Western Rising Main
PWS played a pivotal role in upgrading Launceston’s sewerage system to enhance water quality outcomes for the Tamar River. Collaborating with TasWater Capital Delivery Office (CDO), we constructed 1,175 meters of DN1000 PN16 SDR11 HDPE pipeline on reclaimed land. Our responsibilities included:
- Pipe management (unloading, storage, and transport on-site)
- Welding
- Excavations reaching up to 4.8 meters deep
- Laying and backfilling
- Supply and installation of scour, air, and isolation valves
- Site remediation
During construction, we managed Acid Sulfate Soils (ASS) by mixing lime through the excavated spoil and backfilling the trench in layers to neutralise the ASS, thereby reducing the potential for localised environmental impact.
The project presented unique challenges, including working within a narrow corridor that required precise handling of large pipes and machinery. We utilised our excavator with a vacuum suction attachment for handling large bore pipes and ensured safe working conditions through shoring in unstable ground conditions during valve assembly and other construction activities.
The site, a services corridor, required careful management to maintain the operation of existing DN1200 stormwater systems, open channel swales, high-voltage underground power lines, and communication lines. Our quality and permitting systems, along with meticulous site management, protected these services, which were frequently within the trench profile and required mechanical support to maintain their integrity.
Due to our expertise in high-pressure in-trench welding, PWS was further engaged by the CDO to construct the tie-ins with the DN1000 HDD sections.
