Whether it’s work we’ve completed or the work of another contractor, Aotea Welding pressure tests HDPE pipelines to verify the weld integrity before the pipe system is put into service. This ensures the pipeline can withstand operational pressures without leaks or failures and safeguards the system’s longevity and reliability.
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HDPE pipeline pressure testing usually involves one of two methods:
Hydrostatic testing is the more commonly employed method due to its safety and effectiveness.
Usually conducted prior to the contractor payment, a pressure testing certificate will be issued to verify the pipelines compliance to the project’s initial bid document. Our tests are all conducted in accordance with relevant New Zealand standards.
Following a pressure test, each client will also be provided with a full Pressure Test Inspection Report which includes detailed information to document the inspection process and results.
All new pipelines must be pressure tested before backfilling trenches. The testing process begins with thoroughly cleaning all pipes and connections and ensuring those connections, joints, and fittings are correctly installed. Once sealed, the system is filled with water or gas and pressurised to a predetermined level. This pressure will usually exceed the system’s normal operating pressure and is maintained for a specified period, during which the system is monitored for drops in pressure or visible leaks.
Key factors in successful HDPE pipe pressure testing include proper equipment, adherence to industry standards, and meticulous documentation. Standards such as ISO 4427 provide guidelines for testing procedures, ensuring accuracy and safety.
Regular pressure testing, combined with ongoing maintenance and inspections, helps ensure your HDPE pipe systems perform as expected, offering peace of mind and long-term efficiency in demanding environments.
Pressure testing may also be undertaken if there is any damage or suspected damage to a pipeline, e.g., after an incident involving a pipeline or following an earthquake or similar natural event.
Get in touchUsually pressure testing of an HDPE pipeline occurs before that pipeline is put into service and is carried out to ensure its integrity and safety. A pressure test will identify leaks, weaknesses, or defects and confirm that the pipeline can withstand its designed operating pressure and meet regulatory standards.
Pressure testing can also be carried out on existing pipelines as part of the regular maintenance or if it is suspected that there may be a leak or some other damage.
The time taken to test the pressure of a HDPE pipeline will depend on the its size and length, and the required testing standards. For a new pipeline, the process usually includes a period of stabilisation to allow the pipeline material to adjust to the landscape before the test is undertaken. The actual test can be anything between one and eight hours – as explained, this very much depends on the pipeline’s size.
Whatever the method used, there will be a considerable build up of pressure within the pipeline meaning proper safety precautions are paramount. At Aotea Welding, our key safety precautions include:
All our pressure testers are both fully qualified and experienced in the pressure testing methodology. This includes understanding and enacting all necessary health and safety procedures to ensure the safety of everyone involved.
