South Dakota

South Dakota

New Machine Builds Better Fuel Breaks on the Prairie

Huron Wetland Management District 2007

The Huron Wetland Management District in South Dakota has tested and approved the use of a new "blackline" machine that will allow them to create more effective fire breaks throughout the prairie regions of North Dakota, South Dakota, Nebraska and Kansas.

This specialized equipment reduces hazardous fuels while quickly creating fire break lines, especially in WUI areas or where natural fire breaks such as roads or waterways aren't available. It is particularly beneficial in the plains area where bulldozing or disking the native sod to create a fire line is prohibited.

During the evaluation process, experts in environmental safety, heavy equipment safety, fire and operations and fire line safety, monitored and observed the operation, which included creating a five-foot wide, mile long fire line in an hour.

Spray heads on either side of both chambers create a wet line while fuels burn away inside the chamber

The machine consists of an enclosed burning chamber with propane burners and a water spray system, mounted on skids. As it is pulled along the ground by a tractor, dry vegetation is ignited by the gas burners, and burning occurs within the chamber. The water spray heads create a wet line on either side of the burning chamber, preventing the sideways spread of flames as the equipment moves forward.

Blackline machine creates a wide black line without the need to do a separate controlled burn between the two parallel black lines

Typically, a fire break along the boundaries of private lands near waterfowl nesting areas is a 20- to 30-foot wide mowed area. Adding this “black line” to the mowed fire break provides an additional safety measure that helps fire staff complete more prescribed burns throughout the spring and fall and reduce the risk of uncontrollable wildfires.

Tractor pulling support trailer, Burner and Afterburner.

The blackline machine originated in South Africa where it is used to manage rangeland fires and create protective areas between mines and communities.  Designed for use on flat prairies and savannahs, it can handle grass up to three feet tall.

Because the organic component of prairies is higher than that of the South African rangeland, fire staff considered whether that would create a risk of creeping fires.  Slowing the speed at which the equipment was pulled, and adding foam to the water were ways they addressed that issue.

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