【Mechanical Equipment Technology Edition】Daily Question 20171121: Lubrication System of Screw Compressor Units (10)
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This post was last edited by YORK Industrial Refrigeration on 2017-11-24 at 09:03. Starting from now, in order to enhance communication among users, a 【Daily Question】 activity has been launched on the Mechanical Equipment Technology forum. We hope everyone will participate actively to progress and improve together! ! ! Rewards: 3 wealth points for active participation, 10-15 wealth points for correct answers. This question is valid for two days; no scoring will be given if more than two days pass. Oil leakage is one of the most common faults in screw compressors. What are the causes of oil leakage in such units? 1. On the one hand, from the perspective of oil temperature, either too high or too low oil temperatures can cause oil leakage. 2. On the other hand, from a system analysis perspective, is there moisture in the vehicle? Is the startup loading too fast? Problems related to oil return through full-liquid evaporators, as well as the oil separation efficiency (this situation is rare) ========================== Product promotions: Mechanical equipment——Maintenance procedures for York screw compressors https://bbs.hcbbs.com/thread-1806833-1-1.html Mechanical equipment——Upgrading of York Quinton control centers https://bbs.hcbbs.com/thread-1804837-1-1.html Mechanical equipment——Major repairs for GEA Grasso screw compressors https://bbs.hcbbs.com/thread-1800467-1-1.html Mechanical equipment——Disassembly and maintenance of British HOWDEN screw compressors https://bbs.hcbbs.com/thread-1832529-1-1.html Mechanical equipment——Disassembly and maintenance of Japanese Maekawa MYCOM screw compressors https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1786445
(A) The oil level is too high; too much engine oil has been added. Release pressure and drain oil to the normal position ； (B) The return oil pipe is blocked. It can be checked and replaced ； (C) The installation of the return oil pipe (with a distance of 1–2 mm from the bottom part of the oil separation element) does not meet the requirements; it can be adjusted again ； (D) When the unit is operating under overload and at low pressure, the gas consumption increases; however, since the pressure in the gas storage tank remains high, this phenomenon does not occur ； (E) Internal damage to the oil essence separator tank; it can only be detected through disassembly for inspection ； (F) Oil has deteriorated or been used beyond its shelf life ； (G) If the return oil check valve loses control, oil will flow back into the oil fine separator after the unit stops operating; this will result in oil leakage when the unit is started again ； (H) Damage or rupture of the air compressor oil fine separator element ； (I) There is a leakage at the minimum pressure valve, or the valve opens prematurely, resulting in low pressure inside the oil separator. This leads to a high concentration of gas in the oil mist; as a result, the flow rate through the oil separator increases, the load on the separator rises, its separation efficiency decreases, and fuel consumption goes up.
(A) The oil level is too high; too much engine oil has been added. Release pressure and drain oil to the normal position ； (B) The return oil pipe is blocked. It can be checked and replaced ； (C) The installation of the return oil pipe (with a distance of 1–2 mm from the bottom part of the oil separation element) does not meet the requirements; it can be adjusted again ； (D) When the unit is operating under overload and at low pressure, the gas consumption increases; however, since the pressure in the gas storage tank remains high, this phenomenon does not occur ； (E) Internal damage to the oil essence separator tank; it can only be detected through disassembly for inspection ； (F) Oil has deteriorated or been used beyond its shelf life ； (G) If the return oil check valve loses control, oil will flow back into the oil fine separator after the unit stops operating; this will result in oil leakage when the unit is started again ； (H) Damage or rupture of the air compressor oil fine separator element ； (I) There is a leakage at the minimum pressure valve, or the valve opens prematurely, resulting in low pressure inside the oil separator. This leads to a high concentration of gas in the oil mist; as a result, the flow rate through the oil separator increases, the load on the separator rises, its separation efficiency decreases, and fuel consumption goes up.
(A) The oil level is too high; too much engine oil has been added. Release pressure and drain oil to the normal position ； (B) The return oil pipe is blocked. It can be checked and replaced ； (C) The installation of the return oil pipe (with a distance of 1–2 mm from the bottom part of the oil separation element) does not meet the requirements; it can be adjusted again ； (D) When the unit is operating under overload and at low pressure, the gas consumption increases; however, since the pressure in the gas storage tank remains high, this phenomenon does not occur ； (E) Internal damage to the oil essence separator tank; it can only be detected through disassembly for inspection ； (F) Oil has deteriorated or been used beyond its shelf life ； (G) If the return oil check valve loses control, oil will flow back into the oil fine separator after the unit stops operating; this will result in oil leakage when the unit is started again ； (H) Damage or rupture of the air compressor oil fine separator element ； (I) There is a leakage at the minimum pressure valve, or the valve opens prematurely, resulting in low pressure inside the oil separator. This leads to a high concentration of gas in the oil mist; as a result, the flow rate increases when the oil mist passes through the separator, the load on the separator increases, the separation efficiency declines, and fuel consumption rises
A) The oil level is too high; too much engine oil has been added. Release pressure and drain oil to the normal position ； (B) The return oil pipe is blocked. It can be checked and replaced ； (C) The installation of the return oil pipe (with a distance of 1–2 mm from the bottom part of the oil separation element) does not meet the requirements; it can be adjusted again ； (D) When the unit is operating under overload and at low pressure, the gas consumption increases; however, since the pressure in the gas storage tank remains high, this phenomenon does not occur ； (E) Internal damage to the oil essence separator tank; it can only be detected through disassembly for inspection ； (F) Oil has deteriorated or been used beyond its shelf life ； (G) If the return oil check valve loses control, oil will flow back into the oil fine separator after the unit stops operating; this will result in oil leakage when the unit is started again ； (H) Damage or rupture of the air compressor oil fine separator element ； (I) There is a leakage at the minimum pressure valve, or the valve opens prematurely, resulting in low pressure inside the oil separator. This leads to a high concentration of gas in the oil mist; as a result, the flow rate through the oil separator increases, the load on the separator rises, its separation efficiency decreases, and fuel consumption goes up.
(A) The oil level is too high; too much engine oil has been added. Release pressure and drain oil to the normal position ； (B) The return oil pipe is blocked. It can be checked and replaced ； (C) The installation of the return oil pipe (with a distance of 1–2 mm from the bottom part of the oil separation element) does not meet the requirements; it can be adjusted again ； (D) When the unit is operating under overload and at low pressure, the gas consumption increases; however, since the pressure in the gas storage tank remains high, this phenomenon does not occur ； (E) Internal damage to the oil essence separator tank; it can only be detected through disassembly for inspection ； (F) Oil has deteriorated or been used beyond its shelf life ； (G) If the return oil check valve loses control, oil will flow back into the oil fine separator after the unit stops operating; this will result in oil leakage when the unit is started again ； (H) Damage or rupture of the air compressor oil fine separator element ； (I) There is a leakage at the minimum pressure valve, or the valve opens prematurely, resulting in low pressure inside the oil separator. This leads to a high concentration of gas in the oil mist; as a result, the flow rate through the oil separator increases, the load on the separator rises, its separation efficiency decreases, and fuel consumption goes up.
(A) The oil level is too high; too much engine oil has been added. Release pressure and drain oil to the normal position ； (B) The return oil pipe is blocked. It can be checked and replaced ； (C) The installation of the return oil pipe (with a distance of 1–2 mm from the bottom part of the oil separation element) does not meet the requirements; it can be adjusted again ； (D) When the unit is operating under overload and at low pressure, the gas consumption increases; however, since the pressure in the gas storage tank remains high, this phenomenon does not occur ； (E) Internal damage to the oil essence separator tank; it can only be detected through disassembly for inspection ； (F) Oil has deteriorated or been used beyond its shelf life ； (G) If the return oil check valve loses control, oil will flow back into the oil fine separator after the unit stops operating; this will result in oil leakage when the unit is started again ； (H) Damage or rupture of the air compressor oil fine separator element ； (I) There is a leakage at the minimum pressure valve, or the valve opens prematurely, resulting in low pressure inside the oil separator. This leads to a high concentration of gas in the oil mist; as a result, the flow rate through the oil separator increases, the load on the separator rises, its separation efficiency decreases, and fuel consumption goes up.
Answer: (A) The oil level is too high; too much engine oil has been added. Release pressure and drain oil to the normal position ； (B) The return oil pipe is blocked. It can be checked and replaced ； (C) The installation of the return oil pipe (with a distance of 1–2 mm from the bottom part of the oil separation element) does not meet the requirements; it can be adjusted again ； (D) When the unit is operating under overload and at low pressure, the gas consumption increases; however, since the pressure in the gas storage tank remains high, this phenomenon does not occur ； (E) Internal damage to the oil essence separator tank; it can only be detected through disassembly for inspection ； (F) Oil has deteriorated or been used beyond its shelf life ； (G) If the return oil check valve loses control, oil will flow back into the oil fine separator after the unit stops operating; this will result in oil leakage when the unit is started again ； (H) Damage or rupture of the air compressor oil fine separator element ； (I) There is a leakage at the minimum pressure valve, or the valve opens prematurely, resulting in low pressure inside the oil separator. This leads to a high concentration of gas in the oil mist; as a result, the flow rate through the oil separator increases, the load on the separator rises, its separation efficiency decreases, and fuel consumption goes up.
1) First, rule out any oil leakage or seepage on the exterior of the machine’s fittings. (2) Check whether the water cooler is leaking by stopping the machine, closing the inlet and outlet valves of the cooler, opening the drain valve of the cooler, and draining the accumulated water to observe whether Bolite lubricant is flowing out. Under normal circumstances, if there is residual pressure in the press system, a leak in the cooler will cause lubricating oil to flow out from the leak site. (3) In many cases, oil leakage and high fuel consumption in screw compressors are caused by the fine oil separator; a broken fine oil separator is the most common cause of oil leakage
1. Excessively low oil temperature in the screw compressor; 2. Excessively low exhaust temperature; 3. The unit is loaded too quickly and too aggressively; 4. Excessive liquid supply to the unit; 5. Insufficient thermal load on the unit; 6. Excessive oil added to the unit; 7. Fault in the unit’s return oil pipe.
1. A clogged or damaged return oil check valve results in poor oil return. 2. It is caused by an excessive amount of lubricating oil being added. 3. Caused by excessive lubricant foam. 4. The lubricating oil has aged due to prolonged use. 5. Caused by reasons such as perforations in the oil wick, etc