NTSB determines cause of towboat engineroom fire

Written by Nick Blenkey
Engine room fire led to total loss of towboats

Engine room fire resulted in total loss of vessel. Seen here is the starboard side of the Miss Dorothy during firefighting efforts from the Good Samaritan towing vessel Christopher Wilson. [Image; NTSB/ Western Rivers Boat Management Inc.]

The NTSB (National Transportation Safety Board) has issued its report on a March 2021 incident in which an engineroom fire broke out aboard the 1956-built towboat, Miss Dorothy, owned and operated by Paducah, Ky.-based Western Rivers Boat Management

On March 17, 2021, about 12:45 a.m. local time, the Miss Dorothy was pushing 14 barges upbound on the Lower Mississippi River, about 20 miles north of Baton Rouge, La., near Mile 249, when a fire broke out in the engineroom.

“Within two minutes of the fire alarm sounding, the captain, who had been sleeping, responded to the pilothouse and relieved the pilot, who went to assess the fire and assist the crew,” says the NTSB report. “Using the vessel’s VHF radio, the captain attempted to notify the Coast Guard of the fire but did not receive a response. He was able to establish communications with the towing vessel Christopher Wilson, which was owned by the same company and happened to be about three miles south of the Miss Dorothy’s location. The Christopher Wilson notified the Miss Dorothy that Coast Guard Sector New Orleans had received the distress call and was attempting to respond. At this time, the pilothouse of the Miss Dorothy was filling with smoke from the fire, and the captain could see the glow of flames coming from the stern of the vessel.”

FIRE CONTINUED TO GROW

Despite the crew’s efforts to contain the fire, it continued to grow. About 12:52 a.m., the captain ordered the crew to abandon ship. The pilot and crew mustered on the forward end of the vessel before being joined by the captain from the pilothouse. About 1 a.m, the crew of the Miss Dorothy evacuated the vessel to the tow’s barges.

“While on the barges,” says the NTSB report, the crew communicated via cell phone with the captain on the Christopher Wilson, whose crew was in the process of tying off their tow to shore several miles downriver in order to better assist the distressed Miss Dorothy. As the fire continued to spread, engulfing the Miss Dorothy’s superstructure, the river current turned the tow around and pushed it downriver. About 45 minutes after the crew evacuated the Miss Dorothy, the Christopher Wilson arrived, positioned itself alongside the barges to pick up the crew, and pushed the Miss Dorothy and its tow into the left descending bank at Mile 244. The crew of the Christopher Wilson, assisted by the crew from the Miss Dorothy, fought the fire using fire hoses aboard the Christopher Wilson.”

The fire was extinguished several hours later by first responders and the crew aboard the Christopher Wilson.

No pollution or injuries were reported. Damage to the vessel was estimated at $2.4 million and it was determined to be a total loss.

The NTSB notes that regulations for towing vessels state that “piping and machinery components that exceed 220°C (428°F), including fittings, flanges, valves, exhaust manifolds, and turbochargers, must be insulated.”

Investigators found that the exhaust header leading from the individual cylinder heads to the exhaust manifold in the Miss Dorothy—which were subject to temperatures greater than 428°F (often higher than 600°F)—near the suspected origin of the fire were uninsulated. NTSB investigators concluded it is likely that the uninsulated exhaust header acted as an ignition point for the atomized or spraying diesel fuel.

PROBABLE CAUSE

The NTSB determined the probable cause of the engine room fire was the ignition of spraying diesel fuel from a main engine’s fuel system onto an uninsulated section of the engine’s exhaust system. Contributing to the severity of the fire and damage to the vessel was the inability to effectively secure ventilation to the space and fuel to the affected engine.

LESSONS LEARNED

The NTSB report references several earlier towboat engineroom fire cases, including a December 2017 incident involving the J.W. Herron.

​“Enginerooms contain multiple fuel sources, making the spaces especially vulnerable to rapidly spreading fires,” says the NTSB report. “Uninsulated engine exhaust surfaces can provide an ignition source for flammable liquids that can easily develop into fires that are difficult to contain. Towing vessel owners and operators, Coast Guard marine inspectors, and third-party organization (TPO) towing vessel examiners should be aware of these dangers and fire risks and should regularly and thoroughly inspect equipment to ensure that measures are in place to prevent flammable liquids from coming into contact with hot surfaces.”

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