Jandakot WA GWTP

 

The water scheme in Success supplying Jandakot GWTP had low pressure which was affecting the plant. The scheme currently supplies the plants service water, for use in chemical treatment and dosing. As a result, some issues existed at the site such as:

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• Poor service water pressure in general across the plant

• Safety showers did not meet Australian and Water Corporation standards for pressure and flow (210 kPa minimum supply pressure and 88.6 L/min flow for a minimum of 15 minutes)

• The polymer batching tank fill line had to be throttled (and hence filled very slowly), otherwise it dropped the pressures below acceptable levels for other assets.​

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PRG performed the following to address the above issues:

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1. Hot-taped a new connection into the clearwater pressure main, alongside the old offtake, to supply the service water lines with clearwater.

2. Installed a double block and bleed isolation on the new offtake, and on the cross connection to the existing scheme water supply.

3. Installed an RPZD & strainer on the new offtake. A downstream valve allows the strainer to be serviced without losing service water supply.

4. Added a valve to allow operators to isolate the potable supply to the Admin/Ops building

5. Added a valve to allow operators to isolate the sprinkler supply, along with a double check valve & strainer for backflow protection.

6. Installed a battery powered Siemens 8000 series magflow on the new offtake to measure clearwater volume usage. This was configured for local readings only (volume / consumption).