A mobile pump unit (MPU) is a transportable firefighting pump designed to supply water at the flow rate and pressure required for emergency firefighting operations.
Unlike a fixed fire pump installation, a mobile pump unit can be deployed wherever additional firefighting capacity is required. Mobile pump units are commonly used to supply water to firefighting monitors, hose lines, temporary water distribution systems and other mobile firefighting equipment, making them valuable assets at industrial facilities, tank farms, terminals, refineries, ports, and other high-risk sites.
In practical terms, an MPU transfers water from an available source and delivers it at the pressure and flow required by the firefighting system.
Mobile pump unit vs. fixed fire pump
A fixed fire pump forms part of a permanently installed fire protection system and is connected to dedicated fire water infrastructure. A mobile pump unit performs the same pumping function but can be transported and deployed wherever additional firefighting capacity is required.
This flexibility makes mobile pump units particularly valuable during emergency response, temporary fire protection during maintenance or shutdowns, and incidents where fixed infrastructure is unavailable or cannot provide the required hydraulic performance.
When is a mobile pump unit used?
Mobile pump units are commonly used when:
- A permanent fire water system is not available
- Existing fire water infrastructure does not provide sufficient flow or pressure
- Temporary firefighting protection is required during maintenance or shutdowns
- Emergency response equipment must be deployed to different locations
- Water must be supplied from natural sources such as rivers, reservoirs, harbours or seawater intakes
Because they are transportable, mobile pump units provide operational flexibility without relying entirely on fixed firefighting infrastructure.
How does a mobile pump unit work?
A mobile pump unit draws water from an available source and delivers it at the flow rate and discharge pressure required by the firefighting equipment.
Depending on the available water supply, an MPU typically operates in one of two modes.
Drafting from an open water source
When no pressurised water supply is available, water must be taken from an open source such as a river, reservoir, harbour or seawater intake before being delivered to the firefighting system.
Conventional mobile pump units achieve this by drafting water through a suction hose. Because centrifugal pumps rely on atmospheric pressure to move water into the pump, this method is subject to practical suction lift limitations. Actual performance depends on factors such as suction lift, hose configuration, friction losses, water temperature and site conditions.
An alternative approach is to use a submersible lift pump, such as the FFS SFP 300 LP, which operates directly in the water source. By eliminating the need for suction lift and pump priming, submersible lift pumps provide a reliable, high-volume water supply in locations where conventional drafting may be difficult or impractical. They can be used to supply mobile pump units or other firefighting systems during large-scale emergency response operations.
Boosting an existing water supply
Where a pressurised water supply already exists, such as a fire water main or hydrant network, a mobile pump unit can increase the available pressure and, depending on the system characteristics, increase the flow available to the firefighting operation.
This operating mode is known as boosting.
Boosting is commonly used where the existing water supply alone cannot meet the hydraulic requirements of the firefighting equipment. Depending on the application, a mobile pump unit can supplement an existing fire water system by providing additional hydraulic performance where it is needed.
What makes a mobile pump unit self-contained?
Industrial mobile pump units are designed to operate without relying on external electrical power or permanent infrastructure.
Typical features include:
- A diesel engine to drive the pump
- An onboard fuel supply for extended operation
- Battery starting systems
- Integrated engine cooling
- Control and instrumentation systems
- Suction and discharge connections for rapid deployment
These features enable trained operators to place the unit into service quickly, provided that a suitable water source and the necessary firefighting equipment are available.
Choosing the right mobile pump unit
Selecting the correct mobile pump unit begins with understanding the operational requirements of the site.
Important considerations include:
- Required flow rate
- Required discharge pressure
- Type and location of the available water source
- Expected operating duration
- Site access and transport requirements
- Compatibility with existing firefighting equipment
The appropriate MPU depends on matching the pump's hydraulic performance to the available water source and the operational requirements of the site.
Why pump performance matters
Every firefighting application has different requirements.
Supplying a single firefighting monitor requires different flow and pressure than supplying multiple monitors, long hose lays or temporary firefighting systems across a large industrial site.
For that reason, pump selection should be based on verified performance data and evaluated against the expected operating conditions rather than nominal performance figures alone.
Maintenance and testing
Like any emergency response equipment, mobile pump units require regular inspection, testing and maintenance to ensure they remain ready for operation.
A typical maintenance programme includes:
- Engine testing
- Pump performance testing
- Inspection of fuel and cooling systems
- Battery testing
- Inspection of valves, manifolds and couplings
Regular testing helps verify that the unit continues to perform as intended and is ready for deployment when required.
Mobile water supply solutions from FFS
FFS designs and manufactures complete mobile water supply solutions for industrial firefighting applications.
Our portfolio includes:
- Mobile pump units
- Submersible lift pumps
- Rapidly deployable monitor trailers
- Jet pump proportioners
These systems are engineered to work together to provide reliable water supply and firefighting performance across a wide range of industrial applications, from supplementing existing fire water systems to supplying water directly from open sources.
Whether you're expanding firefighting capacity, increasing resilience or developing a mobile emergency response capability, selecting the right equipment is essential to delivering the required flow and pressure when it matters most.
Explore the FFS range of mobile pump units here:
https://fifisystems.com/mobile-pump-units/
The information presented is intended for general informational purposes only and reflects generally accepted fire protection practice. Fire protection requirements vary between facilities, jurisdictions and operating environments. Site-specific solutions should always be based on applicable codes and standards, qualified fire protection engineering and hazard-specific risk assessments.
