Foam Trailers and Mobile Fire Suppression Units for Remote Sites
A mobile fire suppression unit is a trailer or skid that carries its own agent and its own means of discharging it, so that a site with no hydrant, fire water main or permanent fire crew still has something larger than a wheeled extinguisher to put on a fire. Foam trailers carry water or foam solution with a pump and proportioner; dry chemical trailers carry powder and nitrogen; twin-agent units carry both. The choice depends on the site hazard, how far the unit must be towed, and how long it will sit between uses.
Why Remote Sites Need a Unit on Wheels
Remote drilling pads, frac sites, tank batteries, compressor stations, pipeline pump stations and construction-phase terminals may be far from municipal fire protection. A fixed foam system may not be practical, while a wheeled extinguisher provides only limited agent and discharge time. A mobile fire suppression trailer bridges that gap by carrying enough agent to control a larger fire and allowing the unit to move between locations.
Foam Trailers: Water, Concentrate and the Pump
A foam trailer typically carries a water tank, concentrate tank, pump, proportioner, hose reel and foam nozzle. Some units use premixed solution instead of separate water and concentrate, eliminating the proportioner but tying the unit to a specific foam type and its storage requirements.
A 500 gallon solution tank discharging at 60 gpm provides a little over eight minutes of discharge. At an application rate of 0.10 gpm per square foot, that flow covers approximately 600 square feet; at 0.16 gpm per square foot, it covers approximately 375 square feet. The actual required application rate should be based on the applicable standard and the foam manufacturer's listing.
Foam is particularly useful for pool fires and flammable-liquid spills because it forms a blanket over the fuel surface and helps control reignition. It is less suited to pressure-fed fires, electrical equipment and other hazards where the agent needs to act directly on the flame.
Dry Chemical Trailers and the ZEUS Titan
A dry chemical trailer carries an agent tank and nitrogen cylinders instead of water and a pump. Salus Global builds dry chemical skids in 350, 1,000 and 2,000 lb capacities, with an agent tank, nitrogen cylinders, hose reel and hand nozzle.
The ZEUS Titan provides a mobile dry chemical configuration for remote firefighting applications. Unlike a foam trailer, it does not depend on a pump, engine or compressor to discharge the agent. The operator positions the unit near the hazard and uses the stored nitrogen to discharge the dry chemical.
Dry chemical is effective for rapid flame knockdown on many Class B hazards and can also be used around energized electrical equipment when the selected agent and system are appropriate. Its limitations include residue, wind sensitivity and the lack of cooling. A hot vessel, engine component or other surface may cause reignition after the initial knockdown.
Specifying or replacing a unit? Request a quote or request drawings for your hazard.
Twin-Agent Trailers: Both Agents on One Frame
Twin-agent units combine dry chemical and foam capability on one mobile platform. Dry chemical provides rapid flame knockdown while foam can be used to cover a liquid fuel surface and help control reignition.
| Mobile Unit | Agent Carried | Power on Board | Best For | Limitations |
|---|---|---|---|---|
| Foam trailer | Water and concentrate | Engine and pump | Pool fires and exposure cooling | Pressure-fed and electrical hazards |
| CAFS trailer | Water and concentrate | Engine, pump and compressor | Class A fires, pools and longer throw | Higher complexity and cost |
| Dry chemical trailer | Powder and nitrogen | None | Fast flame knockdown and three-dimensional fires | Residue, wind and reflash risk |
| Twin-agent trailer | Powder, foam and nitrogen | None | Combined fuel and pool hazards | Weight and foam storage requirements |
Towing, Weight and Placement
Weight is an important part of mobile-unit selection. A dry chemical trailer must account for the agent charge, vessel, nitrogen cylinders and trailer frame. Foam trailers become significantly heavier when carrying water, often requiring larger tow vehicles and tandem axles.
Water-based units may arrive empty and be filled on site, while dry chemical units can arrive ready for use. Any trailer used on public roads should be configured for applicable transportation requirements, including appropriate brakes, lighting and markings.
At the site, position the unit where the operator can reach the hazard while maintaining a safe retreat path. Whenever practical, place the unit upwind of the hazard and outside the expected fire area. Hose length should be checked against the actual distance from the unit to the farthest point of the hazard.
Keeping a Mobile Unit Ready to Work
Mobile units spend much of their service life in storage, making maintenance critical. Foam trailers require attention to the engine, fuel, concentrate, water storage, pump and proportioner. Premixed solutions must be managed according to the foam manufacturer's storage and replacement requirements.
Dry chemical units require inspection of the agent condition, nitrogen pressure, hose, nozzle, actuation system and tank. The agent should be checked for moisture and caking, particularly on units exposed to vibration during transport. Trailer tires, bearings, hitch components, brakes and lights also need routine inspection.
Frequently Asked Questions
How much agent should a wellsite trailer carry?
The unit should be sized for the largest credible fire identified in the site's fire risk assessment and provide enough agent to knock the fire down while the fuel source is isolated. For many drilling and completion applications, a 1,000 lb dry chemical unit may be appropriate, while larger hazards may require greater capacity or a combined system.
Can one trailer cover several sites?
It can, provided the unit can reach the site within the response time established by the emergency plan. Shared mobile units are particularly useful when they move with high-risk operations such as drilling, completion or fracturing activities.
Does a trailer unit need to be UL listed?
Listing requirements depend on the project, owner, insurer and authority having jurisdiction. Where a listed system is specified, the equipment should match the applicable listing and manufacturer configuration rather than being assembled from unrelated components.
Request a Quote for a Mobile Fire Suppression Unit
The ZEUS Titan trailer brings fire suppression capability to sites without permanent fire protection infrastructure.
