Between which two components does a siphon provide a protective water seal for boiler instrumentation?

Between which two components does a siphon provide a protective water seal for boiler instrumentation?

• A. Boiler Drum And Steam Gauge
• B. Feedwater Pump And Boiler Drum
• C. Boiler Inlet And Outlet
• D. Steam Drum And Superheater

Answer: (A)

The protective water seal for boiler instrumentation is provided by placing a siphon between the boiler drum and the steam gauge. A siphon is a short U-shaped tube filled with water that acts as a barrier. One end taps the boiler drum (where the pressure is to be measured) and the other end connects to the pressure gauge. The water in the bend blocks hot live steam from reaching the gauge while still transmitting the steam pressure through the liquid column. This keeps the gauge protected from high temperatures and direct steam, helping prevent damage and ensuring a stable, accurate reading. Other locations wouldn’t shield the instrument in the same way, so they aren’t used for this purpose.

The protective water seal for boiler instrumentation is provided by placing a siphon between the boiler drum and the steam gauge. A siphon is a short U-shaped tube filled with water that acts as a barrier. One end taps the boiler drum (where the pressure is to be measured) and the other end connects to the pressure gauge. The water in the bend blocks hot live steam from reaching the gauge while still transmitting the steam pressure through the liquid column. This keeps the gauge protected from high temperatures and direct steam, helping prevent damage and ensuring a stable, accurate reading. Other locations wouldn’t shield the instrument in the same way, so they aren’t used for this purpose.