Two additional tanks were loaded on the boat from the dock. A resort diver decided to join the diveboat at the last minute for a scheduled two tank dive. The diveboat was loaded with the new tanks. The tanks were placed aside, emptied, and then refilled with clean air. There is some speculation that a batch of tanks were CO contaminated (allegedly) recently at a resort during a fill by a faulty compressor. A low ppm range handheld ready-to-go-right-out-of-the box CO dectector for tank testing seems to be an elusive item, McGuyver rigging one together is the only option I've found thus far.I don't mind a build it yourself solution but I wish I could find a ready made system tailored to divers.-Do fill stations (resort or otherwise) routinely check for CO and measure ppm?Īs far as facts, within the rules of this Forum here are the facts that prompted my post and why I am going to purchase my own CO detector. This level is too high for breathing CO at high partial pressures. The home detectors are not set to display until 35 ppm is reached to prevent excessive calls to emergency services and gas companies. The levels of CO can get quite high as the exhaust due to the 'station wagon effect' is sucked back into aft cabin of boat even while underway.I have seen one fellow vomiting and headache from this CO source on boat. Most common reason for detector to alarm on dive boat has been excessive CO from rear exhaust on inboard gas engine charter boats. Just don't leave sensor in hot car otherwise it can be used to analyze air, nitrox, or hypoxic trimix. It was off by about 2 ppm which is a very stable sensor. I have used one for two years and had it recalibrated once. If CO < 10 ppm it will show amount down to 1 ppm only if test button is pushed. If CO is > 10 ppm the display will light automatically and beep. Hold the white cap over the inlet of detector for 1.5 to 2 minutes to displace ambient air and fill chamber with tank air. You will need a BCD flow restrictor as the 4th item here for $30. Thanks in advance for your thoughtful replys. Now, without flaming or naming.let's all learn something from one another and discuss CO poisoning. Does anyone manufacture a combination Nitrox/CO analyzer/detector? What is the best method for a diver to self test his tanks for CO? Do fill stations (resort or otherwise) routinely check for CO and measure ppm? If so what's the time frame for detection? Are the symptoms of CO poisoning detectable by a diver in time to surface/abort the dive? ![]() In light of recent Roatan reports of 2 diver deaths on the same dive from "bad air" who were diving with a top dive resorts operation, I have been searching for answers to a few questions and would like to take every reasonable step to protect myself from a similar mistake. The maximal allowable level is 20 ppm (0.002%)" Prevention requires periodic air sampling. In addition to the effect on the hemoglobin molecule, it has a toxic effect on the cytochrome A3 system. Retinal venous engorgement (as seen through an ophthalmoscope)Ĭarbon monoxide in diving is the product of incomplete combustion of hydrocarbons and is usually from compressors and cigarette smoking. Little association with COHgb (carboxy hemoglobin) About 14% of patients sustain permanent brain damage, and delayed neurological sequelae do occur 3-21 days later in about 12% of people.Īn interval of unconsciousness (longer the higher the risk) ![]() The most commonly observed result related to CO poisoning is neurological dysfunction abnormalities in the cardiac, pulmonary and renal organ systems do occur. CO poisoning is the leading cause of poisoning deaths in the U.S.(about 8600 deaths per year) and is easily missed unless health care providers are especially vigilant. "Carbon Monoxide poisoning is a rare cause of problems when diving, it does occur when there is contaminated air in recreational diving tanks. It is my hope that this thread will remain constructive, instructional and maybe even save a life by discussing the danger of Carbon Monoxide (CO) and what can be done to prevent and detect it. Other threads that have attempted to discuss this accident have been locked/edited/or deleted because of posters not following the rules. (3) No flaming, name calling or otherwise attacking other posters.etc. (2) No "blamestorming." Accident analysis does not "find fault" - it finds hazards - and how to reduce or eliminate them. You may refer to articles or news releases already in the public domain, but the only name you may use in this forum is your own. Please.Remind yourself of the rules before you add to the thread. Within the rules and purpose of this forum -" the promotion of safe diving through accident analysis.Īccurate analysis of accidents and incidents that could easily have become accidents is essential to building lessons learned from which improved safety can flow."
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