Summary of common problems when testing with a hydrostatic pressure tester

The hydrostatic pressure resistance tester is generally popular in actual use. It is an ideal instrument for factories, enterprises and product quality inspection agencies at all levels to test the waterproof performance of fabrics. It is also a product intended for universities, colleges and scientific research institutes. The main test instrument for development and research work.

Problems that may occur during the testing process of the hydrostatic pressure tester:

During the hydrostatic testing process, if the operation is incorrect, the experiment results may be affected. The following situations will affect the results of the experiment:

1. Before clamping the sample, make sure there is no air between the sample and water, then clamp the sample for experimental testing. If there is air between the sampleand water during the test, the water will not be able to fully contact the specified experimental area, and the water droplets will not appear in part of the sampling area, thereby affecting the experimental results .

2. During the test, try to ensure that the edge of the sample clamp is waterproof and tight. If the sample seeps or leaks at the edge of the clamp, water will escape from the edge of the clamp during testing, and the test pressure of the sample will increase unsteadily. This cannot guarantee the accuracy of the experimental results and will have an impact on the experimental results.

Determination of the test end point of the hydrostatic pressure tester:

According to the GB/T hydrostatic pressure test standard, record the static water when the third water droplet appears on the sample. Pressure value, the end point of thetest is the appearance of the third water droplet. If the test end point is incorrectly selected during testing, it will directly affect the reading of the experimental results, and ultimately incorrect experimental results will be obtained.

There are also special circumstances:

1. If the third water drop appears on the edge of the clamp and the hydrostatic pressure value of the third water drop is lower than For the low values ​​of other normal samples of the same sample, these data should be discarded and additional samples should be tested separately until normal experimental results are obtained. Under normal circumstances, the edges of the sample are likely to be damaged due to the pressure of the clamping device. When testing, water droplets may appear on the edge. In this case, the test results ofthe experiment must be carried out. Analyze whether the test value is lower than other normal samples and whether additional samples are needed.

2. In the annotations of the standard, it is stipulated that if the fabric ruptures, water jets erupt or the composite fabric swells with water during the experiment, record the pressure value at that time and explain the experimental phenomenon in the report. The occurrence of the above situations should be considered the end point of the experience.

Management of abnormal situations:

1. If the dispersion coefficient of hydrostatic pressure test results is high, if the average of the test results is qualified, but the individual test values ​​are not qualified, it is recommended to be judged to be consistent and l Individual unqualified test unit values ​​are noted in the report.

2. If the sample is already humide when it comes into contact with water before the experimental test, the test result is recorded as 0, and it is noted in the report that the sample is wet when it comes into contact with water.

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