RE: [PSUBS-MAILIST] Re: Suplies

Correction:

This reminded me to call Midwest about another matter. I discovered Tom has left and his phone is disconnected. The sales rep is now Mike Nichols. Here is their web page, with the new contact info.

http://www.tmrgroup.net/index.htm

Alec

-----Original Message-----
From: Alec Smyth
Sent: Wednesday, February 25, 2004 10:12 AM
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] Re: Suplies

Mark,

I used 516 gr 70 for all hull components; custom rolled cylinders, endcaps, rings, etc. It all came from the same supplier, and here is their contact information:

Tom Rawson

Midwest Metal Fabrication and Custom Rolling

6145 S. Indianapolis Rd.

Whitestown, IN 46075

(317) 769-6484 x226

Please note I did have an out-of-roundness issue with the cylinder, so I’d recommend you include tolerances in your Bill of Materials. It took a lot of work for me to make the pipe round. Other than that, I was highly satisfied.

Thanks,

Alec

-----Original Message-----
From: Mark Woodward [mailto:majwoodward@yahoo.com]
Sent: Tuesday, February 24, 2004 5:28 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Re: Suplies

Hi, I would like to thank allthe people how replied to me. And all of it was very helpful. Now my proublem is I have contacted many companies on what I need and have recieved no phone calls or emails back. If there is any company out there helping anyone here on their project PLEASE try to list them. Because my dream looks like that is all it will be.

Thanks to all, Mark

NeophyteSG@aol.com wrote:

In a message dated 2/20/04 8:22:27 PM Pacific Standard Time, firstratefab@citlink.net writes:

I would venture that there is no grade of steel available for building a vessel that is not available as pipe. Pipe is inevitably attached to a vessel, that pipe equals or exceeds the mechanical properties of the vessel itself. Could you be specific in exactly what steel you are suggesting?

I won't speak for Dan, but I can venture an educated guess. You're probably correct with respect to grades of steel for standard pressure vessels (outside my scope of knowledge). Even though most of us will not be required to comply it, many/most of us are biased to one degree or another by the American Bureau of Shipping (ABS) RULES FOR BUILDING AND CLASSING UNDERWATER VEHICLES, SYSTEMS AND HYPERBARIC FACILITIES or similar international standard (e.g., Lloyds). In the case of ABS, it allows the following types and grades of steel:

ABS Hull Grades CS, E, EH32, EH36
U.S. Navy Grades HY-80 and HY-100 per MIL-S-16216
ASTM A516 Grades 55, 60, 65, 70
ASTM A537 Class 1 and 2
ASTM A517 Grades, A, B, E, F, J

I suspect that part of the reason these grades were chosen were their suitablility for post-weld stress-relief via heat treatment ... also part of the ABS standard. I haven't begun construction yet but I have pretty well narrowed my choice down to one of the grades of ASTM A516 for mine. BTW, it's good to have a (another?) knowledgeable "pipe and pressure vessel guy" to broaden the group's knowledge base.

What type of steel are you planning on using/have you used for yours? Why did you choose it? Any heat treatment planned or used?

Any tips, pointers, sources, suggestions, etc., on hemispherical endcaps?

Warm Regards

Shawn

*****

"Call nothing thy own except thy soul.
Love not what thou art, but only what thou may become.
Do not pursue pleasure, for thou may have the misfortune to overtake it...
Live in the vision of that one for whom great deeds are done ..."

Man of LaMancha, D. Wasserman

Mark Woodward

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