What is hogging ejector?

Answer 1

First is the "hogging ejector," which I prefer to call the "start-up ejector" because I think it is more descriptive of what this does. It is usually a large and rather inefficient brute-force ejector used to pull vacuum quickly on a process vessel. Once vacuum is attained, this ejector is shut off and taken off-line. The vacuum is maintained by the "holding" system. The hogging - or start-up- ejector is usually used in a batch process or on a steam turbine, an application where it is important to get the main vacuum system on-line quickly. Hogging ejectors are usually single-stage, but they have also been built as two- and even three-stage non-condensing systems.