Hydrogenation unit hydraulic turbine pump

I searched on Baidu; is it useful? Maintenance and Repair 5.1 Key Points for the Repair of Hydraulic Turbine Auxiliary Equipment (1) Conduct a visual inspection to check for rust on the oil tank. All weld joints and flange sealing surfaces should be free from defects such as leaks, cracks, or deformation, and the inner surface of the oil tank should be free from rust, slag, or dirt. Also, inspect the inner surface of the tank for any cracks or deformations. (2) Clean the scale buildup in the tube side of the oil cooler, check for any defects such as corrosion or leaks at the joints between the tubes and the tube sheet, inspect the casing and end caps for signs of rust, and conduct hydraulic tests on a regular basis; also check and replace the gasket. (3) Inspect the filter element to ensure it is intact, and check and replace any aged or damaged sealing rings. (4) Disassemble and inspect the main and auxiliary oil pumps, and carry out maintenance in accordance with the relevant maintenance specifications for gear pumps, screw pumps, or centrifugal pumps. (5) For accessories such as check valves, safety valves, and control valves in the oil system, they should be inspected and adjusted every time the machine undergoes major maintenance. (6) Inspect and clean the mechanical seal flushing fluid pipeline, eliminate leakage points, and remove scale and debris. 5.2 The safety precautions for the commissioning of hydraulic turbines are as follows: (1) Thorough preparation must be carried out in strict accordance with the commissioning plan and the equipment’s operating procedures before starting the commissioning process, and it should only be undertaken once all conditions are met. (2) During maintenance work, it is necessary to ensure that all tasks are completed, all materials are cleared away, and the work area is tidy, so as to guarantee that there are no obstacles at the site where testing takes place. (3) When conducting tests, the relevant personnel must be present at the same time. (4) After starting up, the operating condition of the equipment should be carefully checked, such as vibration, bearing temperature, and operating noise. If any abnormalities occur, the machine should be stopped immediately for inspection; it can only be restarted after the cause has been identified and resolved. 5.3 Safety precautions for hydraulic turbine maintenance (1) Before the equipment is handed over for maintenance, it is necessary to contact the process engineers; the equipment must be depressurized in strict accordance with safety regulations, and proper handling must be carried out by designated personnel. Only after obtaining a \"Safety Maintenance Permit\" can the maintenance work proceed. (2) The disassembly and assembly of equipment, as well as the placement and maintenance of its components, should be carried out in accordance with relevant requirements, ensuring scientific and civilized maintenance practices. Brute force should be strictly avoided to prevent maintenance accidents that are not necessary. (3) When cleaning parts with kerosene or gasoline, fire prevention measures must be observed; if welding is required, a welding permit must be obtained and appropriate safety measures taken. (4) When disassembling components, the main parts should be properly marked; if printing with steel letter heads is required, it must not be done on the mating surfaces or sealing surfaces. (5) The maintenance center must pay attention to personal safety and take strict precautions to prevent accidents such as injuries, falls, and electric shocks. 5.4 Key points for the maintenance of hydraulic turbines: (1) Bearing temperature – The allowable temperature for bearings during normal operation is no more than 65 degrees for sliding bearings, and no more than 70 degrees for rolling bearings. If the bearing temperature is high, apart from any issues with the bearing’s manufacturing and maintenance, the quality of the lubricating oil and the amount of oil supplied are the main causes. (2) Vibration: There are many reasons that cause vibration in hydraulic turbines, such as poor alignment, rotor imbalance, fluctuations in the process system, bearing failures, and loose foundation bolts. If vibration occurs, the phenomenon should be analyzed to identify the main cause of the vibration and take measures to eliminate it. (3) Machine noise: Use tools to assess the sound emitted by the machine. If there are sounds of metal hitting against each other, noises associated with liquids, or screeching sounds from components, it is necessary to determine whether these noises are caused by the manufacturing process or by the machine itself, so that they can be eliminated. (4) Flushing: It is necessary to ensure that the flushing fluid pipeline is unobstructed and that the pressure remains above the specified level; sufficient amounts of cooling flushing fluid should be available in order to extend the service life of the mechanical seal. 5.5 Inspection and maintenance of hydraulic turbine casings – Inspection items: (1) Check whether there is corrosion, erosion, or significant thinning of the wall thickness in the turbine casing’s flow channels; the surface of the flow channels should be smooth, without any casting defects, and welding repairs may be carried out if necessary; (2) The contour lines of the flow channels should be symmetrical with respect to the center line, with a tolerance of 0.50 mm/100 mm; (3) The gland rings of the casing should not be loose, their wear-resistant layers should be intact, and they should be concentric with the axis of the volute, with a tolerance of 0.02 mm/100 mm; if necessary, both gland rings on each side should be replaced at the same time; (4) After reassembling the upper and lower casings, the mating surfaces of the flow channels should be aligned properly, without any misalignment; the connection bolts must be tightened evenly to prevent deformation of the bearing housing; (5) A hydraulic test at 1.5 times the operating pressure should be conducted for 30 minutes, with no leakage allowed.

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