Re: Calculation request

[MerlinSub@t-online.de (Carsten Standfuß)]

Carsten - from Germany

Hi Alec, thank you for the calculation. 
I did my calculation and get a destroy deep of
243 feet (74 m). The frames are 106 x 32 mm
flat plate frames. The bulkheads have only a thickness
of 12 mm, but they are not flat, they have a flat dome
design with a high of about 100 mm in the centerpoint. 

I want a destroy deep of 600 feet to dive 300 feet
so the vessel is not useful for me. 

regards, Carsten

Alec Smyth schrieb:
> 
> Carsten,
> 
> I ran your numbers, and got a predicted failure depth of 390 feet. However,
> I had to make big assumptions for lack of more complete data. For example, I
> assumed the material properties and I assumed the rings to be "bulkheads" --
> that is, very heavily over-dimensioned. The distance between stiffeners
> seems unusually large as it is almost equal to the hull diameter, and I
> would say this accounts for the poor depth rating.
> 
> Alec Smyth
> 
> -----Original Message-----
> From: owner-personal_submersibles@psubs.org
> [mailto:owner-personal_submersibles@psubs.org]On Behalf Of Carsten
> Standfuß
> Sent: Monday, November 29, 1999 4:41 PM
> To: Personal_Submersibles@psubs.org
> Subject: Calculation request
> 
> Carsten - from Germany
> 
> Hi friends, some of you use calculation
> progammes for pressure hulls.
> I use tables which are older.
> May some of you can cross check
> the dive deep ?
> 
> I can buy an older bigger Psub with the
> following dimension: (1 inch = 24,5mm)
> 
> Diameter outside = 2400 mm (98 inch)
> thickness hull   =   15 mm (0,61 inch)
> frame distants   = 2450 mm (100 inch)
> Steel : normal working steel, mild steel
> 
> any cross check welcome, regards Carsten.