JB/T 6695-1993 Technical requirements for steam turbine lubricating oil system
Some standard content:
K54
JB
People's Republic of China Pressure Machinery Industry Standard JB/T66951993
1993-06-014
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1994-01-01fish
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1 Subject Content and Scope of Application
JB/T66951993
This standard specifies the basic design (including installation, operation safety), test inspection and packaging technical requirements of steam turbine lubricating oil system. This standard is applicable to the lubricating oil system of fixed steam turbine generator set, and can also be used as a reference for the lubricating oil system of other types of units. 2 Reference standards
GB539
GB2537
GB3323
GB7596
JB1147
JB2862
JB2901
JB2900
JB3082
JB3289
JB4058
JB4272
ZBK54003
ZBK54 014
YB231
YB487
3 General
Oil-resistant rubber asbestos sheet
Turbine oil
Radiography and quality classification of steel fusion welded butt jointsQuality index of turbine oil for power plants
Technical conditions for steel shell and tube heat exchangers
Technical conditions for turbine packaging
Technical conditions for turbine antirust
Technical conditions for turbine paint
Oil level indicator for turbine oil tank|| tt||Special inspection method for steam turbine parts
Standard for cleanliness of steam turbine
Technical conditions for casting layer of steam turbine bearing alloyTechnical cases for water pressure test of pressure-bearing parts of steam turbineOil cooler size series and technical conditionsSeamless steel pipe
Manufacturing of bearing alloy ingots
3.1 The lubricating oil system consists of main oil pump, high-pressure oil pump, emergency oil pump, spare lubricating oil pump, oil tank, oil cooler, oil filter, oil injector (or oil turbine), valve, pipeline, control device and accessories such as local meter. 3.2 The lubricating oil system shall ensure reliable lubricating oil supply to each bearing of the unit, and shall also supply oil to the turning device during startup and shutdown. Units with top shaft device or hydrogen-cooled generator shall also supply oil to the top shaft device or hydrogen-cooled sealing system. 3.3 The various indicators of the lubricating oil used in this standard shall comply with the provisions of GB2537. 3.4 The working oil volume, oil pressure, oil temperature and oil speed of the lubricating oil system shall meet the unit operation requirements, and the system tightness shall be maintained to eliminate oil leakage and oil quality deterioration.
3.5 The manufacturer shall clean up the residual sand, welding slag and debris in the lubricating oil system before sealing it out of the factory, and put forward the cleaning requirements of the lubricating oil system before trial operation to the user.
3.6 The layout of the lubricating oil system shall be reasonable, easy to operate and maintain. It can also be arranged according to user requirements. 3.7 Units above 50000kW and 50000kW shall be equipped with devices to remove oil and gas from the bearing seat and oil tank. 3.8
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When the user needs it, the manufacturer can provide such equipment as set oil pipes and container oil tanks according to the contract. 1993-06-01Long
1994-01-01Yi
JB/T66951993
3.9 Purchased parts of the lubricating and clearing oil system other than those specified in this standard shall comply with the requirements of relevant technical standards. 4 Basic design
4.1 General principles
The design of the lubricating oil system must be able to meet all operating conditions encountered during the operation of the steam turbine generator set. 4.1.1 If the main oil pump is abnormal during the operation of the unit, the high-pressure oil pump should be started to maintain operation. If the high-pressure oil pump fails, the standby lubricating oil pump should be automatically started to prepare for shutdown; if the standby lubricating oil pump fails or loses AC power, the emergency oil pump should provide lubricating oil. 4.1.2 The emergency oil pump can use a DC oil pump or a steam turbine oil pump to ensure that the unit can provide lubricating oil in an accident state. 4.1.3 A high-pressure oil pump shall be installed to supply oil for the regulating and safety parts and lubricating system before the main oil pump is put into operation. Its outlet oil pressure shall be about 0.1MPa lower than the outlet oil pressure of the main oil pump and meet the requirements of the regulating and safety parts. 4.1.4 When the main oil pump is centrifugal, an oil injector (or oil turbine) shall be installed in the lubricating oil system to ensure that the pressure at the inlet of the main oil pump is positive.
4.1.5 A check valve shall be installed at the outlet of the oil injector (or oil turbine) to prevent oil backflow and leakage. 4.1.6 The oil tank shall be installed below the operating layer so that the oil in the oil return pipe can return to the oil tank by gravity. 4.1.7 The exhaust device (including the oil mist separator) can be installed on the oil tank or outside the machine room. The oil smoke must be discharged to the outside. The exhaust device can be used for the oil tank with small capacity.
4.1.8 In order to ensure the quality of the oil entering the bearing, an oil filter shall be installed after the oil cooler. 4.1.9 A spare oil cooler should be installed in the lubricating oil system to ensure the normal operation of the oil system. 4.1.10 A relief valve should be installed in the lubricating oil system. When the oil pressure exceeds the rated value, the valve can be automatically opened to allow part of the oil to return to the oil tank. 4.1.11 A pressure relay must be installed in the lubricating oil system. When the oil pressure entering the bearing is lower than the rated value, different signals can be transmitted according to different oil pressure values. The general oil pressure (gauge pressure) recommended values ??are as follows: a.
When it is lower than 0.08MPa, a signal is issued
h.
When it is lower than 0.055MPa, the spare lubricating oil pump is started: c.
d.
e.
Note
When it is lower than 0.04MPa, the emergency oil pump is started
When it is lower than 0.02MPa, the magnetic circuit breaker is opened, the main steam valve is closed, and the machine is shut down; when it is lower than 0.015MPa, the oil pressure circuit is opened and the turning device is stopped. The machine with a capacity of 25000kW and below 250G0kW can refer to the above requirements. The pressure oil pipes are all made of seamless steel pipes, and the materials shall comply with the provisions of YB231, and there shall be no leakage at the joints. 4.1.12
4.1.13
The flanges and joints on the lubricating oil pipeline shall be one level higher than the original design pressure level. The flange gaskets on the oil pipeline can generally be made of high-pressure oil-resistant rubber asbestos sheets and shall comply with the provisions of GB539. 4. 1. 14
4.1.15 The inclination slope of the return oil pipe to the oil tank shall be 5/1000~15/1000, and the inclination slope of the set oil pipeline shall be 1%~3%. The inclination slope of the return oil pipe shall not be folded in the middle. 4.1.16 The lower part of the bearing seat and the connection with the return oil pipe must be equipped with a probe hole to observe the oil flow at any time. 4.1.17
The distance between the foundation and the oil pipe should be greater than 30mm to prevent the vibration of the foundation. The oil flow rate in the return oil pipe should be 0.5~1.5m/s! A certain space should be considered between the oil fluid in the return oil pipe and the cross section of the pipe to allow the oil and gas to be released. 4.1.18
4.1.19 The oil flow rate of the bearing oil inlet pipe should be 1.5~2m/s. 4.1.20 There should be no steam pipeline directly below the flange of the oil pipeline. If there is an oil separator, an oil separator should be installed. Flanges should be used as little as possible on the oil pipeline near the steam pipeline to prevent fire. The distance between the outer diameter of the oil pipeline and the outer diameter of the steam pipeline insulation layer is intended to be greater than 0.2m. 4.2 Oil tank
4.2.1 Definitions of terms (see Figure 1) are as follows: Parking oil level (oil level A) refers to the highest oil level that the oil tank can reach when the entire system is parked. Maximum operating oil level (oil level B): refers to the highest oil level that should be allowed to reach during normal operation of the equipment. 2
JB/T 66951993
Minimum operating oil level (oil level C): refers to the lowest oil level that should be allowed to reach during normal operation of the equipment. Suction loss oil level (oil level D): refers to the oil level at which the oil pump begins to lose its starting power. Filling capacity: refers to the total volume below the parking level. Running oil level: refers to any position between the highest and lowest operating oil levels. Holding capacity: refers to the total volume below the lowest operating oil level. Parking capacity: refers to the volume between the parking oil level and the highest operating oil level. Working capacity: refers to the volume between the lowest operating oil level and the suction loss oil level. A
B
C
D-
E
Parking oil level
Maximum operating oil level
Minimum operating oil level
Suction loss oil level
Pump suction oil level
Figure Schematic diagram of oil tank oil level
4.2.2 The oil tank should have 7 to 15 cycles per hour, and the capacity of the oil tank in positive operation should not be less than 5 times the amount of oil flowing through the bearing per minute. 4.2.3 Maintain a normal operating oil volume of at least 4 to 8 minutes. 4.2.4 The oil tank should be equipped with two replaceable filters, and the oil level on both sides should not exceed the specified value, otherwise the filters in the oil tank should be cleaned. 4.2.5. In order to remove solid particles in the oil, an oil filter must be installed to return the main bearing oil to the oil tank. The mesh holes of this oil filter should not exceed 32 holes/cm.
4.2.6 The design of the fuel tank should ensure that there is enough space between the oil level and the pre-plate of the fuel tank to ensure the discharge of oil smoke. 4.2.7 The capacity of the fuel tank should be sufficient to accommodate the total operating oil level. The total operating oil level should include the volume of the operating oil level in the tank plus the remaining oil discharged from the system when the turbine generator unit is stopped. 4.2.8 The return oil should flow in a zigzag manner in the tank to easily separate impurities. 4.2.9 The fuel tank should be equipped with an oil purification device interface. The oil supply suction inlet should be as close to the bottom of the fuel tank as possible. The oil supply and oil return interfaces should be reasonably arranged so that siphon cannot occur below the minimum operating oil level of the tank. The tank, its connections and channels must be sealed. 4. 2. 10
4. 2. 11
The inlet of the oil pump and oil injector (or oil turbine) in the oil tank should always be fully immersed, but the distance from the oil pump inlet to the bottom of the oil tank should not be less than 150mm , the inlet of the oil injector should be less than 100mm lower than the minimum operating oil level. 4.2.12
4.2.13
4.2.14
The reasonable ratio of the external dimensions of the fuel tank is recommended to be L, b*h Yan 21: 1. The fuel tank of a small unit can double as equipment base. The fuel tank should have sufficient rigidity to prevent deformation and vibration, and the screw holes around the tank and at the bottom should not penetrate the tank wall. The top or side of the fuel tank should be equipped with a patterned iron plate anti-skid path or ladder. Large fuel tanks should also be equipped with a patterned iron plate anti-skid path or ladder inside for maintenance, cleaning and installation of internal components. In addition, if the user requires it, safety movable railings can be considered on the top surface of the fuel tank. 4.2.15 In order to separate water and impurities, the bottom of the fuel tank should be inclined or arc-shaped. Manholes should be provided to allow inspection and cleaning of the entire interior of the tank.
4.2.16 The fuel tank should be equipped with a local oil level indicator and a high and low oil level alarm device. The technical indicators of the oil level indicator should comply with JB3082. When the user has requirements, the oil level value can be displayed in the control room 3
JB/T66951993
4.2.17 The inlet of the electric heater in the oil tank should be 100mm lower than the lowest oil level. 4.2.18 A large-diameter oil drain valve should be installed at the lowest point of the fuel tank. 4.2.19 The smoke exhaust device should maintain the vacuum on the oil surface in the fuel tank at -50~m-250Pa. 4.2.20 All oil return pipes should enter the oil tank at a point higher than the maximum operating oil level and away from the oil suction port of the oil pump to avoid the formation of swamp flow at the inlet of the pump.
4.3 Heater
If necessary, the heater in the oil tank can be an electric heater. The heater should be able to raise the oil in the oil tank from the specified minimum ambient temperature to The minimum operating temperature specified for the equipment. The maximum surface power dissipation of the submersible electric heater is 2.3W/cm2. 4.4 Overflow valve
4.4.1 The maximum allowable overflow is 25% to 40% of the total lubricating oil volume. 4.4.2 The adjusting nut of the relief valve must be locked with a safety nut. 4.4.3 The lubricating oil system should be provided with a suitable overflow valve to prevent the abnormal pressure rise that may occur when the main oil pump and the backup lubricating oil pump are running. The overflow valve should work smoothly without any shock or instantaneous equipment shutdown. change. Overflow readings should avoid excessive rise in oil temperature caused by oil circulation.
4.5 Oil Cooler
4.5.1 When the inlet oil temperature is 55℃ and the inlet cooling water temperature is 33℃, the outlet oil temperature of the oil cooler should not be greater than 45℃. 4.5.2 The assembly of the oil cooler should be in accordance with the regulations of ZBK54014 and JB1147. 4.5.3 The oil pressure and water pressure of the oil cooler should be less than 0.5MPa (gauge pressure), and the oil side pressure should be greater than the water side pressure. 4.5.4 The total water resistance of the wine cooler and its pipes should be less than the sum of the water resistance of the condenser and its pipes. 4.5.5 The structure of the oil cooler should be easy to install, maintain, clean, use and keep sealed to avoid fire. 4.5.6 An exhaust port must be provided on the oil side of the oil cooler to remove air. 4.6 Oil filter
4.6.1 The oil filter can use a multi-layer filter with a simple structure. Two oil filters should be connected in parallel, one of which is spare. You can also use one oil filter plus one. Only by-passing the condensate, a single oil filter should be able to bear the filtration capacity of the unit under normal operating oil volume. 4.6.2 A pressure difference indicating instrument must be installed before and after the oil filter to monitor the degree of blockage of the filter at any time. 4.6.3 When the pressure difference between the front and rear of the oil filter exceeds the specified value, a backup oil filter or a bypass valve must be activated to facilitate cleaning of the filter. net. 4.6.4 The filtration accuracy of the oil filter should not be greater than 25 μm. 4.6.$ The minimum design pressure of the oil filter housing and end cover should not be lower than the maximum discharge pressure of the centrifugal pump (at the highest speed of the turbine). 4.6.6 The filter element material of the oil filter should be corrosion-resistant material. 4.7 Oil injector (or oil turbine)
4.7.1 A coarse filter screen must be installed at the oil suction area of ??the oil injector (or oil turbine). 4.7.2 The check valve at the outlet of the oil injector (or oil turbine) must be tight. 4.8 Piping system
4.8.1 The materials used in the system, including sealing elements, orifice plates, pipe coatings and rubber pipes, should be oil-resistant and should comply with relevant standards and have sufficient properties under the predetermined operating temperature. physical and chemical properties. 4.8.2 Pipe butt welding and elbows should be minimized. 4.8.3 Protective measures must be taken on the internal and external surfaces of all pressure pipes and discharge pipes to prevent rust. 4.8.4 Pipeline design shall be in accordance with the requirements of 4.1.12~4.1.20 and 4.1.21~4.1.22. 4.9 Oil purification device
4.9.1 When the user needs it, an oil purification device can be used. The capacity of the oil purification device is generally 20% of the fuel tank capacity. 4.9.2 The oil purification device can be put into operation only if it does not affect the normal operation of the unit. 4.9.3 The installation height of the oil purification device must be lower than the main oil tank. 4.9.4: The oil purification accuracy should reach the following indicators: 4
JB/T66951993
The water content of the oil after purification shall not be greater than 0.05%, a.
b. The pollution level of the oil sample after purification shall not be higher than level 17/14. Note: Grade 17/14 means that the number of particles larger than 5 μm in each milliliter of oil should be greater than 640 and less than or equal to 1300. The number of particles greater than 15 μm should be greater than 80 and less than or equal to 160
4.10 Top shaft oil system (for units with a shaft oil system). 4.10.1 The oil suction port of the jacking oil system must be placed behind the lubricating oil filter (except for the self-provided filter of the jacking oil pump). Item 4.10.2 Check valves must be installed on the outlet of the shaft oil pump and the top shaft oil distribution pipe. 4.11 Pump and driver
4.11.1 A coarse filter must be installed at the suction inlet of the pump, and a coarse filter must be installed at the outlet. Pressure gauge to show pump outlet pressure. 4.11.2 Generally, the main oil pump is driven by a steam turbine, while the high-pressure oil pump and backup lubricating oil pump are driven by AC motors. The emergency oil pump can be driven by a DC motor or other AC motor.
4.11.3 The main oil pump should be able to provide the normal operating oil volume required by the equipment. The capacity of the accident oil pump can be determined based on 80% of the lubricating oil volume. 4.11.4 Any operating conditions of the selected centrifugal oil pump should be within the stable area of ??the pump characteristics. 4.11.5 A check valve should be provided at the outlet of each pump. 4.12 Other requirements
4.12.1 The casing must be embedded in the foundation when the oil pipe passes through it. There should be a certain gap between the oil pipe and the casing. 4.12.2 Vibration reduction measures must be taken for the supports and hangers of oil pipes when necessary. 4.12.3 The inner wall of the oil pipeline is not allowed to be cleaned with caustic soda solution. If steam cleaning is used, it should be dried with compressed air immediately after cleaning to prevent accelerated oxidation of the oil and deterioration of the oil quality. 4.12.4 Cleaning of the lubricating oil system The degree should comply with JB4058 regulations. 4.12.5 Noise control of the lubricating oil system should be jointly agreed upon by the manufacturer and the user. 4.12.6 The oil pressure entering the bearing should generally be 0.08~0.12MPa (gauge pressure). For large units, it can be appropriately increased to 0.1~0.15MPa (gauge pressure).
The oil temperature entering the bearing should be 35~45C, which can be appropriately increased to 40~55°C for large units. 4.12.73
4.12.8 An alarm should be issued when the bearing return oil temperature is between 65 and 70°C, and the machine should be shut down when it is greater than 75°C. 4.12.9 The bearing should be equipped with a temperature measuring element, and the temperature of the bearing alloy should be controlled below 95C. When the temperature of the bearing alloy is greater than 95C, an alarm should be alarmed. When the temperature of the bearing alloy is greater than 105C, the machine should be shut down
4.12.10
The material should be made of tin-based alloy, its grade is zchsnsbll-6 or zchsnsb8-4, and the material should meet the requirements of YB487.
4.12.11 The technical requirements of the bearing alloy casting layer shall comply with the provisions of JB4272. 5 Welding
5.1 The welding groove type, processing accuracy, and assembly requirements should comply with the drawings. 5.2 Welding process requirements should comply with relevant national standards or industry standards, 5.3 The butt joint of the pipe should be flush with the inner wall, and the misalignment of the inner wall is not allowed to exceed 10% of the pipe wall thickness and should not exceed 1mm. 5.4 The quality inspection of the weld should be in accordance with GB3323. 6 Lubricating oil quality
The various indicators of lubricating oil quality must comply with GB2537. Lubricating oil should generally use HO-20 and HO-30 grades of steam turbine oil.
6.2 The quality monitoring indicators of lubricating oil in operation shall be in accordance with GB7596. 7 Test and inspection
7.1 Test
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JB/T 66951993
7.1.1 The lubricating oil system and each assembly set should be hydraulically tested at 1.5 times the working pressure. 7.1.2 The pressure-bearing parts manufactured by the manufacturer, including the oil cooler housing, valve housing, oil filter body, and lubricating oil system welded pipe assemblies, shall be subjected to hydraulic pressure tests at 1.5 times the working pressure. The test method shall be in accordance with the provisions of ZBK54003. 7.1.3 The oil tank shall be tested for sealing with kerosene, and the test method shall be in accordance with the provisions of JB3289. 7.1.4 If the user has a need, the oil cooler shall be subjected to performance tests, and the performance test procedures shall be in accordance with the relevant industry standards. 7.1.5 The oil filter shall be subjected to differential pressure flow tests. 7.1.6 The first main oil pump and oil injector (or oil turbine) shall be subjected to performance tests, and the test methods shall be in accordance with relevant regulations. 7.1.7 The oil proof valve shall be subjected to performance tests, and the test methods shall be in accordance with relevant regulations. 7.2 Inspection
7.2.1 The electrical switches, alarm devices, instruments, valves, etc. in the oil system shall be checked regularly to prevent malfunction. 7.2.2 The oil system is not allowed to be cut off during commissioning. It should be able to meet the requirements of turbine regulation and lubricating oil under startup, shutdown, normal operation and accident conditions.
7.2.3 The cleanliness of the lubricating oil system should comply with the requirements of Article 4.12.4. 7.2.4 The welding of the system should comply with the provisions of Article 5. 7.2.3 The user can verify according to the inspection and test items provided by the manufacturer. 8 Drawings and information
8.1 The manufacturer should have the following information for the user to check: Material certificate:
b. Test report of each part of the lubricating oil system: Operation test report:
c
d, quality certification test report.
8.2 The manufacturer should provide the user with the required external dimension drawings. The national sample should include equipment weight, basic dimensions, models of each part, performance data, etc.
8.3 The manufacturer shall provide the user with random technical documents and drawings, including lubricating oil system diagram, general diagram of each component, manual, supply item list, product certificate, packing list and test report as specified in the contract. 9 Rust prevention, paint
9.1 Rust prevention shall comply with the provisions of JB2901.
9.2 Paint shall comply with the provisions of JB2900.
10 Packaging
The packaging shall comply with the provisions of JB2862.
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Additional instructions:
This standard is proposed by the Ministry of Machinery and Electronics Industry. JB/T66951993
This standard is under the jurisdiction of Shanghai Power Generation Equipment Complete Design Research Institute. This standard was drafted by Shanghai Power Generation Equipment Complete Design Research Institute of the Ministry of Machinery Industry and Shanghai Steam Turbine Factory. The main drafters of this standard are Gao Baolu, Chen Zengrong, Qin Wangen, Lu Yongchun, Li Yan and Chen Chi. Drawing
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