[PSUBS-MAILIST] Specs question

[Alan James via Personal_Submersibles]

Scott,this probably differs depending on the cerifying agency.But I have seen the design depth to mean the crush depth. ie depth the sub is designedto crush at. G.L. calls it CDP (collapse diving pressure) TDP (test diving pressure) & NDP(nominal diving pressure).The test depth in relation to the operating depth differs depending on how deep you arebuilding for. If it is a shallow sub TDP is 1.7 x NDP. If deep, TDP is 1.2 x NDP.Also the relationship between CDP & NDP varies depending on your CDP.You do not operate at your test depth, just your nominal dive depth.G.L. Chapter 2 Section 4 C Design Loads.Cheers Alan
      From: via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Wednesday, August 5, 2015 4:13 AM
 Subject: Re: [PSUBS-MAILIST] Specs question
   
Very good information! Thanks Sean! Does anyone know what the requirements are to keep a ABS certification current and what it costs? Thanks,
Scott Waters   
-------- Original Message --------
Subject: Re: [PSUBS-MAILIST] Specs question
From: "Sean T. Stevenson via Personal_Submersibles"
<personal_submersibles at psubs.org>
Date: Tue, August 04, 2015 8:38 am
To: Personal Submersibles General Discussion
<personal_submersibles at psubs.org>

Design depth is the maximum permissible operating depth per design of the vessel, which will be some factor of safety smaller than the critical, or earliest anticipated failure depth. This is specified by the designer and drives the vessel design.Operating depth can be equal to the design depth, or shallower, as it is typically the greatest depth within the design depth to which the vessel has been certified (tested in the presence of the surveyor). Operating depth may also be a de-rating of a previously certified depth for various reasons. PSubs obviously don't typically go through all of the certification procedure, but may be tested unmanned, in which case the successful test depth would constitute the operating depth.Sean


On August 4, 2015 10:00:02 AM CDT, via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
What is the difference between design depth and operational depth? How do you come up with those numbers? Thanks,Scott Waters
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