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SUMMER 2003 ISSUE

The Wind Scoop Boat News - News - Articles - Features Marinas

BOATING SAFETY: 

Carbon Monoxide Hazards on Recreational Boats

In February 2001, the U.S. Coast Guard issued an advisory for all houseboat owners, stating that there was a danger of carbon monoxide poisoning on "vessels equipped with swim platforms and exhaust systems vented into a stern cavity. This design has been found to permit lethal concentrations of carbon monoxide to build up in the vicinity of the swim platform. "

Carbon Monoxide, the "silent killer", is a by-product created by engines that provide electricity through the combustion of carbon-based materials such as gasoline, propane, kerosene, charcoal, and wood. When CO (carbon monoxide) gas collects in an enclosed space it can become fatal, even if a person only breathes it in for a short period of time.

On a boat, the exhaust is often vented from the stern of the craft. This is usually* fine when the vessel is moving; engine emissions are blown away from the boat. But when the boat is stationary (anchored, or at a dock or mooring), and an engine or generator is running in order to power air conditioning units and electric appliances, the gas can build up near the stern of the boat where the exhaust is vented. This cloud can be lethal to anyone who ventures near the stern. It can be especially lethal to a person who is swimming from a swim platform at the back of the boat. CO is heavier than air, and tends to float atop the surface of the water. A swimmer's head is often right at the surface where the build up is heaviest. Even more dangerous is when the exhaust is vented into a stern cavity near the swim platform where it cannot be dissipated by the breeze. Several houseboat manufacturers have issued recalls on their vessels with this design. (See the U.S.C.G. article for more information.)

*There is also a danger when the vessel is moving: "Exhaust can re-enter boats when cruising under certain conditions – the station wagon effect – especially with canvas in place. Exhaust can also collect in enclosed spaces near the stern swim platform."

A boat owner should check to make sure that the vessel's exhaust is properly vented, but even properly vented exhaust can cause a problem if the boat is "moored to close to a dock or another boat, or if the exhaust is pushed back by prevailing winds." The U.S. Coast Guard makes several recommendations:

  • Schedule regular engine and exhaust system maintenance inspections by experienced and trained mechanics.
  • Be aware that dangerous concentrations of carbon monoxide can accumulate when a boat, generator or other fueled device is operated while the boat is at a pier, seawall or alongside another boat. Do not run engines or equipment for extended periods of time under these conditions or without continuous monitoring.
  • Keep forward facing hatches open to allow fresh air circulation in accommodation spaces, even in inclement weather.
  • Keep people clear of the rear deck area and swim platform of the boat while either the generator or engines are running. Always monitor the swimming area.
  • Do not confuse carbon monoxide poisoning with seasickness or intoxication. If someone on board complains of irritated eyes, headaches, nausea, weakness or dizziness, immediately move the person to fresh air, investigate the cause and take corrective action. Seek medical attention, if necessary.
  • Install a carbon monoxide detector in each accommodation space on your boat. Check the detectors periodically to be sure they are functioning properly.

WARNING! The Coast Guard has also issued a warning concerning a new trend called "teak surfing." This is the practice of holding on to the swim platform of a boat as it is moving - body-surfing on the wake of the boat. This is extremely dangerous because of the build-up of carbon monoxide at the rear of the boat, especially near the swim platform (not to mention the danger of the moving propeller!) A teak surfer can be overcome in seconds, pass out, and drown before anyone onboard the boat knows what is happening. The incidence of "teak surfing" related deaths is on the rise in 2003. The Coast Guard warns that only a few breaths of CO can cause a person to loose consciousness. So avoid this so-called "sport".

Also be aware of the risk of carbon monoxide poisoning to tubers and water skiers. Make sure the tow rope is long enough to keep tubers and skiers safe from the effects of CO gas build-up, and do not linger at the back of the boat.

Related U.S.C.G. articles:
- CO Hazards on Recreational Boats
- U.S.C.G. Recalls Houseboats Due to Carbon Monoxide
U.S. Department of the Interior SAFETY NET:
- List of related articles

June 1, 2003 - MarinaMate.com
Information provided by the U.S. Coast Guard Office of Boating Safety website.

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