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Technical Information
To connect cooling water HS-32/NHS-35:
1
Connect all body and foreline cooling in series except the Quick Cool coil.
Connect the Cold Cap cooling coil separately (Figure 12). Refer to Table 4 for
the cooling water flow rate. Higher flows will not harm the pump.
2
If the diffusion pump is being cooled by a recirculating water system, ensure
the system is capable of:
Parallel connections should be employed when the water pressure is low or if the
discharge temperature from the pump body routinely exceeds 130 °F (54 °C).
Figure 12 HS-32/NHS-35 Cooling Water Connections
Quick Cool Coil Connection
The Quick Cool coil at the boiler plate must be connected to an open drain and the
feed line must be controlled by a separate water 3-way valve: open, closed, and
vented to the atmosphere. The drain must be below the boiler level so that it is
drained completely when the Quick Cool coil water supply is shut off and the pump
is operating.
38
Adequate cooling and heat exchange to ensure a continuous inlet
temperature of 60 to 80 °F (16 to 27 °C).
Maintaining an adequate flow rate to ensure the exit water temperature
does not exceed 130 °F (54 °C).
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High Throughput Diffusion Pumps User Manual
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