What is water intermodal transport? General steps? What should we pay attention to?

This post was last edited by 4507 on 2009-5-8 13:39. Please refer to the information in the following link: http://bbs.hcbbs.com/thread-248269-1-1.html

Preparation for the start of the device 1. Process pipeline inspection (1) Carefully inspect the pipelines in the device according to the process instrument flow chart and construction drawings. Check that the construction meets the specifications of GBJ235-82 and GBJ236-82, and that the pipeline direction and connection meet the design requirements. (2) Check the alignment of the flange of the pipeline. The gasket must be placed in the correct position without any deviation, opening or slack. The gasket material must meet the design requirements. Check that the materials of the flange bolts and nuts meet the design requirements, the bolts are installed correctly, the nuts are symmetrically tightened, and the screws are fully tightened. (3) Check that the size, grade and material of pipelines, pipe diameters and other specifications meet the design requirements. The distance between pipelines and between pipelines and equipment must be correct. The welds at the joints must have no blisters, desoldering, under-welding and other defects. (4) Check that the supports and hangers of all pipelines are installed, the fixed brackets are firm, and there should be gaps for the movable brackets. (5) Check that the orifice plates, flow-limiting orifice plates, thermometers, pressure gauges, and thermocouples on the pipeline are installed in the direction required by the design. (6) Check that the pipeline insulation and anti-corrosion meet the design requirements and the quality is qualified. (7) Check that all valves (one-way valves, traps, filters, etc.) are installed in the correct direction. 2. Valve inspection (1) Check that the valve specification, model, material, and installation position meet the design requirements. (2) Check that the flange, gaskets, and screws of the valve are fully tightened, the packing is tight, and the material meets the design requirements. (3) Check whether the valve switch is flexible. (4) Check that the safety valve is assembled according to the design requirements, the installation position is correct, the pressure is set and recorded, and there is a lead seal mark. 3. Inspection of reactors, towers, containers, and heating furnaces (1) Check that the internal components of the reactor are complete and intact. (2) Check that the inlet diffuser, outlet collector, and top distribution plate of the reactor are installed according to the design requirements. The opening size of the distribution plate (such as the number of openings, aperture, etc.) meets the design requirements and there is no blockage. (3) Check that the internal components, materials and installation of the pressure vessel are intact and meet the design requirements. (4) Check whether the container as a whole is deformed, the brackets are firm, the anchor bolts meet the requirements, and the flanges, gaskets, and washers of the manholes meet the design requirements. (5) Check that the tray handle in the tower is firm and the bolts are tightened ； The gas-liquid distributor is clean and free of debris ； The float valve is flexible and the liquid receiving pan is not blocked. (6) Check the main beams in the tower. The support beams cannot bend downward, and the upward arch must not exceed 3MM. (7) Check that the installed tower must be level, and the difference between its highest point and lowest point must not exceed 3MM 4 Inspection of cold exchange equipment. Check that the specifications, models, component materials and installation of each part meet the design requirements. Check the heads and inlet and outlet flange gaskets of each cold exchange equipment. The bolts are installed and tightened. The materials meet the design requirements. Check the steering of the air-cooling motor. The angle of the fan is correct. The belt is tight and appropriate. The fins are intact. . Fill up the lubricating oil in the running parts with the correct grade. Check that the inlet and outlet of the cold exchange equipment, pressure gauge, thermometer, vent valve, etc. are complete and installed correctly. Observe and replace. Maintenance and ease of operation. Check that the bolts and materials of the high-pressure heat exchanger meet the requirements. Special maintenance tools are complete. Check that the equipment is fully insulated. The anchor bolts and their foundation brackets are firm. 5 The inspection of compressors and pumps is based on the temperature, pressure and flow rate of the conveying medium. Check the nameplate instructions of the pumps and the equipped motors one by one to meet production requirements. It meets the inspection requirements for fire and explosion protection. The foundation of the pump is flat and the turning is flexible. The pump plugs are strictly inspected. The wheel cover, silencer cover and motor grounding wire are complete and firm. The coupling meets the requirements when rotating. Check the lubricating oil. The oil sealing system is clean and complete, not blocked or leaking, and the oil standard, oil cup and its accessories are complete. Check that all thermometers and pressure gauges have appropriate ranges and accurate indications. The required vent lines, sweeping lines, preheating lines, drain lines and other valves are complete and functional. Check that all flanges, bolts and caps, gaskets and packing materials meet the requirements. The foundation and anchor bolts are in good condition and fastened. 6. Check the instruments and their control systems. Check that the monitoring objects of each instrument meet the requirements. All local instruments have been installed as required. Check that each instrument displays correctly (liquid level, flow, pressure, temperature) Check that the special instruments (automatic interlock instruments, etc.) meet the process requirements and are sensitive and easy to use. Check that the flanges, gaskets, and bolts connecting the control valves to the pipelines are complete. The materials meet the requirements. Check the action of each control valve according to the process requirements. When manual, the switch is flexible and there is no jamming phenomenon. The on-site valve position corresponds to the signal output. Check that the air opening and air closing of the control valve meet the process requirements. There is no reverse installation. Check that the action of the self-protection chain system is flexible and accurate. Manually output the self-protection signal. Check that the action of each control valve is sensitive and relevant. The valves must be in place. 7. Overall inspection of the device. Check that the upper and lower water lines are flushed and unobstructed. Check that the fire-fighting equipment is complete and placed in the prescribed position. The fire-fighting passages are unobstructed. Check that all safety valves have been set at the prescribed values and pressures, and have constant pressure records. Check the requirements for starting work. The chemical raw materials are fully prepared and the inspection requires that the equipment is hygienic and clean, all scaffolding is removed, the ground is flat and meets the requirements, the power part has been commissioned, and all the lighting requirements of the equipment are functional. Check that the anti-corrosion insulation of the equipment and pipelines has been designed as required. Quality is qualified 8 Check outside the device to check the water supply, steam, compressed air, nitrogen, raw materials, products, dirty oil, and emergency pressure relief lines. Check that the emergency pressure relief lines are unobstructed. Check that the projects related to the device are ready (such as oil tanks, anti-flare systems, etc.) Check that the online analysis instruments are ready for production. Instrument, electrical, maintenance, fire protection and other maintenance personnel must be clear and prepared. After all items have been inspected, close all valves of the device, purge and flush the process pipelines. The purpose of flushing and purging is to remove welding slag, sediment, rust and other debris left in the pipelines during construction to prevent valves from being clogged and damage to motorized equipment during normal operation of the system. In addition, flushing and purging can help operators become more familiar with the process. The medium required for process pipeline purging requires air, nitrogen, steam and water lines. The medium used in normal production can be used to flush and purge the fuel gas pipeline. Use wind to purge the thermal oil system. Use air to purge the reaction system. Use air to purge the high-pressure raw oil line. Use air to purge the process pipeline. Flush and purge the pipelines according to the principles of purging. , must be accepted and meet the qualified standards. During the flushing process, the orifice plates, regulating valves, flame arresters, traps, burners and other easily stuck and easily blocked objects on the pipeline must be removed. Sampling valves, instrument lead valves, safety valves, liquid level gauge connection valves, and drain valves must be closed and flushed with water. When washing the pipeline, if the diameter of the pipeline is large, in order to increase agitation, an appropriate amount of compressed air can be added. During flushing and purging, it is strictly forbidden to intercept the discharge port. All discharges must be opened. Whenever the equipment is encountered, a blind plate must be added to the entrance of the container. At the entrance, a bypass can be used, and a bypass can be used if there is no bypass. When flushing and purging encounter vertical pipes, flush from top to bottom. Flush the main pipe first, then flush the auxiliary lines. If the pipeline is too long, flush in sections, and the main collecting pipe is flushed from the main pipe to the collection end. When flushing a horizontal pipeline with a valve in the middle, the flange in front of the valve should first be disassembled and closed. When flushing the valve, clean the front section, then install the flange, and continue flushing the next section to prevent debris from accumulating at the bottom of the valve. When flushing, the valve should be fully opened or fully closed. If something hinders the switch, the valve should be disassembled and inspected. If the pipeline to be flushed and purged in the reverse direction has a one-way valve, you can Remove the one-way valve and reinstall it, and reinstall it after purging. In some places, temporary pipes can be used to replace the entire system. After purging, the temporary piping and blind plates should be removed and retained as needed, and the disconnected parts should be restored to their original state. The purge and inflation pressure of all equipment is not allowed to exceed the design pressure. Process pipelines are flushed and purged. During the purging process, responsibilities must be divided into divisions, one group for each area, and one person for each pipeline. After the purging is completed, each pipeline must undergo quality inspection and acceptance. The acceptance is carried out step by step by the team and workshop. The automatic valves, flow orifice plates, etc. in the process will be flushed until they are qualified. Remove easy-to-clog objects and when encountering equipment during the flushing process, use bypasses. If there is no bypass, put a blind plate on the entrance of the equipment. To prevent purge impurities from entering the equipment, all original parts have been removed and all blind plates have been installed. After all the blind plates are installed, purging can be carried out as required (the blind plates must be responsible for it by a dedicated person and numbered and listed) During the purging process, after the front section of the pipeline has been purged and passed the test, the removed objects can be installed. After the purge water of the next section of the pipeline has passed the purge water, remove the water joint and connect the compressed air to purge until it is dry. Precautions for flushing and purging of process pipelines. During the flushing and purging process, pay attention to the surrounding environment when discharging to avoid injuring people. When cleaning, first use the purging medium to clear the pipeline, then gradually increase the pressure and increase the flow rate. When flushing, use a hammer to hit the blind plate in the boundary area. If you need to remove the blind plate, you must contact us in advance before the blind plate can be removed. After purging begins, you must first purge the medium pipeline and container to ensure that the purged medium is clean. Contact the instrument personnel to connect the instrument branch line. Sweep first, once the main line has been swept. After acceptance, the instrument branch line is not allowed to be swept into the main line to re-contaminate the pipeline. The purge medium should not pass through the pump body as much as possible. If it must pass through, it must be approved by the equipment personnel. Reverse blowing of the pump process pipeline is not allowed. The purge acceptance standard. The flushing water shows its true color, and there is no impurity. The purge gas is released without pollutants and dust. , the purpose of rust purging is determined by the purpose of water intermodal transportation, and the pipelines and equipment are further flushed and connected to ensure that the pipelines and equipment are unobstructed, clean and rigorous to further inspect the construction quality of dynamic equipment and static equipment. The reliability of technical performance, it is easier to solve problems found, and it is easier to inspect the stability and sensitivity of system instruments, regulating valves and material balance. Simulate start-up operations for technical training. Familiarize yourself with equipment performance and operating methods and collaboration between positions. Customize the conditions for water combined transport in the area. The equipment has been purged. All existing problems have been dealt with. All dismantled parts have been reset. The single machine trial operation has been completed. It is confirmed that the pump has no problems and can be put into normal operation. Water combined transport can be carried out when the above conditions are met. Water combined transport precautions Water quality requirements: Treated clean water must be used to participate in water combined transport. The pump of water combined transport must be well lubricated. When switching to a standby pump, all instrument systems that can be put into use should be put into use and the switching operation should be performed to examine its performance and sensitivity. Pay attention to adjusting the flow, pressure, and liquid level. Master the dynamic balance and material balance of each system. Pay attention to the pump, instrument, and equipment operation. If problems are found, a filter should be added to the pump inlet, and if a blockage is found, clean it in a timely manner. Systems that do not require water transport should be isolated with blind plates or valves to prevent the intrusion of water (a dedicated person must be responsible for the blind plate, and a sign must be posted for records) After the water transportation is completed, each system must drain the stored water and use wind or nitrogen to sweep the water clean. When draining the water, the empty valve should be opened first to prevent vacuum damage to the equipment. The blind plates, temporary lines, and filters added during water transportation should be removed. The normal process of water transportation should be restored. The purpose of the drying oven is to customize the heating furnace drying plan for the water transportation process. In order to slowly remove the moisture during the furnace wall masonry process and ensure that the refractory mortar is fully sintered, the oven can also test the steel frame, foundation, chimney and its components for deformation and defects. Test whether the process operation indicators of the heating furnace meet the design requirements. Preparation before the oven. Understand the original construction conditions of the heating furnace. Inspection Check the project quality acceptance form, and ask the construction unit to introduce the quality of all civil construction and installation projects. After the heating furnace is completed, all manholes, explosion-proof doors, fire doors, and flue baffles should be opened for natural ventilation for more than 5 days. Check the installation of the temperature measuring components of each part of the heating furnace. Check that the positions are correct and not offset. Check whether the furnace wall is flat, whether there are cracks or gaps, and the quality of the chimney lining. Check whether all components of the heating furnace, including flue baffles, explosion-proof doors, and manholes, are installed. Check whether the sealing of the fire door is good and whether the movable parts are flexible and easy to use. Check whether there are any leftovers inside the furnace and whether there are obstacles or flammable materials outside the furnace. Check whether the fire-fighting steam and other fire-fighting appliances are flexible and easy to use. Check the original record of the furnace tube test. Check whether the pressure test is qualified. Check the fuel construction quality and system purge and pressure test. Whether the flame arrester is installed and whether the flame arrester net meets the requirements. Check whether the inlet and exhaust temporary lines for heating furnace drying are installed. Whether the 8-shaped blind plate at the inlet and outlet is blind. The 8-shaped blind plate on the vent line is opened. Check the installation of the air preheater, the installation of the induced draft fan and whether it is in trial operation. Qualified. Before drying, the induced draft fan should be started for forced ventilation for 8 hours to check whether the temperature measuring instrument used in the oven is functional. Understand the 0.4MPA steam supply, steam temperature, pressure and whether the steam is sufficient. Prepare recording paper, graph paper and other recording tools. Drying steps: Before supplying steam to the steam heater, remove the cooling water and then slowly introduce the steam heating pipe to prevent water hammer and sudden temperature rise. Before the heater reaches 120 degrees and the fuel gas is introduced, blow the fuel system. Clean the replacement, change the process and notify the instrument engineer to start the fuel system and control the instruments, and debug it. Open the main gas valve to introduce gas to the front of the furnace. Use a combustible gas alarm to measure the bottom of the furnace. The combustible gas concentration in the middle can be ignited if it is less than 0.3%. If it is greater than 0.3%, turn on the fire steam to replace the furnace. At this time, the flue baffle should be fully opened and purged for about 15 minutes. The chimney will be ignited until white smoke is emitted. Before ignition, open the flue baffle to one-third. First, light the continuous light , after the combustion is stable, use the ignition nozzle to heat up according to the temperature rise curve after ignition. To prevent the temperature from rising suddenly too fast, start the induced draft fan after ignition and adjust the air volume. The temperature rise curve is normal temperature ------- 150 degrees 6/hour 150 degrees constant temperature 48 hours 150-------- 350 degrees 8/hour 350 degrees constant temperature 48 hours 350 ------- 550 degrees 10 hours 550 degrees constant temperature 24 hours 550 ------- 200 degrees 15 hours. The specific drying time depends on the drying conditions. Stop the steam heating furnace when the temperature drops to 200 degrees. After the fire ceases, open the fire hole, the air duct baffle, stop the induced draft fan, and natural ventilation to cool the oven. Precautions for drying Uniform and symmetrical ignition when igniting the nozzle. The flame nozzle is required to have a short flame and a uniform flame. To prevent the flame from being too long and directly hitting the furnace tube, causing local overheating, the furnace negative pressure must be controlled during ignition and normal combustion. Positive pressure ignition and operation under positive pressure are strictly prohibited. During the drying process, the furnace body, chimney, furnace tube, and supports and hangers should be checked frequently to see if they are normal and whether there are cracks or deformations. In case of serious situations, they should be reported immediately, handled in time, and recorded. During the drying process, if steam or fuel gas is interrupted and the supply is temporarily unavailable, the gas valve entering the furnace should be closed immediately. The steam valve entering the furnace should be closed, and the damper and flue baffle should be closed to maintain heat. After the fuel gas and steam are restored, re-ignite and heat up the furnace. After drying is completed, technical personnel should be organized. The personnel and the person in charge of the construction unit jointly inspect the heating furnace according to the specifications and record it. If any construction quality problems are found, negotiate with the construction unit and perform repairs on the heating furnace. Prepare for ignition and inspect the furnace tubes and smoke. Check whether the flue baffle, fire hole, damper, pressure gauge, temperature measuring element, flame arrester, etc. are intact, and adjust the burner. The flue baffle and damper will lead the fire steam to the fire points in front of the furnace. Pay attention to the condensation when introducing air to prevent water splash inspection. Check the blower. Check whether the blower is in good condition and add lubricating oil. If the cranking is good, contact the instrument engineer to check the regulating valve and automatic control instrument, and start the debugging if it is qualified. Prepare fire-fighting equipment and ignition tools to guide the fuel gas to the front of the furnace. First, draw the fuel gas. Use steam or nitrogen to purge and replace the fuel system. The time should not be less than 30 minutes. During the purge, condensation must be drained from each low point to prevent clogging. After purging, the water in each container pipeline must be drained, the fuel gas flow must be improved, and the fuel gas must be directed to the front of the furnace. Open the flame arrester inlet and outlet valve, adjust the air duct baffle of the ignition nozzle, close the air duct of the burner that is not lit, and adjust the opening of the flue baffle to half. The furnace negative pressure is not less than 8MM water column. In the ignition step, use a combustible gas alarm to measure the bottom of the furnace. If the concentration of combustible gas in the middle is less than 0.3%, it can be ignited. If it is greater than 0.3%, open the fire steam to replace the furnace. At this time, the flue baffle is fully opened. , purge for 15 minutes, until you see white smoke coming out of the chimney, start the induced draft fan, and adjust the flue baffle and air inlet volume so that the furnace is under negative pressure. The ignition is operated by two people. First, open the gas valve of the continuous lamp entering the furnace, move the fire source from the ignition hole to the continuous lamp, open the gas valve of the continuous lamp mouth, ignite the continuous lamp, wait until the continuous lamp burns normally, then open the secondary line valve of the fuel gas into the furnace control valve, and finally open the fuel After the gas inlet burner valve is ignited and the burner is ignited, according to the flame conditions, appropriately adjust the air duct baffle, flue baffle, and fuel gas valve opening. After the combustion is normal, the fuel gas furnace front control valve can be moved from the auxiliary line to the regulating valve to achieve automatic control. When changing the valve, strengthen the connection between indoor and outdoor, pay attention to controlling the furnace temperature, and pay attention to the furnace negative pressure. Change the furnace negative pressure to automatic control. Wait for the fuel system to be completed After fully realizing automatic control, check the fuel gas pressure, the liquid level of each container, the furnace negative pressure, and whether the furnace temperature is within the control indicators. Precautions for ignition. If the primary ignition fails, the fuel gas valve should be closed immediately, and the furnace should be purged and replaced with steam for more than 5 minutes. The second ignition can only be started after the chimney has seen steam. When igniting, the operator should deviate from the ignition hole, damper and check the goods to prevent backfire and hurt people. When igniting, the furnace negative pressure is not less than 8MM water column. If it is too small, it will easily backfire, and if it is too large, it will easily extinguish the fire. It is not allowed to ignite under positive pressure. The burner must be symmetrical to prevent uneven distribution of the furnace stability and cause local overheating of the furnace tube. Generally, the discharge of liquefied gas is not allowed. [Pay attention when discharging condensation. When you see liquefied gas, you should immediately close the valve. Normal operation of the heating furnace and adjust the signs of normal combustion of the heating furnace: the flame is blue when burning liquefied gas, the furnace is bright and clean, the chimney does not emit black smoke, the flue gas is light blue or colorless, and white in winter, the flames are the same size and do not interfere with each other. The flame does not cause oil stars or blows on the furnace tube. It is necessary to have multiple burners, short flames, and uniform flame passing furnace outlet temperature and fuel gas flow rate; the two regulators are cascade adjusted to control the furnace outlet temperature at about 2°. According to the increase or decrease in the load of the heating furnace, the opening and number of the burners should be adjusted in time to prevent the furnace tube from overheating and coking, and to maintain the furnace body. For equipment, the furnace temperature is not allowed to exceed the maximum rated temperature, and the heating furnace is not allowed to be overloaded. The fuel gas pressure must be stable and should be controlled at around 0.3MPA. When insufficient or fluctuating pressure is found, it must be adjusted in time to avoid furnace temperature fluctuations. Adjust the flue baffle and air inlet volume to maintain a negative pressure of 4M in the furnace. The M water column adjusts the three doors and one plate to completely burn the fuel and control the excess air coefficient between 1.2 and 1.3. If the air coefficient is too large, the amount of air entering the furnace will be too large, and the temperature of the furnace will drop, affecting the heat transfer process of the furnace, causing too much flue gas, taking away a lot of heat, wasting fuel, and excess O2 It will also corrode the surface of the furnace tube, causing the surface of the furnace tube to oxidize and peel. The excess air coefficient is too small, the air required for combustion is insufficient, and the combustion is incomplete, which wastes fuel. Keep the two groups of feed evenly, and the outlet temperature difference of the two groups is less than 5°/To prevent uneven distribution and coking, the burner that stops burning should pass a small amount of steam to prevent the burner from coking or burning. Routine inspection of the burnt burner heating furnace. Regularly check the fuel system pipelines, valves, flanges, gasification tanks, buffer tanks, liquid storage tanks, etc. for leaks, blockages, corrosion phenomena/fire arrester pressure difference. Whether the heater is normal. Regularly clean the flame arrester or replace the flame arrester net. Regularly drain the liquid separator tank and check the furnace body and fire resistance. Bricks, furnace tubes, supports and hangers, directional tubes. Whether the steel structure is deformed, damaged or overheated. Check whether each burner burns normally. Whether the burner nozzle hole is blocked. High. Or the pressure difference in one group is too large, indicating that there is a possibility of coking in the furnace tube. The two groups of flow should be adjusted in time to make the flow even and check the working conditions of each regulating valve, positioner and control instrument. Whether the change of wind pressure is normal. Whether the regulating valve is sensitive. Check whether the opening of the damper and flue baffle is appropriate. Whether the furnace negative pressure is normal. Check whether the preheater and induced draft fan are working normally. Whether the lubricating oil of the fan is sufficient. Whether the air preheater tube bundle is corroded and perforated. If perforations are found, stop using them in time. Change to natural wind device for airtight replacement. Purpose: Carry out pressurization inspection with wind or nitrogen to find leaks, take measures to eliminate hidden dangers, and ensure the safe start-up and periodic operation of the device. Preparations for the air tightness test should be as follows: Check whether the catalyst filling of the reactor is completed. Before painting and heat tracing of the pipeline, each instrument is in standby mode. Whether all temporary facilities and materials have been dismantled. Whether all public works can be put into use. Whether all equipment is ready for operation. Air tightness qualification standards: 24-hour leakage rate ≤ 0.5% is the qualified air tightness assessment standard: Tools and consumables required for air tightness are qualified if no leaks are found. Small bucket, ear cleaning ball, washing powder or soap, detergent, shampoo, stone pen, notebook, air tightness steps. Air tightness before filling the catalyst: The reactor is filled with compressed air to 0.6MPA for leakage inspection. Use soapy water to check and observe whether there is leakage. After confirming that the system is sealed, use N2 to raise the system pressure to above 0.98MPA. All flanges are tested for airtightness after filling. Airtightness testing after catalyst filling is performed. Use N2 to replace the reactor. Inspection methods and precautions. Airtight points include equipment. Equipment, flanges, valves, vents, pressure gauges, liquid level gauges, unions, and pressure, flow, temperature, and thermocouple connection points. The low-temperature section of the welding joint. Use the N2 line to check leaks with soapy water. Use a gas detector to check the high-temperature section. During the pressure increase process, the speed cannot be too fast, and the difference between the inlet and outlet of the cycle machine is controlled at 1.0MP. Air-tight inspections of A or below must be carried out by designated persons, fixed points, and constant pressure inspections. Keep records. To prevent missed inspection points, unified command should be unified during the air-tightening process, and the interconnection between positions should be strengthened to ensure safety. During the air-tightening process, if a large leak is found, the pressure should be stopped and the pressure should be reduced to a safe working pressure or normal pressure. Small leaks should be marked on site and recorded. After recording and depressurizing, handle the operation of the water ring vacuum pump in a unified manner. Preparations before starting. Contact an electrician or fitter. Do a good job of inspection and check whether the pump inlet pipeline, flange, valve and pressure gauge are installed correctly. Whether the anchor bolts, grounding wires and other connections are firm and whether there is any looseness. Check whether the bearing chamber is filled with lubricating oil (2/3) Open the valve on the water supply pipeline and fill the pump outlet separation tank with water. Open the valve on the pump water seal line of the separation tank, water seal the pump body, open the cooling water of the heat exchanger, and ensure the temperature of the incoming water. Close the valve on the air inlet line. When starting the vacuum pump, pay attention to the forward and reverse rotation of the motor. After supplying water to the pump body, start the motor immediately. When the pump reaches the ultimate vacuum, open the valve on the air inlet road, and the pump starts to work normally. Use the air inlet valve to adjust the vacuum water ring of the system. Stop the vacuum pump, close the valve on the air inlet line, and close the water supply pipeline. After the water is stopped, let the pump continue to run for 1-2 minutes to remove part of the condensate. Shut down the motor. Maintenance of the water ring vacuum pump. Press in the packing regularly. If the packing cannot be maintained due to wear and tear, it should be replaced with new packing. The packing should not be pressed too tightly. , the normally compressed packing allows water to leak out in droplets. The temperature of the ball bearing cannot be higher than 70°. The grease in the bearing chamber should be filled up. Common faults and solutions of water ring vacuum pumps. Causes of faults and solutions. Insufficient air pumping. The gap is too large. Adjust the gap packing. If there is air leakage, tighten it or replace the packing. If the water ring temperature is high, increase the water supply volume and reduce the water supply temperature. If there is air leakage in the pipeline system, tighten the flange bolts and replace the gasket or repair the cracks. If the vacuum level decreases, the packing will leak. Tighten it or replace the packing. If the impeller side cover gap is too large, replace the gasket and adjust it. The water ring heats up and reduces the water supply temperature. Insufficient water volume increases the water supply volume. Friction and heating of parts adjust or reinstall the water ring. The temperature rises and vibrates or makes noise. Loose anchor bolts. Tighten the anchor bolts. There is foreign matter in the pump. Grind and stop the pump. Check and remove the foreign matter. The blades have fallen off and replace them. Impeller cavitation, open the suction pipe, valve, bearing heat, insufficient lubricant, check the lubricant condition, refill, the packing pressure is too tight, loosen the bolts of the packing gland properly, no sealing water is supplied or the amount is insufficient. Supply sealing water or increase the amount of water. The bearing, shaft or bearing frame is too tight. Adjust the fit between the bearing and the shaft or the bearing frame. The clearance of the outer ring is too small and friction occurs. It is difficult to start. After the pump has been shut down for a long time, there is rust in the pump. Turn the impeller with hands or tools several times. The packing is too tight and loosen the bolts of the gland. The impeller is eccentrically worn with the pump body or disc. Reinstall and adjust.

To put it simply, water is used instead of raw materials to test the car and open up the process.

Water intermodal transportation means that in the early stages of a new installation, water is used instead of raw materials for trial operation. The main reason is that the equipment and pipelines are dirty when the operation is started. Through water intermodal transportation, water is washed, the dirt is removed through the filter, and the process is opened up to find out whether there are defects in the process. However, due to the difference in density between raw materials and water, be careful that the liquid levels in each tank and tower are not accurate, and the pumps should be careful about overloading.

However, it should be noted that water combined transport can only be used in systems using liquid media. Systems using gas phase media must not be used for water combined transport.

For newly built or extensively overhauled equipment, there are a large number of impurities, welding impurities, rust and other contaminants in the process pipelines. These impurities need to be thoroughly cleaned before feeding into production. Water needs to be used as a medium to open up the process and establish a cycle to achieve the purpose of initially testing the equipment performance and cleaning the pipelines. Things to note about water transport: 1. Confirm that the construction of the process pipeline has been completed, the pump is powered on and is in good condition, and the drain valve on the pipeline is closed. ； 2. Carefully check the process flow to ensure smooth flow and prevent pressure on the pump due to different processes. ； 3. During water combined transportation, be sure to open the regulating valve and the auxiliary line of the heat exchanger, and flush the dead corners. ； 4. During the water combined transportation, due to the difference between the medium density and the oil density during normal production, the liquid level indication of each flow rate will be deviated. Internal and external operations must be closely coordinated to prevent the tank from being full or the pump from being emptied. ； 5. After the water combined transport is completed, open the grid pump inlet filter to clean, check the water combined transport effect, and open the low point to drain the water in the system as cleanly as possible. If necessary, special equipment needs to be dried with industrial air. ； 6. During water intermodal transportation, some special equipment (such as raw material filters) need to be routed across the line.

Why can it be flushed with water if the gas-phase medium is transported by water?

Water intermodal transportation means using fresh water instead of raw materials and following the normal operation process. The main purpose is to check the air tightness of the equipment, whether the instrument is easy to use, and to flush out the remaining dirt in the equipment.

The main function of water combined transport is to test the performance of the system. The concept of water washing and impurity removal is wrong, because before the water combined transport, the system pressure test, purging, leak detection, flushing and other work have been completed. It would be strange if all the instruments are not damaged if the combined transport does this work. In addition to replacing the working medium with water, the other indicators of water combined transport The standard must be carried out according to normal driving conditions, including pressure, temperature, and flow, to open up the entire process flow, and check whether the performance of each equipment, instrument (including automatic control valves), and electrical meets the requirements. Do as the operating method requires. Another important role is to exercise the operating skills of the operator. There are a few points that need to be paid attention to.: 1. Requirements for water quality used: If it is stainless steel equipment, the requirements for chloride ions are relatively strict, and pure water is generally used as the medium. 2. Operators are required to strictly follow normal driving procedures (operating procedures), and any operating errors must be dealt with seriously. 3. Records of various parameters must be kept. 4. Managers must be in place.