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) - Edwards STP-L301 Series Instruction Manual

STP-L301/L451 Series Instruction Manual
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 eight screw-holes for legs or all eight 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).
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

Claw Clamps
Secure the base
(When Securing the Inlet Port Flange with Claw Clamps)
Size of Flange
ISO 160 or less
ISO 200 to 250
ISO 320 or more
Vacuum
Equipment
Figure 4.6 Example of Securing the STP Pump
4-10
Number of Claw Clamps
4 or more
6 or more
8 or more