Smothering the Blaze

Extinguishing Extreme Fires Worldwide

Retrofitted Boeing 747-700

Wildfires are an unfortunate reality in California and the Western United States. Larger and more destructive wildfires year-round result in 6,870 wildland fires that burn an excess of 1.5 million acres on average each year. To battle these blazes, the California Department of Forestry and Fire Protection (CAL FIRE) is responsible for the fire protection and stewardship of over 31 million acres of California’s privately-owned wildlands.

Amid intense wildfire challenges in September 2017 and again in July 2018, the Global SuperTanker B747-400 (“The Spirit of John Muir”) was activated by CAL FIRE to fight quickly spreading fires in Northern California, including the Ponderosa Fire located 10 miles east of Lake Oroville. The Global SuperTanker, representing the world’s largest aerial firefighting tanker, serves the nation and the world by providing air assistance to fight large scale, extreme fires effectively and efficiently.

The aircraft is the latest and largest in aerial firefighting and can drop nearly 18,600 gallons (approximately 155,000 pounds) of fire retardant or water across 150 feet, 1.8 miles to assist with fire-fighting efforts on the ground. In 2017, CAL FIRE estimated 17 million gallons of retardant was used across the state during 12,000 plane hours. In 2018, CAL FIRE activated and deployed Global SuperTanker again to battle fires in Northern California. 

The SuperTanker has the unique capability to be anywhere in the world in 24 hours or less with one fuel stop. In addition, the tanker, based in Colorado Springs, is approved to battles fires in other extreme settings such as marine environments where ship or oil platform fires are common.

California wildfire

The SuperTanker has the unique capability to be anywhere in the world in 24 hours or less with one fuel stop.

Cal Fire - forestry and fire protection

Retrofitting a Boeing 747-400 to Support Aerial Firefighting Efforts

The successful missions in the U.S. and elsewhere around the globe would not have been possible without Global SuperTanker’s meticulous planning that began many years in advance. In fact, according to Global SuperTanker VP of Maintenance Scott Olson, planning first started in the early 2000s and involved testing steel tanks in the middle of the desert. Years later, in 2015, the Global SuperTanker Services management team decided to put the concept back together making a configuration capable of meeting demanding performance requirements.

The company’s in-depth research to determine how to retrofit a Boeing 747-400 to meet aerial firefighting requirements led company executives to Victaulic. Global SuperTanker wanted to learn more about the capabilities of Victaulic’s grooved mechanical systems for mission-critical environments.

Specifically, this process involved finding the best pipe joining and coupling solutions to support Global SuperTanker’s patented system capable of delivering single drop in 13.2 seconds or multiple payload drops totaling nearly 18,600 gallons of water, fire retardant, or suppressant at speeds reaching 150 knots. The fluids can be released at variable rates from the plane’s pressurized tanks, producing a tailored response to the firefighting need. This unique ability allows it to make as many as six drops in a single flight. Global SuperTanker’s independent system has left and right-hand side tanks that can do multiple drops from either side or a full drop.

Through conversations with Victaulic, Global SuperTanker became convinced that Victaulic’s Style 77 flexible coupling (6-inch and 10-inch) and Style 07 Zero-Flex Rigid couplings (10-inch and 16-inch) were the ideal solutions to reliably withstand the high shock load and movement that occur in aerial fire containment environments. For Global Supertanker, this involves carrying and discharging large volumes of liquids—resulting in a rapid high-pressure change from 0 to 50 PSI if required—over a couple miles.