Control requirements for inspection instruments

Thread Content

XVIII. Online analyzers
1. Check whether the online analyzers are in good condition.
2. Check the waterproofing of the online analyzers.
3. Check for any leaks in the sample gas lines, calibration gas lines, and purge gas lines of the online analyzers.
4. Verify that parameters such as sample gas flow rate and pressure meet the required specifications.
5. Check whether the insulation and heating systems of the sampling lines/pre-treatment units of the online analyzers are functioning properly (if applicable).
6. Confirm that the readings displayed by the online analyzers fall within the normal range and that there are no alarm messages.
7. Ensure that standard calibration gases and solutions for the online analyzers are being supplied normally (if applicable).

XIX. RTU
1. Verify that all entry/exit ports on the RTU cabinet are properly sealed.
2. Check whether the RTU system is operating normally and whether there are any alarm messages.
3. Inspect the RTU cabinet for any issues related to protection against weather, high temperatures, or sunlight.

XX. Equipment in control rooms/cabinets
(A) DC regulated power supplies
1. Check whether the status indicator lights on the DC regulated power supplies are functioning normally.
2. Verify whether the fans on the DC regulated power supplies operate normally (if present).

(B) Power switches
1. Check whether switches and circuit breakers inside the cabinets are in proper working condition.
2. Confirm that the status indicator lights on terminal-type power switches are functioning normally.

(C) Isolated safety barriers/MTA boards
1. Check whether the status indicator lights on isolated safety barriers are functioning normally.
2. Verify whether the dual-power supply indicator lights on the MTA boards of isolated safety barriers are operating correctly.

(D) BN3500 series shaft monitoring instruments
1. Check whether the status indicator lights on each channel board are functioning normally; all “OK” indicators should be lit.

(E) Cabinets/control consoles
1. Determine whether the filter elements/filters in the cabinets/control consoles need cleaning.
2. Verify whether the fans in the cabinets/control consoles are operating normally.
3. Check whether wiring ducts and covers inside the cabinets/control consoles are intact.
4. Ensure there are no foreign objects inside the cabinets/control consoles and that they remain clean.
5. Confirm that the status indicator lights on each channel of terminal boards inside the cabinets are functioning normally.
6. Verify that the operational status indicators on DCS, SIS, ITCC, PLC, and other system cards are working properly.

(F) Miscellaneous
1. Inspect mouse traps installed in the cabinet rooms.
2. Check the operation of air conditioners in on-site cabinet rooms (including operating mode, set temperature, actual temperature, set humidity, actual humidity, and alarm messages).
3. Ensure that on-site cabinet rooms are kept clean and tidy.

XXI. Field junction boxes
1. Check whether junction boxes are undamaged and clearly labeled with identification numbers.
2. Inspect the waterproofing of junction boxes (e.g., whether all fixing screws on the lids are present and tightened).
3. Verify that any remaining entry/exit ports on junction boxes have been properly sealed.

XXII. Isolation fluid/high-pressure oil injection systems
1. Check whether isolation fluid pumps are operating normally.
2. Verify whether the liquid level in isolation fluid storage tanks remains within normal limits.
4. Confirm that high-pressure oil injection pumps are functioning properly.
5. Ensure that the oil level in the high-pressure oil injection system’s tank stays within acceptable limits.
6. Inspect high-pressure oil injection pipelines for any loose connections or leaks.

*** Instrumentation systems for main air blowers in catalytic units (three-unit sets)
1. Check whether pressure and temperature indicators for the lubricating oil system are displaying correct values. 2. Check whether the bearing tile temperature, shaft vibration, shaft displacement, flue gas turbine speed, and main air flow indication are normal. 3. Check whether the smoke exhaust cut-off butterfly valve, adjustment butterfly valve, anti-surge vent valve of the main fan [to ensure that the signal air pressure corresponds to the valve opening], and the stator vane actuator are functioning properly. 4. Check whether there are any alarms on the smoke turbine shut-off butterfly valve and the controller of the smoke turbine regulating butterfly valve. 5. Check the CCS operation station alarm records for any alarms related to important parameters. 6. Check whether there are any abnormalities in the trends of key unit parameters. 7. Check for any leakage issues at the field instrument connections. ***Catalytic standby main fan instrument system 1: Check whether the lubricating oil system pressure and lubricating oil temperature indicators 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 [to ensure that the signal air pressure corresponds to the valve opening] and whether the stator actuator is functioning properly. 4. Check the CCS operation station alarm records for any alarms related to important parameters. 5. Check whether there are any abnormalities in the trends of key unit parameters. 6. Check for leaks at the connections of the instruments on site. 25. Instrumentation systems for catalytic compressors/coking compressors/cyclic hydrogen compressors/hydrogen pressure boosters: 1. Check whether the pressures and temperatures indicated by the lubricating oil system are normal. 2. Check whether the bearing tile temperature, shaft vibration, shaft displacement, and turbine speed indication and control are normal.
3. Check whether the flow rates at the inlet and outlet of the first and second stages of the compressor, as well as the inlet and outlet pressure indications, are normal. 4. Check whether the control and operation of the compressor anti-surge valve are normal [whether the signal air pressure corresponds to the valve opening]. 5. Check the CCS operation station alarm records for any alarms related to important parameters. 6. Check whether there are any abnormalities in the trends of key unit parameters. 7. Check whether there are any leaks at the connections of field instruments. 26. Atmospheric and vacuum distillation / hydrogen production / naphtha reforming / hydrorefining / hydrotreating reciprocating compressors – Instrumentation system: 1. Check whether the connection fittings of the instrument measurement lead pipes at the inlet and outlet buffer tanks of each stage of the compressor are loose Are there any hazards such as vibration? 2. Check whether the readings of the pressure transmitters on the inlet and outlet buffer tanks at each stage of the compressor match the pressure readings at those same locations. 3. Inspect the air connections of the load control solenoid valves for any looseness or leaks. 4. Verify that the liquid level readings from the liquid separation tank in the machine room correspond to the readings from the local instruments (glass gauges, magnetic level indicators, etc.). 5. Check the CCS/DCS operation station alarm records for any alarms related to important parameters. 6. Check whether there are any abnormalities in the trends of parameters of critical units. 7. Check for any leaks at the connections of the measurement wires of the on-site instruments. 27. Atmospheric and Vacuum / Gas Tank Screw Compressor Instrumentation System 1. Check whether the connector tubes for instrument measurement at the inlet and outlet buffer tanks of each stage of the compressor are loose 1. Are there any hazards such as vibration? 2. Check whether the readings of the pressure transmitters on the inlet and outlet pipelines at each stage of the compressor match the pressure readings at those same locations. 3. Verify that the liquid level readings from the liquid separation tank in the machine room correspond to the readings from the local instruments (glass gauges, magnetic level indicators, etc.). 4. Check the DCS operation station’s alarm records to see if there are any alarms related to important parameters. 5. Check whether there are any abnormalities in the trends of key unit parameters. 6. Check for leaks at the connections of the instruments on site. 28. Catalytic Electro-hydraulic Sliding Valve Servo Control System 1. Check whether the input signals and valve position signals on the display panel of the local cabinet of the electro-hydraulic sliding valve servo control system are normal, including (valve position travel indicator, amplifier travel indicator, DCS travel indicator); also check whether the deviation signal and system power supply indicator are normal. 2. Check the alarm indicator lights on the display of the electro-hydraulic slide valve servo control system to see if there are any alarms. 3. Check whether the wiring box of the on-site instruments and the connectors of the on-site instruments in the electro-hydraulic slide valve servo control system are properly sealed. 4. Check whether the protective measures for the slide valve signal cables, as well as the measures to prevent exposure to high temperatures, are adequate. Raw material automatic backwash filter control system (diesel hydrogenation, hydroprocessing units): 1. Check whether the display on the local control panel of the automatic backwash filter control system is functioning properly, and whether the doors at the front, back, top, and bottom of the control panel are properly sealed. Also, verify that the waterproof sealing of the local display is adequate. 2. Check whether the intermediate junction box of the automatic backwash filter is properly sealed and waterproof. 3. Check for any leaks in the air supply and signal pipelines connected to the various control ball valves of the automatic backwash filter