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Q1 - Part of Dive Planning

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Q1 - Part of Dive Planning

Post Number:#1  Postby GOD » Sun Apr 29, 2007 9:14 pm

A diver is to carry out a dive to 38 meters.

What is his expected time at depth of his 11 liter cylinder if it is charge to 200 bars?

Consumtion at surface = [highlight]15 liter/min[/highlight]


Instructor's, DM's, Diver's & Moderator's are allowed to ANSWER the question.

Don't be shy now... COME ON!!!!!!!!

;D
GOD
 
Topic author

Re: Q1 - Part of Dive Planning

Post Number:#2  Postby SeaDemon » Mon Apr 30, 2007 12:07 am

This sounds like a trick question  ;D ;D ;D ;D ;D

From 200 Bars to 0 Bar, he can stay for 30 minutes plus minus a few seconds.

However, he is only allowed an NDL of about 11 minutes. So that is his maximum time at depth without going into deco. ::)
SeaDemon
 
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Re: Q1 - Part of Dive Planning

Post Number:#3  Postby GOD » Mon Apr 30, 2007 12:17 am

This sounds like a trick question  ;D ;D ;D ;D ;D

From 200 Bars to 0 Bar, he can stay for 30 minutes plus minus a few seconds.

However, he is only allowed an NDL of about 11 minutes. So that is his maximum time at depth without going into deco. ::)


Hehehehehehe..... Try Again.

I wonder where are the other Instructor's & DM's ... where are the rest of the divers???


;D
GOD
 
Topic author

Re: Q1 - Part of Dive Planning

Post Number:#4  Postby SeaDemon » Mon Apr 30, 2007 12:29 am

Is the diver diving single cylinder OC or twins, and recreational or tech, and must calculate rock bottom gas or not?
SeaDemon
 
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Re: Q1 - Part of Dive Planning

Post Number:#5  Postby GOD » Mon Apr 30, 2007 12:40 am

Is the diver diving single cylinder OC or twins, and recreational or tech, and must calculate rock bottom gas or not?


Single Cylinder... how many minutes of AIR does he have at 38 meter.

This Q1 are very important for divers that do deep diving...recreational & technical.

;D

Make Life Easier for you lots ..... hahahahahahahaa

1. Calculate Diver gas consumption

2. [highlight]Free Gas Volume of gas available[/highlight] - Tricky Bit.....Instructor's? DM's ...Tekkie's...COME ON!!!!

3. Time the diver takes to breath this gas
Last edited by GOD on Mon Apr 30, 2007 12:51 am, edited 1 time in total.
GOD
 
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Re: Q1 - Part of Dive Planning

Post Number:#6  Postby superkingkong » Mon Apr 30, 2007 1:25 am

about 36min?  ;D
superkingkong
 
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Re: Q1 - Part of Dive Planning

Post Number:#7  Postby SeaDemon » Mon Apr 30, 2007 6:14 am

Single OC dive...it will take him around 2 minutes to get down to 38 meters. His PPO2 at that depth would be 1.01. If this guy is diving alone, his total air volume taken from surface to 4.8ATA would give him 30.5 minutes for him to use from 200 BAR down to empty.  Using the Rule of Thirds, including travel time, his turn around time should be 10 minutes into the run time. That is just one minute before reaching his NDL.

If he was diving with a buddy and that is the worst SAC rate, then his turn around time should be at a run time of 5 minutes. So if it took him and his buddy 2 minutes to get down there, they have a further 3 minutes before they have to ascend to a different level.
SeaDemon
 
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Re: Q1 - Part of Dive Planning

Post Number:#8  Postby superkingkong » Mon Apr 30, 2007 6:45 am

oh ...ya hor.. i divided using 4ata onli ::)  :P

so, it's 30.5min correcto?
superkingkong
 
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Re: Q1 - Part of Dive Planning

Post Number:#9  Postby GOD » Mon Apr 30, 2007 12:26 pm

SD .. is getting closer, the calculations are correct in a way BUT you forgot about the EQUIPMENT.

Heheheheheheeee.... Try Again.

Hint : Regulator do have Intermediate pressure, say 10 Bar ....... depth in ATA, so must combine this to get the correct answer.

SKK ... keep trying bro

;D
GOD
 
Topic author

Re: Q1 - Part of Dive Planning

Post Number:#10  Postby SeaDemon » Mon Apr 30, 2007 3:11 pm

Oh yeah...hehehe...usually has about 140-145 psi (9.5 to 9.997 BAR at surface level). So, say 10 BAR...at 4.8ATA..I'll have another 2 BAR plus minus..about 22 liters of air or another minute.  Haha...I'm just writing this and doing mental calculation here so I am confused. ;D
SeaDemon
 
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Re: Q1 - Part of Dive Planning

Post Number:#11  Postby GOD » Mon Apr 30, 2007 6:17 pm

Oh yeah...hehehe...usually has about 140-145 psi (9.5 to 9.997 BAR at surface level). So, say 10 BAR...at 4.8ATA..I'll have another 2 BAR plus minus..about 22 liters of air or another minute.  Haha...I'm just writing this and doing mental calculation here so I am confused. ;D


You are getting there ... 200bar - (10bar + 4.8ATA) = ........  :D

Please Continue ...  ;)  ;)  ;)

;D
GOD
 
Topic author

Re: Q1 - Part of Dive Planning

Post Number:#12  Postby leafbug » Mon Apr 30, 2007 8:55 pm

each time you guys posted this kinda Fuy-yoh! questions, it makes me wonder whether it's wise for me to keep on relying on my divecomp like I always do :) so, with my rusty memory on dive planning, I'd say that :

(I'm not good enough to calculate the exact minute but my rough calculation for planning as in to stay alive)

from the 15L/min at surface, the consumption at 38m (4.8ATA) is 72.86L/min, which with 11L cylinder, it'll leave me with (11x200/72.86) to get 30.1min complete bottom time until the tank is flat empty. but this is too flat of a calculation not including the air used for descending/ascending+SS.

ok... on what I thought as a more realistic approached in this situation, I'd prefer to just calc the 11x150/72.86 and getting 22.6min to breath at 38m before it's time to use the remaining 50bar for ascending.

am I right or dead wrong? :)
Last edited by leafbug on Mon Apr 30, 2007 8:57 pm, edited 1 time in total.
leafbug
 
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Re: Q1 - Part of Dive Planning

Post Number:#13  Postby GOD » Sun May 06, 2007 2:18 am

each time you guys posted this kinda Fuy-yoh! questions, it makes me wonder whether it's wise for me to keep on relying on my divecomp like I always do :) so, with my rusty memory on dive planning, I'd say that :

(I'm not good enough to calculate the exact minute but my rough calculation for planning as in to stay alive)

from the 15L/min at surface, the consumption at 38m (4.8ATA) is 72.86L/min, which with 11L cylinder, it'll leave me with (11x200/72.86) to get 30.1min complete bottom time until the tank is flat empty. but this is too flat of a calculation not including the air used for descending/ascending+SS.

ok... on what I thought as a more realistic approached in this situation, I'd prefer to just calc the 11x150/72.86 and getting 22.6min to breath at 38m before it's time to use the remaining 50bar for ascending.

am I right or dead wrong? :)


Keep trying ... dont bother with ascending or descending.

Dont forget the IP on the first stage .... what is left from the Cylinder is the one that U calculate.

;D
GOD
 
Topic author

Re: Q1 - Part of Dive Planning

Post Number:#14  Postby superkingkong » Sun May 06, 2007 2:54 am

pardon me for my ignorance... but what is IP ah? .. reading it everywhere.. but don't know who to ask :P
superkingkong
 
Topic author

Re: Q1 - Part of Dive Planning

Post Number:#15  Postby GOD » Sun May 06, 2007 1:10 pm

pardon me for my ignorance... but what is IP ah? .. reading it everywhere.. but don't know who to ask :P


IP = Intermediate Pressure

;D
GOD
 
Topic author

Re: Q1 - Part of Dive Planning

Post Number:#16  Postby bobo » Sun May 06, 2007 7:19 pm

hahaha.. land narcosis, i'm confused...
bobo
 
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Re: Q1 - Part of Dive Planning

Post Number:#17  Postby mephisto » Sun May 06, 2007 7:20 pm

A diver is to carry out a dive to 38 meters.

What is his expected time at depth of his 11 liter cylinder if it is charge to 200 bars?

Consumtion at surface = [highlight]15 liter/min[/highlight]


Instructor's, DM's, Diver's & Moderator's are allowed to ANSWER the question.

Don't be shy now... COME ON!!!!!!!!

;D



Absolute pressure: 38/10 + 1 : 4.8 bar

Gas available: (200 X 11) - (10+4.8) regulator drive: 2185.2 liters

time available: 2185.2/ (4.8 X 15): 30 minutes 21 seconds...........
mephisto
 
Topic author

Re: Q1 - Part of Dive Planning

Post Number:#18  Postby GOD » Sun May 06, 2007 8:02 pm

Absolute pressure: 38/10 + 1 : 4.8 bar

[highlight]Gas available: (200 X 11) - (10+4.8) regulator drive: 2185.2 liters[/highlight]

time available: 2185.2/ (4.8 X 15): 30 minutes 21 seconds...........


(Cylinder Pressure in Bar) - (10bar + 4.8ATA)

Getting there ..... hehehehehehe

;D
GOD
 
Topic author

Re: Q1 - Part of Dive Planning

Post Number:#19  Postby superkingkong » Mon May 07, 2007 6:22 am

pardon me for my ignorance... but what is IP ah? .. reading it everywhere.. but don't know who to ask :P


IP = Intermediate Pressure

;D


thanks for letting me know :)
superkingkong
 
Topic author

Re: Q1 - Part of Dive Planning

Post Number:#20  Postby bobo » Tue May 08, 2007 1:43 am

so whats the answer, break down the calculation la snaf
bobo
 
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Re: Q1 - Part of Dive Planning

Post Number:#21  Postby GOD » Tue May 08, 2007 2:51 am

so whats the answer, break down the calculation la snaf


Bro ... I have not done the calculation yet, my calculator using solar power ... at night not working.

;D
GOD
 
Topic author

Re: Q1 - Part of Dive Planning

Post Number:#22  Postby mephisto » Tue May 08, 2007 7:34 pm

Absolute pressure: 38/10 + 1 : 4.8 bar

[highlight]Gas available: (200 X 11) - (10+4.8) regulator drive: 2185.2 liters[/highlight]

time available: 2185.2/ (4.8 X 15): 30 minutes 21 seconds...........


(Cylinder Pressure in Bar) - (10bar + 4.8ATA)

Getting there ..... hehehehehehe

;D


Sorry beb.

As follows:

Absolute pressure: 38/10 + 1 : 4.8 bar

Gas available: [200 - (10+4.8) regulator drive] 11  : 2037.2 liters
time available: 2037.2 / (4.8 X 15): 28 minutes 17 seconds...
mephisto
 
Topic author

Re: Q1 - Part of Dive Planning

Post Number:#23  Postby GOD » Tue May 08, 2007 7:37 pm

A diver is to carry out a dive to 38 meters.

What is his expected time at depth of his 11 liter cylinder if it is charge to 200 bars?

Consumtion at surface = [highlight]15 liter/min[/highlight]


38m = 4.8 ata

1st stage IP = 10 bar

[highlight]200bar - (10bar + 4.8 ata) = 185.2 Bar [/highlight]

185.2 Bar x 11L =[highlight] 2037.2 Liter of Free Gas Volume[/highlight]

RMV 15 L/min x 4.8 ata = 72 L/min at 38m

2037.2/72 =[highlight] 28 minutes at 38m[/highlight]


Q2: Who Can Hold their breath for 2-3 minutes??


;D
GOD
 
Topic author

Re: Q1 - Part of Dive Planning

Post Number:#24  Postby GOD » Tue May 08, 2007 7:45 pm

Sorry beb.

As follows:

Absolute pressure: 38/10 + 1 : 4.8 bar

Gas available: [200 - (10+4.8) regulator drive] 11  : 2037.2 liters
time available: 2037.2 / (4.8 X 15): 28 minutes 17 seconds...


HooooOoooray!!!!!!!!!!!

Correct answer!!!!!!!!

So do look into your diving equipment spec. especially if you planning to do deep diving ... not just doing AOWD deep dive.

KNOW YOUR EQUIPMENT ....Plan & plan ....be safe!

Instructors ... DMs ....can teach you what is shown in their Manual, but it can be wrong for deep diving .... accident waiting to happen.

BTW... that is why as you go shallower, you will have some air to breath from your regulator.

;D
GOD
 
Topic author

Re: Q1 - Part of Dive Planning

Post Number:#25  Postby bobo » Tue May 08, 2007 8:40 pm

ler, respiratory minute volume is surface consumption rate, patut sampai sudah aku tak dapat cari ceh... hehe (its only reason i can think of  ;D)
bobo
 
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Re: Q1 - Part of Dive Planning

Post Number:#26  Postby GOD » Tue May 08, 2007 11:48 pm

ler, respiratory minute volume is surface consumption rate, patut sampai sudah aku tak dapat cari ceh... hehe (its only reason i can think of  ;D)


Hehehehehe ... dodgy!!!!

;D
GOD
 
Topic author

Re: Q1 - Part of Dive Planning

Post Number:#27  Postby bobo » Wed May 09, 2007 1:16 am

hehe, thats why i dont do deep dive, shallower the better hahahaha... easy...
bobo
 
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