beyond the tanks. Concrete work shall be as specified in Section
03300N CAST-IN-PLACE CONCRETE.
(1) Installation: Install and backfill fiberglass reinforced
tanks as recommended by the manufacturer; backfill adjacent to the
tanks shall be pea gravel unless otherwise recommended by the
manufacturer. Backfill for steel tanks shall be sand.
(2) Placement: Set steel tanks on a bed of sand not less than
150 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
300 mm 12 inches thick and pre-shape for the 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.
(3) Slope tank toward sump not less than25 mmone inch in each 1
1/2 meters 5 feet.]
[b.
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.]
[c. Vertical Fuel Oil Tank: Provide [sand, crushed stone or fine
gravel cushion] [concrete base].]
[(1) Sand, Crushed Stone or Fine Gravel Cushion: Cover area
beneath tank with a minimum 0.51 mm 20 mil thick fuel resistant
plastic membrane. 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
150 mm 6 inches thick. Stabilize bed with an approved material
and shape to the tank bottom. Slope bed down to center sump
approximately 150 mm 6 inches for each 3 meters 10 feet of tank
radius. When in place, tank shell shall be plumb.]
[(2) Concrete base shall be as indicated and in accordance with
Section 03300N CAST-IN-PLACE CONCRETE.]
[(3) Mastic Seal: Place the mastic seal between the tank and the
concrete ring to the cross section indicated. Compact the mastic
thoroughly. Immediately before placing the mastic, coat the tank
surfaces to be in contact with the concrete ring with a coat of
AASHTO M 118 bituminous material.]
3.1.2
Piping
Unless specified otherwise, erection, welding, brazing, testing and
inspection of piping shall be in accordance with ASME B31.1 and Section
15216N WELDING PRESSURE PIPING. Piping shall follow the general
arrangement shown. Cut piping accurately to measurements established for
the work. Work piping into place without springing or forcing, except
where cold-springing is specified. Piping and equipment within buildings
shall be entirely out of the way of lighting fixtures and doors, windows,
and other openings. Locate overhead piping in buildings in the most
inconspicuous positions. Do not bury or conceal piping until it has been
inspected, tested, and approved. Where pipe passes through building
SECTION 15511N
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