GB/T 39382-2020Thermoplastics piping systems for soil and waste discharge inside buildings. Test method for airtightness of joints (English PDF)

3.1 End Sealing Device

The joint assembly can be sealed and properly fixed; during the fixation, no axial force

shall be applied to the specimen. During the test, ensure that the sealing device or

specimen does not separate under the test pressure. The weight of the device shall

not affect the deflection angle of the specimen (see 5.8).

3.2 Atmospheric Pressure Source

It is connected to the end of at least one end sealing device through a shut-off valve.

During the test, the specified test pressure can be maintained, and the fluctuation

range is within +/- 10% (see Chapter 5).

3.3 Pressure Measuring Device

The test pressure can be measured, so as to ensure that the test pressure complies

with the specified requirements (see 3.2 and Chapter 5).

unsealed end of the fixed component. Then, use sealing devices to seal all other ends

of the pipe or joint; one of the sealing devices has a water outlet in the center and is

connected to a shut-off valve (see Figure 2).

In accordance with the manufacturer's requirements, assemble the joint assembly.

During the preparation of the specimen, within the deviation range allowed by the

standard, select the components with the smallest socket outer diameter and the

largest mouthing inner diameter. In accordance with the requirements of the relevant

standards, assemble them.

Measure and record the socket and mouthing dimensions of the selected components.

4.2 Number of Specimens

The number of specimens shall be specified in the relevant standards.

5.1 The test temperature is (23 +/- 5) °C; the test medium is water at room temperature.

During the test, there shall be no condensation on the surface of the specimen.

5.2 Horizontally fix the specimen on the test device (see Figure 1).

5.3 When conducting the test in accordance with the stipulations of 5.4 ~ 5.8, by

observing bubbles and water leakage generated by liquid soap (see 5.4), monitor and

record the leakage of the joint.

5.4 Apply liquid soap or a similar leakage indicator to the circumference of the joint

between the socket and the mouthing, then, wipe off the excess liquid.

5.5 Open the water drainage valve and close the air intake valve.

5.6 Open the water intake valve. Through the water flow at the water outlet of the pipe,

confirm that the water level in the specimen reaches half of the inner diameter of the

pipe. At that moment, firstly, close the water intake valve, then, close the water

drainage valve.

5.7 Open the air intake valve. At the test temperature specified in 5.1, use air as the

pressurizing medium to increase the internal pressure of the specimen to (0.01 +/- 0.001)

MPa.

5.8 Maintain the pressure for 5 min. Then, deflect the pipe fitting or joint installed at the

end of the socket of the fixed component respectively in the direction of 0°, 90°, 180°

and 270° (see Figure 2), until the maximum deflection angle specified by the

manufacturer is reached, maintain for 1 min at each position.

......