Re: [PSUBS-MAILIST] Steel Pipe Hull

["Paul Kreemer" <paulkreemer@gmail.com>]

Øystein, I'm probably breathing too high a partial pressure of nitrogen, but shouldn't 30kPA be roughly a depth of 3m?  

thanks-
Paul



Pc (external pressure) = 30.6kPA = 30.6kPA / 100kPA/ATM  =  0.3 ATM 



Øystein wrote:

1ATM=100 000kPa =10m

Pc=30,6kPa
Pc = 300m depth

On 1/29/07, Øystein Skarholm < skarholm@gmail.com> wrote:

On 1/29/07, Øystein Skarholm < skarholm@gmail.com> wrote:
> Guys
>
> According to: Timoshenko, S, Theory of elastic Stability, a very rough
> calc gives me a crush depth for your cylinder will be:
>
> L=1524mm, Rm=250,825mm, T=6,35mm,
> k=4,167*10^-3, E=2,1*10^11Pa, m=R/T
>
> 1ATM=100 000Pa =10m
>
>
> Pc=0,87*E*k/m^(3/2)
>
> Pc=(0,87*2,1*10^11Pa*4,167*10^-3)/39,5^(3/2)
> Pc=30,6kPa
> Pc = 300m depth
>
> This is without regards for out of roundness.
>
>