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Topic Review (Newest First)
03-25-2014 02:15 AM
Darkblade48
Quote:
Originally Posted by Ryan, Monroe, LA View Post
One of the 48 Hours/Dateline/20/20 news shows had a mystery segment a few years back about a couple's death in a dorm room. When they finally solved the case, it turned out to be CO2 (not CO) poisoning.
There was an episode of CSI: Las Vegas that had a similar plot.

Quote:
Originally Posted by Ryan, Monroe, LA View Post
When it comes to CO2, the danger is not (just) displacing oxygen, which was somewhat of a surprise to me when I learned that fact. CO2 can bind with hemoglobin preferentially (over oxygen) in much the same way CO poisoning happens, abeit at higher concentrations.
Hemoglobin will bind CO2 preferentially over O2, but it depends on several factors (form of the hemoglobin, CO2 and O2 concentrations, pH). That's how CO2 is removed from tissues

Quote:
Originally Posted by Ryan, Monroe, LA View Post
It is interesting and important to note, however, that amongst the truly non-poisonous gasses, nitrogen holds a unique and hidden danger. It has a long history of causing fatalities in industry because the human brain cannot detect a difference between breathing air (78% nitrogen) and higher concentrations of nitrogen.
This is true of any inert gas.

Quote:
Originally Posted by Ryan, Monroe, LA View Post
When you breath other non-poisonous gas mixures that are low in oxygen, such as exhaled air (high in CO2) or helium, your brain can tell what is being breathed deficient in oxygen. Your brain perceives pure nitrogen as it would well-oxigenated air, leading to sudden asphyxiation and death with almost no forewarning.
No; these are two separate things.

If you are breathing in gas mixtures that are low in oxygen, but also low in CO2 (an inert gas, such as nitrogen, helium, argon, etc), you can still asphyxiate because of the lack of oxygen. The body is unable to feel any pain because CO2 is still being eliminated as normal.

However, if you are breathing the same inert gas, but with CO2, then your body will be sense that you are not getting enough oxygen.

In short, feelings of asphyxiation are due to the buildup of CO2 in the bloodstream.
03-24-2014 09:14 PM
Ryan, Monroe, LA One of the 48 Hours/Dateline/20/20 news shows had a mystery segment a few years back about a couple's death in a dorm room. When they finally solved the case, it turned out to be CO2 (not CO) poisoning. I can't remember the exact details of the prank, but it involved the next door neighbors shooting something CO2-laden through a hole in the wall. I don't think it was a fire extinguisher... may have been dry ice, but then again I don't know how you'd shoot that through a hole in the wall.

There have been other CO2-related asphyxiations in the news over the years as well, so don't think this cannot happen even with 5 or 10 lb cylinders in a non-hermaticaly sealed room. When it comes to CO2, the danger is not (just) displacing oxygen, which was somewhat of a surprise to me when I learned that fact. CO2 can bind with hemoglobin preferentially (over oxygen) in much the same way CO poisoning happens, abeit at higher concentrations.

Truly non-poisonous gases like nitrogen, helium and argon on the other hand will not bond at all with hemoglobin and only become dangerous when they displace too much O2 to support life. It is interesting and important to note, however, that amongst the truly non-poisonous gasses, nitrogen holds a unique and hidden danger. It has a long history of causing fatalities in industry because the human brain cannot detect a difference between breathing air (78% nitrogen) and higher concentrations of nitrogen. When you breath other non-poisonous gas mixures that are low in oxygen, such as exhaled air (high in CO2) or helium, your brain can tell what is being breathed deficient in oxygen. Your brain perceives pure nitrogen as it would well-oxigenated air, leading to sudden asphyxiation and death with almost no forewarning.
11-13-2012 07:54 PM
PlantedRich Sure, the CO2 can put the water heater pilot out if it is thick enough. The point is that it really is no big deal when the pilot goes out. This whole thread is built on passing on information to make people panic!
There are folks whose main job is designing safety features and making sure consumers are safe when they use equipment. A water heater is designed to avoid gas leaking and blowing up the house. People can screw things up but they have to work at it to blow the house up. The same things apply to using CO2. In this country, if it doesn't have big tags warning you of the hazard, it is likely there is no hazard there.
It is worth noting that there are no warnings on CO2 and there are millions of CO2 tanks used all over for all sorts of work.
Even kids who are not allowed to buy model glue are allowed to buy CO2!
11-13-2012 03:32 AM
Steve001
Quote:
Originally Posted by PlantedRich View Post
This is another example of alarming news from people who lack training/understanding of the equipment.
If the pilot light goes out for any reason, the thermocouple cools and the gas supply is cut off. Your house does NOT blow up but you will find a cold shower.
Well mister smarty pants we all can't be up on the latest workings of water heaters. It did happen.
11-13-2012 02:41 AM
PlantedRich Anybody who responds to Nigerian e-mails goes on my suspect list!

I read last night that the Bay bridge is for sale. If you send me $20 I will send you the information Priority Mail. Sooner to respond quick as deal is not open to folks many.
11-13-2012 02:08 AM
Bettatail
Quote:
Originally Posted by PlantedRich View Post
Quote: I don't know anything about the site contains any "doomed globe",

The DOOMED GLOBE is the start of the URL you posted. If you did not question WHERE you read the information you posted, how can you possibly have given it any critical thought before passing it on as truth?

If you don't question what you are reading on the internet, there may really be a danger of you hurting yourself with CO2! Shissh! Are you still expecting to get that money from Nigeria?
so forget about that page from doomed globe, google the "co2 concentration safety" and pick the links other than "doomed globe", and read.

Nigeria scam is fun, I used to respond to those emails back in 2005, just tried to make them work harder to get me on hook, then block or report their emails.
put aside the Nigeria scam, I am not really sure the link that I provided has anything directly relate to Nigeria scam or any misleading instruction on how to properly handle co2, it is about the co2 concentration safety anyway. And I don't think I will be in a danger of hurting myself with co2.
11-13-2012 12:43 AM
PlantedRich Quote: I don't know anything about the site contains any "doomed globe",

The DOOMED GLOBE is the start of the URL you posted. If you did not question WHERE you read the information you posted, how can you possibly have given it any critical thought before passing it on as truth?

If you don't question what you are reading on the internet, there may really be a danger of you hurting yourself with CO2! Shissh! Are you still expecting to get that money from Nigeria?
11-13-2012 12:35 AM
Mostro
Quote:
Originally Posted by Steve001 View Post
If you smell something bad at night don't flip on any light switches.
This is profound, time-honored advice for any number of situations.
11-13-2012 12:33 AM
PlantedRich
Quote:
Originally Posted by Steve001 View Post
There is a real caution that should be made aware but not alarming. Especially if you keep your house closed up in winter and summer. It concerns the pilot light in the water heater. If there's a high enough co2 gas leak and if the co2 has nowhere to vent to the outside it will pool in your basement. With enough co2 in your basement the pilot light can be snuffed out creating a gas leak. So, If you smell something bad and you've been tinkering with the co2 tank, don't blame the dog, go check the waterheater pilot light. And if you smell something bad at night don't flip on any light switches.

I once vented a nearly empty co2 tank in my living room and did snuff out the pilot light.

This is another example of alarming news from people who lack training/understanding of the equipment.
If the pilot light goes out for any reason, the thermocouple cools and the gas supply is cut off. Your house does NOT blow up but you will find a cold shower.
11-12-2012 08:44 PM
jan db good advice
11-12-2012 08:07 PM
Bettatail
Quote:
Originally Posted by ua hua View Post
Is it being anti-social and not obeying commands? Those are classic symptoms of co2 toxicity. Oh no wait.. those are symptoms of a cat.
11-12-2012 08:05 PM
Bettatail It is the dose that kill, any substance can be toxic if give the proper amount
11-12-2012 07:54 PM
Bettatail hey, guys, I never said co2 is toxic gas, and never treat it like toxic gas...
so don't expect me to put on my gas mask or thinking that I wanted you to put on your gas mask, when playing with co2 equipment.

build some good number systems, and play with co2 tank all the time, never worry co2 would hurt me because co2 is not toxic gas.

The safety concern of CO2 is its concentration in air.
no matter how much and how you use it, if you stay in the environment where the co2 concentration is less than the point that cause trouble, it should be fine.


Quote:
Originally Posted by PlantedRich View Post
So what we have is a warning about a hazard that doesn't exist in normal use, based on information from an internet article whose URL includes "doomed globe" written by somebody who is likely a nut?
Isn't the internet a place to get some wonderful information to pass around to anyone would needs another worry? ?

If I ever hear of a planted tank fan being struck down by his CO2, then I might worry. But NOT if the info comes from the internet!
I don't know anything about the site contains any "doomed globe", but the page about the co2 concentration safety make no much difference if you google "co2 concentration safety", other websites will pop up and you will see pretty much the same description about co2 concentration safety, some are hard to read because too technical.
11-12-2012 05:35 PM
ua hua
Quote:
Originally Posted by nvladik View Post
This thread might explain my cat's behavior last few days.
Is it being anti-social and not obeying commands? Those are classic symptoms of co2 toxicity. Oh no wait.. those are symptoms of a cat.
11-12-2012 05:27 PM
nvladik This thread might explain my cat's behavior last few days.
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