out of plumb per 15 meters 50 feet. Remove roughness, marks, and lifting
lugs, from stack and grind surfaces smooth and flush with surrounding
surfaces.
[3.1.1.5
Horizontal Fuel Oil Tanks (Below Ground)
**************************************************************************
NOTE: Choose this subparagraph or the subparagraph
below, entitled "Horizontal Fuel Oil Tanks (Above
Ground)," or the following subparagraph entitled
"Vertical Fuel Oil Tank."
**************************************************************************
Provide concrete ballast slabs for tanks and concrete protective ground
level slabs for FPR tanks. Ballast slabs shall be full length and width of
tanks and protective slabs shall extend 610 mm 2 feet beyond tanks.
Concrete work shall be as specified in Section 03300N CAST-IN-PLACE
CONCRETE.
a.
Install and backfill fiberglass reinforced tanks as recommended by
the manufacturer; backfill adjacent to tanks shall be pea gravel
unless otherwise recommended by the manufacturer. Backfill for
steel tanks shall be sand.
b.
Set steel tanks on a bed of sand not less than 152 mm 6 inches
deep over the concrete slab and strap in place with stainless
steel hold-down straps with stainless steel turnbuckles. Set FRP
tanks on a bed of pea gravel not less than 305 mm 12 inches thick
and pre-shape for tank contours for FRP tanks. Fabricate straps
for FRP tanks from FRP resins reinforced with stainless steel to
prevent breaking of straps and floating of empty tanks.
c.
Slope tank toward sump not less than 25 mm one inch in each 1 1/2
meters 5 feet.
][3.1.1.6
Horizontal Fuel Oil Tanks (Above Ground)
Continuously support steel tank saddles along the full length of the base
and level and grout to ensure full bearing.
][3.1.1.7
Vertical Fuel Oil Tank
Provide [sand, crushed stone or fine gravel cushion] [concrete base].
a.
Sand, Crushed Stone or Fine Gravel Cushion: Cover area beneath
tank with a fuel resistant plastic membrane with a thickness of
not less than 0.51 mm 20 mils. Carefully fuse or cement plastic
membrane seams. Lay plastic over a thoroughly compacted select
subgrade free from rocks that could puncture the plastic. Over
plastic, provide a bed of sand, crushed stone or fine gravel not
less than 152 mm 6 inches thick. Stabilize bed with an approved
material and shape to tank bottom. Slope bed down to center sump
approximately 152 mm 6 inches for each 3 meters 10 feet of tank
radius. When in place, tank shell shall be plumb.
b.
Concrete base shall be as indicated and in accordance with Section
03300N CAST-IN-PLACE CONCRETE.
c.
Mastic Seal:
Place mastic seal between tank and concrete ring to
SECTION 15501N
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