Steam jet ejector is a device that uses the energy in a steam jet to compress vapors. Steam jet ejectors are commonly used for producing vacuum by removing non condensable gases. They are connected in parallel to handle quantities of gas or in series to develop lower levels of vacuum. It utilizes high pressure steam to compress low pressure vapours or gases. This creates a vacuum in a vessel or chamber to which the ejector is connected. Steam at pressure expands through a nozzle and exits at very low pressure and at very high velocity. They have no moving parts and can be fabricated out of a large range of materials. They can be used for pumping highly corrosive, abrasive, and difficult to handle materials. The smooth, open flow passages permit them to handle entrained solids and liquid slugs without damage.