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[PSUBS-MAILIST] Greg, re: dome(s) for Dart 37 design...

Hi Greg,

I am designing a 27ft submarine that utilizes K350 pressure hull arrangements although the outside diameter has been increased to 1100mm and the wall thickness to 1/2"  with end cap 3/4" Strange when you talk in two different measurement systems :-)

I have two questions for you, if you don't mind.

My design calls for two domes.  These will be permanently in place, not intended to be a access-way.  The idea is that the main ballast tank is also an access space when on the surface and drained. www.psubs.engineer.net.au

Staying within the K350 specification in terms of operational depth and related testing...

Is it process feasible to construct a dome that has an inside diameter of 520 mm and outside diameter 600 mm. In other words 40 mm wall thickness and perhaps 35 mm at the apex?  

From what I have been reading the wall thickness for diameter is probable more than enough for a 350 ft operational depth.

Second question, cost?  Won't hold you to any figure given as in a quotation, just an estimate please because as I progress the design I have a spreadsheet plug for a materials list and their estimated costings.

Any other ideas, suggests please do not hestiate to let me know.  Always appreciate input and assistance from others.  Likewise where I can help out.

Best regards,

Lawrie.

 

 

 

On Wed, 15 Jun 2011 13:45:59 -0400, "Greg Cottrell" <greg@precisionplastics.com> wrote:

Depth capability for free blown domes depends on many factors. We have formed some that have been tested as deep as 2000 ft (over 600 M).

 

Greg Cottrell

Project Manager

 

 

greg@precisionplastics.com

http://www.precisionplastics.com

 

P please consider the environment before printing this email

From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Emile van Essen
Sent: Wednesday, June 15, 2011 1:38 PM
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] Dome ;was Own submarine pen (Eurosub)

 

Jon,

 

Conversion factor??

Operational depth estimate comes from GL table. If you look up the scale destruction test data in Stachiw’s book, it will fail at some 2500 M.

 

Emile

 

Van: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] Namens Jon Wallace
Verzonden: woensdag 15 juni 2011 5:39
Aan: personal_submersibles@psubs.org
Onderwerp: Re: [PSUBS-MAILIST] Dome ;was Own submarine pen (Eurosub)

 

Emile,

I assume you are not including a conversion factor to get the 500M depth estimate?

Jon

On 6/12/2011 7:10 AM, Emile van Essen wrote:

Hi Alan,

 

Nemo 100 makes the domes also with the hot pressing method.

Blowing is the simplest way and make the tooling is the least effort. Limit is 200 metres in my opinion.

Pressing is far better for roundness , material efficiency and thickness.

For the 24” / 610 mm OD. Dome we start with 35 mm plate. After forming it is still 35 mm on the edge and 25 in the apex!. Good for some 500 M ;-)

 

Emile

 

 

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