BY ALAN M. PETRILLO
The trend toward carrying as much water as possible on a fire apparatus means there must be efficient methods of filling water tanks and getting the water out of them.
Tankers and pumper-tankers each have their own typical arrangement of intakes and discharges, but some fire departments are asking manufacturers to be creative when locating both dump valves and intakes.
Discharge Types
Greg Lewis, inside sales manager for Spartan ER, says his company has built a tanker with a 16-inch dump valve for Hillsborough County (FL) Fire and Rescue. "It was an unusual installation," Lewis says. "It was a large air-operated butterfly valve that went on the rear of a 3,500-gallon elliptical tanker. The fire department was able to get a 3,100-gallon-per-minute (gpm) flow out of it." He adds that when the mission is pure water handling, whether on a single- or tandem-axle tanker, one dump at the rear of a wetside tanker where the tank is outside of the body allows Spartan ER to lower the center of gravity of the truck and lower the cost too.
Ryan Slane, pumper-tanker product manager for KME, notes that "the latest trend is a single rear dump with a 180-degree swivel that's integral with the water tank. It's one dump, which means less body work, less weight, and less cost of two additional side dumps."
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1 Pierce Manufacturing Inc. installed a 10-inch round side dump on each side of this tanker built for a South American fire department, along with a 10-inch rear dump. (Photo courtesy of Pierce Manufacturing Inc.) |
David Stock of A.H. Stock Manufacturing, says his company makes the Newton Kiwk-Dump Valve, named for the town where it was invented. "Our 1010 plunger-style valve will flow 2,940 gpm, while our 1050 model, where the plunger flips straight up into the water tank, will flow up to 3,570 gpm," Stock says.
A.H. Stock makes the Newton Kwik-Dump Valve in both steel and stainless steel models, although Stock notes that nearly 70 percent of those sold are stainless steel. A.H. Stock also makes an extend-a-chute and a swivel chute that allow water to be dumped over a 180-degree arc. "Our telescoping chute extends 36 inches, and we also have a slip-on chute that gets attached manually," he says. "We offer both electric and air operation for our chutes and valves, although it's almost 99 percent electric on the valves now."
David Durstine, vice president of marketing for Akron Brass Co., points out that Akron Brass has one product that can be used as a dump valve. "It's an eight-inch round butterfly valve that can be built for manual, air actuation, or electric operation," he says. "The most versatile is electric operation because it allows more finite control of the valve, while with air, it is either open or closed." The butterfly valve is available in sizes from four to eight inches around.
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