8.3.1.4. Omit Point 8.2.8.
FIGURE 8-3
8.3.2. Cover depth must meet minimum depth
specified in
SECTION 5
of this Installation Manual.
8.3.3. Completely ballast the tank once backfill is even with the
top of the tank.
9. POSTINSTALLATION TESTING
Do not use air pressure to test tanks that contain or have
contained flammable or combustible liquids or vapors. The
fuel and air mixture could explode and cause death or
serious injury. Tanks should be air tested before ballasting.
If product is used as ballast, exercise special care in handling.
Safeguard against sparks, fire or product spills. Improper
handling of product could cause a fire or explosion, and
death or serious injury.
9.1. GENERAL
9.1.1. After backfill is brought to the top of the tank, take a
measurement of the internal diameter of the tank as a deflection
check.
(See SECTION 14 of the Installation Manual
for
instructions on taking diameter measurements.)
9.1.2. After the internal diameter of the tank has been measured
and vertical deflection is determined to be within the limits
specified by Xerxes
(See table in Tank Installation Checklist,
Section 4.),
the tank must be pressure tested to ensure that no
damage occurred during installation.
9.1.3. Follow the procedure
in SECTION 3
, soaping all exposed
areas of the tank and all fittings, and monitoring the pressure for
one hour.
9.1.4. Carefully relieve the pressure in the tank. Remove the
quick-disconnect assembly from dry double-wall tanks.
12"
Do not strike the tank with the probe or tank damage may
result.
FIGURE 8-1
FIGURE 8-2
8.2.11. Repeat Point 8.2.10. with a second 12-inch lift.
8.2.12. After the second lift of material has been placed and
worked under the tank, bring the backfill to the top of the tank.
8.3. WET-HOLE INSTALLATION
8.3.1. Follow the dry-hole installation procedure with the
following modifications:
8.3.1.1. Before performing Point 8.2.1. of the dry-hole installa-
tion, take a measurement of the internal diameter of the tank
before the tank is placed in the excavation hole.
(See SECTION
14 of the Installation Manual
for instructions on taking diameter
measurements.) Record this measurement as Initial Internal
Diameter on the Tank Installation Checklist, Section 4.
8.3.1.2. Before performing Point 8.2.1. of the dry-hole installa-
tion, pump the water from the hole and continue pumping to
maintain minimum water level during tank installation.
8.3.1.3. During Point 8.2.2. of the dry-hole installation, when
setting and leveling the tank, partially ballast the tank until it
settles firmly on the prepared bed. The ballast level in the tank
must never exceed the water level in the hole by more than 1 foot
until the backfill reaches the top of the tank.
(See FIGURE 8-3.)
Wrong
Right
18
