Composite Elevated Storage Tank

DEFINITION: An elevated welded carbon-steel water storage tank supported by a large diameter steel-reinforced concrete support tower that extends vertically from the steel-reinforced concrete foundation as a circular concrete support structure/wall and has special horizontal and vertical rustication patterns formed into the exterior of the tower.

POSITIVE USES (when it's best)

Most modern style, some believe the most aesthetically pleasing, and others feel the securest with least liability

Areas where future repainting is either limited or more frequent (tight sights or salty environment)
The most common & typically most economical style in capacities greater than 1,000,000 gallons

HIGHLIGHTS & ADVANTAGES (over other styles)

The Composite Elevated Tank is attractive, low maintenance and durable structure combining efficient use of reinforced concrete for the support pedestal and welded steel for a watertight storage tank
Cost efficiency is gained by utilizing the valuable strength characteristics of each material; the tensile strength of steel for the water containment vessel and the compressive strength of concrete as the support column for the tank
No coating system required for the concrete shaft and thus less long-term maintenance (reduced surface area for painting)
Interior ladders and piping protects against weather and vandalism and easily allows for pipe insulation
Two styles of typical roofs: Conical or Dome
Architectural Rustications highlight the concrete column. These rustications are placed vertically and horizontally at the edge of concrete forms to blend concrete appearance and hide construction joints

SPECIAL FEATURES (bonus part of the asset)

Unauthorized access to the tank contents and vandal's graffiti are eliminated by pad-locked doors plus anti-graffiti coatings available; generally used for the first 20 feet of concrete shaft.
The shaft can be furnished with a 10' or 12' wide (depending on column diameter and the owner's needs) overhead door for easy access making it possible for the base area of the shaft to have ample storage for valve assemblies, pumps, and equipment or multi-purpose uses such as office space, file storage, and possibly multiple floors with windows.
Reinforced concrete pedestal support shaft offers ‘Severe Weather' protection for nearby employees, personnel, or neighbors as well as an uninterrupted ground silhouette (shadow on the ground).

STANDARD SIZES (others available but may be at a premium)

Reference the table 500,000 to 3,000,000

STANDARD ACCESSORIES

American Water Works Association (AWWA D107 & D102)

Steel frost-proof pressure/vacuum relief vent designed for maximum protection
(1) 24" diameter roof hatch with hinged cover and hasp
(1) 24" diameter roof hatch bolted for attachment of exhaust fan
(1) 24" diameter access tube roof hatch
(1) 24" diameter tank floor manhole
(1) 24" x 36" removable access hatch at top of supporting shaft
(1) 18" x 24" diameter manhole in a base of the access tube
(1) 24" diameter painter hatch at top of the composite shaft
Purchaser specified inlet/outlet piping with the expansion joint
Shaft-supported stainless steel overflow pipe to grade level with concrete splash pad
All ladders, walkways, handrails, and attachments inside the shaft are galvanized
Rest seats at desired intervals
Supporting shaft and access tube ladders with OSHA compliant safety climb devices
Upper shaft walkway with OSHA compliant handrail
Grounding for minimizing lightning damage
Personnel door in the base of supporting shaft
Metal drip pan drain under access tube
Gravel floor inside the shaft

STANDARD SIZES: CET

Capacity (US Gallons)	Head Range (Feet)	Tank Diameter (Feet)	Pedestal Diameter (Feet)
500,000	35'	50'	30'
500,000	30'	58'	30'
750,000	30'	74'	40'
750,000	35'	64'	36'
1,000,000	35'	74'	40'
1,000,000	40'	68'	36'
1,250,000	34'	86'	48'
1,500,000	39.5'	86'	48'
2,000,000	42'	98'	48'
2,500,000	45'	104'	56'
3,000,000	45'