I was merely answering Extemp.ís question.
I believe that the NNMA currently requires a CO detector in accommodation spaces for certified boats.
Exhaust system leaks
, the leading cause of death by carbon monoxide on boats, can allow carbon monoxide to migrate throughout the boat and into enclosed accommodation areas. Regularly inspect* your exhaust system and ensure that all exhaust hose clamps are doubled and secure. If you see water
staining on your manifold it means that gases as well as water are leaking. Repair it immediately (a well tuned engine produces less CO than a poorly maintained engine).
* Replace exhaust hoses if any evidence of cracking, charring or deterioration is found.
* Inspect each water pump impeller and the water pump housing, and replace if worn. Make sure cooling
systems are in proper working condition to prevent overheating
and burn through the exhaust system. (Refer to the engine and generator manuals
for further information.)
* Inspect each of the metallic exhaust components for cracking, rusting, leaking or loosening. Pay particular attention to the cylinder head
, exhaust manifold, water injection elbow
, and the threaded adapter nipple between the manifold and the elbow.
* Clean, inspect, and confirm proper operation of the cooling
water">engine cooling water anti-siphon valve (if equipped).
Other CO poisoning etiologies:
It has been generally assumed that CO poisoning was not possible outdoors, however one recent fatality was that of a man working in the cockpit
of his sail boat, with a small generator running on the dock
. The CO drifted down into the cockpit and killed him.
Blockage of exhaust outlets can cause carbon monoxide to accumulate in the cabin
and cockpit area - even when hatches, windows, portholes, and doors are closed.
Exhaust from another vessel that is docked, beached, or anchored alongside your boat can emit poisonous carbon monoxide gas into the cabin
and cockpit of your boat. Even with properly vented exhaust, your boat should be a minimum of 20 feet from the nearest boat that is running a generator or engine.
Slow speeds, or idling, can cause carbon monoxide gas to accumulate in the cabin, cockpit, or even in an open area. A tailwind (force of wind
entering from aft section of the boat) can also increase accumulation.
The "station wagon effect," or backdrafting can cause carbon monoxide to accumulate inside the cabin or cockpit when operating the boat trimmed at a high bow angle, with improper or heavy loading, or if there is an opening which draws in exhaust. This effect can also cause carbon monoxide to accumulate inside the cabin, cockpit, aft deck
, and bridge on power boats, when protective coverings are used and the boat is underway.
CO Exposure Limits
35 ppm - Maximum allowed by EPA outside for 1 hour
200 ppm - Noticeable symptoms
800 ppm - Serious symptoms and even death
1200 ppm - Immediately dangerous to life and health
6400 ppm - DEATH in 10 minutes
I believe defjef is an Architect., whereas I worked for an Engineering firm.
The following dramatization might illuminate our differing points of view.
A Few Good Architects at AMNP