John Holland Tunnelling engaged AWMA to assist with Melbourne Water’s high profile, Melbourne Main Sewer Replacement Project. Melbourne Water’s largest WLF penstock will be used to isolate the 1.8m diameter Melbourne Main Sewer.
AWMA were engaged to design, manufacture, install and test the 4m high structure. Despite the challenging site location and environment (14m below a Melbourne city freeway), the gate was tested in-situ under 10.9m head pressure with excellent results.
The 7.5m spindle leads up into an enclosed actuator pit. The gasless pit houses the headstock and actuator used to drive the gate. Melbourne Water have three control options for the isolation gate including manual operation from within the actuator pit, local control from street level above the pit and remotely via Melbourne Water’s SCADA system.
The infrastructure for these projects required significant engineering. AWMA supplied flow control gates, actuation systems and storage structures including a Round Bottom Penstock custom designed to seal against the benched sewer profile. AWMA’s unique capacity to achieve innovative designs using grade 2507 stainless steel resulted in custom manufactured products that exceeded all requirements.
Melbourne Water is replacing a section of the existing Melbourne Main Sewer. The new main sewer will travel approximately 2.3km from Docklands, crossing the Yarra River upstream of the Charles Grimes Bridge, and into Port Melbourne. The Melbourne Main Sewer Replacement Project is an important project that will deliver health and environmental benefits to meet the future growth of Melbourne.