Daily Maintenance Points for Metering Skid

Daily Maintenance Points for Metering Skid
The core of daily maintenance for a metering skid is to ensure sealing, cleanliness, instrument accuracy, safety and lubrication. Implement maintenance by daily/weekly/monthly/quarterly/yearly cycles to effectively guarantee metering accuracy and operational safety.
I. Daily Maintenance
Instrument and Data Inspection
Check that flow meters, pressure/temperature transmitters and differential pressure gauges display clearly, with stable data and normal uploading.
Record inlet and outlet pressure, temperature, instantaneous/total flow rate, compare with historical values, and troubleshoot immediately in case of abnormalities.
Leakage and Sealing Inspection
Conduct a comprehensive inspection of static sealing points such as flanges, valves, joints and welds to ensure no gas/liquid leakage.
Use leak detection fluid or detectors for inspection; shut down the unit immediately if leakage is found.
Filter and Differential Pressure
Check the filter differential pressure gauge to ensure it is within the normal range (usually ≤0.1MPa).
Excessively high differential pressure indicates clogging of the filter element, requiring timely blowdown or switching to the backup branch.
Appearance and Environment
Keep equipment, instruments and pipelines clean, free of oil stains, debris and accumulated water.
Check that the skid foundation, supports and guards are intact without looseness, deformation or corrosion.
Valves and Actuators
Check that manual/electric valves open and close flexibly without jamming or abnormal noise.
Ensure the battery power, limit switches and feedback signals of electric actuators are normal.
II. Weekly Maintenance
Operate all valves through a full stroke once to maintain flexibility and apply grease.
Inspect explosion-proof flexible hoses, cables and junction boxes, tighten loose connectors, and ensure explosion-proof sealing.
Blowdown: Drain accumulated liquid and impurities from filters, separators and low-point blowdown valves.
Check that safety accessories (safety valves, emergency shutdown valves, overpressure relief valves) have intact appearance and lead seals.
III. Monthly Maintenance
Filter and Filter Element
Switch to the backup branch, thoroughly blow down, clean or replace the filter element in service.
Inspect the inside of the filter separator to ensure no accumulated liquid or impurity buildup.
Fastening and Sealing
Fully tighten all flange bolts, joints and instrument interfaces to prevent loose leakage.
Check the sealing of transmitters and instrument boxes for waterproof, dustproof and moisture-proof performance.
Lubrication and Actuators
Apply specified lubricating oil (such as watch oil, glycerin) to valve screw rods, bearings and gearboxes of electric actuators.
Check the battery voltage of electric actuators and replace batteries in time when power is low.
Pressure Vessels and Accessories
Inspect the appearance of pressure vessels and tanks for no deformation, bulging or cracks.
Verify the indications of pressure gauges and level gauges to ensure accuracy.
IV. Quarterly Maintenance
Anticorrosion Treatment: Remove rust from the skid body, pipelines and supports, and touch up anticorrosive paint to prevent corrosion spread.
Pressure Regulating and Shutdown Valves: Inspect the sleeves, valve cores and diaphragms of pressure regulating valves for no wear or jamming; test that safety shutdown valves act sensitively and shut down reliably.
Filter Elements and Vulnerable Parts: Comprehensively inspect filter/separation elements, replace damaged or aged ones immediately; replace gaskets, O-rings and other vulnerable parts.
Automatic Control and Interlock: Test the alarm and interlock protection functions of flow, pressure and temperature to ensure normal triggering.
V. Annual Maintenance
Mandatory Verification: Entitle qualified institutions to conduct periodic verification on flow meters, pressure gauges, pressure/temperature transmitters and safety valves, and issue certificates.
Comprehensive Overhaul: Disassemble and inspect key valves, flow meters and pressure regulating devices, repair or replace worn parts.
System Testing: Conduct air tightness test and pressure test to verify the overall sealing and strength.
Document Filing: Organize records of annual maintenance, verification and fault handling, and establish equipment files.
VI. General Maintenance Guidelines (12 Principles)
Cleanliness: Equipment, instruments and pipelines are free of oil stains, impurities and accumulated water.
Lubrication: Lubricate moving parts regularly with qualified oil level and quality.
Fastening: Bolts and joints are free of looseness with reliable sealing.
Adjustment: Parameters of instruments, valves and actuators are accurate with proper action.
Anticorrosion: Remove rust and paint regularly to prevent corrosion by medium and environment.
Sealing: No leakage at static sealing points, and intact dynamic sealing parts.
VII. Safety Precautions
Cut off air supply/power supply, relieve pressure, replace and ventilate before maintenance, and apply for work permits.
Use explosion-proof tools in flammable and explosive medium environments, and strictly prohibit open flames.
In case of serious leakage, abnormal noise, overpressure, etc., conduct emergency shutdown immediately and report to higher authorities.