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5.1 Torques
All nuts and bolts used for the installation must be made of
stainless steel.
Use grease, alu-paste, together with a spring washer or locking
nut. Otherwise, use Loctite or a similar product for lubrication and
locking.
Tighten all nuts and bolts to the following torques:
Size
1/4" (M6)
5/16" (M8)
7/16" (M10)
1/2" (M12)
5/8" (M16)
3/4" (M20)
5.1.1 Anchor bolts
Anchor bolts used for mounting components in concrete must
have the following pull-out strength:
Size
1/2" (M12)
5/8" (M16)
5.2 Positioning of mixers and flowmakers
Correct positioning of mixers and flowmakers is essential to
ensure trouble-free operation and long life.
5.2.1 Mixers
Submerge the mixer as deeply as possible.
•
Place the mixer in such a way that you obtain a good mixing of
the liquid in the entire tank. If more mixers are installed in the
same tank, the mixers must not generate opposite flows.
•
The distance between the propeller tip and the bottom of the
tank, H
in fig. 3, must be half of the propeller diameter.
MIN
•
SMG: The distance from the propeller tip to the liquid surface,
H
in fig. 3, must be at least equal to the propeller
ABOVE
diameter.
•
SMD: The distance from the propeller tip to the liquid surface,
H
in fig.
3
must be at least 1.5 times the propeller
ABOVE
diameter.
•
The distance between the propeller tip and the wall behind the
mixer, L
in fig. 3, must be at least 1.5 times the propeller
MIN
diameter.
Bolts
ASTM F593 (V/W)
[lbf (Nm)]
6.5 (8.8)
15.8 (21.4)
32.5 (44)
54.6 (74)
135 (183)
273 (370)
Pull-out strength
[kipf (kN)]
1.35 (6)
3.15 (14)
L
MIN
Fig. 3
Positioning sketch for mixers
5.2.2 Flowmakers
Submerge the flowmaker as deeply as possible.
•
The distance between the propeller tip and the bottom of the
tank, H
in fig. 4, must be 20 in (50 cm).
MIN
•
The distance from the propeller tip to the liquid surface,
H
in fig. 4, must be at least 0.75 times the propeller
ABOVE
diameter.
•
The distance between the propeller tip and the wall behind the
flowmaker, L
in fig. 4, must be at least twice the propeller
MIN
diameter.
•
The sideways distance between the propeller tip and the tank
wall must be at least 1.6 ft (0.5 m).
•
If more flowmakers are to be installed in parallel, the distance
between their propellers must be larger than half the propeller
diameter.
•
The distance from a bend in the channel to the propeller and
from the propeller to aeration areas must be at least the larger
value of channel width and water level.
Fig. 4
Positioning sketch for flowmakers
L
MIN
7
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