viperdoc(at)mindspring.co
Guest
|
 Posted: Fri Dec 11, 2009 8:35 am Post subject: [Norton AntiSpam] Re: Ever wonder what it really looks |
 |
|
Gill,
For a your healthy 20-30 year old CO exposure at these levels of short term
exposure are not real health problems. I will give the direct passage from
the textbook concerning CO exposure concerning workers. The military's'
standard does not significantly differ from what is here stated. The
following is from Occupational Medicine 3rd edition, Carl Zenz, pp. 445:
PERMISSIBLE THRESHOLD VALUES FOR CARBON MONOXIDE
A summary of the recommendations of the National Institute for Occupational
Safety and Health (NIOSH) is as follows:
Employees are to be protected against acute carbon monoxide poisoning and
deleterious myocardial alterations associated with levels of
carboxyhemoglobin in excess of 5%. They are also to be provided protection
from adverse behavioral manifestations resulting from exposure to low levels
of carbon monoxide.
The recommended standard is designed to protect the safety and health of
workers who are performing a normal 8-hour, 40 hour week assignment. It was
not designed for the population at large, and any extrapolation beyond the
general worker population is unwarranted. Because of the well-defined
smoking and a common exposure to carbon monoxide and inhaled smoke, the
recommended standard may not provide the same degree of protection to those
workers who smoke as it will to none-smokers. Likewise, under the conditions
of reduced ambient oxygen concentration, such as would be encountered by
workers at very high altitudes (e.g. 5000 to 8000 feet above sea level), the
permissible exposure stated in the recommended standard should be lowered
appropriately to compensate for loss in the oxygen-carrying capacity of the
blood. In addition, workers with physical impairments will not be provide
the same degree of protection as the general worker population. It is
anticipated that the criteria and standard recommendation in the document
will be reviewed and revised as necessary.
CONCENTRATION
Occupational exposure to carbon monoxide shall be controlled so that no
worker shall be exposed to a concentration greater that 35 ppm, as
determined by a time-weighted reading, hopcalite-type carbon monoxide meter,
calibrated against a known concentrations of carbon monoxide, or by a gas
detector tube units certified under Title 42 of the Code of Regulations,
Part 34.
No level of carbon monoxide to which workers are exposed shall exceed a
ceiling concentration of 200 ppms.
These are the same standards that are applied the occupational medicine
sections of the Aerospace Medicine departments in both of my Wings.
Now saying all of this, none of it applies to what we are doing in the CJ or
YAK communities because these are hobbies for most part not an occupation.
The fact is there is a risk that exists in the community. How that
information is used individually is up to each of us in our own aircraft.
Me personally, I know how I as an old fart feel after a day of flying with
personal exposure in my aircraft up to 50 to 100 ppm with engine run-up to
TO and savaging for shut down. I personally am more fatigued when I do not
use a fresh air source and a mask than when I do. To date, I am still
passing my Flying Class II AF and FAA physicals along getting a good bill
of health from my internist. I have not done an arterial blood gas on myself
after a sortie to see what my % carboxyhemoglobin levels are. I do not plan
on doing that either unless there is a problem. I can tell you those suckers
hurt! An arterial blood gas is the only way to determine %
carboxyhemoglobin.
Do with this information as you please. This is a hobby. It will only become
a problem when there is an accident related to CO. Some aircraft are going
to have higher emissions than others. You have to determine your own
personal safety/comfort level. I am not comfortable with the levels that I
am exposed to when I fly so I try to mitigate that exposure by wearing an O2
mask with a fresh air source.
Doc Kemp
--
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
|
|
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
