The document outlines the various boiler mountings and accessories essential for the efficient and safe operation of a boiler. Key mountings include the water level indicator, safety valve, pressure gauge, and fusible plug, while accessories such as feed pumps and economizers enhance the boiler's efficiency. It emphasizes the functions of these components in managing water levels, steam pressure, and preventing overheating.

1. Boiler Mountings and
Accessories

2. Boiler mountings
•Devices which are used to effective functioning
of a boiler with all safety features are called
boiler mountings

3. Boiler mountings
•1. Water level indicator. (Water gauge)
•2. Main steam stop valve.
•3. Pressure gauge.
•4. Feed check valve.
•5. Fusible plug.
•6. Blow down valve. (Blow off cock)
•7. Safety valve.

4. Blow-Off Cock
•The function of blow-off cock
is to discharge mud and other
sediments deposited in the
bottom most part of the
water space in the boiler.
•It can also be used to drain-
off boiler water

5. Fusible Plug
•It is used to protect the
boiler against damage due
to overheating caused by
low water level in the
boiler.
•steam rushes into the
•furnace and puts out the
fire (stop).

6. Feed Check Valve
•It controls the
supply of water from
the boiler

7. Water Level Indicator
•It indicate the water level
inside the boiler vessel. It
shows the level in the
boiler drum.

8. Steam Stop Valve
•It regulate the flow of
steam from boiler to the
steam pipe or from one
steam pipe to the other.

9. Pressure Gauge
It indicates the
pressure of steam
in boiler.

10. Safety Valve
• Safety valves are located on the top of the
• boiler.
• They guard the boiler against the excessive
high pressure of steam inside the drum.
• If the pressure of steam in the boiler drum
exceeds the working pressure then the
safety valve allows blow-off the excess
quantity of steam to atmosphere

11. Boilers Accessories
• Parts required for steam boilers for their
proper operation and to increase the
efficiency of the boilers

12. Boilers Accessories
(1)Feed pump
(2) Injector
(3) Economiser
(4) Air preheater
(5) Superheater
(6) Steam separator
(7) Steam trap

13. Economiser
“A Device , which increases
the temprature of feed water
using waste heat of flue gases
leaving the boiler through
chimney

14. Steam Super heater
A superheater is a device used to convert saturated steam or wet steam into
superheated steam

15. Air Preheater
Pre heat the air

16. Feed Pump
•The feed pump is a pump which is used to deliver
feed water to the boiler

17. Deaerator
A deaerator is a device that
removes oxygen and other
dissolved gases from liquids.
Deaerators are commonly used
to remove dissolved gases in
feedwater for steam-generating
boilers.

18. Injector
• Force the feed water into the boiler drum

19. Steam Separator
A Steam separator is a device for separating water
droplets from steam.
Stationary boilers impart a "spin" to the steam
so that water droplets are thrown outwards by
centrifugal force

20. Steam Separator
It consists of inlet and outlet steam pipes, baffles and
water drain cock.
The steam enters at the inlet pipe
and flows down it strikes the baffles as a result it gets
deflected but as the water particles have the grater
weight , inertia and density falls to the bottom of the
separator as a result steam and water are separated.