Installation
4. If pumping flammable, corrosive or toxic gases, connect a vent line to the pressure relief
valve port of the cryopump and direct the vented gases to a safe location.
A vent line connected to the relief valve port must maintain at least a 33 mm (1.3") inside
diameter for at least 40.1 mm (1.58") from the flange of the relief value port to prevent
restricting the gas flow. See Figure 11a.
If the vent line diameter is reduced beyond the 40.1-mm distance, provide a stop at the
transition to prevent a broken poppet from blocking the vented gas. See Figure 11b that
shows a typical stop configuration.
An aluminum vent adapter for mounting to the relief valve port provides a NW40 flange
for connecting a vent line. The optional vent adapter is SCAI P/N 260936B.
See Figure 9b.
5. The vent line connected to the vent adapter must have a minimum inside diameter of
22 mm (0.88") and a maximum length of 3.0 m (10 feet), and be connected to a vent
manifold at atmospheric pressure.
This completes the installation of the cryopump.
The system equalization pressure shown by the compressor gauge(s) after all components
have been connected will determine if charging or venting is required. See the Specifications
section in the compressor manual for system equalization pressures at different ambient
temperatures.
Figure 11a Relief Valve Vent Connection Detail
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