This version of Aquastop® has been designed to enable defective fire hydrants to be exchanged.
Fire hydrants are usually situated in the road surface and it is usually more cost effective to replace them than to attempt an in situ repair. Previous practice involved shutting down the main either by closing valves or using traditional line-stopping techniques. However, valves could often be some distance away so that supplies to customers would be interrupted. Both methods of shutting down and restoring the supply could disturb sediment in the main leading to complaints regarding water quality.
In the WASK Hydrant Wizard system the flow of water in the main is not affected. A simple plate valve is fitted to the ‘leg’ between the hydrant and the main through which a small hole is drilled under-pressure. A small stopping bag is inserted and inflated. Inflation is controlled by means of an Aquastop style pressurisation unit but, whereas the pressure for Aquastop is taken from a separate tapping in the main, the bag inflation pressure for the hydrant stop equipment is taken through the bag entry hole.
When the bag is fully inflated, the defective hydrant can be replaced. The supply to the new hydrant is restored by deflating and removing the bag. The access hole can then be plugged. At no time is the flow in the main affected.
The operating pressure is 6 Bar and a 3" diameter hydrant leg can be stopped.
Benefits of using Hydrant Wizard:
- Only the hydrant is isolated; the flow in the main is not interrupted.
- Supplies to customers and water quality are unaffected throughout the operation. Sediment in the main is not disturbed and flow is uninterrupted.
- Excavation is restricted to the area around the hydrant minimising the cost of labour and materials.
- The small diameter access hole does not compromise the integrity of the pipe. The only consumable is a small plate valve which remains on the hydrant leg.
- The equipment is compact and lightweight and can be used in confined areas.
- No independent power source is required.
| Part No. | DESCRIPTION | Unit Qty |
|---|---|---|
| EA0276 | PRESSURISATION UNIT | 1 |
| EA0277 | ASSY BAG HEAD | 1 |
| EA0278 | ASSY DRILL HEAD | 1 |
| EA0298 | PREPARATION TOOL | 1 |
| EA0193 | ASSY DEL HOSE 3/8 RED AQSP | 1 |
| EA0210 | ASSY DEL HOSE 3/8 BLU AQSP | 1 |
| JC0408 | KEY HEX 5 A/F T HANDLE | 1 |
| JC0633 | 19 A/F SQ RATCHET SPANNER | 1 |
| EA0197 | ASSY ADPT VENT BAG AQSP | 1 |
| EA0299 | ASSY PRESSURE TEST POINT | 1 |
| JC0635 | RATCHET 1/2" SQ DRIVE | 1 |
| JC0791 | SOCKET 19 A/F HEX EXTENDED | 1 |
| JC0790 | SPANNER OPEN ENDED 19 A/F | 1 |
| EA0300 | ASSY BOX HYDRANT WIZARD | 1 |
| JC0528 | 12 A/F HEX RATCHET SPANNER | 1 |