By Alan M. Petrillo
Fire pumps have been mounted in the front, rear, and center of fire vehicles, but mainly the midmount fire pump has been the clear favorite of fire departments over the years.
Front-mounted pumpers seem to have dwindled to very low numbers in department fleets, while rear-mount fire pumps have experienced a resurgence in popularity in recent years. The reasons some departments are choosing rear-mount pumps instead of midmounts revolve around the pros and cons of each pump location on the vehicle as well as how firefighters plan to use the pumpers.
Rear-Mount Pumps
Scott Oyen, vice president of sales for Rosenbauer, says there are a number of advantages to mounting a fire pump at the rear of a vehicle. "A rear-mount pump allows a smaller envelope truck with the same amount of compartmentation," he says. "Plus, access to the hosebed is generally better."
Grady North, product manager for pumpers, tankers, and aircraft rescue and firefighting (ARFF) for E-ONE, thinks the number one reason fire departments spec a rear-mount pumper is to get a shorter vehicle. "Taking the pump module away from the center of the truck and putting it at the rear means you shorten the vehicle the width of the pump module," North says. "That's more in line with an urban interface vehicle, which is highly maneuverable."
Mike Harstad, Rosenbauer's aerial and pumper products manager, notes that rear-mount pumpers offer significant advantages in terms of maneuverability, safety, and increased compartment space. "Rear-mount pumpers are typically three to four feet shorter than a standard pumper, which makes them more maneuverable. The space where the pump house would have been in the center of the truck becomes a transverse compartment that allows a significant increase in compartment space."
Chad Trinkner, director of fleet management for Pierce Manufacturing Inc., believes that a rear-mount pumper has the advantage of greater compartmentation. "With the pump at the rear of the vehicle, the pump house doesn't take up as much valued space on the pumper as a traditional midship pump," he says. "The disadvantage is that the driveshaft is longer when the pump components are placed in the rear."
Jim Kirvida, president of CustomFIRE, says the rear-mount pump concept is more beneficial on a custom chassis or two-door commercial chassis. "That allows you to shorten the truck dramatically," Kirvida says. "With a 1,000-gallon water tank and a 40-inch pump module, you can get a 120-inch cab-to-axle measurement on a typical pumper. If you put the pump in the rear, you can move the water tank forward and balance the load better while you're maximizing the amount of water you carry."
Kirvida says that Freightliner and Kenworth chassis are very popular for rear-mount pumpers. "We are able to get a decent compact overall length on those chassis, with 1,000- to 1,500-gallon water tanks and 1,250-gallon-per-minute (gpm) pumps at the rear," he says. However, compartmentation is generally greater on a rear-mount pumper, Kirvida maintains. "You lose the rear compartment, but you can have a large transverse compartment that's 96 inc