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Re: [PSUBS-MAILIST] Request for pressure factors difference GL/ABS
Oh - thats a good question - and a simple answer -
For example in a submarine designed
for Pn = 30 ft
with Pz = 3,2 x 30 = 96 ft
with a sinking rate ("Houston - we have a problem")
of - for example - 33 ft/minute the crew (or Houston..)
has just (96-30)/33 = 2 minutes (searching for the drop weight key)
to make the right reaction from Pn to Pz before the sub collapse.
A simillar sister ship with a stronger hull
designed
for Pn = 300 ft
with Pz = 2,4 x 300 = 720 ft
and with the same sinking rate of 33 ft a minutes
the crew has (720-300)/33 = 12,7 minutes.
for Pn = = 3000 ft
with Pz = 1,73 x 3000 = 5190 ft
it figures out : (5190-3000)/33 = 66 Minutes
(building a new drop weight key..) reaction time !!
One reason I don't like subs designed for 5 feet
waterdeep.. 5 x 3,2 = 16 feet destroy deep.
with (16-5)/33 = 0,33 minutes = 20 seconds..
Conclusion I : The relative saftey factor is smaller within greater
deeps - but the absolut saftey distance is greater..
Another think : Most subs are designed to work near the bottom.
For a 10 ft sub near the bottom it is easy to find a deeper bottom
area of say 30 ft deep. For a 3000 ft sub near the bottom it is really
difficult to find a 5000 ft deep hole..
Conclusion II: The bottom is a really good dive stop automatic..
see you Carsten
Lew Clayman schrieb:
>
> --- Carsten Standfuß <MerlinSub@t-online.de> wrote:
> > I have here a table witch gives the factors you have to calculate
> > the pressure hull according to GL (Germanischer Lloyd) classification.
>
> Please help me understand. The "test" and "destroy" pressure seems to decrease as the depth
> increases. Why?
>
> <snip>
> > Pn Pp/Pn Pz/Pn
> > Workdive Test Destroy
> > pressure pressure pressure
> > (bar) S1 S2
> >
> > 05 (164 ft) 1,70 3,20
> > 10 (328 ft) 1,40 2,40
> <snip>
> > 50 (1640ft) 1,20 1,76
> > >60 (1968ft) 1,20 1,73
>
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