From ThomasNet: Vooner offers conical port liquid ring vacuum pumps for removing non-condensable gases from condensers. The VTS Series of two stage liquid vacuum pumps are commonly used for removing gases under normal condenser operating conditions to 1.0"HgA or lower while providing greater low vacuum capacity to assist with hogging or handle upset conditions.
The VG and V4 Series' of single stage liquid ring vacuum pumps with capacities to 13,000 ACFM are commonly used in condenser hogging applications and available in stainless steel construction for geothermal condenser service.
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Liquid Ring Vacuum Pumps for Power Plants