When a major WA mining operation required a new portable sewage storage solution for their site, the brief was clear…
The system needed to be robust, compliant, portable, and purpose-built for mining conditions.
This was not a first-time engagement. West Coast Poly had previously supplied both potable water and sewage storage tanks, with the mining company’s engineering and reliability teams keen to further refine the design based on operational experience. Working closely with their engineers, our design and production teams collaborated to review pressure management, venting, transport frame design, and long-term serviceability to deliver a refined, site-ready solution.
To maximise storage capacity while minimising footprint, the final design utilises a stacked tank configuration. A 14,000-litre LMDPE sewage storage tank is fully housed within a secondary polyethylene containment tank, creating a double-wall, fully bunded system that delivers strong environmental protection in a compact footprint suited to space-constrained areas.
The tank system was engineered specifically for sewage storage and includes a carefully considered suite of fittings designed for safety, reliability, and ease of operation. A roof-mounted suction outlet with an internal dropper, anti-vortex inhibitor and foot valve allows controlled emptying, while the infill line incorporates a non-return valve preventing backflow. Poly camlock connections are used throughout for fast, secure hose connections during servicing.
Venting was engineered to suit site operating procedures, with a gooseneck vent on the containment tank piped to near floor level and fitted with a knife valve that is opened during filling or emptying, along with an odour-eliminating vent with media cartridge to manage emissions and improve the surrounding work environment.
Operational safety is supported with mechanical level gauges on both tanks, plus independent 9V high-level and bund alarms.
The complete assembly is mounted on a heavy-duty steel platform with fork pockets, certified lifting points, and a full external protection frame, allowing safe transport and relocation as site requirements change.
Before dispatch, the tank system underwent an eight-hour hydrostatic test, with all lifting points load-certified to 130%, providing confidence in safety and compliance.
This project highlights the value of close collaboration between West Coast Poly and our mining clients, delivering practical, fit-for-purpose storage solutions engineered for real-world mining environments.
