NFPA Member:
Our tanks are designed to meet National Fire Protection standards (NFPA-22) and NSF/ANSI.STD 61 for the potable water storage option. Our engineering team can provide certified tank and foundation design to meet specific applications and project requirements. The modular design of our water tank enables it to be packaged flat and allows for easy transportation to even difficult or remote areas.
Quality Service and Quality Products with the Best Pricing in the Industry
As communities, businesses and industries become increasingly accountable to meet LEED and other environmental requirements that require safe, design-proven storage, RainFlo is on the forefront with innovative answers. When considering the options in customized systems for water storage, facility designers and owners look for a long-term, structurally strong, watertight and cost effective solution. That is exactly what the RainFlo corrugated tank system is.
RainFlo steel water storage tanks use the latest technology and materials utilizing a bolted steel outer shell with a heavy duty liner. These tanks can be assembled at the project site by trained installation professionals or sold as product only, including a very detailed and easy to follow instruction manual.
Our RainFlo line of field-assembled corrugated steel water tanks are designed to be an aesthetically pleasing and cost effective water storage solution. These versatile tanks have been installed in several different countries in all types of climatic regions, including those that experience dry conditions, snow, earth quake and hurricane activity.
Our tanks are designed to meet National Fire Protection standards (NFPA-22) and NSF/ANSI.STD 61 for the potable water storage option. Our engineering team can provide certified tank and foundation design to meet specific applications and project requirements. The modular design of our water tank enables it to be packaged flat and allows for easy transportation to even difficult or remote areas.
CUSTOM TANK SIZES ARE AVAILABLE
Popular Tank Sizes and Packages:
| 6 |
1,500 |
0602 |
5'-11" |
7'-6" |
9'-3" |
|
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| 4,500 |
0606 |
5'-11" |
22'-3" |
23'-11" |
|
|
| 9 |
3,400 |
0902 |
8'-11" |
7'-6" |
10'-1" |
|
|
| 5,100 |
0903 |
8'-11" |
11'-3" |
13'-10" |
|
|
| 10,000 |
0906 |
8'-11" |
22'-3" |
24'-10" |
|
|
| 12 |
15,200 |
1205 |
11'-11" |
18'-6" |
22' |
|
|
| 15 |
9,500 |
1502 |
14'-11" |
7'-6" |
11'-7" |
|
|
| 23,500 |
1505 |
14'-11" |
18'-6" |
22'-7" |
|
|
| 28,515 |
1506 |
14'-11"
|
22'-3" |
26'-3" |
|
|
| 27 |
30,500 |
2702 |
26'-10" |
7'-6" |
15' |
|
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Click here for a list of all available tank sizes
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PRICES DO NOT INCLUDE FREIGHT
1 Approximate capacity. Usable capacity may vary ±10%. If an overfill-protection device such as a ball-float or flapper valve is installed in the tank, the actual tank capacity will likely be reduced.
2 Actual tank dimensions may vary due to fittings, accessories and slight differences in construction. Consult specification sheets for accurate dimensions for use on installation planning.
3Standard Package includes
- 3/4 Horsepower 4-stage stainless steel pump
- High Strength G115 Galvanized Steel Water Tank Shell
- Durable 30 Mil Potable PVC Liner
- Geo-textile Pre-liner
- Side Roof Access
- Roof Ladder (on tanks 12' diameter and larger)
- Top Roof Manway
- Inlet Leaf Filter Basket
- 6" Overflow Assembly
- 2" Bulkhead Fitting Assembly
- 2" Outlet Valve
- Seal Strip
- All Assembly Components
4Pro Package ($1,450 value) includes everything in the Standard Package
PLUS:
Package pricing is only available as shown. No substitutions or refunds allowed.
RainFlo CGS Corrugated Steel Rainwater Storage Tanks are designed to be constructed onsite in minimal time with very minimal site preparation required. Most CGS models can be installed on a 6'' minimum thickness sand or gravel foundation pad.
RainFlo corrugated steel water tanks are used in a variety of applications, such as:
- Potable Water Storage
- Fire Protection
- Irrigation
- Rainwater Harvesting
- Storm Water Retention
- Wastewater
- Mining
- Agriculture
- Industrial Processing
- Aquaculture
- Thermal Storage
- Many other bulk storage needs
These features make our water tanks an ideal choice for your water storage needs:
- High quality bolted steel outer shell
- Wide range of sizes / Custom sizes
- Resistant to extreme climates
- Meets a variety of design standards
- Experienced engineering team
- Modular designs / easy transportation
- Trained installation professionals
- The best pricing in the industry
Depending on the application, NFPA corrugated steel tanks typically include a number of heavy-duty fittings, steel flange kit (shown below), hydrant, roof vent, access hatch, wall ladder with OSHA safety cage (shown above), liquid level indicator and anti-vortex inlet.
Please contact us for application specific information.
Assembly Drawing of a Four Inch Fire Connection:
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 Optional Water Tank Accessories:
A goal at RainHarvest Systems has always been to meet the challenge of a constantly changing industry by meeting the functional requirements of system designers and owners. RainHarvest Systems meets that challenge with a wide and growing range of corrugated water tank accessories such as those listed on this page. 
- Inspection Hatches/Manways (Various sizes)
- Inlet and Outlet Flanges and Bulkheads
- Rainwater Pre-filtration Systems
- Potable Water Liners
- Ladders and Platforms
- Ground-level Side Access Ports
- OSHA Safety Cages
- Ladder Lock-off Panels
- Concrete Anchors
- Fireman Thread Adapters
- Cedar Wraps
- Cedar Wrap Concrete Anchors
- Level Indicators and Control Systems
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Guide Specifications – Corrugated Steel Water Tanks:
SHORT FORM
The contractor shall provide a RainFlo CGS corrugated steel water tank as shown on the drawings. The tank size, fittings and accessories shall be as shown on the drawings. The water tank system components shall be manufactured by and/or provided by RainHarvest Systems.
RAINFLO CORRUGATED STEEL WATER TANK SPECIFICATION
- The water tank shall be a RainFlo model _________ with a nominal capacity of ________ US gallons. The tank dimensions are _____’– _____” diameter, _____’ – _____” eave height, and _____’ – _____” overall height.
- A RainFlo water storage tank is a water storage product that uses a corrugated galvanized steel cylindrical tank in conjunction with a liquid-tight PVC liner. The tanks are built with a conical galvanized steel roof. Tanks are designed to be constructed and anchored to a concrete foundation.
- The tank is designed to store water with a density of 62.4 lbs./cu.ft.
- Wall sheets are continuous 4” pitch x ½” depth corrugated galvanized steel with a minimum yield strength of 40,000 psi and a minimum tensile strength of 55,000 psi minimum yield strength for 20 and 18 gauge sheets. All heavier gauges have a minimum tensile strength of 50,000 psi and a minimum tensile strength of 65,000 psi. The zinc coating conforms to G-115 specifications. Wall sheets have a 44” nominal coverage. Wall sheets have a coverage length of 9’ 4-1/2” long. The wall sheets are connected with GR8.2 bolts along both the vertical and horizontal seams.
4a. Vertical seams are punched for a staggered or double row connection at 2” on center.
4b. Horizontal seams are a single lap connection with spacing of 9-3/8”.
- Tanks are supplied with anchor brackets which bolt at the vertical seams and the center of the wall sheets.
- Water tank roofs have a 30 degree slope, are made up of self-supporting roof sheets, and are designed for 15 psf roof snow load.
The 12’ through 48’ diameter roof panels are triangular in shape and have formed structural ribs along the radial edges to provide stiffness and strength. The 12’ through 48’ panels extend past the eave to allow for drainage and are attached to the wall sheets with top ring angle sections that bolt around the entire circumference of the tank opening.
The 15’ through 24’ diameter roof panels are manufactured from G115 galvanized steel conforming to ASTM A563 GR33.
The 15’ to 48’ diameter tanks come with formed steel roof ladder rungs that bolt between the roof ribs of a single panel, extending from eave to peak.
The center opening for the 15’ through 30’ diameter tanks the opening is 33” in diameter.
Each 15’ through 48’ diameter water tank comes complete with one roof panel complete with an inspection hatch, to be located at the eave next to the roof ladder.
The 21’ through 48’ diameter roofs inspection hatch is circular with a 20.75” diameter.
- Water tanks are designed for 94 MPH (150 KPH) wind speed, UBC Exposure C.
- RainFlo water tanks are designed for Seismic Zone 2A. Many tanks will meet higher seismic zone loading requirements. Check with RainHarvest Systems Engineering for specifications.
- All bolts and nuts are galvanized with JS-500 coating. Roof bolts are hex-head and have factory installed PVC washers under a wide-flange shoulder. Wall sheet bolts have slotted round heads for ease of installation and minimal interaction with the liner.
- All bolts meet SAE Grade 8.2 or stronger.
- The liner shall be made from a flexible PVC material capable of containing water. Minimum liner thickness shall be 0.025 inches. All seams in tank liners are factory welded. The liner shall be suspended around the inside perimeter of the tank structure at the eaves with liner clips.
- Enhancements to meet potable water tank standards shall be provided separately.
- Erection and installation manuals are supplied with each tank.
RainFlo Corrugated Steel Water Tank Specifications:
Installation Manual:
Fire Connection Four Inch Assembly Drawing:
Anti-Vortex Plate Specifications:
Additional Information About Our NFPA Packages:
