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3. Boiler Mountings

3. Boiler Mountings. Rajan Bhandari. Objectives. Identify major mountings fitted on a boiler. Explain the significance of each of the mountings. Interpret the relevant class regulations Identify the various components of a gauge glass and safety valve.

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3. Boiler Mountings

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  1. 3. Boiler Mountings Rajan Bhandari

  2. Objectives • Identify major mountings fitted on a boiler. • Explain the significance of each of the mountings. • Interpret the relevant class regulations • Identify the various components of a gauge glass and safety valve. • Describe the constructional features of various basic types of gauge glasses and safety valves. • Explain the procedure for gauge glass blowing through. • Explain the procedure for setting a safety valve’s set pressure and blowdown. • Discuss the maintenance procedure for safety valve assembly.

  3. overview Mountings are crucial without which the operation of boilers is unsafe. Proper maintenance and care of the mountings is important for the safety of both the boiler and the personnel and to maintain optimum operating condition of the boiler.

  4. List of mountings • Safety valves • Water level indicators • Water level controller • Water level alarms & cut-out assembly • Remote water level transmitter • Main steam outlet valve • Pressure gauge & Pressure switches • Feed water valves • Burner assembly • Air vent • Water sampling valve • Manholes, mudholes & peepholes • Bottom blowdown valve • De-foaming (scum) valve • Furnace drain valve • Soot blowers

  5. Mountings

  6. Nameplate

  7. Lowest visible water level 51mm Lowest permissible water level 25mm Heating surface Gauge glass

  8. Gauge glass

  9. Gauge glass

  10. Low water level cutout failure

  11. Level switch and Alarms

  12. Safety valves- Definitions • Set Pressure: The boiler pressure at which the safety valve begins to lift. • Closing Pressure: The boiler pressure at which the valve closes. • Valve lift: The axial valve disc travel from closed to the open position. • Blowdown: The difference between the opening and the closing pressures.

  13. Safety valve set pressure

  14. Full lift safety valve

  15. Full Lift = L= D/4

  16. Two step lifting action

  17. Manhole door

  18. Summary • major mountings fitted on a boiler. • significance of each of the mountings. • Identify the various components of a gauge glass and safety valve. • Describe the constructional features of various basic types of gauge glasses and safety valves. • Explain the procedure for gauge glass blowing through. • Explain the procedure for setting a safety valve’s set pressure and blowdown. • Discuss the maintenance procedure for safety valve assembly.

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