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Technical data
B722-40-880 Issue F
2.3 Vent gas specification and vent control data
Although the pump may be vented to atmosphere, high relative humidity of the air may greatly increase the
subsequent pump-down time. To reduce pump-down times vent with dry, clean gases. Refer to Section 3.8 for a
description of the vent options and the vent valve connection and refer to Section 4.1.3 for configuring the venting
options.
Figure 3 - Maximum allowed rate of pressure rise during venting: pressure against time (with pump initially at
full rotational speed)
Table 6 - Vent gas specification and vent control
Vent gas specification and control Reference data
Vent gas Dry air, nitrogen, argon or other inert gases
Maximum dew point at atmospheric pressure -22 °C
Maximum size of particulates 1
µm
Maximum concentration of oil 0.1 parts per million
Recommended time for rotational speed to reach 50% > 15 seconds
Maximum allowed rate of pressure rise Refer to Figure 3
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