The AT-FO Foam Proportioning Tank System is a pressure-type foam proportioning system widely used in oil depots, petrochemical plants, oil terminals, offshore platforms, tank farms and power stations.
The system consists of a foam tank, proportioner, inlet/outlet piping, valves, pressure gauge and safety devices. When pressurized water flows through the proportioner, foam concentrate is accurately inducted and mixed at a preset ratio (3% or 6%) to produce a stable foam solution for fire suppression.
The AT-FO series supports:
Flow range: 8–200 L/s
Tank volume: 300–25,000 L (0.3–25 m³)
Installation: Mobile or fixed
Orientation: Vertical or horizontal
Structure: Bladder type or non-bladder type
In the bladder-type system, a rubber bladder separates water and foam concentrate.
When water enters the tank, it compresses the bladder. The pressure differential forces foam concentrate through the suction tube into the proportioner, where it mixes with water to form foam solution.
Water and foam concentrate remain separated
No dilution of concentrate after operation
Concentrate can remain in tank for reuse
Reduced foam concentrate waste
In the non-bladder system, water directly contacts the foam concentrate inside the steel tank.
No bladder structure (simpler design)
After operation, tank must be drained, cleaned and refilled
Suitable for foam concentrates compatible with steel tanks
No risk of bladder damage
| Parameter | Specification |
|---|---|
| Flow Range | 8–200 L/s |
| Tank Volume | 300–25,000 L (0.3–25 m³) |
| Working Pressure | 0.6–1.2 MPa |
| Mixing Ratio | 3% or 6% |
| Deviation | ±10% |
| Installation Type | Fixed or Mobile |
| Tank Orientation | Vertical or Horizontal |
Seat / Nozzle / Orifice Plate / Diffuser
Body / Nozzle / Orifice Plate / Union Connector
| Type | Model | Flow Range (L/s) | Size | Working Pressure | Mixing Ratio |
|---|---|---|---|---|---|
| Single | AT-FO32 | 4–32 | DN100/150 | 0.6–1.2 MPa | 3% / 6% |
| Single | AT-FO48 | 12–48 | DN150 | 0.6–1.2 MPa | 3% / 6% |
| Single | AT-FO80 | 24–80 | DN100/150 | 0.6–1.2 MPa | 3% / 6% |
| Single | AT-FO96 | 48–96 | DN200 | 0.6–1.2 MPa | 3% / 6% |
| Combined | AT-FO32×2 | 4–64 | DN150 | 0.6–1.2 MPa | 3% / 6% |
| Combined | AT-FO32×3 | 4–96 | DN200 | 0.6–1.2 MPa | 3% / 6% |
| Combined | AT-FO48×2 | 12–96 | DN200 | 0.6–1.2 MPa | 3% / 6% |
| Combined | AT-FO80×2 | 48–160 | DN200 | 0.6–1.2 MPa | 3% / 6% |
Oil storage depots
Petrochemical plants
Oil terminals
Tank farms
Offshore drilling platforms
Power plants
Industrial fire suppression systems
System must operate within specified pressure and flow limits
Hydraulic calculation required to determine installation position
Ejection pressure must match downstream discharge equipment
Initial filling and commissioning must follow standard operating procedure
Bladder type tanks require leak inspection every six months
Do not mix different foam concentrates
Protect foam concentrate from sunlight
Replace aged foam after performance testing
Perform system simulation test after concentrate replacement
Clean bladder thoroughly when replacing concentrate
