[PSUBS-MAILIST] pressure test

Wed Oct 23 08:40:58 EDT 2013

The only tank I know about is at Nuytco, and may be short for Gamma in any case. Suggest you send a note to Phil Nuytten directly, as he is the most likely person (possibly on earth) to answer your question with specifics.
Vance

-----Original Message-----
From: hank pronk <hanker_20032000 at yahoo.ca>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Wed, Oct 23, 2013 8:10 am
Subject: Re: [PSUBS-MAILIST] pressure test

Does anyone know if the is a pressure chamber large enough to test  my Nekton submarine in the Pacific North West.  
Hank

From: Phil Nuytten <phil at philnuytten.com>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Sent: Tuesday, October 15, 2013 10:19:38 PM
Subject: Re: [PSUBS-MAILIST] Best Steel to use for Sub Hull

Hi, Hugh
As Vance says, HY80 is somewhat challenging to weld – err, actually, that’s an understatement. We had to work with our fabricators to come up with a whole weld procedure to satisfy our classing agency. If you decide to go this route, let me know and we will share that procedure.
Phil

From: vbra676539 at aol.com 
Sent: Tuesday, October 22, 2013 7:18 PM
To: personal_submersibles at psubs.org 
Subject: Re: [PSUBS-MAILIST] Best Steel to use for Sub Hull

I think it is somewhat demanding to weld, and expensive by comparison, of course. That said, there is a mountain of data available, as the pressure hulls of most modern US Navy submarines are built out of it.
Vance

-----Original Message-----
From: Hugh Fulton <hc.fulton at gmail.com>
To: 'Personal Submersibles General Discussion' <personal_submersibles at psubs.org>
Sent: Tue, Oct 22, 2013 10:15 pm
Subject: Re: [PSUBS-MAILIST] Best Steel to use for Sub Hull

Vance,  Yep that sounds about right.
Are there any nasties to using it?
Chs Hugh

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org?] On Behalf Of Vance Bradley
Sent: Wednesday, 23 October 2013 1:37 p.m.
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] Best Steel to use for Sub Hull

Hugh,

HY-80 used to maintain the standard dimensions of a DW2000 with 50% depth increase.

Vance

Sent from my iPhone

On Oct 22, 2013, at 8:13 PM, "Hugh Fulton" <hc.fulton at gmail.com> wrote:

Vance,  I am sure I saw recently from Phil that he was using HY 80 but I don’t know what on.  I did a calc on mine and I got a lot deeper using the HY 80 specs over the Grade 70.
Hugh

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of vbra676539 at aol.com
Sent: Wednesday, 23 October 2013 11:55 a.m.
To: personal_submersibles at psubs.org
Subject: Re: [PSUBS-MAILIST] Best Steel to use for Sub Hull

One other thing comes to mind on this. Phil uses A516Gr70 in the DW2000s. It occurs to me that if there was a demonstrable benefit to A537, he would have used taken advantage of it. And he didn't, apparently. Interesting. Don't know why, though. Maybe it has something to do with welding stainless inserts in and the heat treatment thereof. Just a guess.

Vance

-----Original Message-----
From: JimToddPsub <JimToddPsub at aol.com>
To: personal_submersibles <personal_submersibles at psubs.org>
Sent: Tue, Oct 22, 2013 6:42 pm
Subject: Re: [PSUBS-MAILIST] Best Steel to use for Sub Hull

Vance,

>From Leeco Steel's website:

A537 plate steel is heat-treated. As a result, it displays greater yield and tensile strength than the more standard A516 grades. A537 steel plate is ideal for both in boilers and pressure vessels, and is used in the oil, gas and petrochemical industry.

Nice to see it provides at least a brief comparison to A516.  I'm sure there are more variables to consider including cost.

Jim

In a message dated 10/22/2013 5:23:43 P.M. Central Daylight Time, vbra676539 at aol.com writes:

Jim,

A537 was used extensively, as well, especially in the early boats that Perry built. Maybe you can figure it out. It seems that I recall being told that it was somewhat harder to weld but had better cold-water-under-pressure properties. Maybe Dr. Nuytten would weigh in on this, assuming he isn't up to his ass in DW3000 alligators this week (which I suspect he is).

Vance

-----Original Message-----
From: JimToddPsub <JimToddPsub at aol.com>
To: personal_submersibles <personal_submersibles at psubs.org>
Sent: Tue, Oct 22, 2013 4:18 pm
Subject: Re: [PSUBS-MAILIST] Best Steel to use for Sub Hull

Greg,

I should have clarified that.  It was a cut-and-paste from a web site.  I'm more of a librarian in that I save info in an organized fashion when I come across it so I'll have it available later when the need arises.  That was the case in this instance.

Jim

In a message dated 10/22/2013 1:25:34 P.M. Central Daylight Time, jgcottrell2002 at yahoo.com writes:

Thanks for the info, Jim. It's good to know there is some one in the group that is also in the steel industry.

Greg

From: "JimToddPsub at aol.com" <JimToddPsub at aol.com>
To: personal_submersibles at psubs.org 
Sent: Tuesday, October 22, 2013 12:59 PM
Subject: Re: [PSUBS-MAILIST] Best Steel to use for Sub Hull

Maybe more detail than you really want to know, but here goes:

ASTM A 516 or ASME SA 516 grade is one of the most popular steel grades in market . 

It is primarily intended for use in welded pressure vessels where notch toughness is important. It comes in four grades 55, 60, 65 & 70. At Oakley Steel we mainly sell 516 gr 60 and 516 gr 70. These grades cover a range of tensile strengths from 55 - 90 MPa and this versatility explains much of the specifications popularity. 

For plates thinner than 40mm we normally supply them as rolled. Plates supplied above 40mm thick are normalised. 

For A 516 grade 70, which is one of our most popular steels, the ASME standard composition is as follows (dependent on grade): 

Carbon 0.27 - 0.31% 
Manganese 0.79 - 1.3% 
Phosphorous 0.035% max 
Sulphur 0.035% max 
Silicon 0.13 - 0.45% 

In a message dated 10/22/2013 11:53:12 A.M. Central Daylight Time, jonw at psubs.org writes:

Generally, A516gr70 suffices for personal or recreational submarines.

Jon

On 10/22/2013 12:45 PM, Christopher Cave wrote:

Hello, 

What is the best steel to use for a submarine hull. Someone mentioned marine steel such as 316,316L or 317. Any suggestions or a website I can review.

Thanks,

Chris 

Christopher Cave 

christophercave at yahoo.com

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