WATEX foam bladder tanks are available from AZEIDK in Saudi Arabia, UL listed with their ratio controller to UL 162 (certificate EX29807). They come vertical from 200 to 7,500 L and horizontal from 1,000 to 15,000 L, rated at 175 psi, and run on the fire water pressure itself, with no foam pump or electricity.
This guide gathers the full tank data from the manufacturer’s catalogue and the UL certificate: capacities, materials, pressures, the range of each ratio controller size, and how to choose the size. For how the proportioning system itself works, read foam proportioning and bladder tanks.
Key points
- Approval: UL certificate EX29807, category Proportioners, Foam Concentrate, to UL 162, issued 3 June 2026.
- Capacities: vertical 200 to 7,500 L, horizontal 1,000 to 15,000 L.
- Rated pressure 175 psi, minimum working pressure 30 psi, and a hydrostatic test on every tank.
- Ratio controllers from 65 to 200 NB, the largest covering up to 17,000 L/min of foam solution.
- 5-year manufacturer’s warranty; catalogue and certificate on the product page.
In this article
- How does a WATEX foam bladder tank work?
- What is the technical data for WATEX foam tanks?
- What is the range of each ratio controller size?
- How do you choose the tank capacity and ratio controller size?
- What optional items are available with the foam tank?
- Frequently asked questions about WATEX foam tanks
- Order a WATEX foam tank from AZEIDK
How does a WATEX foam bladder tank work?
The tank is a steel pressure vessel holding a flexible nitrile bladder filled with foam concentrate. When the system operates, network water enters the space between the bladder and the shell, squeezes the bladder and pushes the concentrate to the ratio controller, which mixes it with water at the set ratio across the flow range. After operation the water is drained and the bladder is refilled with concentrate; the vessel does not need to be removed.
What is the technical data for WATEX foam tanks?
| Item | Value per the catalogue |
|---|---|
| Tank type | Vertical or horizontal |
| Nominal capacity | Vertical 200 to 7,500 L, horizontal 1,000 to 15,000 L |
| Performance standard | UL 162 |
| Rated pressure | 175 psi (12.3 kg/cm²) |
| Minimum working pressure | 30 psi (2.1 kg/cm²) |
| Design pressure | 13.75 kg/cm² |
| Hydrostatic test | 18.5 kg/cm² on every tank (1.5 × rated pressure) |
| Operating temperature | 2 to 65 °C |
| Design code | ASME Section VIII Division 1 |
| Shell and dished ends | SA-516 Gr. 70, 2:1 ellipsoidal |
| Bladder | Nitrile (Buna-N), fabric reinforced, replaceable on site through the manhole |
| End connections | Flanged, ASME B16.5 Class 150 |
| Finish | Fire red RAL 3000 |
| Warranty | 5 years |
The UL certificate describes the listed products in gallons: horizontal from 264 to 3,963 gallons and vertical from 53 to 1,982 gallons, with ratio flow controller models WTX-BT and WTX-SS.
What is the range of each ratio controller size?
| Size | Foam solution flow (L/min) | Foam solution flow (gpm) | Concentrate inlet | Equivalent length (m) |
|---|---|---|---|---|
| 65 NB (2½ in) | 100 to 1,300 | 26 to 343 | 1¼ in | 5.6 |
| 80 NB (3 in) | 250 to 2,450 | 66 to 647 | 1½ in | 5.3 |
| 100 NB (4 in) | 700 to 5,800 | 185 to 1,532 | 2 in | 8.7 |
| 150 NB (6 in) | 1,190 to 12,310 | 314 to 3,252 | 2 in | 20.5 |
| 200 NB (8 in) | 2,500 to 17,000 | 660 to 4,491 | 3 in | 9.4 |
The catalogue states that these are the UL-listed flow ranges, and that the equivalent length is for Schedule 40 pipe with a Hazen-Williams C of 130, for use in the system’s hydraulic calculation.
How do you choose the tank capacity and ratio controller size?
- Ratio controller size: choose the size whose range contains both the minimum and maximum design foam solution flows. Example: a system between 900 and 4,000 L/min suits the 100 NB size.
- Tank capacity: calculated from the maximum solution flow × concentrate percentage × required discharge time in the design, then the next larger tank is chosen.
- Vertical or horizontal: vertical saves floor space up to 7,500 L; horizontal suits large capacities up to 15,000 L or limited headroom.
- Concentrate compatibility: the concentrate type and percentage are set by the system design and its datasheet.
AZEIDK supplies SafeGuard AFFF concentrate at 3% and 6% to fill the tank, and 1% concentrate is coming soon. For choosing the brand and the 1%, 3% or 6% rate, see our guide to AFFF foam concentrate in Saudi Arabia.
What optional items are available with the foam tank?
- Water and foam spools, and water and foam charging valves.
- Vent and drain valves, pressure gauges, a level indicator and a relief valve.
- A ladder for tanks of 1,000 L and above, a concentrate filling kit and a foam concentrate control valve.
- A ratio controller with a carbon steel body instead of stainless steel, and seaworthy wooden packing.
- Any capacity or item not in stock, AZEIDK can supply on request.
Frequently asked questions about WATEX foam tanks
Are WATEX foam tanks UL listed?
Yes. The tank with ratio controller is UL listed to UL 162 under certificate EX29807, published on the product page.
What capacities do WATEX foam tanks come in?
Vertical from 200 to 7,500 L and horizontal from 1,000 to 15,000 L per the catalogue.
Does a bladder tank need a pump or electricity?
No. It runs on the fire water pressure, with a minimum of 30 psi per the catalogue.
Can the bladder be replaced?
Yes. The catalogue states the bladder can be replaced on site through the manhole.
What is the warranty on WATEX foam tanks?
5 years per the manufacturer.
Order a WATEX foam tank from AZEIDK
Send the foam solution flow, concentrate percentage and discharge time, and we will size the tank and ratio controller and send a quotation with the catalogue and certificate. Product page · Talk to the AZEIDK team
