Causes and solutions of oil leakage from air filter port of screw air compressor

1.Causes and solutions of oil leakage from air filter port of screw air compressor

        During the operation of the screw air compressor, if the oil separation core is damaged, damaged, perforated, etc., the function of oil and gas separation will be lost.  That is to say, the mixed gas and the exhaust pipe of the compressor are directly connected, so a large amount of oil is not separated, and will be discharged out of the body together with the gas, resulting in an oil-carrying fault during use.

        Solution: Damage to the oil-gas separation core is a common phenomenon. Therefore, the equipment should be checked before the operation of the screw compressor. The operating procedures should be strictly followed during use, and the equipment should be maintained regularly after use.  If the oil distribution core is found to be damaged and perforated, it should be replaced in time to ensure the normal operation of the equipment.

2.Oil return line failure

        During the working process of the screw compressor, the oil return pipeline shoulders important responsibilities.  A pressure differential will develop between the oil separator and the compressor inlet.  Under the action of this pressure difference, the oil return line is responsible for sending the oil collected at the bottom of the oil separation core back to the compressor for continued use in the next cycle.  If the oil return circuit is blocked, broken or installed incorrectly, the oil at the bottom of the oil separation core cannot be transported back to the compressor, resulting in too much oil at the bottom, and this part of the oil will be discharged with the gas.  There will be oil during the exhaust process.

         Solution: During the operation of the equipment, if the oil return line is blocked, it is necessary to check the pressure drop of the separator.  If the pressure drop is OK, the oil separator needs to be cleaned.  If the oil separation core is broken, it must be replaced in time.

3.System pressure control is too low

         During the operation of the screw compressor, the system pressure control is too low, which will cause the gas flow rate in the separator to be too fast, and the effect of the separator cannot be fully reflected, which will cause the separator core to enter the next link.  The oil content in the internal gas is too high, exceeding its separation range, resulting in incomplete oil-gas separation, and oil-carrying faults occur during the exhaust process of the compressor.

         Solution: The operator should be familiar with the control pressure of the equipment.  When a problem is found, the system load should be reduced to make the system pressure reach the rated working pressure.

4.Small pressure valve failure

        During the operation of the screw compressor, the function of the low pressure valve is to ensure that the system pressure is controlled above the low pressure during operation.  If the small pressure valve fails, the small pressure of the system will not be guaranteed, resulting in oil failure during the exhaust process.

       Solution: In actual operation, if the small pressure valve is found to be invalid, it must be replaced, and the work can be started after the replacement is completed.

5.Compressor cooling oil added too much

        Before the screw compressor is running, too much cooling oil is added, and then during the operation of the compressor, due to the high oil level, although the separation system separates the oil and gas, the gas will also be discharged during the deflation process. The cooling oil is mixed with the gas and discharged,  As a result, the oil content in the exhaust gas is too high, and oily faults occur.

       Solution: When adding cooling oil to the compressor, you must first understand the theoretical value of how much cooling oil should be added to the equipment.  The addition of cooling oil should be in the charge of a special person, and generally should be controlled below the middle of the sight glass.

6.The quality of cooling oil is unqualified

        Before the compressor is running, unqualified cooling oil is added, or the cooling oil exceeds the applicable time, and the cooling effect cannot be achieved.  Then, during the operation of the screw compressor, the cooling oil loses its effect and cannot cool and separate oil and gas.  Then there will be an oil failure during the exhaust process.

       Solution: The cooling oil should be added in strict accordance with the requirements of the equipment for cooling oil, because different equipment has different requirements for cooling oil.  After adding, the adding time should be recorded, and when the cooling oil reaches the service life, it should be replaced in time.  The quality of the added cooling oil should be strictly controlled to prevent the addition of unqualified cooling oil.