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8 major reasons for high fuel consumption in air compressors; some of them are beyond imagination! In our daily work, we often encounter the problem of oil leakage from air compressors. Apart from quality issues with the oil itself, what other factors can cause oil leakage? Engineers have identified several causes of oil leakage through practical experience, and I would like to share them with you all. 1. The design of the oil-gas separation tank is not standard. Some air compressor manufacturers employ an unreasonable design for the primary separation system in such tanks, resulting in poor primary separation performance. This leads to a high concentration of oil mist in the oil before it enters the separation process, excessive load on the separation system, insufficient processing capacity, and consequently high fuel consumption. If you buy such a product, no matter how good your skills are, there’s nothing you can do! 2. Excessive fueling: The amount of fuel added exceeds the normal level, and some of the oil is carried away by the airflow, resulting in high fuel consumption. The simple reason is that some people are careless and don’t pay attention. 3. High air consumption; operation under overload and low pressure. Operating under low pressure means that when a user utilizes an air compressor, the exhaust pressure does not reach the compressor’s rated operating pressure, but it is still sufficient to meet the air demand of some industrial users. For example, if an industrial user adds more equipment that requires air, the air consumption increases, and as a result the compressor’s output cannot keep up with this demand. If the compressor’s rated exhaust pressure is 8 kg/cm², but the actual pressure during operation is only 5 kg/cm² or even lower, then the compressor operates continuously under load, failing to reach its rated pressure level. This leads to increased fuel consumption. The reason for this is that, with constant exhaust volume, the flow rate of the oil-air mixture increases as it passes through the oil separator, resulting in a high concentration of oil mist and increased load on the oil separator, which in turn leads to higher fuel consumption. 4. Clogged return oil pipeline: When the return oil pipeline (including the check valve on it and the return oil filter) is blocked by foreign objects, the engine oil that has settled at the bottom of the oil cannot return to the engine head. The already settled oil droplets are then blown up by the air flow and carried away along with the separated air. These foreign objects are usually caused by solid impurities that fall during installation. If the return oil check valve is damaged – that is, if it stops functioning as a one-way valve and starts allowing flow in both directions – the pressure inside the oil separator will cause a large amount of oil to flow back into the oil separator through the return oil pipe. When the machine is started up again, the oil inside the separator cannot be drawn back into the machine head in time, resulting in some of the oil escaping along with the separated air outside the air compressor. This situation is common in machines that do not have an oil circuit shut-off valve or a check valve at the exhaust outlet of the machine head. 6. Improper installation of the oil return tube: When replacing, cleaning, or repairing the air compressor, the oil return tube is not inserted far enough down to the bottom of the oil separator (it is better to keep it at a distance of 1–2 mm from the bottom of the separator); as a result, the separated oil cannot return to the compressor head in time, and the accumulated oil ends up being carried away along with the compressed air. 7 Failure of the minimum pressure valve: If there are leaks at the sealing area of the minimum pressure valve, or if it opens prematurely (as the opening pressure varies depending on the manufacturer, typically ranging from 3.5 to 5.5 kg/c㎡), the time required for the machine to establish pressure in the oil-gas tank during operation will increase. In such conditions, the concentration of gas-oil mist is high at low pressures; the flow rate of the oil mist as it passes through is fast, which increases the load on the separation mechanism and reduces its efficiency, resulting in higher oil consumption. If you have any different opinions, feel free to leave a message to discuss!