Do not wrap chain or cable around the tank.
2.1.3.4. Use guy ropes to guide the tank when needed.
2.1.3.5. Do not roll the tank to move it.
2.1.3.6. If the tank has a bottom sump or fitting, take extra care
that the tank does not rest or roll on the bottom sump or fitting
prior to installation.
2.1.4. Whenever a tank is stored at the site, chock it in place to
prevent rolling.
(See FIGURE 2-3.)
Tie the tank down if high
winds are expected.
FIGURE 2-3
3. PREINSTALLATION TESTING
3.1. GENERAL
3.1.1. Xerxes tanks are tested prior to shipment, but the tank
must be retested at the site prior to installation – even if shipped
with vacuum – in order to verify the absence of shipping and
handling damage.
3.1.2. The tester is responsible for verifying that all of the test
equipment is in good working condition, and is properly
configured and calibrated.
Tie
Downs
Tires
Tank
Sandbags
Top of tank in upright positon
Lifting lugs to be
used when tank is
in upright positon
Top of tank in rotated position on truck
Top of tank in rotated position on truck
Lifting lugs to be
used when tank is
in rotated positiion
