Hi all,
I've put some facts & figures
together re flooding a K250 at 200 ft.
Firstly, sorry I move between metric
& imperial. I was brought up on
imperial then N.Z. moved to metric.
The metric system is great for these
soughts of calculations.
The first assumption is that the
hull & hatch area displaces 1,100 liters.
The hatch 100 liters & the hull
1000 liters.
The flow figures through a 2" pipe
come from table 2 on this link. It was the best I could find.
These figures are approximations as
the flow rate changes all the time. Also I'm not
taking into account how many or how
fat the occupants are.
To fill to half way with the 2"
valve at 100 psi the water will be coming in at 384 gallons per minute.
It will fill the 550 liters (132
gallons) in about 20 seconds. The air in the hull will be compressed
to half its size & will be an
equivalent pressure (14.7 psi) as at 33 ft.
To fill the hull from 1/2 to 2/3 the
flow pressure will be between 85 psi & 70 psi. About 340 gpm.
The volume to be filled is 183
liters ( 48 gallons ).This will take 8 &1/2 seconds. In terms of
internal
pressure you have just gone from
14.7 to 29.2 psi wich is the same as diving from 33 ft to 66 ft in
8&1/2 seconds.
To fill the hull to 3/4 the pressure
will be from 70 to 55 psi about 300 gpm.
The volume to be filled is 92
liters ( 24 gallons ). This will take about 5 seconds. Again this is
equivalent to going down another 33
ft. to 99 ft.
Am being kicked off the computer for
the night so will leave it there.
But that is flooding so fast, I'd
want to have my hand on the valve as at that rate you'd blow
your ear drums for sure. It's best
to equalize your ears before they start feeling pain & in this
instance you can't reverse the
pressure like while diving, by ascending.
These figures are open for
correction.
Regards Alan