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In chemical plants, instruments are the main basis for monitoring the operating status of the equipment, and their parameters are extremely important for safe production and the output of qualified products. Therefore, the inspection of chemical instruments is not as simple as clicking a button, hanging a sign, and signing a document. The key issue is to check for hidden dangers, eliminate risks, and ensure the quality of chemical products. Otherwise, chemical equipment with complex processes and high-speed operation of equipment will cause leaks and leaks from time to time. Various safety hazards will also arise one after another. The production of substandard products will also cause huge economic losses to the enterprise. What are the main tasks of instrument inspection? The main task is to detect abnormal conditions of the instrument in time to avoid system shutdown, accidents and the production of substandard products. In actual chemical production, it varies depending on the industry and process, but the general requirements should be: Abnormalities in production equipment can be discovered and handled in a timely manner to ensure stable production operation. What are the main specifications for instrument inspection? 1. On-site inspections must be equipped with three-in-one alarms and other labor protection supplies ； 2. All instruments and equipment that have been inspected should have clear, obvious and correct serial numbers. ； 3. Check whether there is air leakage from the air source of the pneumatic control valve. Check the appearance of the instrument to see if the parts are complete and damaged, and whether the valve adjustment stroke is normal and whether there is any noise. ； 4. Check whether the seals of the temperature transmitter cover and junction box are aging, whether the detection components are grounded, whether the bolts are complete and firm, and whether there is leakage in the primary connection. ； 5. Whether the pressure transmitter, pressure transmitter and pressure guide pipe are sealed well and leak-free, and whether the insulation and heating are normal. ； 6. Whether the opening, closing and valve position indication of the pneumatic cut-off valve are normal, whether there is air leakage from the air source, and whether there is any noise ； 7. Whether the flow meter display is normal, whether the insulation and heat tracing conditions are in good condition (winter) and there is no leakage ； 8. Whether the appearance parts of the analyzer are complete and whether they are damaged: The terminals are pressed tightly, running well, and no alarm occurs. ； 9. The flange connection of the liquid level transmitter is well sealed and has no leakage. ； Display normal, whether the insulation and heat tracing conditions are good (winter), no leakage ； 10. Check the appearance of the combustible gas alarm to see if the parts are complete and damaged, the appearance should be clean, there is no power loss, and there is no abnormality in the display. ； 11. Are the connections and wiring of the shaft system instruments of each major unit reliable, are there any alarms, and are the trend fluctuations normal? ； 12. All instruments on site display accurately, and the instruments and equipment are hygienic and clean, with no leaks, leaks, or leaks. ； 13. According to the inspection plan, the instrument inspection work must be completed carefully on time and by location (part). ； 14. All instruments and equipment that have been inspected during inspections should be clean and tidy. 15. Inspections and equipment should be inspected during inspections, especially regulating valves, instrument measurement leads, and instruments installed directly on pipelines to see if there are any threats of hazards such as vibration. 16. Inspection of spare equipment should be done every day (such as the spare main fan of the catalytic unit, the spare reciprocator of the atmospheric and vacuum/hydrogen production/continuous reforming/diesel hydrogenation/hydrogenation treatment unit, the spare fan of the sulfur recovery unit, the spare screw compressor of the atmospheric and vacuum/gas tank, etc.). 17. The content of inspections must strictly comply with the requirements of the "Inspection Rules", but is not limited to the scope of the "Inspection Rules". Each maintenance unit can increase the content and frequency of inspections and inspections based on the specific operation conditions of instrument equipment. Inspections and inspections must be strengthened for key parts and instruments with frequent failures to ensure the normal operation of each instrument and the safe production of the device. 18. All instruments and equipment inspected during inspections should have clear, obvious, and correct serial numbers, including necessary serial number descriptions. 19. Fill in the inspection record carefully in accordance with the contents of the inspection record form and the requirements of this "Inspection Rules". Specific inspection requirements for instruments and control systems: 1. Pressure and differential pressure transmitters 1. Check whether the pressure and differential pressure transmitters are intact. 2. Check whether there are leaks on the instrument measuring leads and static sealing points. 3. Check whether the instrument measuring leads, the isolation/venting/sewage valve switch status of the flushing liquid/isolation liquid lines are correct, and whether the venting pipe caps/wire plugs have been tightened. 4. Check the insulation and heat tracing of the instrument measuring leads (if any). 5. Check the waterproof condition of the pressure and differential pressure transmitters. 6. Check whether the pressure and differential pressure transmitters are exposed to hazards such as vibration. 7. Check whether the measurement value of the transmitter is consistent with the local (near) measuring meter (such as a pressure gauge, differential pressure gauge, etc.). 2. Pressure/ Differential pressure switch 1. Check whether the pressure/differential pressure switch is intact. 2. Check whether there is a leakage point on the instrument measurement lead and at the static sealing point. 3. Check the waterproof condition of the pressure/differential pressure switch. 4. Check whether the pressure and differential pressure switches have vibration and other hazards. 5. Check whether the instrument measurement lead, the isolation/venting/drainage valve switch status of the flushing liquid/isolation liquid line are correct, and whether the venting pipe cap/wire plug has been tightened. 6. Check the insulation and heat tracing of the measuring lead (if any) 3. Temperature transmitter 1. Check whether the temperature transmitter is intact 2. Check the waterproof condition of the temperature transmitter 3. Check whether the temperature transmitter has any hazards such as vibration 4. Check whether the measurement value of the temperature transmitter is consistent with the local (near) measurement meter (such as a bimetal thermometer, etc.) 4. Float liquid level/ Interface level transmitter 1. Check whether the float level/interface level transmitter is intact. 2. Check whether the float level/interface level transmitter has leaks. 3. Check whether the measurement value of the transmitter is consistent with the indication value of the local indicator (such as glass plate/glass tube/magnetic flap level meter, etc.) and other measuring instruments in the same measuring position (such as double flange transmitter/magnetic float transmitter). 4. Check whether the switch status of the float isolation valve and the vent/sewage valve is correct, and whether the vent pipe cap/plug has been tightened. 5. Check the waterproof condition of the float level/interface level transmitter. 6. Check the float level/interface level transmitter for vibration and other hazards. 7. Check the insulation/heat preservation/heat mixing condition of the float level/interface level transmitter cylinder (if any). 5. Float level/interface level transmitter Interface switch 1. Check whether the float level/interface switch is intact. 2. Check whether the float level/interface switch has leaks. 3. Check whether the float isolation valve and the vent/sewage valve switch status are correct, and whether the vent pipe cap/wire plug has been tightened. 4. Check the waterproof condition of the float level/interface switch. 5. Check the gas phase condition of the upper part of the cylinder of the float level/interface switch (to determine whether there is a "gas collection" problem) 6. Check the heat insulation/heat preservation/heat mixing condition of the float tank liquid level/interface level switch (if any) 7. Check the float level/interface level switch for hazards such as vibration. 6. Float level transmitter 1. Check whether the float level transmitter is intact. 2. Check the waterproofing of the float level transmitter. 3. Check whether the float level transmitter has leaks. 4. Check the fixation of the weight slider of the float level transmitter. 5. Check the transmission and lubrication of the transmission part of the float level transmitter. Add high-temperature resistant lubricating oil (grease) as needed. 7. Mass flow meter 1. Check whether the mass flow meter is intact 2. Check whether the mass flow meter has leaks 3. Check the waterproofing of the mass flow meter 4. Check the vibration of the mass flow meter along with the process pipeline 5. Check whether the status alarm of the mass flow meter is normal and whether the measurement working status is normal (such as whether the flow measurement value, density measurement value, temperature measurement value is within the normal range, etc.) 8. Pipeline vortex street/pipeline turbine/pipeline electromagnetic/ Insertion electromagnetic flowmeter 1. Check whether the pipeline vortex/pipe turbine/pipe electromagnetic/insertion electromagnetic flowmeter is intact. 2. Check whether the pipeline vortex/pipe turbine/pipe electromagnetic/insertion electromagnetic flowmeter has leaks. 3. Check the waterproof condition of the pipeline vortex/pipe turbine/pipe electromagnetic/insertion electromagnetic flowmeter. 4. Check whether the status alarm of the pipeline vortex/pipe turbine/pipe electromagnetic/insertion electromagnetic flowmeter is normal and whether the measurement working status is normal (such as whether the flow measurement value is within the normal range, etc.) 9. Ultrasonic flowmeter 1. Check whether the ultrasonic flow meter is intact 2. Check the waterproof condition of the ultrasonic flow meter 3. Check whether the ultrasonic flow meter probe is connected and fixed firmly 4. Check whether the ultrasonic flow meter status alarm is normal and whether the measurement working status is normal (such as whether the flow measurement value and flow velocity measurement value are within the normal range, etc.) 10. Ordinary control valves 1. Check whether the control valve and accessories are intact 2. Check whether the air supply pressure of the control valve positioner/electrical converter is correct and waterproof 3. Check whether there are leaks in the air source and signal pipeline of the control valve, and whether the joints are tightened well 4. Check the control valve positioner Whether the connection between the feedback rod and the control valve stem is firm, and whether the signal air pressure corresponds to the valve opening. 5. Check whether there is leakage at the flange and packing of the control valve. 6. Check whether the position of the handwheel of the control valve is correct. 7. Check whether the control valve and its accessories have vibration and other hazards and threats. 11. adjust/ Interlock valve 1. Check whether the regulating/interlocking valve and accessories are intact. 2. Check whether the air supply pressure of the regulating/interlocking valve positioner/electrical converter is correct and waterproof. 3. Check whether there are leaks in the regulating/interlocking valve air source and signal pipeline, and whether the joints are fastened well. 4. Check whether the connection between the regulating/interlocking valve positioner feedback rod and the regulating/interlocking valve stem is firm. , , whether the signal air pressure corresponds to the valve opening. 5. Check whether there is leakage at the flange and packing of the regulating/interlocking valve. 6. Check the installation, fixation and waterproofing of the solenoid valve for the regulating/interlocking valve. 7. Check the connection and waterproofing of the regulating/interlocking valve position feedback switch and the valve stem. 8. Check whether there are any hazards and threats such as vibration in the regulating/interlocking valve. 12. Interlocking/ Switch valve 1. Check whether the interlock/switch valve and accessories are in good condition. 2. Check whether the air supply pressure of the interlock/switch valve is correct, whether there are leaks in the air source and signal pipeline, and whether the joints are tightened well. 3. Check whether the interlock/switch valve signal air pressure and valve opening are correct. Correspondingly 4. Check whether there is leakage at the interlock/switch valve flange and packing 5. Check the installation, fixation and waterproofing of the solenoid valve for the interlock/switch valve 6. Check the connection and waterproofing of the interlock/switch valve position feedback switch and the valve stem 7. Check the interlock /Whether there are vibration and other harmful threats to the switch valve 13. Hydroprocessing XV interlock valve 1. Check whether the XV interlock valve and accessories are intact 2. Check whether the air supply pressure of the (maximum value), whether there are leaks in the air source and signal pipelines, and whether the joints are well tightened. 3. Check whether the signal air pressure of the XV interlock valve corresponds to the valve opening. 4. Check whether there is leakage at the flange and packing of the XV interlock valve. 5. Check the solenoid valve for the XV interlock valve. Installation, fixation and waterproofing 6. Check the connection and waterproofing of the XV interlock valve position feedback switch and the valve stem 14. Self-operated regulating valve 1. Check whether the self-operated regulating valve is intact 2. Check whether there are leaks in the pressure line pipeline of the self-operated regulating valve and the joints Whether it is fastened well 3. Check whether there is leakage at the flange and packing of the self-operated regulating valve 4. Check whether the self-operated regulating valve has any hazards such as vibration Waterproof condition of the level gauge and the indicator next to the tank 3. Check whether the radar level gauge has leaks 4. Check whether the measured value of the radar level gauge and the indicator next to the tank is within the normal range, whether there is an alarm message, etc. 16. Servo liquid level gauge 1. Check the servo liquid level gauge and the indicator next to the tank Whether the indicator is intact 2. Check the waterproof condition of the servo liquid level gauge and the indicator next to the tank 3. Check whether the servo liquid level gauge has leaks 4. Check whether the measurement value of the servo liquid level gauge and the indicator next to the tank is within the normal range, whether there is an alarm message, etc. 17. Combustible gas/ Toxic gas detection transmitter 1. Check whether the value indicated by the combustible gas/toxic gas detector on the DCS operating station is abnormal. 2. Check whether the combustible gas/toxic gas detection transmitter is intact. 3. Check the waterproof condition of the combustible gas/toxic gas detection transmitter and whether the rainproof cover of the probe is intact and in use. 4. Check whether the installation height of the combustible gas/toxic gas detection transmitter probe meets the requirements. 5. Check the combustible gas/toxic gas detection transmitter. Check whether the display value of the transmitter is normal, whether there is an alarm message, etc. 18. Online analysis instrument 1. Check whether the online analysis instrument is intact 2. Check the waterproof condition of the online analysis instrument 3. Check whether there are leaks in the sample gas pipeline, calibration gas pipeline, backflush gas pipeline, etc. of the online analysis instrument 4. Check whether the sample gas flow rate, pressure and other parameters of the online analysis instrument meet the requirements 5. Check the insulation and heat mixing of the sampling pipeline/pretreatment unit of the online analysis instrument (if any) 6. Check whether the value indicated by the online analyzer is within the normal range, whether there is an alarm message, etc. 7. Check whether the standard sample gas and standard solution of the online analysis instrument are in normal supply status (if any). 19. RTU 1. Check whether the inlet/outlet of the RTU cabinet is well sealed. 2. Check whether the RTU system is working normally, whether there is an alarm message, etc. 3. Check whether there are any problems with the RTU cabinet's weatherproofing, high temperature protection, sun protection, etc. 20. Control room/ Equipment in the cabinet room (1), DC regulated power supply 1. Check whether the status indicator light of the DC regulated power supply is normal 2. Check whether the fan operation of the DC regulated power supply is normal (if any) (2) Power supply switch 1. Check whether the status of the switch and circuit breaker in the cabinet is normal 2. Check whether the status indicator light of the terminal power supply switch is normal (3) Isolated safety barrier/ MTA board 1. Check whether the status indicator light of the isolated safety barrier is normal. 2. Check whether the dual power supply indicator light on the isolated safety barrier MTA board is normal (4). BN3500 series shaft system monitoring instrument 1. Check whether the status indicator light of each channel board is normal. For example, the "OK" light of each channel should be on (5). Cabinet/ Operation station 1. Check whether the filter element (cloth) of the cabinet/operation station needs to be cleaned. 2. Check whether the fan of the cabinet/operation station is running normally. 3. Check whether the wiring trough and cover plate in the cabinet/operation station are intact. 4. Check whether there are any debris in the cabinet/operation station and whether the hygienic condition is clean. 5. Check the status of each channel of the card terminal board in the cabinet. Whether the indicator light is normal 6. Check whether the working status indication of DCS, SIS, ITCC, PLC and other system cards is normal (6), others 1. Check the sticky mouse board between the cabinets 2. Check the operation of the air conditioner in the on-site cabinet room (including working mode, set temperature, actual temperature, set humidity, actual humidity, alarm information, etc.) 3. Check whether the on-site cabinet room is clean and tidy. 21. On-site junction box 1. Check whether the junction box is intact and whether it has clear serial numbers. 2. Check the waterproof condition of the junction box (such as whether the box cover fixing screws are complete and whether they have been tightened, etc.) 3. Check whether the remaining inlets/outlets of the junction box have been sealed. 22. Isolation fluid/high-pressure oil filling system 1. Check whether the isolation fluid pump is working normally. 2. Check whether the isolation fluid storage tank level is normal. 4. Check whether the high-pressure oil injection pump is working normally. 5. Check whether the liquid level in the high-pressure oil injection system tank is normal. 6. Check whether the joints of the high-pressure oil injection pipeline are loose or leaking. * * * . Catalytic device main fan (three units) instrument system 1. Check whether the lubricating oil system pressure and lubricating oil temperature indications are normal. 2. Check whether the bearing tile temperature, shaft vibration, shaft displacement, hood speed, and main air flow indication are normal. 3. Check whether the hood cut-off butterfly valve, regulating butterfly valve, main fan anti-surge vent valve (whether the signal air pressure corresponds to the valve opening), and the stator blade actuator are working properly. 4. Check whether there are alarms in the hood cut-off butterfly valve and hood adjustment butterfly valve controller. 5. Check whether there are important parameter alarms in the alarm record of the CCS operating station. 6. Check whether there are any abnormalities in the trend of important unit parameters. 7. Check whether there are any leakage problems in the on-site instrument joints. * * * . Catalytic backup main fan instrument system 1. Check whether the pressure of the lubricating oil system and the lubricating oil temperature indication are normal. 2. Check whether the bearing tile temperature, shaft vibration, shaft displacement, and main air flow indication are normal. 3. Check the fan anti-surge valve (whether the signal air pressure corresponds to the valve opening) and whether the stator blade actuator is normal. 4. Check whether there are any important parameter alarms in the alarm record of the CCS operating station. 5. Check whether there are any abnormalities in the trend of important unit parameters. 6. Check whether there is any leakage in the on-site instrument joints. 25. Catalytic air compressor/coking air compressor/circulating hydrogen compressor/hydrogen booster instrument system 1. Check whether the lubricating oil system pressure and lubricating oil temperature indication are normal. 2. Check whether the bearing tile temperature, shaft vibration, shaft displacement, turbine speed indication and control are normal. 3. Check whether the compressor primary and secondary outlet and inlet flow rates, and inlet and outlet pressure indications are normal. 4. Check whether the compressor anti-surge valve control and action are normal (whether the signal air pressure and valve opening are consistent). 5. Check whether there are important parameter alarms in the alarm record of the CCS operating station. 6. Check whether there are any abnormalities in the trend of important unit parameters. 7. Check whether there is leakage in the on-site instrument joints. 26. Atmospheric and vacuum/hydrogen production/naphtha modification/hydrorefining/hydrogenation reciprocating compressor instrument system 1. Check whether the instrument measurement lead pipe joints on the inlet and outlet buffer tanks of the compressor at each stage are loose? Whether there are harmful threats such as vibration. 2. Check whether the indication values of the pressure transmitters on the inlet and outlet buffer tanks of the compressor at all levels are consistent with the pressure indication values at the same location. 3. Check whether the air connection of the compressor load adjustment solenoid valve is loose or leaking. 4. Check whether the liquid level measurement indication value of the liquid separation tank between machines is consistent with the indication value of the local instrument (glass plate, magnetic flap, etc.). 5. Check whether there are any important parameter alarms in the alarm record of the CCS/DCS operating station. 6. Check whether there are any abnormalities in the trend of important unit parameters. 7. Check whether there is leakage in the on-site instrument measurement lead joints. 27. Normal and vacuum/gas tank screw compressor instrument system 1. Check whether the instrument measurement lead pipe joints on the inlet and outlet buffer tanks of the compressor at all levels are loose? Whether there are vibration and other harmful threats. 2. Check whether the indication value of the pressure transmitter on the inlet and outlet pipelines of the compressor at all levels is consistent with the pressure indication value at the same location. 3. Check whether the liquid level measurement indication value of the liquid separator tank between machines is consistent with the indication value of the local instrument (glass plate, magnetic flap, etc.). 4. Check whether there are any important parameter alarms in the alarm record of the DCS operating station. 5. Check whether there are any abnormalities in the trend of important unit parameters. 6. Check whether there is any leakage in the on-site instrument joints. 28. Catalytic electro-hydraulic slide valve servo control system 1. Check whether the input signal and valve position signal on the local cabinet display of the electro-hydraulic slide valve servo control system (valve position travel indicator, amplifier travel indicator, DCS travel indicator), deviation signal, and system power supply indicator are normal. 2. Check whether each alarm indicator light on the display of the electro-hydraulic slide valve servo control system has an alarm indication. 3. Check whether the field instrument junction box and field instrument joints of the electro-hydraulic slide valve servo control system are sealed properly. 4. Check whether the protection measures of the slide valve signal cable and the anti-high-temperature baking measures are complete. 29. Automatic backwash filter control system for raw materials (diesel hydrogenation, hydrogenation treatment device) 1. Check whether the display of the local control cabinet display of the automatic backwash filter control system is normal, whether the front, rear, upper and lower doors of the local control cabinet are closed and sealed well, and whether the waterproof seal of the local display of the control cabinet is good. 2. Check whether the sealing and waterproofing of the intermediate junction box of the automatic backwash filter are good. 3. Check whether there are leaks in the air source and signal pipeline of each control ball valve of the automatic backwash filter.