Boiler Mountings and Accessories

@ishan-nohePN • Oct 24, 2024

Oct 24, 2024

2.0K

Boiler mountings are the machine components that are mounted
over the body of the boiler itself for the safety of the boiler and for
complete control of the process of steam generation.
Various boiler mountings are as under:
1) Pressure gauge
2) Water Level Indicator
3) Fusible plug
4)Safety Valve
i) Lever Safety Valve
ii) Spring Loaded safety Valve
5) Steam stop valve
6) Feed check valve
7) Blow off cock

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ISHAN TOPRE

@ishan-nohePN • Jan 23, 2011

3.Bourdon's pressure gauge.
Function:
1.To record the steam pressure at which the steam is generated in the boiler.
2. A bourdon pressure gauge in its simplest form consists of elliptical elastic tube bent into an arc of a circle
3. This bent up tube is called as BOURDON’S tube.
4. One end of tube gauge is fixed and connected to the steam space in the boiler.
The other end is connected to a sector through a link.
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ISHAN TOPRE

@ishan-nohePN • Jan 23, 2011

2) Water Level Indicator
• The function of water level indicator is to indicate the level of water in the boiler constantly.
• It is also called water gauge.
• Normally two water level indicators are fitted at the front end of every boiler.
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ISHAN TOPRE

@ishan-nohePN • Jan 23, 2011

3) Fusible plug
• Function: To extinguish fire in the event of water level in the boiler shell falling below certain specified limit.
• It protects fire tubes from burning when the level of the water in the water shell falls abnormally low and the fire tube or
crown plate which is normally submerged in the water, gets exposed to steam space which may not be able to keep it
cool.
• It is installed below boiler's water level.
• When the water level in the shell falls below the top of the plug, the steam cannot keep it cool and the fusible metal
melts due to over heating. Thus the copper plug drops down and is held within the gunmetal body by the ribs. Thus the steam space gets
communicated to the firebox and extinguishes the fire. Thus damage to fire box which could burn up is avoided.
• By removing the gun metal plug and copper plug the fusible plug can be put in position again by interposing the fusible
metal usually lead or a metal alloy.
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ISHAN TOPRE

@ishan-nohePN • Jan 23, 2011

4)Safety Valve
Function : The function of safety valve is to release the excess steam when the pressure of steam inside the boiler exceeds
the rated pressure.
There are 4 types of safety valves:
i) Lever Safety Valve
The disadvantage of this valve is that it admits of being tempered with, and the effect of
a small addition to the weight is magnified considerably in its action on the value.
ii) Spring Loaded safety Valve
• For locomotives and marine engines both the lever and dead weight types are unsuitable for obvious reasons,
and the valve must be spring loaded, as such valve is unaffected by vibration or deviation from the vertical.
• Disadvantage :
One disadvantage of this valve is that the load on the valve increases as the valve lifts, so that pressure required
just to lift the valve is less than that required to open it fully.
iii)Dead Weight Safety Valve
• It is mainly used for low pressures, low capacity, stationary boilers of the Cornish and Lancashire types.
• Merits:
1)Simplicity of design
2)Gives quite a satisfactory performance during operation.
3)It cannot be easily tempered from the pressure adjustment view.
• Demerits:
1)Unsuitable for use on any boiler where extensive vibration and movement are experienced( e.g. locomotive and marine work).
2)It is not suitable for high pressure boilers because a large amount of weight is required to balance the steam pressure.
iv) High steam and low water safety valve
• It serves the following purposes.
(i) The steam automatically escapes out when the level of water falls below a certain level.
(ii) It automatically discharges the excess steam when the pressure of the steam rises above a certain pressure.
Use : It is generally used on Lancashire or Cornish boiler.
It cannot used in mobile boilers.
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ISHAN TOPRE

@ishan-nohePN • Jan 23, 2011

5) Steam stop valve
• A valve is a device that regulates the flow of a fluid (gases, fluidized solids, slurries, or liquids) by opening,
closing, or partially obstructing various passageways.
• Function: to shut off or regulate the flow of steam from the boiler to the steam pipe or steam from the steam
pipe to the engine.
• When the hand wheel is turned, the spindle which is screwed through the nut is raised or lowered depending
upon the sense of rotation of wheel. The passage for flow of steam is set on opening of the valve.
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ISHAN TOPRE

@ishan-nohePN • Jan 23, 2011

6) Feed check valve
Function: The function of a feed check valve is to control the supply of water
to the boiler and to prevent the escaping of water from the boiler when the pump pressure is less or pump is stopped.
i) To allow the feed water to pass into the boiler.
ii) To prevent the back flow of water from the boiler in the event of the failure of the feed pump.
The feed check valve is fitted in the water space of the boiler slightly below the normal level of the water.
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ISHAN TOPRE

@ishan-nohePN • Jan 23, 2011

7) Blow off cock
• Function: To drain out the water from the boiler for internal cleaning, inspection, repair or other purposes.
• It may discharge a portion of water when the boiler is in operation to blow out mud, scale or sediments, periodically.
• It is fitted on the boiler shell directly or to a short branch pipe at the lowest part of the water space.
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freak16

@freak16-XgiLj6 • Jan 25, 2011

Manhole and mud box:
Manhole provides opening for cleaning, inspection and maintenance
purpose. Mud box is a collection chamber (as shown in Babcock and Wilcox boiler) for collecting the Mud
.
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freak16

@freak16-XgiLj6 • Jan 25, 2011

@Ishu
Superb job..
Bows to you. You rock buddy.
CEans please add the other mountings to it so that we can forge a nice tutorial out of it.
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Jitul

@jitul-DEtIvQ • Jul 22, 2011

Mainly Eight (8) mountings are required and essential to a Boiler -
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. Air vent.
8. Safety valve.
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Jitul

@jitul-DEtIvQ • Jul 22, 2011

Actualy a Boiler requires Eight (8) mountings.
1. Water level indicator.
2. Main steam stop valve.
3. Pressure gauge.
4. Feed check valve.
5. Fusible plug.
6. Blow down valve.
7. Air vent. (air cock)
8. Safely valve.
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Shubham Khaire

@shubham-khaire-F0uy14 • Sep 18, 2015

hey i wanted a brief introduction of 3 mountings & 3 accessories of boilers
plz give me today itself!!!!!!
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Er Armani Singh Bisht

@er-armani-singh-H1ewzo • Sep 18, 2015

accessories are used to improve the overall efficiency of boiler. types of accessories are
1) Economizer
2 Superheater
3 pre-heater and etc
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Shubham Khaire

@shubham-khaire-F0uy14 • Sep 19, 2015

plz can i get a para for each of the above mentioned accessories!!!!
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