Hi,
First of all English is not my native language so apologies for any mistakes in advance.
I have been looking into the inert gas methods (exit bag, eebd, scuba & scba) on this forum for the past few days, and I want to summaries the pro and con of each method (based on what I understand) and see if anyone agrees, please share your thoughts and discuss which method is more reliable.
Exit bag:
Pros:
- parts can be gathered very easily
- cheapest and quite easy to setup
Cons:
- lots of uncertainties, bag could be blown off due to high pressure, the person could tear off the bag due to SI, slight movement after becoming unconscious could break the seal and let oxygen get inside the bag
- high failure rate for unknown reasons
Eebd hood:
Pros:
- much more sturdy than exit bag
- movement after becoming unconscious will unlikely interrupt the process
- cost more than making an exit bag but not as expensive as scuba and scba
Cons:
- the most well known yellow chinese eebd hood seems to have quality issues resulting in unsuccessful ctb
- some other hoods such as drager eebd hood don't have an exhaustion valve, so whether they are suitable for the inert gas method is still unknown
- quite difficult to set up as you need to extend and cramp the hose, and that might cause leaks
Scuba mask:
Pros:
- fairly easy to setup and source the parts
- tightly secured on your face so any movement after becoming unconscious will unlikely interrupt the process
- it uses 1st and 2nd stage regulator to control the flow, so gas will only flow in when the person inhale through the 2nd stage regulator, resulting in less gas usage and faster unconscious time
Cons:
- parts are very expensive
- it uses np (negative pressure) so the breathing resistance is higher, there are concerned about whether the weaker breath after becoming unconscious is enough to pop open the valve and keep the airflow (however, the breathing resistance of some 2nd stage regulators can be adjusted)
Scba mask:
Pros:
- Appears to be the most reliable method if you can obtain the parts
- it works similar to scuba but uses pp (positive pressure) instead, so the breathing resistance is very low, keeping airflow after becoming unconscious shouldn't be an issue
Cons:
- not much info regarding how to setup and source parts
- very difficult to source parts (I can only find pre-owned parts in the UK)
- also very expensive
I think scba will be too difficult to adapt for many of us, so out of the other 3 (exit bag, eebd & scuba), which one do you think is the most reliable method?
First of all English is not my native language so apologies for any mistakes in advance.
I have been looking into the inert gas methods (exit bag, eebd, scuba & scba) on this forum for the past few days, and I want to summaries the pro and con of each method (based on what I understand) and see if anyone agrees, please share your thoughts and discuss which method is more reliable.
Exit bag:
Pros:
- parts can be gathered very easily
- cheapest and quite easy to setup
Cons:
- lots of uncertainties, bag could be blown off due to high pressure, the person could tear off the bag due to SI, slight movement after becoming unconscious could break the seal and let oxygen get inside the bag
- high failure rate for unknown reasons
Eebd hood:
Pros:
- much more sturdy than exit bag
- movement after becoming unconscious will unlikely interrupt the process
- cost more than making an exit bag but not as expensive as scuba and scba
Cons:
- the most well known yellow chinese eebd hood seems to have quality issues resulting in unsuccessful ctb
- some other hoods such as drager eebd hood don't have an exhaustion valve, so whether they are suitable for the inert gas method is still unknown
- quite difficult to set up as you need to extend and cramp the hose, and that might cause leaks
Scuba mask:
Pros:
- fairly easy to setup and source the parts
- tightly secured on your face so any movement after becoming unconscious will unlikely interrupt the process
- it uses 1st and 2nd stage regulator to control the flow, so gas will only flow in when the person inhale through the 2nd stage regulator, resulting in less gas usage and faster unconscious time
Cons:
- parts are very expensive
- it uses np (negative pressure) so the breathing resistance is higher, there are concerned about whether the weaker breath after becoming unconscious is enough to pop open the valve and keep the airflow (however, the breathing resistance of some 2nd stage regulators can be adjusted)
Scba mask:
Pros:
- Appears to be the most reliable method if you can obtain the parts
- it works similar to scuba but uses pp (positive pressure) instead, so the breathing resistance is very low, keeping airflow after becoming unconscious shouldn't be an issue
Cons:
- not much info regarding how to setup and source parts
- very difficult to source parts (I can only find pre-owned parts in the UK)
- also very expensive
I think scba will be too difficult to adapt for many of us, so out of the other 3 (exit bag, eebd & scuba), which one do you think is the most reliable method?
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