STP-301/451 Series Instruction Manual 
 
4-11
Installation 
3)  When installing the damper in the inlet port flange 
 
Refer to Table 4.2 for rotational torque. 
In case of using a damper, secure the base with all 8 screw-holes for legs or all 8 
attached legs. Follow "CAUTION" on page 4-8 about legs and bolts for securing the 
base. 
When the base cannot be secured because of the equipment design, install the pump 
with a torque restraint like the one shown in Figure 4.7 (b). 
 
 
◇  Use a damper only at the vertically upright position. 
◇  DO NOT remove the bolts and nuts attached to reinforce the damper. 
 
 
(a) When securing the base    (b) When installing not to rotate 
Figure 4.7    Example of securing the STP Pump 
(When installing the damper in the inlet port flange)
 
Damper Clamps
Secure the base
Hole to prevent
from rotating
Leg