clamp rated min. 1500 lb. Crimp tool and plastic spacer
between band and tank are needed.
Band Ends – CR metal D-ring or bow shackle sized
for metal band width and added to loop ends prior to
crimping, rated min. 1500 lb.
AND
Turn Buckle – CR Steel Turnbuckle (eye/hook or 2X
hook) min. 3/8" diameter w 3/8" opening/loop space rated
for at least ½ the buoyant force.
OR
Quick Link – CR Steel Quick Link w threaded closure
min. 1/4" diameter w 3/8" opening/loop space rated for at
least ½ the buoyant force.
National Oilheat Research Alliance 63
deep rated for at least
½ the buoyant force.
Design C1 or C2
(Fig. 9 & 10) – Earth
Auger Photos detail of
earth auger options for
casting in new concrete
slabs and connection
to hold-down and
connection options.
4 required-each
Fig 9. Thirty inch anchor at 450 angle
positioned +/- 4" off leg/support centrally.
Earth Auger – CR steel min. 1/2" diameter shaft and
with auger screw and eye end with approx. 4-6" eye
end bent vertical after installation to connect with hold
down brackets.
Grainger 4LVK4 or equiv 30" long with 3" diameter
auger screwed in earth under slab at a 45 degree angle,
from horizontal, minimum 24" deep.
Fig. 10. 40" length and 30" length earth augers
OR
Grainger 4LVK5, 40" long with a 4" diameter auger
screwed in earth under slab at a 60 degree angle, from
horizontal, minimum 34" deep.
Design D1 or D2 (Fig. 11, 12 & 13) – Wire Rope or
Metal Band and Connection Option Photos details of
rope and band options cut to size for tank height and
fitted with loops at each end for connection through turn
buckle and/or quick link as needed for the designs used.
Wire Rope (Fig.11) – Dayton Model 2VJN6 Coated
Steel Cable (Granger Item # 2VJN6) or equivalent 1/4"
diameter galvanized steel 7 x 19 strand w UV resistant
vinyl jacket rated min. 1400 lb.
Rope Ends – CR metal fittings with thimbles sized
for wire rope diameter and secured by (a) steel cable
Fig. 11. CR metal wire rope with u-clamps and quick link
U-clamp or (b) metal crimp sleeve rated min. 1400 lb.
OR
Metal Band (Fig 12) – Band-It Model C206BB Steel
Band Kit (Granger Item # 13E234) or equivalent
3/4" W x .030" thick stainless steel band and crimp
Fig. 12. CR metal band & Clamp with D ring and turnbuckle
Fig. 13. Installer performing wire rope tie-down.
5
ADDITIONAL PRECAUTIONS
When installing hold down systems, additional
precautions include, but are not limited to:
• Checking with the tank manufacturer to
see if anchoring recommendations are
available for your specific tank type, size
and installation.
• Checking to ensure gas or power lines are
not in the area of planned earth augers, or
if digging is required for the concrete slab.