Edwards STP-451 Series - Table 4.3 Number of Claw Clamps by Size of Flange; Figure 4.6 Example of Securing the STP Pump (When Securing the Inlet Port Flange with Claw Clamps)

STP-301/451 Series Instruction Manual
4-10
Installation
2) When securing the inlet port flange with claw clamps
Refer to Table 4.2 for rotational torque.
When securing the inlet port flange with only the claw clamp, the vacuum
equipment cannot withstand the maximum rotational torque generated by the
worst-case failure. To make the vacuum equipment withstand abnormal torque,
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.
For the claw clamp-type, use the required number of claw clamps as specified in
Table 4.3. Position the claw clamps evenly on the circumference.
Table 4.3 Number of Claw Clamps by Size of Flange
Size of Flange Number of Claw Clamps
ISO 160 or less 4 or more
ISO 200 to 250 6 or more
ISO 320 or more 8 or more
Figure 4.6 Example of securing the STP Pump
(When securing the inlet port flange with claw clamps)
Vacuum
Equipment
Secure the base
Claw Clamps