Petroleum and Chemical Storage Tanks - page 58

Hold-down Strap
(with neoprene liner)
Hole in
angle for
anchor bolt
6" Minimum Approved Bedding Material*
(Contact factory if using more than 12")
Anchor Bolt*
Reinforced Concrete Anchor Pad*
58 •
Steel Hold-Down Straps
This guide provides information about
Steel hold-down straps manufactured
specifically by Highland Tank. The
guide references dimensions of
standard underground tanks. Also
referenced are hold-down strap
specifications, recommended quantity,
spacing and anchor bolt requirements.
Contractor-supplied anchor bolt sizes
must be in accordance with this guide
for proper fit and system performance.
This guide is intended only as an aid to
professional engineers. Highland Tank
recommends that underground storage
tank anchorage systems be designed
by a licensed professional engineer.
A. Steel Hold-Down Straps
Steel hold-down straps are
manufactured from mild-carbon steel
with an adjustable turnbuckle and
angle clip on each end for securing
tanks in place. Neoprene rubber liners
are supplied for electrical isolation and
coating protection. Standard straps are
sized so that when the turnbuckles are
completely closed, there will be six (6")
inches between the anchor pad and
the tank bottom. Turnbuckles can
be opened to allow up to twelve (12")
inches of clearance.
B. Safety Hold-Down Straps
Safety hold-down straps are designed
to avoid having installation personnel
in the excavation during tank
placement. They are manufactured in
two pieces and shipped connected
with a threaded tie rod at top center.
These straps are designed to be
installed before placing the tank in
the excavation. By loosening the tie
rod, the two pieces are separated and
each rotated 90˚ to 180˚ away from
their original position. After the tank is
positioned, the strap’s sides are rotated
back toward each other and tightened
over the tank with the tie rod and nuts.
Due to shipping restraints, safety straps are required for tanks with a diameter of 10' or greater.
*Contractor Supplied Items
Safety Strap halves secured
together with supplied hardware
Anchor Bolt*
6" Minimum Approved
Bedding Material
(contact factory if using
more than 12")
Hold-down Strap
(with neoprene liner)
Safety Straps rotated
to 180
positioning tank
6" Minimum Approved Bedding Material*
(Contact factory if using more than 12")
Anchor Bolt*
Reinforced Concrete Anchor Pad*
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