GB/T 15227-2019Test methods for the air permeability, watertightness and wind load resistance of curtain walls (English PDF)

3.1 Standard condition

The test conditions where the air temperature is 293 K (20 °C), the atmospheric pressure is 101.3 kPa (760 mm Hg), the air density is 1.202 kg/m³.

3.2 Pressure difference

The absolute air pressure difference -- between the indoor and outdoor surfaces of the specimen.

Note: When the surface pressure on the outdoor is higher than the surface pressure on the indoor, the pressure difference is positive; otherwise, it is negative.

3.3 Air permeability performance

The ability of the specimen to prevent air leakage, when the openable part is closed.

3.4 Watertightness performance

When the openable part is in a closed state, the specimen's ability to prevent rainwater from leaking indoor, under the simultaneous action of wind and rain.

3.5 Wind load resistance performance

When the openable part is in a closed state, under the action of wind pressure, the deformation of the main stress-bearing components of the specimen does not exceed the allowable value and no structural damage or functional impairment occurs.

3.6 Grade testing

Testing, which is carried out to determine the performance level of the specimen.

3.7 Engineering testing

Testing, which is conducted to determine whether the specimen meets the performance requirements of the engineering design.

6.1 Composition

The testing device consists of a pressure box, an installation cross frame, a pressure supply device (including air supply equipment, pressure control device), a water spray device, a measurement device (including a differential pressure meter, air flow measurement device, water flow meter, displacement meter). The structure of the testing device is as shown in Figure 1.

6.2 Requirements

6.2.1 The opening size of the pressure box shall be able to meet the installation requirements of the specimen. The box shall be able to withstand the pressure difference, that may occur during the testing process.

6.2.6 The measuring device shall meet the following requirements: […]

6.3 Calibration

6.3.1 Please refer to Appendix A, for the calibration method of air flow measurement system.

6.3.2 Please refer to Appendix B, for the calibration method of the sprinkler system.

8.1 Preparation before testing

Before testing, the openable part of the specimen shall be opened and closed for no less than 5 times; it is finally closed tightly.

8.2 Testing procedures

See Figure 2, for the pressurization sequence for grade testing. When the project has requirements for air permeability performance testing pressure, the testing pressure can be pressurized, according to the pressure required by the engineering design. The testing and pressurizing sequence is as shown in Figure 3.

8.3 Preparation for pressurization

Before the positive pressure preparatory pressurization, open and close all openable parts of the specimen for 5 times; finally close them tightly.

8.4 Testing of air leakage

8.4.1 Determination of extraneous air leakage qf

8.4.1.1 Fully seal the openable gaps and inlaid gaps on the specimen OR seal the openable parts of the box.

8.4.2 Determination of the sum of extraneous air leakage and fixed part air leakage qfg

8.4.3 Determination of total volume of air leakage qz

Testing after removing the sealing measures added to the specimen. The testing procedure is the same as 8.4.1.2.

8.5 Processing of testing data

8.5.1 Processing of grade testing data

8.5.1.4 Under the action of 100 Pa pressure difference, the volume of air leakage qA' per unit area is calculated, according to formula (6).

8.5.2 Processing of engineering testing data

8.5.2.1 Calculate the overall air leakage volume (including the openable part) qs and the air leakage volume of the openable part of the specimen qk, under the standard state and the pressure difference required by the design, according to formulas (1) ~ (5).

8.5.2.2 Calculate the air leakage volume per unit area (including the openable part) of the specimen qA' and the air leakage volume per unit of openable joint length of the openable part ql', under the design pressure difference, according to formulas (6) and (7). Positive pressure and negative pressure are calculated separately.

9.1 Preparation before testing

After the specimen is installed, it shall be inspected. The testing can only be carried out, after it meets the design requirements. Before testing, the openable part of the specimen shall be opened and closed no less than 5 times. It is finally closed tightly.

9.2 Stable pressurization method

Pressurize according to the sequence in Table 1 and Figure 4; follow the steps below.

9.4 Evaluation of watertightness performance

The grade testing is based on the maximum pressure difference deltap, when no serious leakage occurs, in accordance with the provisions of GB/T 31433. […]