The main air ejectors receive their steam supply from which reducing station?

• A. 600/150-psi dry
• B. 450/60-psi wet
• C. 300/75-psi dry
• D. 700/200-psi dry

Answer: (A)

Air ejectors rely on dry steam at the right pressure to create the vacuum they need, so the steam supply must come from a reducing station that provides dry steam at an appropriate pressure. The main air ejectors are fed from the reducing station that delivers 150 psi dry steam, derived from the higher boiler pressure (600 psi). Dry steam prevents water carryover that can reduce ejector efficiency or cause damage, and 150 psi is the suitable pressure for the ejectors’ operation. Other stations offer either wet steam or different pressures that aren’t appropriate for the ejectors, so they aren’t used for this purpose.