3.1.2 Storage Tanks – Technical Specification & Infrastructure Summary
This document outlines the full specifications and supporting infrastructure for the potable and emergency water storage system at Lake Bennett Estate. The tank farm includes a mix of steel and polyethylene tanks arranged for domestic supply, emergency reserves, and fire-fighting capacity.
System Summary
- Total Storage Capacity: ≈ 449,250 Litres
- Tank 1 (Primary Steel Tank): 309,250 L
- Tanks 2–5 (Poly, 30kL): 120,000 L
- Tanks 6–7 (Poly, 10kL): 20,000 L (Emergency reserves)
- Water Source: Bore feed
- Tank Locations: Refer to 8.1 Civil Drawings
- Distribution System: Gravity-fed manifold with isolation valves
- Monitoring: Mechanical and ultrasonic flow meters
- Control Points: Float valves, manual isolation taps, flush and air release valves
Tank Details
Tank 1 – Rhino RT-310 Steel Storage Tank
- Quantity: 1
- Manufacturer: Rhino Tuff Tanks (Kingspan Rhino Tanks)
- Model: RT-310
- Total Capacity: 309,253 L (Usable: ~309,250 L)
- Dimensions: Ø 11.65 m × H 2.9 m
- Construction: Corrugated galvanised steel with Polyethylene liner (Infinity Poly X)
- Certifications:
- AS/NZS 4020 – Potable Water
- AS/NZS 1170 – Structural
- AS/NZS 4600 – Steel Structures
- Warranty: 20-year pro-rata (tank & liner)
-
Ancillary Equipment:
- Bore-fed inlet (poly pipe) with isolation tap
- Internal float valve
- Mechanical level indicator
- Overflow safeguard pipe
- Manhole access
- Isolation valves at base
-
Primary Use: Potable water supply and fire-fighting storage
Manufacturer Resources: - Kingspan Product Page - Installation Manual - Product Brochure
Tanks 2–5 – Terracorp 30,000L Poly Tanks
- Quantity: 4
- Model (Approx): WT30
- Individual Capacity: ~30,000 L
- Total Group Capacity: ~120,000 L
- Dimensions (each): Ø 3450 mm × H 3390 mm
- Construction: UV-stabilised, food-grade polyethylene (ribbed)
- Warranty: Typically 10 years
-
Ancillary Equipment:
- Bore-fed inlets with isolation taps
- Internal float valves
- Top-mounted level indicators
- Overflow drains
- Manhole access
- Base manifold with individual tank isolation
-
Primary Use: Potable water buffer/storage
Manufacturer Resources: - Terracorp Tanks Overview - 30,000 L Tank - Installation Guide
Tanks 6 & 7 – Terracorp 10,000L Poly Tanks
- Quantity: 2
- Model (Approx): WT10
- Individual Capacity: ~10,000 L
- Total Group Capacity: ~20,000 L
- Dimensions (each): Ø 2400 mm × H 2220 mm
- Construction: UV-stabilised, food-grade polyethylene (ribbed)
- Warranty: Typically 10 years
-
Ancillary Equipment:
- Bore-fed via shared line
- Linked by small manifold
- Overflows & manhole access
- No float valves installed
-
Primary Use: Emergency and fire reserve
Manufacturer Resources: - 10,000 L Tank - Installation Guide
Piping and Control Infrastructure
Manifolds & Isolation
- Tanks 2–5 connected at the base via a shared poly manifold
- Each tank has a blue-handle isolation tap
- Master tap installed at the end of the line
Air Valve
- Installed on main gravity-fed line
- Equalises air pressure during tank isolation or line filling
Bore Inlet Isolation & Flush Valve
- Flush Valve: Installed on bore line, used biannually to clean the main supply line
- Isolation Valve: Full-bore manual tap to shut off bore feed during maintenance
Monitoring Systems
Mechanical Water Meter
- Located on main output line
- Tracks cumulative flow from all tanks
Ultrasonic Flow Meter
- Digital display unit for live flow rate monitoring
- Installed in line after mechanical meter
Safety Systems
- Overflow Pipes: Installed on all tanks to prevent structural overfilling
- Float Valves: Tanks 1–3 include bore shutoff floats
- Removable Ladder: Used for access to Tank 1, stored off-system when not in use
Version Control
| Version | Date | Description |
|---|---|---|
| 1.0 | 2025-09-10 | Initial Release |
Next Review Due: 2026-03-10