Circulation Oil: What You Should Know

Circulation oils are multi-purpose oils specially formulated to offer outstanding lubrication, flawless performance, and maximum efficiency.

Some key advantages include excellent oxidation and thermal stability, essential for decreasing deposit formation and reducing downtime.

Also, this oil comes to lubricate and protect components, devices, and machines that work at high temperatures. Due to special anti-corrosion, and water-resistance properties, these oils are suitable for wet environments.

What Is Circulation Oil Used For?

These premium-quality mineral oils are mixed with selected additives in circulating systems and other industrial applications.

Besides, these oil systems offer a continuous lubricant flow to bearings, gearboxes, and blowers. They lubricate tools to pump stormwater and transform fresh air in mines. They also can extract oil, make power ships and paper or chemicals, and test military components.

You can use this oil for engine circulation systems, Roll-neck bearings, and oil lubricated plain. You can use them as general-purpose oils, hydraulic fluids, and industrial gear lubricants.

Oil Circulation System In Engine:

A circulating oil system is cost-effective because it provides optimal longevity in heavy, oversized, and high-speed bearings. Basically, it’s mainly formulated for cooling, and proper lubricating oil filtration spreads throughout the system.

There are predefined circulating oil systems available in the market. One can custom-make it depending on the requirement. Nevertheless, you can adapt it according to operational capabilities.

Primary Requirements For A Circulating Oil System:

Following are some of the critical factors that you need to consider to achieve an effective circulating oil system carefully:

  • Pressure –

The standard operating pressure is usually about 30 to 35 psi. But for the circulation system, you may need a customized application. Make sure you will adjust the stress and get higher output if required.

  • Flow Rate-

Accordingly, it’s essential to have an acceptable flow rate in place. Align the flow rate to what the bearing requires. This will result in a controlled flow rate.

  • Filtration –

Primarily, there are filtration players needed. First, a baffle is put onto the reservoir to separate the sides. This allows the residue to transform to one side and the oil to flow to the other.

When the fluid exits the reservoir, a mesh strainer filters it further. Final filtration occurs just before the oil leaves the system with a 23-micron filter. Ensure all essential equipment is cleaned, and the filter is replaced regularly.

  • Pumps and Motors –

There are motors with different voltage outputs and frequencies to get the best power results.

  • Gauges –

Gauges allow you to monitor operating performance continuously. This pressure gauge is beneficial for checking if the pump is working correctly.

  • Heat Exchangers –

The heat exchanger’s primary use is to reduce the temperature of the oil before it goes to the bearings. Heat exchangers are critical because they transfer heat from fluid to air or water.

  • Immersion Heaters –

The main job is to ensure that this system begins without any hiccups when the temperature is cold. In addition, when it freezes outside, this system requires it to work efficiently and without problems.

  • Environment –

Before designing the system, factors such as temperature, humidity, and other essential conditions must be considered.

Circulating Oil Lubrication Systems

A circulating lubrication system is a closed circuit that guarantees endless lubricant support. Even this system gives a surety of constant lubricant flow and a lubricant returns. A predetermined lubricant flows to the lubrication point, pumped back into the lubricant tank, and returns to circulation.

The lubricating process is repeated for all connected lubrication points until the pump delivers lubricant to the lubricant distributor. The lubrication system is often realized with lubricating oil. Lubricating oils contain higher viscosity and are more suitable for lubrication than grease. The most known example is the 4-stroke bicycle engine.

These circulating lubrication systems primarily consist of below types of equipment:

  • Lubricating Tank

It’s a reservoir for lubricants, an example grease and oil.

  • Lubricant Pump

The pump absorbs the lubricant from the Tank through the distributors to the lubrication points.

  • Progressive Distributor

The lubricant distributor delivers lubrication points in dynamic order with lubricant. Actually, it consists of active metering and line elements. All elements can combine into one component.

  • Pipe Work

Pressure pipeline to delivers the lubrication point with the needed quantity of lubricant. On the other hand, the pipeline needs to return the oil to the Tank. High-pressure hoses must be sized according to pressure and flow rate.

  • Control and Cooling Devices

Manufacture pressure gauges and universal regulators, and control the flow rate, pressure, and lubricant level in the cooling Tank. A cooling aggregate can enter to lubricate and cool the lubrication points.

  • Filter and Other Accessories

Cleaning tools like filters are needed to remove the impurities before the lubricant sucked back into circulation. Depending on the application, a cooling aggregate can still insert

It would help if you cleaned the work area before refilling the Tank. The system of closed lubrication circulation needs fewer lubricants. Lubricant reuse and low loss rate contribute to environmental protection.

Circulation Oil Vs. Gear Oil

Circulating systems have to perform in a variety of conditions. That’s why it’s essential to have a lubrication solution that works consistently, no matter the needs. So, the long-life circulating oils reduce deposits.

Yet, they protect your system from wear, contamination, and corrosion. Most importantly, they can help you to enhance your phone and operations productivity.

In contrast, gear oil is much thicker than circulation oil. With a high viscosity, gear oil can ensure connected gears are often lubricated and cushioned.

Manual gearboxes make enhanced amounts of friction and generate large amounts of heat. For that reason, gear oils especially come to tolerate high temperatures and safely transfer heat from the gearbox.

Oils must be able to perform effectively under extreme pressure. So, ideally, gear oil provides the best performance in low and high temperatures. So there are many differences between circulation oil and gear oil. In a word, you can use gear oil as a circulation oil.

Hydraulic Oil Vs. Circulation Oil

Accordingly, hydraulic oil is best for the hydraulic system. On the contrary, using circulation oil is suitable for circulating systems. Hydraulic oil is primarily best for hydraulic equipment. But you can use it in other applications where you need excellent lubrication, providing better oxidation stability.

The base oil and additives allow the BP hydraulic range to use in lightly loaded gears. Furthermore, you can use it as a circulating oil in applications where rust and oxidation-inhibiting oil is needed.

The range is entirely compatible with elastomer equinoxes mainly used for static and dynamic seals. So, you can use hydraulic oil instead of circulation oil if you get an emergency.

Final Word

In summary, circulating oil systems are typically used for heavily loaded bearings operating at high temperatures. Ultimately, you can use it in highly corrosive and dirty environments. All circulating oil systems are quoted indeed to customer requirements.

Well, this is all about circulation oil and the circulation oil system. We hope you can get essential information from here.


I am Engr. Z Eusuf Lubricant Specialist, Mechanical Engineer & has been working with engine lubricants for a long time and knows what makes them work best. I can help you find the right oil for your needs, and I have tips on how to keep your engine running at its best.