Projects

andoo Mine Phase 2 Dewatering
Hotham Valley Railway Bridge Re-Construction

Hotham Valley Railway Bridge Re-Construction

Hotham Valley Railway
Hotham Valley Railway Bridge Re-Construction   Design and Fabrication of Steelwork for 6 new rail bridges to replace the wooden structures that were completely destroyed by bushfires during 2006/2007   Due to a series of major bush fires in late 2006 and early 2007, all of the 6 wooden trestle bridges on the Hotham Valley Tourist Railway’s line from Alumina Junction to Etmilyn, were totally destroyed. Watercon was contracted to assist with the design and then fabricate 6 new steel bridges. This included consultation and detail design to ensure the new bridges complied with WA Government Railways Commission design standards, as well as those of the Office of Rail Safety. Design reviews were carried by a certified civil engineer (ex WAGR civil engineer), who commented on the novel design, which are an all bolted construction based on WAGR designs for 20 BSU bridges. The all bolted design allowed for efficient fabrication, as well as ease of erection. This allowed the sections to be easily transported to the sites, most of which have limited access, using an 8t truck and erected using a 10t articulated crane. The last bridge was completed during December 2008 Visit the HVR website for more information
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Two Peoples Bay WTP Stage 3 Upgrade

Two Peoples Bay WTP Stage 3 Upgrade

Water Corporation of Western Australia
Two Peoples Bay WTP Stage 3 Upgrade   Construction of new chlorination and fluoridation facilities and other works at a water treatment plant 30km east of Albany WA   Stage 3 involved the upgrade of the chlorination of Two Peoples Bay WTP Stage 3 Upgrade,  fluoride dosing and PLC and SCADA systems at the Two Peoples Bay WTP. The existing gas chlorination facilities were beyond their economic life, and the storage facilities did not meet the current standards. A new storage system based around 4x 68kg cylinders replaced the 2 x 1t drum installation, with new vacuum regulators, chlorinator, pipework, instrumentation and local OIP. The fluosilicic acid (FSA) storage and dosing system was replaced with a sodium fluoride system (NaF) using a new batching and dosing plant using dissolvable bags made from food grade PVA, which had been trialled by the Water Corporation. This eliminated the risk of NaF dust exposure to the operators. Decommissioning of the FSA tank and dosing equipment required special attention due to the very high hazards presented by FSA. Following a lengthy and detailed risk assessment and planning stage, the bulk acid was transferred to another treatment facility. The unrecoverable acid was diluted and tankered for disposal. The pipework was carefully flushed with lime water to neutralize and precipitate the fluorides. The sludge was then removed for disposal. This work was completed smoothly in accordance with the detailed safe working procedure (SWP) without incident. The area was then prepared for the new equipment. New electrical controls were provided for the clearwater pumps, new level transmitters were supplied for the two weirs and new data radios for the weirs and summit tanks, and the site main PLC was upgraded to handle the additional I/O.
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