Standard Sizes: LEG
Capacity
(US Gallons)
Head Range
(Feet)
Tank Diameter
(Feet)
Columns
50,000
17'3"
24'
4
75,000
19'3"
28'
4
100,000
22'
30'
4
125,000
24'1"
32'
4
150,000
28'3"
32'
4
200,000
28'3"
36'
4
250,000
25'6"
43'
5
300,000
30'
43'
5
400,000
30'
50'
6
500,000
37'
50'
6
500.000
30'
56'
6
600,000
36'
56'
6
750,000
38'9"
60'
8
750,000
33'10"
65'
8
1,000,000
38'9"
70'
8
1,000,000
33'
77'
9
1,500,000
35'
91'
12
2,000,000
34'9"
105'
14
Special Features
- Many believe this style provides the easiest additional future antennae, because of its external balcony.
- In locations where there is an increased risk of seismic events or high winds, additional design requirements can be most cost-effectively met utilizing the Multi-Column tank style.
- Caldwell Tanks has constructed many special capacity tanks and numerous unique design Multi-Column tanks for product display; such as Walt Disney's "Mickey Mouse Tank" in Orlando, Florida, Brook's Catsup Bottle in Collinsville, Illinois, Brown-Forman's Bourbon Bottle in Louisville, Kentucky, and the Sagamore Spirit Water Tower in Baltimore, Maryland.
When It's Best
- Most economical style, in terms of initial cost in small and medium capacities
- To gain additional storage capacity in the water system (especially for fire protection)
- To gain additional pressure in the water system (especially for power outages)
Highlights & Advantages
- Traditional elevated storage tank design; (Caldwell has been building this style since 1887. In the beginning, they were wooden; then, riveted steel; then, welded steel with the last wooden tank constructed in 1986)
- Caldwell's Multi-Column Tank is the most economical means to provide elevated water storage capacity in sizes 1,000,000 gallons and smaller in terms of initial capital cost
- Most efficient use of steel in the elevated tanks category
- Normally the center column is a 'wet riser;’ meaning that it is flooded with water from the ground up into the tank
- Standard designs include a balcony and handrail around the tank with access ladders on the tower column and tank; all of which provide useful exterior access
Standard Sizes
- Reference the table 50,000 to 2,000,000 gallons
American Water Works Association (AWWA D100 & D102)
Standard Accessories
- Steel frost-proof pressure/vacuum relief vent designed for maximum protection
- (1) roof hatch with hinged cover and hasp
- (1) roof hatch bolted for attachment of exhaust fan
- (1) riser manhole
- Purchaser-specified inlet/outlet connection to riser
- Balcony with OSHA compliant handrail
- Grounding for minimizing lightning damage
- Exterior tank and tower ladders with OSHA compliant safety climb devices
- Tower supported overflow pipe to grade level with concrete splash pad
Elective Accessories
- Tank drain for washouts
- Larger diameter manholes and hatches
- Shell manhole with ladder inside center wet riser
- Interior tank ladders (not recommended in colder climates)
- Complete internal seal welding
- Roof handrails
- Aluminum or custom roof vent
- Cellular antenna supports and provisions
- Painted logo, lettering, and custom graphics
- FAA lighting
- Locking ladder gates
- Ladder cages
- Dry riser with ladders and lighting in access tube and insulated tank piping
- Overflow flap valve
- High water elevation/pressure gauge
- One pressure testing port on each column leg for seal weld verification
- Solar powered or other type of mixing system
- Additional security or ornamental lighting
- Specialty trim or customized design
