SFDesign were engaged by a Perth fabrication company to complete the engineering certification, design and detail drafting of a 38,000 litre rectangular bolted fire water tank to replace an existing fibre glass tank at the St. John of God hospital in Wembley.
SFDesign conducted a site visit to obtain dimensional information of the site layout, existing tank, and the necessary nozzle locations. With limited access via a laneway and various adjacent buildings the design required all fabricated components to be sized such that they could be locally transported to site and easily assembled without affecting the integrity of the tank design.
Tank design compliance to:
- AS2304 – Water Storage tanks for fire protection systems.
- AS3990 – Mechanical Equipment – Steelwork
- AS4140 – Structural Steel
Maintenance access platform and ladder designed in compliance to:
- AS1657 – Fixed platforms, walkways, stairways and ladders.
- 38,000 litre working volume split across two compartments allowing one compartment to be drained for maintenance whilst the other remains operational.
- Each tank compartment included an overflow, inlet, outlet, sludge drain nozzle, roof access hatch with internal ladder, shell access hatch, vent, visual level gauge, and internal float switch.
- Designed to fit within a constrained space of 4.2m x 3.2m x 4.2m (LxWxH) maintaining the existing nozzle layout.
- Folded steel tank panels with externally bolted flanges for ease of installation.
- A fast set, sikalastic polyuria lining was specified to be sprayed on the interior tank shell to ensure a water tight seal was obtained over the service life of the tank.
- All tank components shop fabricated and surface treated to minimise site installation time limiting the out of service period of the existing fire protection system.
- All fabricated components sized such that they could be locally transported.