Recent press on quality assurance processes around the Te Mato Vai ring main construction has not captured the level of quality assurance processes which are being undertaken to ensure the quality of the ringmain pipeline.
The previous quality assurance process which was applied during the construction of the pipeline laid through the “Project City” project involved only testing for water pressure.
As Mr Latu Kupa, project manager Te Mato Vai clarified in his letter to the Editor of the Cook Islands News, the laying of the pipeline for Te Mato Vai has undertaken a more stringent two stage testing process. The first stage being water pressure testing, to test for leaks in the pipes, the second test being peels tests to check the adhesiveness of the electro fusion welds that join the separate lengths of pipe.
Of the twenty joints which have been tested since the commencement of the ring main, of these 19 have passed and the testing of one sample is currently being reviewed by CCECC and Kew.
The recently completed detailed design for Te Mato Vai has outlined that the maximum pressure existing anywhere along the pipeline will be 7 Bar. Testing is being undertaken to 9 Bar as per the New Zealand Standard 2566 (2008).
KEW is contracted to supervise the quality of the work being done and has engaged a quality assurance specialist. This quality assurance specialist is inspecting both the work and the subsequent two stage testing.
The arrangement between Kew and CCECC is working well and there is a high level of confidence amongst all stakeholders that the standard of work being undertaken will meet accepted New Zealand and Australian standards.