What is sight glass in tank?

A sight glass or water gauge is a type of level sensor, a transparent tube through which the operator of a tank or boiler can observe the level of liquid contained within.

How does a level sight glass work?

The principle of the reflex level indicator is based on the reflection of light. In the gas or steam phase, the light is reflected by the prismatic grooves of the sight glass so that bright indication is achieved. In the liquid phase, the light is absorbed, resulting in a dark indication of the level.

What are the 3 types of sight glass?

Types of Sight Glass

  • Bullseye. A bullseye sight glass is installed by drilling a hole in a tank at the top of the optimum oil level.
  • Columnar. These are clear, vertical tubes mounted outside tanks that allow you to see a larger sample of oil than bullseye sight glasses.
  • BS&W Bowls.
  • 3D.
  • Multifunctional.

What is sight glass level measurement?

Use of a sight glass is probably the simplest method of measuring liquid level. The sight glass is attached to the outside of the tank so that the liquid level can be seen through the glass. The sight glass is marked with graduations to allow the level to be measured.

What are the three 3 types of sight glass?

What are the types of sight glass?

There are two types of sight glasses: a conventional glass disc and a glass disc fused to a metal ring during manufacturing. The metal ring squeezes the glass and holds it in radial compression. Glass typically fails as a result of being subjected to significant tension.

Should there be bubbles in sight glass?

Bubbles in sight glass: With a restriction in the liquid line before the sight glass, bubbles are sure to occur in the sight glass. Many technicians believe that a bubbling sight glass means nothing but an undercharge of refrigerant. This is simply not true.