🔍 Key Concepts
• Study how the main steam line branches off to supply the soot blowers, air ejectors, and whistle.
• Notice the symbols for pressure-reducing valves and desuperheaters (often numbered boxes like 4, 5, 6, 7, 8) and which consumers are downstream of them.
• Compare the steam pressure labels at the circled letters (A, H, I, K, etc.) to see which equipment shares the same pressure and whether the steam is desuperheated or not.
💭 Think About
• Trace the line that feeds the soot blowers from the boilers: does it pass through a desuperheater or a pressure‑reducing station before reaching point A?
• Follow the piping from the main steam header to the air ejectors (Main and Aux). Which numbered station do they receive steam from, and what pressure is indicated there?
• Look at the branch going to the steam whistle symbol. Is it taken from the same reduced‑pressure line as the ejectors, or from a different pressure level? What pressure is marked at that point?
✅ Before You Answer
• Verify exactly what pressure is indicated at the air ejector supply points (letters H and I) and compare it to 143 psi.
• Check whether the soot blower branch is shown coming off the desuperheated steam line (label G) or directly from the high‑pressure main steam header.
• Confirm the pressure label at the whistle connection (near letter K) and whether that pressure matches 140 psi or some other value.