[PSUBS-MAILIST] 1-ATM design

[Jim via Personal_Submersibles]

Hello Peter,
Welcome to the group.  Could you add a column containing the appropriate conversion formulae to render the values in metric?
Jim

Sent from my iPad

> On Aug 20, 2016, at 7:32 AM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> There is nothing specific to imperial / US standard units about the equations given in the ABS rules. They work with any self-consistent set of units, and in fact my own software tracks dimensionality using MKS / SI units exclusively.
> 
> Sean
> 
> 
>> On August 20, 2016 6:05:50 AM MDT, Petar Topljak via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> Hi Alec, 
>> 
>> As I understanded that, the D cell is there for another section of different diametre, my design has only one D0 - 1800 mm . 
>> I also have issues with ABS rules as they are made according to imperial system, It would be desirable to have the calculations in my assignment in metric system.
>> 
>> Thank You for quick response; Petar
>> 
>> 2016-08-20 13:56 GMT+02:00 Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org>:
>>> Hi Peter,
>>> 
>>> Welcome, and I wish I'd had that assignment in college! The blue cells are calculated, but for that to happen you need to populate the white ones. For example on your first screen shot, the material properties in column D have not been entered. 
>>> 
>>> 
>>> Best,
>>> 
>>> Alec
>>> 
>>>> On Sat, Aug 20, 2016 at 6:16 AM, Petar Topljak via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>>> Hi everyone, 
>>>> 
>>>> My name is Petar and I am coming from Rijeka, Croatia.  I am designing 1-ATM one man submersible as a project for one of my subjects at my university. 
>>>> 
>>>> The idea is to design a pressure hull that can safely whitstand pressure at 150 meters. Procedure is to design submersible according to ABS (or ASME or any else classification company) rules, create model using 3d modelling software and do a finite element analysis of the model. 
>>>> 
>>>> The problems I ran into are in using the spreadsheet, as there are some parameters that are not defined in the ABS rules, or I am not able to find them or understand them due to my english skills, + we use metric system, so changing creates additional problems. 
>>>> 
>>>> 
>>>> I understand the classic questions asked about the lobes and coefficients (eta), but i had issues with Tw, Lw Lf and tf parametres - "mail3 stiffener.png" am I doing it right ? 
>>>> 
>>>> I am also sending you screenshots of my sheet, so you can check it if you like and alert me for any possible mistakes. 
>>>> 
>>>> Thank You in advance, Petar
>>>> 
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>>> 
>>> 
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>> 
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