Water Level Indicator | Boiler Mounting and Accessories

Water Level Indicator | Boiler Mounting and Accessories


Boiler mountings are the devices mounted on the boiler surface for safe operation, efficient working, control steam generation and easy maintenance of the boiler.

In accordance with the Indian boiler regulation the following mountings should be fitted to the boilers.

  • Two safety valves
  • Two water level indicators
  • A pressure gauge
  • A steam stop valve
  • A feed check valve
  • A blow-off cock
  • An attachment for inspector’s test gauge
  • A man hole
  • Mud holes or sight holes

Read more : Introduction to Boilers | Classification Of Boilers

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water level indicator

Water Level Indicator


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. Where the boiler drum is situated at considerable height from the floor, the water gauge is often inclined to make the water level visible from any position. When the water being heated in the boiler transforms into steam the level of water in the boiler shell goes on decreasing. For the proper working of the boiler, the water must be kept at safe level. If the water level falls below the safe level and the boiler goes on producing steam without the addition of feed water, great damage like crack and leak can occur to the parts of the boiler which get uncovered from water. This can result in the stoppage of steam generation and boiler operation.


It is a common form of glass tube water-level gauge. A is the front end plate of the boiler. F is a very hard glass tube indicating water level and is connected to the boiler plate through stuffing boxes in hollow gun metal castings (B, C) having flanges X, Y for bolting the plate.

For controlling the passage of steam and water cocks D and E are provided. When these cocks are opened the water stands in the glass tube at the same level as in the boiler. K is the drain cock to blowout water at intervals so as not to allow any sediment to accumulate. Upper and lower stuffing boxes are connected by a hollow metal column G.Balls J and H rest in the position shown in the normal working of the gauge. When the glass tube breaks due to rush of water in the bottom passage the balls move to dotted positions and shut off the water and steam. Then the cocks D and E can be safely closed and broken glass tube replaced. M, N, P and R are screwed caps for internal cleaning of the passage after dismantling. L is the guard glass; it is tough and does not give splinters on breaking. Thus when the gauge glass breaks, and this guard glass which normally will hold flying pieces, also gives way, the pieces will not fly one and hurt the attendant

Sachin Thorat

Sachin is a B-TECH graduate in Mechanical Engineering from a reputed Engineering college. Currently, he is working in the sheet metal industry as a designer. Additionally, he has interested in Product Design, Animation, and Project design. He also likes to write articles related to the mechanical engineering field and tries to motivate other mechanical engineering students by his innovative project ideas, design, models and videos.

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