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RE: [PSUBS-MAILIST] Eurosub in the Americas
Bigger window diameter is an issue.
At increase the material cost a lot,
the cost to make it a lot and the frame to hold it also.
vbr Carsten
"Hugh Fulton" <hc.fulton@gmail.com> schrieb:
> Hi Paul,
>
> I started off looking at exotic steels and wanting to use high tensiles etc but it comes to availability and price. My rather off-hand comment on any sub made from 516 / 70 will be OK was I guess a bit flippant but when you try and find formed heads or other parts of the sub which you want to weld in then you need to match the steels. 516/70 is easy to find in Nth America. Carsten is in Europe which has its own supply idiosyncrasies. As Jon says do the calcs on what you can readily get and what depth you want to get to. Charpy is generally for cold pressures. -30 or -40 are normally achieved tests. While you may get that with windchill in the air, the water will never get there and the sub will only get to water temperature. To design for lightness the reinforcing rings are best matched in tensile for the shell properties otherwise you have to go bigger. It is the reinforcing plates that become an issue for higher spec unobtainium. You can get deeper with higher specs but then as you have probably seen Carsten now wants bigger windows which mean thicker and more cost. I would almost start with the size of window you want and look at the thickness and cost and then determine what depth you want. For the visibility I wanted the cost of viewports from Stanley was over $40,000 USD. Now that sat me down and made me question what the hell I wanted. Hope that helps. Hugh
>
>
>
> From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of lassen@rosebud.ca
> Sent: Saturday, 9 January 2010 1:22 p.m.
> To: personal_submersibles@psubs.org
> Subject: RE: [PSUBS-MAILIST] Eurosub in the Americas
>
>
>
> Thanks Hugh,
>
>
>
> If I'm not mistaken the yield strength of A516 Gr 70 is 38KSI whereas S355J2 has a yield strength of 52KSI. This, according to Emile, would decrease the operating depth. Also, I am curious how the Charpy compares. Is charpy at all important in sub design?
>
>
>
> Cheers,
>
>
>
> Paul
>
>
>
> -------- Original Message --------
> Subject: RE: [PSUBS-MAILIST] Eurosub in the Americas
> From: "Hugh Fulton" <hc.fulton@gmail.com>
> Date: Fri, January 08, 2010 5:06 pm
> To: <personal_submersibles@psubs.org>
>
> Hi Paul,
>
> Equivalent is A516 Gr 70
>
>
>
> Grades and equivalents table:
>
>
> ASME
>
> ASTM
>
> DIN17155
>
> EN10028
>
> BS1501
>
>
>
>
>
>
>
>
> Name
>
> Number
>
>
>
>
> SA 516 60
>
> A 516 60
>
> HII
>
> P265GH
>
> 1.0425
>
> 161 430A
>
>
> SA 516 65
>
> A 516 65
>
> 17Mn4
>
> P295GH
>
> 1.0481
>
>
>
>
> SA 516 70
>
> A 516 70
>
>
>
> P355GH
>
>
>
> 224-490 A & B
>
>
>
> Any sub made from 516 Gr70 will be OK
>
>
>
> Regards, Hugh
>
> From: owner-personal_submersibles@psubs.org [ <mailto:owner-personal_submersibles@psubs.org> mailto:owner-personal_submersibles@psubs.org] On Behalf Of Emile van Essen
> Sent: Saturday, 9 January 2010 12:09 p.m.
> To: personal_submersibles@psubs.org
> Subject: RE: [PSUBS-MAILIST] Eurosub in the Americas
>
>
>
> Hi Paul,
>
>
>
> There will probably be tables to compare the steel.
>
> The 355 stands for the yield strength in N/mm2 (Ultimate tensile strength 520 N/mm) It is very common steel ; exotic material will make the sub more expensive and probably more difficult to weld.
>
> Lower or higher yield strength decrease or increase the dive depth.
>
>
>
>
>
> Pipes are even here in Inch sizes! The other problem is that you need just very short pieces and you have to buy lengths. Go with rolled plate!.
>
>
>
> Regards, Emile
>
>
>
>
> _____
>
>
> Van: owner-personal_submersibles@psubs.org [ <mailto:owner-personal_submersibles@psubs.org> mailto:owner-personal_submersibles@psubs.org] Namens lassen@rosebud.ca
> Verzonden: vrijdag 8 januari 2010 23:02
> Aan: personal_submersibles@psubs.org
> Onderwerp: [PSUBS-MAILIST] Eurosub in the Americas
>
>
>
> Hello All,
>
>
>
> I am trying to evaluate the prospect of building the new Eurosub here in Canada. Does anyone know if an ASME or ASTM equivalent exists for the steel that this sub is made of? It is S355J2, a German standard if I'm not mistaken. How might I account for any differences in thickness, overall pipe / end cap diameter and steel engineering properties if I hope to build this sub which uses metric pipe sizes and a steel standard that I don't believe is available here either.
>
>
>
> Cheers,
>
>
>
> Paul
>
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