Using oil sight glass level indicators

Sight glasses are used in many applications across a range of industries all over the world. An oil sight glass is explicitly used to measure oil within a pipe, tank or vessel in a safe way, negating the need to open the oil receptacle, which could put the observer at risk. In this article, BM Engineering explores the different types of oil sight glass level indicators and how they work, giving you a deeper understanding of this simple, yet essential tool in the oil processing industry.


What is an oil sight glass?


A sight glass is a transparent tube that is used for observing the level of liquid contained within a tank or boiler. an oil sight glasses is useful for monitoring oil or lubricant quality and quantity inside pipes, tanks and reservoirs. As well as monitoring how much lubrication is inside the component, oil sight glasses can also show you the quality of the lubricant in question. This includes the colour, clarity, and if there has been an accumulation of water.


Oil sight glasses are used across many industries, including:


  • – Manufacturing plants
    – Chemical
    – Food and beverage
    – Biofuels
    – Pharmaceuticals


When choosing an oil sight glass there is a variety of materials available, allowing different fluids or levels of pressure. In general, an oil sight glass comes in two different styles: columnar and bullseye.


Columnar oil sight glass


A Columnar oil sight glass is typically made of plastic, acrylic or glass and allow visualisation of the oil level fluctuating up and down. They are typically attached to an oil-bathed component, usually at the drain port. Columnar sight glasses are recommended for use when the levels of oil within the container are likely to fluctuate by large amounts.


Bullseye oil sight glass


A Bullseye oil sight glass is made of similar materials to columnar sight glasses and are placed into a port, sitting just above the oil level inside the reservoir. 3D bullseye sight glasses are also available to give industries a better view of what the oil level is within the oil receptacle.


How does an oil level sight glass work?


Once installed, sight glasses work as a window enabling the user to observe processes inside tanks, pipes, reactors and vessels. Oil level indicators can be used in conjunction with sight glasses to measure the exact level of an oil or lubricant within a vessel.


BM Engineering – sight glass suppliers


As one of the UK’s leading industrial sight glass suppliers, BM Engineering can help find the solution you require for your process industry. With over twenty years of experience, our family-run business puts the customer at the heart of everything we do.


We hold a range of sight glasses from world-leading sight glass manufacturers INOXPA and Valsteam ADCA as well as many other industrial valves, actuated packages and instrumentation for your oil processing industry.


Get in touch with us today to find out more.