There are many ways to extinguish a fire, but the easiest and most efficient method is still water. Therefore, the most important tool of a fire brigade is the firefighting pump.
Operators have many responsibilities during an operation: monitoring and controlling the vehicle as well as the pump are critical aspects. The operator must cope with numerous interruptions during operations. The pump must be kept from running dry and overheating must be avoided, for example. If a pump runs in stand-by mode with closed discharge outlets, energy is converted into heat. At a pressure of 10 bar without receiving water, the pump can heat up at a rate of ~5 °C per minute. This can cause the pump to overheat and, in addition to posing a risk of scalding, cause damage to the pump. To stop this from happening, our pumps can be equipped with an over-temperature valve. This valve opens at 55 °C to introduce cooler water to cool the pump.
Our unique pump design combined with clever options supports operators to prevent damage to the pump when they are distracted, which frequently happens in stressful situations. Another innovation is our new pump material, duplex stainless steel.
Our last blog, “Water On,” reported that bronze is the best available material for firefighting pumps. Rosenbauer now offers the N55 and N35 with duplex stainless steel, which achieves even better resistance to wear.
Duplex stainless steel consists of a steel alloy of two steel groups. The first steel group is characterized by high corrosion resistance (austenitic steel) and the second by high resistance (ferritic steel). The alloy combines the advantages of both steel groups. The duplex stainless steel we use for our pumps is lighter and more resistant to abrasion than bronze.
By the end of 2017, the combined normal/high pressure pumps will also be available with optional duplex stainless steel.