Operating procedures for hydraulic turbines in hydrogenation units

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It’s available in the forum; just draw one to get it. Operating Procedures for Hydraulic Turbine Pump Sets 1. Overview: In order to recover the pressure energy and thermal energy of the oil produced as a result of reactions, thereby reducing the energy consumption of the facility, both the RDS and HC units use motor-driven hydraulic turbine pumps as the main pumps for feeding materials. The reaction feed pumps in the hydrocracking unit are equipped with hydraulic turbine pump sets, namely 1401-P-102A and 1401-HT-101, while the reaction feed pumps in the RDS unit have hydraulic turbine pump sets numbered 201-P-102A/B and 201-HT-101A/B. All three of these pump sets were imported from the Japanese company EBARA. In this design, the motor and the hydraulic turbine are connected to each other via couplings and clutches; the gearbox is used to increase the speed before driving the feed pump. The feed pump and the hydraulic turbine are located at the outer ends on opposite sides of the pump set. Under rated operating conditions, the output of the hydraulic turbine pump is about 25% of the power consumption of the main pump. Due to the high flow rate and high head required, the reaction feed pump uses an HDB-type multi-stage centrifugal pump with a double-suction design, while the hydraulic turbine pump is of the HSB-type with a single-suction design. Both types feature a double-casing design; the inner casing has a horizontally split double-volute structure. The outer casing contains only the pump’s inlet and outlet ports as well as the balance lines. The outer casing of the feed pump bears the outlet pressure except for the inlet area, whereas the inner casing experiences a lower differential pressure. Its design features are as follows:  Outer casing and end caps – The outer casing and end caps are made of forged steel, with the outer casing supported by two cat claw supports on each side of the horizontal centerline. Due to the high temperature of the medium, in order to absorb the axial thermal expansion caused by this high temperature, the outer cylinder is secured using two foot bolts near the coupling end, while an oval hole is provided at the other end; this allows both the feed pump and the hydraulic turbine to expand freely in the direction away from the coupling.  Inner casing: The inner casing features a horizontally split double-volute design. Its main advantage is that the impellers can be arranged back to back, which ensures dynamic balance under all operating conditions and allows the pump to balance its own axial forces. It also has a wide efficient range and a flat efficiency curve, making it easy to disassemble and assemble. The first stage can be designed as a double-suction type, which is highly advantageous for feed pumps. Its drawback is that the radial forces are unbalanced due to its non-fully symmetric structure.  Rotor section: The rotor consists of an impeller, shaft, etc., and can be taken out as a single unit, which is very convenient for on-site inspection of wear-prone parts, the clearance between moving and stationary components, as well as the straightness of the shaft. This is particularly suitable for the maintenance model at Hainan Refining & Chemical Company, where there are few staff members.  Mechanical seal: The medium in hydraulic turbines is high-temperature and high-pressure liquid. To prevent a reduction in the seal’s service life, it is necessary to take into account the issues related to gas release and vaporization during seal flushing. Therefore, hydraulic turbines use the Plan 53B flushing scheme specified in API682-2nd standard, which involves using external supply for the flushing oil.  Over-speed protection device: Due to the limitations imposed by the design strength of the turbines and other equipment in the turbine pump set, hydraulic turbines are equipped with an over-speed protection system.  Dual-drive mechanism: The turbine pump set employs a dual-drive system in which both a hydraulic turbine and an electric motor are used to drive the feed pump. The rated output of the main drive motor is sufficient to drive the feed pump without the assistance of the hydraulic turbine. An overspeed clutch is installed between the hydraulic turbine and the feed pump set, with the hydraulic turbine located on the same side as the main drive motor and the driven equipment (the feed pump).  The hydraulic turbine is equipped with a full-flow bypass valve with regulating capability, which enables cascade control together with the inlet control valve of the hydraulic turbine.  The overdrive clutch consists of 5 main components: an input coupling component, an input component, a helical sliding component, an output component, and an output coupling component. 2 Performance Parameters – Performance parameters of high-pressure feed pumps and hydraulic turbine pumps
Parameter | Equipment Name | Medium | Temperature (°C) | Pressure (MPa) | Normal Flow Rate (m3/h) | Efficiency (%) | Shaft Power (kW) | Motor Power (kW) | Motor (Turbine) Speed (rpm) | Inlet | Outlet
1401-P-102A/B | Reaction Feed Pump | Crude oil | 169 | 0.6 | 2.71 | 289 | 75 | 1884 | 2200 | 3000
1401-HT-101 | Hydraulic Turbine Pump | Reactant | 14 | 2.5 | 281 | 70 | 627.8 | 2980

3 Process Flow Description
3.1 Crude Oil Pump Flow
Crude oil enters through a DN300 pipeline from the bottom of the tank; it passes through the control shut-off valve UV0601 before reaching the inlet of the feed pump P-102. After being pressurized by the pump, the oil goes through a heat exchanger for temperature adjustment and then through a heater to reach the temperature required for the reaction, before being sent to the reactor. 3.2 Hydro-turbine process: The hot heavy fraction oil enters through the bottom of heat heavy fraction tank D-103 via a DN200 pipeline, passes through control shut-off valve UV1201 and control valve FV1202 to reach the inlet of hydro-turbine HT-101; after being depressurized by the hydro-turbine, it enters heat light fraction tank D-103. 4 Operation Procedures: Performing the necessary preparations before operation is an important condition for ensuring a safe start-up and reducing startup time. If the preparation is inadequate, it often delays the start-up time and may even damage the equipment. Preparatory work includes the inspection of various systems, the preparation of various tools, and various tests. 4.1 General checks and requirements before operation 4.1.1 Verify that the installation or maintenance work is complete, check the maintenance records, and ensure that the maintenance data are accurate. 4.1.2 Clean the site to ensure that work is completed, materials are removed, and the area is tidy; also check the instruments, electrical equipment, water system, oil system, and safety systems to confirm that they are in proper working condition. 4.1.3 The monitoring, regulating, and control instruments as well as valves are complete, and the operation during commissioning tests is normal. 4.1.4 Prepare all the tools to be used during startup. 4.1.5 Fill the fuel tank with turbine oil of the specified grade, L-TSA46, to the appropriate level. 4.2 Inspection and preparation of main equipment such as feed pumps and hydraulic turbines 4.2.1 Check whether the bolts connecting the feed pump, hydraulic turbine, motor, etc., are firmly tightened. 4.2.2 Check the inlet and outlet pipelines of the feed pump and hydraulic turbine to ensure that the valve positions are correct. 4.2.3 Close the drain valves of the feed pump and hydraulic turbine pump casing after draining. 4.3 Inspection, Testing, Adjustment, and Commissioning of the Oil System 4.3.1 Inspection, Testing, and Adjustment of the Lubrication System in the Bearing Lubricating Oil Station 4.3.1.1 Inspect the oil tank, filter, and oil cooler. Check the oil level and temperature in the tank; if they are insufficient, add oil. Check the cooling water system of the oil cooler; make sure the switch valve of the filter is in the correct position, switched to the side that is ready for use. Check that all valves in the oil system are in the correct position and that the equipment is in good condition. 4.3.1.2 Check the auxiliary oil pump. Verify that it is operating properly; the auxiliary oil pump can be activated first to facilitate oil circulation. The oil coolers and oil filters should be filled with oil to remove air. Oil thermometers and pressure gauges should be fully equipped, with appropriate ranges and functioning properly. Observe the flow of oil through the oil flow sight glass. Turn on the cooling water for the oil cooler based on the oil temperature. The oil quality test and the pressure difference of the oil filter are within acceptable limits; the oil level is normal, and the oil temperature is above 23°C. 4.3.1.3 Low lubricating oil pressure test: The purpose of this test is to verify that an alarm signal should be generated when the lubricating oil pressure drops to the set value, and that the auxiliary pump should start up, in order to check the performance of the pressure switch and the shutdown signal system. The test method can reduce the lubricating oil pressure by adjusting the opening degree of the valve on the lubricating oil pipeline. Since the main oil pump is a shaft-mounted pump driven by the pump unit, it is not possible to conduct a self-start-up test using the method of dual electric pumps; instead, the auxiliary oil pump must be used in place of the main oil pump for testing the low lubricating oil pressure alarm and the shutdown mechanism when the lubricating oil pressure drops further. The specific steps are as follows: 4.3.1.3.1 Start the auxiliary oil pump and set the knob to the automatic position, then adjust the oil pressure to the normal range of 0.2–0.25 MPa. 4.3.1.3.2 Inform the electrician to push the trolley of the main motor to the test position; the operation light of the main motor will then turn on. 4.3.1.3.3 Stop the auxiliary oil pump; when the lubricating oil pressure drops to 0.1 MPa, a audible and visual alarm signal for low lubricating oil pressure is issued, and the auxiliary oil pump starts automatically. Check whether the low lubricating oil pressure value is in line with the design specifications, and repeat this process three times – the error should not exceed the specified range. 4.3.1.3.4 Set the knob of the auxiliary oil pump to the manual position and continue to reduce the lubricating oil pressure. When the lubricating oil pressure reaches 0.08 MPa, a low lubricating oil pressure audio-visual alarm is triggered, along with a shutdown signal. Check whether the value indicating low lubricating oil pressure is in line with the design specifications; repeat this process three times, and the error should not exceed the specified range. 4.3.1.4 Fuel tank level and fuel temperature alarm test. 4.3.1.5 Once the auxiliary oil pump is operating properly, fill the shaft head pump through the filling line promptly. 4.4 Inspection and commissioning of the barring gear. Ensure that the rotor rotates smoothly during cranking; if any abnormal noises are heard, such as those resulting from abrasive wear or uneven rotor movement, the pump must be disassembled to inspect the rotor components such as the pump body seal ring and the impeller seal ring. 4.5 The alarm and interlock systems of the unit’s lubricating oil system and process systems have accurate and reliable performance, and meet the corresponding specified values. 4.6 Inspection and adjustment of the heat pump line: If a high-temperature medium suddenly enters a pump with a lower temperature, the large temperature difference can lead to uneven thermal expansion. This misalignment between the pump body and its moving components may result in seizure during startup. Similarly, the standby pump must also be thoroughly warmed up before starting. Under normal conditions, in the heat pump process, the fluid enters the pump through the heat pump line connected to the pump’s outlet, and then is discharged via the pump’s inlet valve. When the heat pump fluid is injected into the pump body, if the temperature difference between the upper and lower parts of the pump body does not reach the specified value, the drain valve can be opened to minimize this temperature difference and meet the requirements. 4.7 Inspection, testing, and adjustment of mechanical seal systems 4.7.1 Valves such as those for flushing liquid drainage and low-point condensate drainage shall be closed after condensate has been drained. 4.7.2 The vent valve at the top of the sealed tank should be closed, and the pressure indicator should show normal values; this prevents the sealing system from being subjected to large pressure differences that could damage the mechanical seal. 4.7.3 All alarm devices for pressure, liquid level, etc. shall be calibrated properly and reach the specified values before being put into use. 4.7.4 Put the cooling water for the sealed tank into operation, and confirm through the sight glass that it is in flow. 4. **Pumping unit: After starting the pump, check for leaks in the seals and other components; once no issues are found, the seals can be put into normal use. 4.8 Specific steps for starting the pump 4.8.1 After all the above tasks are completed, verify that the drain valve and vent valve on the feed pump body are closed, as well as the vent valves on the inlet and outlet pipelines. 4.8.2 Handle the power-on and power-off work tickets as required, and supply power to the relevant pumps. 4.8.3 For the pumping unit, ensure that the inlet valve of the feed pump is fully open, the bottom cut-off valve of the filtered crude oil buffer tank is fully open, and the outlet electric valve as well as the Y-type outlet manual valve are fully closed. Since the lubrication of some components of the feed pump relies on the medium inside the pump, it cannot be started if the pump is not completely filled; otherwise, some of its components are at risk of damage. During pumping, the pump’s outlet line, the seal flushing line, and the vent valve on the top of the storage tank should be opened to allow air to escape, ensuring that the pump’s inlet valve and pressure gauge valve are fully open. 4.8.4 Verify that sufficient flushing medium is flowing through the mechanical seal. 4.8.5 Verify that the inlet pressure of the feed pump meets the requirements, and that the return valve for the minimum flow rate is open by 50%. 4.8.6 Ensure that the lubricating oil pressure exceeds the interlock value (it is recommended to be no less than 0.08 MPaG); it can be seen through the sight glass that the lubricating oil is in flow. 4.8.7 Start the motor, and the outlet electric valve will open automatically (within 30 seconds). Once the pump is running stably and the outlet pressure reaches the specified value, do not hold the pressure for too long; instead, slowly open the Y-type outlet manual valve while gradually closing the minimum flow return valve. Pay attention to changes in the outlet pressure of the feed pump as well as the motor current, and make sure that the current does not exceed the allowable level. 4.8.8 After startup, check the inlet pressure; if the pressure drop is abnormal, it may be due to a clogged inlet filter, which should be cleaned. Meanwhile, examine the following parameters of both the motor and the feed pump:  Motor current and voltage  Noise level  Bearing temperature and vibration  Inlet and outlet pressures of the feed pump  Lubricating oil pressure (0.10±0.02 MPaG)  Sealing leakage. 4.8.9 When starting this pump set, under normal circumstances, the hydraulic turbine should be put into use only after the feed pump and the entire system are operating stably. For putting the hydraulic turbine into operation, the steps are basically the same as those for the feed pump. When opening the inlet valve, the liquid level control valve of the high-pressure tank can be set to automatic mode. The most important thing is to prevent backpressure on the mechanical seal; it is essential to follow this sequence:  Close the inlet valve completely  Open the outlet valve completely  Open the inlet isolation valve  Open the inlet control valve as quickly as possible. Note: To avoid excessive pressure on the low-pressure side (exit) of the hydraulic turbine, the outlet valve should be opened, and it can only be closed after the pump has stopped operating. 5 Routine inspection and maintenance Abnormal pressures, current fluctuations, vibration, noise, etc., are all signs of pump problems; it is necessary to identify the causes and take appropriate actions at an early stage. It is required to keep proper daily inspection records and carry out maintenance for pumps, hydraulic turbines, and 52B mechanical seals in accordance with the following items: 5.1 Inspection items for pumps and hydraulic turbines  Inlet and outlet pressures  Current values and fluctuations  Bearing temperatures  Oil level  Lubricating oil pressure (0.12±0.02 MPaG)  Vibration  Noise  Condition of shaft seals 5.2 Inspection items for 52B mechanical seals  No leaks in the connection pipelines  Level of the isolation fluid  Temperature of the isolation fluid  Temperature and flow rate of the cooling water  Abnormal leaks from the external seals  Signal alarm conditions 6 Precautions: 6.1 Ensure that the inlet valve is fully open, while the outlet valve is fully closed. 6.2 After the motor starts up and is operating properly, open the outlet valve while monitoring the outlet pressure; then keep the pump running continuously. It should be noted that the increase in flow rate resulting from opening the outlet valve will cause a change in the inlet pressure. If the inlet pressure is lower than the value listed in the data sheet, the cause should be identified and appropriate action taken. 6.3 The following practices should be avoided: those in which the temperature of the fluid inside the pump rises when the pump is stopped, leading to vaporization and resulting in noise, vibration, corrosion, and other issues. Moreover, when the pumped medium has a high vapor pressure, such operation is not allowed even for just one minute. Similarly, the machine should also be shut down when noise and vibration increase and the flow rate drops to about half of the optimal efficiency point flow rate. 6.4 Even when driving the pump using the same method as described above (with a highly volatile hydrocarbon as the pumped medium), the outlet pressure may initially rise, only to suddenly drop to near the inlet pressure. This is the result of installing a steam valve on the inlet pipeline to prevent the aforementioned phenomena from occurring during pump operation. At this point, the machine should be stopped immediately, and the gas inside the pump removed using the aforementioned precautions, before starting it up again. 6.5 Check the pump and motor separately. When the pump starts, parameters such as current, voltage, lubrication level in each component, operating noise, vibration, outlet pressure, and inlet pressure should be monitored. 6.6 30 to 60 minutes after the pump is started, verify the above items again and measure the temperature of the bearings. 7 Stop the pump. 7.1 Slowly close the outlet valve until the flow rate reaches the minimum value; then open the return valve associated with the minimum flow line. Once it is confirmed that this valve is fully open, close the outlet valve completely. 7.2 Stop the motor, and simultaneously automatically close the outlet electric valve. When the pump is stopped, the interlock shuts off the hydraulic turbine cut-off valve, thereby stopping the hydraulic turbine. Automatically switch from the high-temperature high-level switch to the low-temperature high-level switch, and activate the bypass control valve. 7.3 Confirm the automatic start of the auxiliary oil pump. 7.4 Minimum flow line check valve. ** Measure the idle time to facilitate identifying the cause of feed pump failures in the future. 7.6 Due to the high temperature of the medium, which gives it crystallization tendencies, the cooling, flushing, and sealing pipelines should remain operational for some time even after the pump has stopped completely, in order to protect the O-ring of the mechanical seal. When the pump temperature is below 80°C, shut off the cooling, flushing, and sealing pipelines, and then close all valves. 7.7 Close the pump inlet valve. 7.8 Notify of power outage as required. Before stopping the pump, the hydraulic turbine can also be disconnected first, and a bypass control valve can be activated, after which the pump can be stopped following the steps mentioned above. 8 Regular maintenance of the standby pump 8.1 The suction valve of the standby pump is fully opened, the pump is filled with the medium, and a suction pressure is applied to the pump. If the pump outlet remains open, use a check valve to prevent backflow, and restart the pump under these conditions. 8.2 When the ambient temperature is too low and causes the medium transported by the standby pump to solidify, a backflow device with a flow rate of approximately 1 m3/h should be installed at the pump outlet, and it should be kept in operation. 8.3 Preheating the pump before operation: When the medium being transported has a temperature of ≥120°C, it is necessary to preheat the pump, allowing the medium to circulate from the lower part of the pump body (through the drain hole). 8.4 The pump should be checked monthly to ensure it is operating properly. Before starting the pump, manually rotate the shaft to verify that the rotor turns smoothly. If the pump is operating abnormally or is leaking, the following measures should be taken. 8.5 If the pump is running in cold conditions, the discharge valve and vent valve should be opened to completely drain the fluid inside the pump, which helps to protect the pump. 8.6 If the pump is to be idle for a period of time, the medium inside the pump should be drained. 9 Accident handling Common faults, causes and treatment methods during the operation of the feed pump are as follows: 1.2 million tons/year hydrocracking unit feed pump common fault causes, causes and treatment methods Problem causes Solution Bearing temperature or bearing oil return temperature is high Lubricating oil cooling oil outlet temperature exceeds 55°C Adjust the oil cooler oil outlet and inlet valves Check cooling water inlet temperature and water quantity Lubricating oil cooling oil outlet temperature exceeds 70°C Overhaul and clean the oil cooler The lubricating oil cooling oil outlet temperature does not exceed 55°C Check whether the lubricating oil pressure is low. Open it. Check that the bearing oil supply is insufficient. The orifice plate is small or the oil pressure is not enough. The oil supply temperature is high. Check the flow rate and temperature of the cooling water. Clean the cooler. The oil quality has deteriorated. Replace new oil. Debris has entered. Check the outer cylinder of the oil filter. The temperature difference is high. The warm pump line valve is not fully open. Open the warm pump line valve. The warm pump line valve is fully open. Is the warm pump continuous 3.5? ~4 hours before the pump, the pump inlet or turbine outlet valve is fully open. Motor stator temperature is high. Motor is overloaded. Check the motor operating conditions. Bearing vibration is high. Vibration is high. Check if the vibration probe is loose. If loose, tighten it. If the vibration alarm occurs again, stop the pump. If vibration alarm occurs again, the pump should be interlocked and self-stop. Disassemble the pump and check the center line. If necessary, dynamically balance the rotating shaft. If there is jamming, disassemble the pump or turbine, check if the internal parts are not well aligned, check for unbalanced rotor, check rotor dynamic balance, unbalanced coupling, check half coupling and extended section dynamic and static parts contact, check and measure clearance, bearing wear, increased clearance, replace shaft deformation, repair shaft displacement, high vibration, high alarm, check shaft vibration and thrust bearing vibration, high Check the shaft vibration. The lubricating oil pressure is low. The oil pump outlet pressure is low. Check the safety valve, the oil pump inlet valve and the filter. The oil pump outlet pressure is not low. Check the oil filter differential pressure. Switch the filter. The lubricating oil filter differential pressure is high. The lubricating oil pressure is high. Check the lubricating oil pressure. Clean the oil filter. The oil cooler outlet temperature is high. The lubricating oil cooling water outlet temperature exceeds 50℃. Adjust the cooling water inlet and outlet valves and check the cooling water inlet temperature. The oil cooler oil outlet temperature exceeds 70°C. Overhaul and clean the oil cooler. The hydraulic turbine speed is high. The turbine inlet valve should be fully closed automatically. Check the coupling and clutch. Mechanical seal flushing pressure is abnormal. Mechanical seal leakage has increased. Disassemble. Check the mechanical seal. Mechanical seal leakage has not increased. Check the performance of the mechanical seal charging unit. The performance of the pump has declined. Corrosion inside the pump. Replace wear-resistant parts. Seal damage. Replace the new flow channel and disassemble the carbon deposits and check the suction pressure drop. Check and clean the inlet filter. Mechanical seal leakage. Mechanical seal is installed incorrectly. Disassemble. Check the mechanical seal for wear. Replace the mechanical seal O-ring or gasket damage. Replace the new balance sleeve. The gap has increased. Check and update. The O-ring between the volute and the sealing cover is damaged. Check and update 10. Feed pump instrument alarm interlock When the operating process parameters or conditions reach the following indicators, an alarm or interlock shutdown will occur. 1.2 million tons/year hydrocracking unit reaction feed pump 1401-P-102A and hydraulic turbine 1401-HT-101 alarm list item instrument number unit alarm value dangerous value remark lubricating oil pressure PS6101A ~ 6103A MPa 0.03 lubricating oil pressure PT6103A MPa 0.06 Lubricating oil tank temperature Lubricating oil tank level Lubricating oil filter pressure difference PDT6101A MPa 0.1 Pump non-driving end radial bearing temperature TE6101A ℃ 80 90 Pump driving end radial bearing temperature TE6106A ℃ 80 90 Pump inner thrust bearing temperature TE6102A ℃ 80 90 Pump outer thrust bearing temperature TE6103A ℃ 80 90 Temperature on the pump cylinder TE6104A ℃ Δ30 Temperature under the pump cylinder TE6105A Pump outlet end shaft vibration XE6101A～6102A μm 65 90 Pump inlet end shaft vibration Gearbox high-speed pump side bearing temperature TE6109A ℃ 80 90 Gearbox high-speed motor side bearing temperature TE6110A ℃ 80 90 Gearbox low-speed pump side bearing temperature TE6107A ℃ 80 90 Gearbox low-speed motor side bearing temperature TE6108A ℃ 80 90 Turbine driving end radial shaft temperature TE6119A ℃ 80 90 Turbine non-driving end radial shaft temperature TE6122A ℃ 80 90 Turbine non-driving end thrust inner bearing temperature TE6123A ℃ 80 90 Turbine non-driving end thrust outer bearing temperature TE6124A ℃ 80 90 Turbine driving end shaft vibration XE6105A～6106A μm 75 100 Turbine non-driving end shaft vibration Turbine speed SE6101A～6102A rpm 3100 Motor gearbox side bearing temperature TE6117A ℃ 90 95 Motor clutch side bearing temperature TE6118A ℃ 90 95 Motor stator temperature TE6111A～6116A ℃ 130 150 Pump outlet flow FT0702 Pump inlet flow FT0701 Buffer tank bottom cut-off valve UV-0601 Fully closed raw oil buffer tank liquid level LIC0603 % Close hydraulic turbine cut-off valve P-102A Heat stop high score D-103 liquid level UV-0601 Close valve UV-1201, 0703 Raw oil buffer tank liquid level LIC0603 % 0.7MPa emergency pressure relief shutdown hydraulic turbine cut-off valve circulating hydrogen compressor shut down hydraulic turbine cut-off valve 1.2 million tons/year hydrocracking unit reaction feed pump 1401-P-102A list of allowed starting conditions project equipment number unit setting value remarks buffer tank bottom cut-off valve fully open 1 200,000 tons/year hydrocracking unit hydraulic turbine 1401-HT-101 permitted start-up conditions list Project equipment tag number unit setting value remarks 1.2 million tons/year hydrocracking unit hydraulic turbine 1401-HT-101 mechanical seal operating conditions list serial number project unit data 1 Seal chamber pressure MPaG 2.5 2 Isolation liquid tank pressure (min) MPaG 2.8 3 Isolation liquid tank pressure (max) MPaG 3.1 4 Accumulator precharge N2 pressure MPaG 2.6 5 Accumulator volume L 50 6 Accumulator first filling volume L 7.8 7 Accumulator pressure switch transmits low alarm MPaG 2.8 3.1 million tons/year RDS unit reaction feed pump 201-P-102ABC and hydraulic turbine 201-HT-101AB alarm list (ABC after the instrument number is omitted) Project instrument number unit alarm value dangerous value remarks Lubricating oil pressure PS8101~8103 MPa 0.03 Lubricating oil pressure PT8103 MPa 0.06 Lubricating oil tank temperature Lubricating oil tank level Lubricating oil filter pressure difference PDT8101 MPa 0.1 Pump non-driving end radial bearing temperature TE8101 ℃ 80 90 Pump driving end radial bearing temperature TE8106 ℃ 80 90 Pump outer thrust bearing temperature TE8102 ℃ 80 90 Pump inner thrust bearing temperature TE8103 ℃ 80 90 Temperature on the pump cylinder TE8104 ℃ Δ30 Temperature under the pump cylinder TE8105 Pump outlet end shaft vibration XE8101～8102 μm 65 90 Pump inlet end shaft vibration 80 90 Gear box high speed motor side bearing temperature TE8110 ℃ 80 90 Gear box low speed pump side bearing temperature TE8107 ℃ 80 90 Gear box low speed motor side bearing temperature TE8108 ℃ 80 90 Turbine driving end radial shaft temperature TE8119 ℃ 80 90 Turbine non-drive end radial shaft temperature TE8122 ℃ 80 90 Turbine non-driving end thrust inner bearing temperature TE8123 ℃ 80 90 Turbine non-driving end thrust outer bearing temperature TE8124 ℃ 80 90 Turbine driving end shaft vibration XE8105～8106 μm 75 100 Turbine non-driving end shaft vibration 3000 Disconnected coupling turbine cylinder upper temperature TE8120 ℃ Δ30 Turbine cylinder lower temperature TE8121 Turbine shaft displacement ZE8103～8104 mm 0.5 0.8 Turbine speed SE8101～8102 rpm 3100 Motor gearbox side bearing temperature TE8117 ℃ 90 95 Motor clutch side bearing temperature TE8118 ℃ 90 95 Motor stator temperature TE8111～8116 ℃ 130 150 Pump outlet flow FT0702 Pump inlet flow FT0701 Buffer tank bottom shut-off valve UV-0601 Fully closed raw oil buffer tank liquid level LIC0603 % Close hydraulic turbine shut-off valve P-102A, stop heat, high score D-103, liquid level UV-0601, close valve UV-1201, 0703, raw oil buffer tank liquid level LIC0603 % 0.7MPa emergency pressure relief, shut down hydraulic turbine cut-off valve, circulating hydrogen compressor shut down, shut down hydraulic turbine cut-off valve 3.1 million tons/year RDS device reaction feed pump 201-P-102ABC list of allowed starting conditions, project equipment number, unit setting value, remarks, buffer tank bottom cut-off valve fully open 3 100,000 tons/year RDS unit hydraulic turbine 201-HT-101AB allowed start-up conditions list Project equipment tag number unit setting value remarks 3.1 million tons/year RDS unit hydraulic turbine 201-HT-101AB mechanical seal operating conditions list serial number project unit data 1 Sealing chamber pressure MPaG 2.6 2 Isolation liquid tank pressure (min) MPaG 2.9 3 Isolation liquid tank pressure (max) MPaG 3.2 4 Accumulator precharge N2 pressure MPaG 2.7 5 Accumulator volume L 50 6 Accumulator first filling volume L 7.6 7 Accumulator pressure switch transmits low alarm MPaG 2.9 1 Number of reviewers

Should the backup pump be started first when driving, or should the main pump be used directly followed by activating the thermal turbine?