🔍 Key Concepts

• Trace the steam line that supplies the Butterworth (tank cleaning) heater on diagram SG-0005. • Note which main steam header or system that line comes from (e.g., auxiliary exhaust, low‑pressure reducing station, or main steam). • Recall the typical pressure levels for main steam, auxiliary exhaust steam, and reduced/service steam on a steam plant piping diagram.

💭 Think About

• From the Butterworth heater symbol, follow the steam supply piping backwards until you reach a clearly labeled pressure source or header. What other consumers are fed from that same source? • Compare the Butterworth heater’s supply line with the lines feeding soot blowers, air ejectors, and gland seal regulators. Do they all operate at the same pressure range, or is the Butterworth heater grouped with lower‑pressure services? • Based on where the Butterworth heater connects, which of the listed pressures best matches that type of header on a typical marine boiler plant?

✅ Before You Answer

• Verify whether the heater is supplied from the auxiliary exhaust system, a reduced‑pressure auxiliary steam line, or direct main steam. • Check any nearby labels or valve notes around the Butterworth/tank cleaning heater for indications like "aux exhaust," "from 150‑lb aux steam," or similar. • Confirm that the pressure you choose is reasonable for tank‑cleaning/Butterworth heaters (not as high as main steam to turbines, but high enough to provide effective heating and cleaning).