Water & Fire Systems
Everything between the truck’s gearbox and the nozzle — the PTO-driven pump that makes the flow, and the monitor or hose line the water leaves through.
One System, Three Parts
A water truck and a fire truck are the same machine in outline. The power take-off turns a pump off the gearbox; the pump makes the flow and the pressure; pipework carries it to the back or the roof; and a monitor, a spray bar or a hose line is where the water leaves. Each part has to agree with the one beside it, which is why they are chosen together rather than one at a time.
Pick from the far end backwards. What the water has to do when it leaves the truck decides the flow and the pressure; those decide the pump; and the pump decides the PTO and the ratio it needs. Tell us the last step and the rest follows from it.
What Goes on the Truck
Matching the Pump to What It Feeds
A monitor and a nozzle make no pressure of their own. Both pass on what the pump sends them, so the pump has to deliver the flow they are rated for at the pressure they work at. These are the ratings we publish; the connections, the gear ratio and the speed each pump wants from the PTO are confirmed per order.
| Part | Rated at |
|---|---|
| Fire pump | 40 and 50 L/s at 10 bar |
| Fire monitor | 30 and 40 L/s at 10 bar, works 6–12 bar |
| Hand nozzle | 8 L/s per line |
| Water pump (GR-3) | 1,500 L/min, 3-inch |
The 40 L/s pump and the 40 L/s monitor are the exact pair — same flow, same working pressure. Everything else is a calculation, and it is one we would rather do for you than have you guess at: tell us what the truck has to do and we will say which parts agree.
Frequently Asked Questions
Do I need all three?
No. Most trucks need a pump and one way for the water to leave — a spray bar on a water truck, a monitor or a hose line on a fire truck. The three pages are here so you can see what we make for each part, not because a truck needs one of each.
Water pump or fire pump?
The job decides it. A water truck is about volume: filling and emptying a tank, washing a road, watering a site, and the pump is sized in litres per minute. Firefighting is about pressure and reach, so a fire pump is sized by the litres per second it gives at 10 bar, the pressure monitors and hose lines are built around.
Can one pump feed a monitor and hose lines at the same time?
It depends on adding the flows up. A monitor and every line running at once draw their rated flow together, and the pump has to cover the total at the working pressure, not one at a time. Tell us how many outlets the truck will run and we will work out which pump covers it.
What do you need to quote a whole system?
The truck and its gearbox, the PTO you have or plan to fit, and what the water has to do when it leaves — the monitor or the number of hose lines, or the tank size and the time you have to fill it. That is enough to work back to the pump and the ratio.
Fitting Out a Water or Fire Truck?
Tell us the truck and what it has to do, and our team will put the pump, the pipework and the monitor together for it.