The specimen is securely clamped in the test chamber, and water is allowed to flow vertically through the geotextile under a controlled hydraulic head difference. The flow rate through the specimen is measured using the flow meters. By recording the water flow under specified test conditions, the vertical water permeability of the geotextile can be evaluated.

Geotextile Vertical Water Permeability Tester

Model:TDYTO20B

I. Product Introduction

This instrument is suitable for determining the water permeability of various types of geotextiles. It is a specialized testing device designed to measure the rate of water flow through geosynthetic materials and their composite products in the direction normal to the plane of the specimen. Under specified test conditions, it determines the volume of water flowing vertically through a single layer of geotextile.

Reference Standards: ISO 11058:2019, ASTM D4491/D4491M-22

II. Design Features

1. The entire instrument is constructed of imported 304 stainless steel, while the worktable is made of imported special aluminum alloy with a sandblasted and anodized surface treatment, providing excellent rust and corrosion resistance while keeping the overall unit relatively lightweight.

2. Water flows upward from beneath the specimen, eliminating a water-level drop and preventing the formation of air bubbles, thereby ensuring accurate test results.

3. Equipped with four flow meters for precise control of the hydraulic head difference.

4. The maximum flow rate can be controlled up to 5 L/min, enabling accurate measurement of the water permeability of single-layer geotextiles.

5. A water tank is installed at the top of the instrument to meet the testing requirements of specimens with relatively high water flow rates.

III. Main Technical Parameters

1. Maximum Head Difference: 250mmH2O

2. Measuring Cylinder: 1000ml (10ml accuracy)

3. Clamp Inner Diameter: Ф50+0.5mm

4. Power Supply: 220V

5. Maximum Sample Thickness: 20mm

6. Overall Dimensions: 820x730x1850mm

7. Time Counter: 0~99.9 seconds

8. Thermometer Range: 5-100℃

IV. Test Procedure

1. Prepare and condition the geotextile specimen according to the specified test requirements.

2. the specimen between the upper and lower clamps, ensuring that the specimen is flat and properly positioned.

3. Fill the water system and remove any air bubbles from the test circuit.

4. Adjust the water flow and hydraulic head difference to the required test conditions.

5. Allow water to flow vertically through the specimen and wait until the flow reaches a stable condition.

6. Record the water flow rate and corresponding test conditions.

7. Repeat the test as required and calculate the average result.

V. Key Advantages

Suitable for various types of geotextile materials.

Upward water flow helps minimize air bubble interference.

Four flow meters provide flexible flow measurement and control.

Maximum flow rate up to 5 L/min.

Suitable for specimens with relatively high permeability.

Durable 304 stainless steel construction with good corrosion resistance.

Compact and relatively lightweight design for convenient laboratory use.

Clear and straightforward operation for efficient testing.