Pressure test method of plastic pipe

The pressure test of the plastic pipe is important after the installation of the pipes in the field. The procedure for field pressure testing of the plastic pipeline has a different interpretation on how testing should be done.

It is important to use an accurate corrugated pipe extrusion machine to carry out the testing process. Also, you should know how to use the pressure test method to test the pipes to determine the integrity of the pipe joints that have been completed on-site.

Recent plastic pipes are manufactured using a controlled condition and testing system such as hydrostatic pressure testing of the pipe and joints to ensure minimum performance requirements during installation on site.

Things To Note Before Pressure Test

The three most commonly misinterpreted test parameters are duration, pressure, and length. It is important to note that before testing a plastic pipe, the condition of test equipment such as hoses, end caps, and pressure testing machine should be properly checked.

If there is any fault in the machine, there will be equipment leaks that will affect the result of the test. Inaccurate pressure gauges will affect the result of the test. This may lead to over-pressurization and damage to pipelines.

There should be enough water on-site before the commencement of the test because pipes require large volumes of water for the conduction of the pressure test. Besides, end caps should be able to withstand high forces without breaking down.

Requirement For Describing The Pressure Test

The main essence of performing the Pressure test is to determine the state of the pipe and ensure that it does not leak. Test pressure is conducted above the working pressure of the plastic pipe to allow the pipe to function under that pressure.

The pipes are also checked for possible leaks. The following requirements are considered:

1. The test pressure should be one and a half (1.5) times the functional pressure of the pipe with a maximum of 10 bar.

2. The test pressure should be in the range of 1.25 times and 1.5 times the working pressure at any point in the pipe.

Test Technique

1.Ensure that air is not trapped during the filling process. Try as much as possible to remove air before commencing the pressure testing.

2. Consider the position of the pressure gauge when determining the test pressure. This will help you avoid errors in reading and calculation.

3. Check the thrust blocks and the stop ends after slowly pressurizing the test section. Terminate the test immediately for repairs if you detect movement.

4. Check the joints for leaks when the pipelines reach test pressure.

5. In case of leaks, the pipeline should be depressurized for repairs before Pressure testing is carry-out again.

6. If there are no leaks, close the isolation valve that is between the pipes and the test equipment. Restore the pressure test after one hour and measure the amount of water required to do so in litres. 

Test Duration

The duration for pressure test should be 3hrs for pipes of a nominal diameter of 400mm and above, and less than 3hrs for pipe for pipes below the diameter of 400mm.

Recommended machine

The corrugated pipe machine line pipe is cheap and at the best price compared to the price in the market with effective service delivery. Xinrongplas.com offers varieties of quality testing machines for plastic pipe/PVC pipe testing at an affordable price.

Summary

The pressure test method of plastic pipe is very important to determine the integrity of the pipe joints. It is also a way to ensure that the pipe does not leak. It is advisable to use a quality machine that will give an appropriate result.

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