21/026 - 21/026 - Ballymore Eustace to Saggart Trunkmain Condition Assessments

Condition assessment surveys of existing trunkmains from Ballymore Eustace Water Treatment Plant (WTP) to Saggart to determine risk to supply for 830,000 customers in the GDA. Ballymore Eustace WTP is the largest WTP in Ireland. Treated water is conveyed from Ballymore Eustace to Saggart via two trunk mains, namely the Liffey Aqueduct and a 1,600mm pre-stressed concrete pipeline. The capacity of the pipeline and the aqueduct is approximately 310MLD with peak capacity of 329MLD. Condition assessment surveys are to be carried out on the full length of the prestressed concrete main (25km) and the steel sections of the aqueduct (9km). The surveys must include the use of in pipe, untethered survey technology as it will not be possible to take either main out of service for the duration of the surveys. The surveys on the pre stressed concrete pipeline will locate leak locations, identifying joint failure and the condition of the internal liner. The surveys will also identify individual wire break locations, pipe wall reduction and locations of sedimentation in the trunkmain. Pressure transient logging will also be required to develop a hydraulic pressure profile for the pre stressed concrete pipeline. The output report shall also provide an assessment on the service life of the mains, identify individual pipe sections in need of repair and any ongoing monitoring and maintenance required to extend the design life of main. Additional tethered cctv/acoustic surveys may also be required depending on conditions encountered.

Services

25/05/2021 12:00:00

76600000-9  Pipeline-inspection services
44161200-8  Water mains