1. Check whether the appearance of the field instrument is complete, whether the hygiene is clean, whether there is water and moisture in the surface of the instrument, and do waterproofing, anti-collision, and anti-mite protection.
2. Inspect the pipeline of the on-site measurement instrument every day for leakage and water leakage. Otherwise, check the instrument signal line and power line (distribution box) in a timely manner. The anticorrosion of the measurement pipeline needs to be in good condition.
3. All size valves related to the instrument (including the drain valve) must be frequently refueled (mechanical oil, butter, lead powder) to ensure that the instrument valve is flexible and easy to use.
4. The site should undergo regular differential pressure change and pressure change in order to prevent the measurement pipelines and valves from being blocked (the correct use of the balance valve and the two boilers when the liquid level difference indication is correct should not easily discharge the pollutants). Sewage needs to be recorded, so that it knows what to do (frequent blowdown or switching the valve is not conducive to the normal operation of the instrument).
5. Boiler drum pressure, main steam pressure, economizer outlet pressure, and high steam outlet pressure 4 pressure gauges need to be checked once every six months to the quality inspection bureau (pay attention to the identification record), other analog instruments also have to According to the situation, regular self-checking.
6, combined with the process of inspection every day to confirm the secondary display instrument is accurate and reliable, or in time check processing. The DCS host unit, the operating station microcomputer, and the instrument cabinet must wait for the opportunity to remove dust in a timely manner.
7, check the instrument control circuit or moving instrument wiring when you want to draw the actual wiring diagram, and then hands off stitches check (this must be noted), the program operation changes before the first backup. When instrument maintenance, on-site maintenance or troubleshooting, notify the main control personnel and make emergency measures. When dealing with interlocking circuits with special parking, be sure to take measures to ensure normal production. Cut off the parking chain and then deal with instrument failures. .
8, analysis of the table to be maintained every day (see the specific maintenance procedures).
9, when replacing the pressure gauge should pay attention to "the actual pressure of the process can not exceed 2/3 of the gauge range," in order to determine the installed pressure gauge range.
10. When replacing the thermocouple, pay attention to the positive and negative terminals of the thermocouple output signal (sometimes the thermocouple is wrong, need to confirm with a multimeter, and the positive terminal of the thermocouple output millivolt should be connected to the red line of the compensation wire).
11. Be careful when cutting two or more conductors. Cut them one by one to prevent electric shock or damage to the equipment.
12. Pay attention to the prohibition of live operation or plug-in and plug-in connectors when maintaining the instrument or maintaining the computer.
13. When dealing with the failure of measuring instruments in the field (especially steam and other high-temperature and high-pressure equipment), it is necessary to pay attention to shutting down and re-inspecting when a valve or process is decompressed and has maintenance conditions.
14, the instrument's spare parts, spare parts to make advance purchase plans, so as not to affect the instrument overhaul.
15, on-site measurement points, measuring instruments to indicate the measurement point and the instrument's tag name, line number, line number after the cable to be correct, clear and clear.
16, winter to make a good instrument antifreeze, insulation work.
17. On-site pressure changes and differential changes are checked once every six months in principle. When daily inspections are performed by instrumentation workers, the flow, level, temperature, and pressure measurement systems are judged according to the process conditions and on-site pressure gauges. Meters that are inaccurate or do not conform to the process logic are checked and verified in a timely manner.
The above is only a part of the instrument to maintain common sense, unfinished business, and it is necessary to constantly explore and accumulate experience in practical work.
2. Inspect the pipeline of the on-site measurement instrument every day for leakage and water leakage. Otherwise, check the instrument signal line and power line (distribution box) in a timely manner. The anticorrosion of the measurement pipeline needs to be in good condition.
3. All size valves related to the instrument (including the drain valve) must be frequently refueled (mechanical oil, butter, lead powder) to ensure that the instrument valve is flexible and easy to use.
4. The site should undergo regular differential pressure change and pressure change in order to prevent the measurement pipelines and valves from being blocked (the correct use of the balance valve and the two boilers when the liquid level difference indication is correct should not easily discharge the pollutants). Sewage needs to be recorded, so that it knows what to do (frequent blowdown or switching the valve is not conducive to the normal operation of the instrument).
5. Boiler drum pressure, main steam pressure, economizer outlet pressure, and high steam outlet pressure 4 pressure gauges need to be checked once every six months to the quality inspection bureau (pay attention to the identification record), other analog instruments also have to According to the situation, regular self-checking.
6, combined with the process of inspection every day to confirm the secondary display instrument is accurate and reliable, or in time check processing. The DCS host unit, the operating station microcomputer, and the instrument cabinet must wait for the opportunity to remove dust in a timely manner.
7, check the instrument control circuit or moving instrument wiring when you want to draw the actual wiring diagram, and then hands off stitches check (this must be noted), the program operation changes before the first backup. When instrument maintenance, on-site maintenance or troubleshooting, notify the main control personnel and make emergency measures. When dealing with interlocking circuits with special parking, be sure to take measures to ensure normal production. Cut off the parking chain and then deal with instrument failures. .
8, analysis of the table to be maintained every day (see the specific maintenance procedures).
9, when replacing the pressure gauge should pay attention to "the actual pressure of the process can not exceed 2/3 of the gauge range," in order to determine the installed pressure gauge range.
10. When replacing the thermocouple, pay attention to the positive and negative terminals of the thermocouple output signal (sometimes the thermocouple is wrong, need to confirm with a multimeter, and the positive terminal of the thermocouple output millivolt should be connected to the red line of the compensation wire).
11. Be careful when cutting two or more conductors. Cut them one by one to prevent electric shock or damage to the equipment.
12. Pay attention to the prohibition of live operation or plug-in and plug-in connectors when maintaining the instrument or maintaining the computer.
13. When dealing with the failure of measuring instruments in the field (especially steam and other high-temperature and high-pressure equipment), it is necessary to pay attention to shutting down and re-inspecting when a valve or process is decompressed and has maintenance conditions.
14, the instrument's spare parts, spare parts to make advance purchase plans, so as not to affect the instrument overhaul.
15, on-site measurement points, measuring instruments to indicate the measurement point and the instrument's tag name, line number, line number after the cable to be correct, clear and clear.
16, winter to make a good instrument antifreeze, insulation work.
17. On-site pressure changes and differential changes are checked once every six months in principle. When daily inspections are performed by instrumentation workers, the flow, level, temperature, and pressure measurement systems are judged according to the process conditions and on-site pressure gauges. Meters that are inaccurate or do not conform to the process logic are checked and verified in a timely manner.
The above is only a part of the instrument to maintain common sense, unfinished business, and it is necessary to constantly explore and accumulate experience in practical work.
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