Maintenance and upkeep procedures for quadruple automatic permeameter

1、 Daily maintenance

Cleaning after the experiment

Immediately drain the liquid from the permeation container and rinse with deionized water3time

Use a soft bristled brush to clean the pores of the permeable stone (metal tools are prohibited from scratching)

checkOIs the sealing ring deformed (compression deformation ≤)15%）

Pipeline system inspection

Test the sealing performance of inlet and outlet valves（1MPaWater pressure maintenance10No leakage in minutes)

Remove impurities from the pipeline filter（100Stainless steel filter screen cleaned weekly

sensor calibration

Zero point calibration of water level sensor (error under no-load state)≤±0.1mm）

Comparison of pressure sensors with standard pressure gauges (range)0-1MPa，≤0.5%FS）

2、 Zhou Maintenance

Penetration system verification

Standard sand sample（D10=0.3mm）Recheck the permeability coefficient (≤10%）

Check the synchronization of the quadruple system (flow deviation of each channel)≤5%）

Electrical system testing

Measure the grounding resistance（≤4Ω)

Check the waterproof performance of the data cable connector（IP54Level testing)

3、 Monthly maintenance

Key component maintenance

Replace the sealing gasket of the permeation container（FluororubberMandatory replacement cycle6Months)

Lubricating lifting mechanism (food grade white oil, oil injection amount)2ml/Month)

System performance testing

Conduct no-load flow test（0.1MPaThe flow rate of pure water should be10±0.5mL/min）

Verify the automatic collection system (sampling interval)1sTime data loss rate ≤0.1%）

4、 Annual maintenance

Comprehensive maintenance

Disassemble the pressure pump and replace the plunger seal (cumulative operation)2000After hours)

Calibrate all sensors (requiring a calibration certificate from the metrology institute)

software upgrade

Update the permeability coefficient calculation module (compliant with the latest)ASTM D2434Standard)

5、 Key Maintenance Parameter Table

component Maintain indicators standard value testing tool

Permeable stone permeability coefficient ≥1×10⁻³cm/s Comparison of standard sand samples

pressure sensor nonlinear ≤0.3%FS Pressure calibrator

6、 Common fault handling

Abnormal permeability coefficient

Phenomenon: Test values deviate from standard values30%above

Processing procedure:

Check the blockage of permeable stones (ultrasonic cleaning)30Minutes)

Review the saturation level of the sample（BValue ≥0.95）

Calibrate pressure control system

Pipeline bubbles

Phenomenon: Data fluctuations>5%

Processing procedure:

Activate the automatic exhaust program

Check the inclination of the pipeline（≥5° elevation angle)

Replace the deaerated water (dissolved oxygen)≤2mg/L）

Four out of sync

Phenomenon: Flow difference between channels>10%

Processing procedure:

Check the consistency of valve opening in each channel

Clean the internal flow channel of the splitter

Re calibrate the flow sensor

7、 Safety precautions

Chemical safety

Wear acid and alkali resistant gloves (such as butyl rubber) when in contact with chemical reagents

Waste liquid according toGB8978classified collection

Electrical safety

Disconnect before maintenance24VPower supply (capacitor discharge time ≥)1Minutes)

Operating Specifications

The maximum working pressure shall not exceed1.2Double rated value (marked with red warning line)

8、 Maintenance Record Form

date maintenance project executor Next maintenance date remark

2024-03-01 Permeable stone cleaning Engineer Wang 2024-04-01 ultrasound40kHz/30min

2024-03-15 Pressure sensor calibration Engineer Li 2024-06-15 +0.25%FS

Attachment: Tree diagram of maintenance cycle for permeameter

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Daily maintenance（15min）

∝ - Container Cleaning

▽ - Sensor Inspection

└ - Pipeline Drainage

Weekly maintenance（2h）

∝ - Standard Sample Verification

∝ - Electrical Testing

└ - Data Backup

Annual maintenance（8h）

▽ - Comprehensive dismantling and inspection

∝ - Metrological Calibration

└ - System Upgrade

The implementation of this regulation ensures that the equipment complies with the "Standard for Soil Test Methods"（GB/T50123-2019）Requirement: Maintain the accuracy of permeability coefficient testing within ±5%Extend the service life of the equipment to8Years or more. It is recommended to use the original factory maintenance kit (including specialized sealant, calibration tools, etc.) in conjunction.