Ok I have a couple of questions. I am new to any scuba or breathing assisted type activities and I have a project that I am doing that I would like to verify some things and learn on others. My main questions are:
1. Mathematical calculation verification
2. Regulator Information
First, I would like to clarify a few things before presenting the design of the project. This project is only intended to give a set number of breaths to allow me to search a river bottom that averages 5 feet with one section that goes maybe 12-20 feet max. This is not intended to be a scuba tank in any way, just a device to give me a set number of breaths. Ok with that out of the way, now I can lay out the design. The "tank" will be made out of 2" pvc and have a total length (tentitively) of 74". Using elbows and tees I will have 3 sections @ 18" long and 2 @ 10", which will form a square with a post in the middle. There will be a filter at the the discharge port which the regulator will be hooked to. Filter medium will be a 13X dessicant sieve followed by activated charcoal. Tank will be filled to a maximum of 100 psi and more likely 80 psi (mathematical equations that follow will show 80 psi) for safety. Tank will be filled with a standard t handle bike pump (possibly with the same type of filter attached). Regulator will be a cheap $22 hooka regulator from amazon (to be posted below). All pipe will be covered with closed cell foam for additional impact resistance. Now for the first question. I want to make sure my air calculations are correct and that I am not missing anything.
Interior volume of tank: 3.81 liters
My calculation from the tank calculations on this site:
3.81L x. 03666 x 80psi / 14.7 = 0.7601339 ft³
Average human breath: .5 liters
5L = 0.0176573333607 ft³
0.7601339 ft³ / 0.0176573333607 ft³= 43.0491901. So my estimated amount of breaths I can take from this would be 43. This again is just an estimate. Are there any errors or additions to my calculations I may have missed? Now for the regulator. Here is the regulator I am thinking of getting for this: https://www.amazon.com/dp/B01AL6U
N22/ref=asc_df_B01AL6UN225247010/?tag=hyprod-20&creative=395033&creativeASIN=B01AL6UN22&linkCode=df0&hvadid=167139952559&hvpos=1o1&hvnetw=g&hvrand=7890581859452685895&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9029671&hvtargid=pla-311901231993.
It says a maximum of 145 psi, so I am assuming that I would have to adjust it down to 80 psi? Or will I not have to adjust it at all? Is there any danger of not adjusting it? Also, can someone explain how the regulator of this type takes the pressure down to a non dangerous level for breathing? It's hard for me to word this question correctly, but basically when breathing from a tank what psi of air is too much to try and breath in in one breath and how does the regulator prevent to high of a pressure from being inhaled? Just trying to get educated. I don't need to have this project done until next summer so I wish to learn as much as possible. Thanks and looking forward to talking with everybody.
1. Mathematical calculation verification
2. Regulator Information
First, I would like to clarify a few things before presenting the design of the project. This project is only intended to give a set number of breaths to allow me to search a river bottom that averages 5 feet with one section that goes maybe 12-20 feet max. This is not intended to be a scuba tank in any way, just a device to give me a set number of breaths. Ok with that out of the way, now I can lay out the design. The "tank" will be made out of 2" pvc and have a total length (tentitively) of 74". Using elbows and tees I will have 3 sections @ 18" long and 2 @ 10", which will form a square with a post in the middle. There will be a filter at the the discharge port which the regulator will be hooked to. Filter medium will be a 13X dessicant sieve followed by activated charcoal. Tank will be filled to a maximum of 100 psi and more likely 80 psi (mathematical equations that follow will show 80 psi) for safety. Tank will be filled with a standard t handle bike pump (possibly with the same type of filter attached). Regulator will be a cheap $22 hooka regulator from amazon (to be posted below). All pipe will be covered with closed cell foam for additional impact resistance. Now for the first question. I want to make sure my air calculations are correct and that I am not missing anything.
Interior volume of tank: 3.81 liters
My calculation from the tank calculations on this site:
3.81L x. 03666 x 80psi / 14.7 = 0.7601339 ft³
Average human breath: .5 liters
5L = 0.0176573333607 ft³
0.7601339 ft³ / 0.0176573333607 ft³= 43.0491901. So my estimated amount of breaths I can take from this would be 43. This again is just an estimate. Are there any errors or additions to my calculations I may have missed? Now for the regulator. Here is the regulator I am thinking of getting for this: https://www.amazon.com/dp/B01AL6U
N22/ref=asc_df_B01AL6UN225247010/?tag=hyprod-20&creative=395033&creativeASIN=B01AL6UN22&linkCode=df0&hvadid=167139952559&hvpos=1o1&hvnetw=g&hvrand=7890581859452685895&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9029671&hvtargid=pla-311901231993.
It says a maximum of 145 psi, so I am assuming that I would have to adjust it down to 80 psi? Or will I not have to adjust it at all? Is there any danger of not adjusting it? Also, can someone explain how the regulator of this type takes the pressure down to a non dangerous level for breathing? It's hard for me to word this question correctly, but basically when breathing from a tank what psi of air is too much to try and breath in in one breath and how does the regulator prevent to high of a pressure from being inhaled? Just trying to get educated. I don't need to have this project done until next summer so I wish to learn as much as possible. Thanks and looking forward to talking with everybody.