Office of Emergency Response (OER) Media Fact Sheet for In-Situ Burning of Oil Spills
An effective way to remove oil from the surface of water is through controlled burning, called in-situ
burning. In-situ burning can remove approximately 100 gallons/day/square foot of surface area under
ideal conditions. By removing oil from the water surface, we are protecting birds, marine mammals,
turtles, and the sensitive Florida coast from the effects of the oil spill.
Burning oil spills produces a visible black smoke plume that may be seen for many miles.
The burning of oil converts oil into its primary combustion products,
carbon dioxide and water, with a small percentage of unburned and
residue by-products. Typically, 90-95 percent of the smoke is carbon
dioxide, particulates account for 5-10 percent, with the remainder
primarily carbon monoxide, nitrous oxides and sulfur dioxide. These
emissions are rapidly dispersed and diluted downwind of the burn. For
this reason, in-situ burning is conducted only when the winds are
blowing away from or at sufficient distance from population centers.
In-situ burning is always conducted under controlled conditions. First, two ships deploy a
specially constructed fire boom between them, one end attached to each
ship. The boom can be anywhere between 300-500 feet long. The boom takes
on a U configuration as it is towed by the two ships at about
three-fourths of a knot. Oil is gathered inside the U, moved to a
location away from the main spill and is set on fire. By controlling the
rate of speed of the ships, the rate of the burn can be increased,
decreased, or even extinguished. The residues left in the boom after the
burn is over will be recovered by conventional means.
Ignition of the oil can be accomplished in a number of different ways. One way is with a Heli-torch.
A Heli-torch is a device that is attached to a helicopter and aerial releases burning gelled fuel on the oil. Additionally, specially
designed pyrotechnic devices (such as a Pyroid igniter or Dome igniter)
can be released by hand from one of the ships towing the boom and
allowed to float back to the oil, or it may be dropped by a helicopter
on the oil.
In-situ burning can only be conducted when the weather conditions are favorable.
Generally, if the sea is two to three feet or less, in-situ burning is possible. If
the seas get too high, in-situ burning will be discontinued.
Florida Department of Environmental Protection
Office of Emergency Response (850)245-2010