PIONEER WATER TANKS ROOF SYSTEM

 

Pioneer Water Tanks has over 30-Years developing a roof structure that is not only efficient to install but stronger and adaptable for most applications.

 

The innovative truss foot connection allows a flush, strong bolted connection with the tank wall. This results in a direct load transfer from the roof structure to the tank wall, and then to the ground. All Pioneer Water Tanks roof structures utilize the strength of Square Hollow Sections (SHS), fully welded and post galvanized that will perform in all conditions.

 

Additionally, all dome roof structures are carefully engineered to achieve load paths of uniform capacity to maximize cost efficiency.

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ENGINEERED SHS ROOF STRUCTURE

The engineered Pioneer Water Tanks roof structure comprising of SHS tube members fabricated into welded roof trusses with truss feet enables secure alignment with the tank wall.

The SHS trusses are high strength and ductility, engineered to provide direct load paths that are incident to the roof into the tank wall. The Pioneer Water Tanks roof system is manufactured with ZINCALUME® steel.

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EXCLUSIVE PIONEER WATER TANKS HEAVY-DUTY ROOF SYSTEM

The heavy-duty roof options are designed per relevant clauses of AS1170.0, AS1170.1, and AS1170.2 to withstand minimum regional winds of up to 141 feet per second. The heavy-duty roof options embody the features of the industry-standard roof design, the heavy-duty roof option is capable of handling heavier loads arising from larger platforms and handrails.

The heavy-duty roof has been structurally designed to enable mounting of ancillary features such as a vent hatch on one side of the roof diametrically opposite the access hatch.

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HEAVY-DUTY CYCLONIC ROOF OPTIONS

The cyclonic roof designs are available for Cyclonic Regions C and D in accordance with the relevant clauses of AS1170.0, AS1170.1, and AS1170.2.

 

The cyclonic roof designs are for 213 feet per second, and or 269 feet. Engineering packages depend on the tank project, local authority requirements, and tank application.

 

The cyclonic roof options embody the features of the heavy-duty roof design with roof trusses of greater depth and closer spacing to withstand the higher wind velocities expected in cyclonic areas.

PIONEER WATER TANKS XLE SERIES SYSTEM

The 100,000-Gallon model of Pioneer Water Tank is a three stacked panel system with increased roof trussing and wall panel enforcement. Wall panel sheets are pre-curved for each tank size to achieve the required circumference. Tank walls are comprised of three stacked rings bolted together with reinforcement. An overflow outlet is placed in one upper wall panel to account for design seismic sloshing effects. The overflow outlet height varies by tank size.

 

The XLE 50/03 Pioneer Water Tank is designed in accordance with AS2304 “Water storage tanks for fire systems” which references AS1170-2 Structural design actions Part 2 – Wind actions. The wind design parameters are:

• Importance level 2 (Normal Structures)
• 25-year design life (200-year recurrence interval)
• Region B
• Terrain Category 2
• Structure height < 5 metres (16.4ft)
• Topographical and shielding factors = 1.0
• Basic regional wind velocity = 51.8ms-1 (115.9mph)
• Resulting design pressure = 1.21kPa (25.3psf)

DESIGN SEISMIC LOADS

 

This tank is designed to withstand an effective seismic acceleration coefficient of up to 0.7 (refer Tables 2 & 3) and the seismic loads developed as per AS2304 which has the same methodology as AWWA D 103-97 “Factory Coated Bolted Steel Tanks for Water Storage”. The attached calculation sheets are for a seismic acceleration coefficient of 0.7.

DESIGN ROOF LIVE OR SNOW LOADS

 

Pioneer Water Tanks XLE-S series tanks are designed to withstand a maximum uniformly distributed live load or snow load of 1.0kPa (20psf) or a concentrated load of 1.4kN (300lbs) with the addition of internal and external columns and diagonal truss bracing. Roof support structures (trusses) are designed to accommodate maintenance and construction footfalls in the vicinity of the roof trusses. Roof activity shall be limited to installation and/or maintenance purposes. Roof structures shall not be altered or re-roofed without professional engineering
advice.

SITE / FOUNDATION REQUIREMENTS

 

(1) Recommended concrete compressive strength is 17MPa (2,500psi).

(2) Minimum allowable bearing capacity is 72kPa (1,500psf).

(3) The foundation must be embedded a minimum 300mm (12″) below existing grade to bear upon undisturbed native soils. If topsoil, organic materials, or uncontrolled fill soils are encountered, then the footing trench shall be over-excavated to remove those materials until undisturbed native soils are encountered. The trench can then be backfilled with concrete or engineered structural fill.

(4) Should there be any doubt about the stability or strength of the bearing soils, or if corrosive soil conditions are suspected, site-specific professional engineering advice should be sought.
(5) Refer to Drawing “XL50-RB-23-001” for additional requirements for the XLE-S 50/03 snow load tank.

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