How to install a geosynthetics permeability coefficient tester? -Huaqiang Electronic Network

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How to install a geosynthetics permeability coefficient tester?

Installation and operation of the geosynthetics permeability coefficient tester:

1. Power on the device and press the pressure setting button to begin configuration.

Use the “Add” and “Subtract” keys to adjust the pressure value. Once the desired pressure is set, press “Enter” to save the settings. After adjusting the lower limit, press “Enter” again to exit. Then, proceed to set the time, adjust the time using the same keys, and calibrate the zero point before starting the test.

2. Open the water injection cover and fill the tank with distilled water until it's completely full. Start the pressurization process and open the pressure regulating valve so that water flows into the high-pressure chamber until it just overflows.

3. Place the sample on the mesh in the water collector, making sure there are no wrinkles or air bubbles. Carefully smooth out any excess water and secure the sample under the porous plate. Ensure the sample is evenly clamped without any gaps.

Note: For samples made from textile and membrane materials, ensure the membrane side faces the water surface. If the sample has textile on both sides with a membrane in the middle, clamp it on the water-facing side. Gently peel off part of the textile if needed, and apply an adhesive like glass glue to prevent leakage at the gripping area.

4. Raise the water pressure in the clamp to 0.1MPa. If you have an estimated range of hydrostatic pressure resistance, you can directly start the test at the lower end of the range. Maintain this pressure for at least 1 hour and observe whether water seeps through the perforated plate.

If no seepage occurs, gradually increase the pressure by 0.1MPa increments, keeping each level for at least 1 hour. If seepage is detected, the previous pressure level is considered the hydrostatic pressure resistance value of the sample, accurate to 0.1MPa.

5. According to GB/T 19979.2, the water seepage flow rate is used to determine if the sample is leaking. A very low flow rate indicates no seepage, while a sudden increase suggests damage or holes in the sample, which means the test should be stopped.

Note: If a droplet appears in the hole of the perforated plate, wipe it off. If no water reappears, it may be due to edge overflow, and the test can continue. If water continues to seep after wiping, the test should be terminated. If the goal is simply to check if the sample meets a specific hydrostatic pressure, apply that pressure and keep it for at least 1 hour. If no seepage occurs, the sample is considered acceptable.

6. If there is a significant difference between the measured values (e.g., more than 50% difference between two values), additional tests should be conducted. The lowest value among the three measurements is typically taken as the hydrostatic pressure resistance value. If one value is significantly lower than the others (by more than 50%), it should be excluded from the final calculation.

7. Finally, calculate the test results based on the relevant standards.

Important: After completing the test, open the drain valve of the high-pressure chamber. Clean the instrument, dry the test chamber, high-pressure chassis, and perforated plate, then apply anti-rust grease. If the equipment will not be used for a long time, open the drain valve located at the lower right corner of the main unit to fully drain the system and prevent frost damage.