[PSUBS-MAILIST] hemi heads

Sat Nov 7 18:01:10 EST 2015

What information do you have on Pisces?

Sean

On November 7, 2015 3:17:54 PM MST, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>I think it a bad idea anyways because my deep diver sphere is a piggy
>weight wise.  No extra weight allowed.  I will be copying Pisces
>opening geometry exactly.Hank 
>
>
>On Saturday, November 7, 2015 3:12 PM, Sean T. Stevenson via
>Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>   
>
>I think that integral is always stronger than fastened, and in any case
>you need to take reinforcement requirements into account. Every opening
>you cut in the hull shell must be reinforced with additional material
>to retain the load carrying capacity. The absolute best way to do that
>is with a monolithic casting, but short of that, cutting a larger
>opening and welding in a thicker shell pad, tapered back to the main
>shell, and welded to the window seat with geometry which minimizes
>stress concentrations is the way to go. If you don't reinforce, you
>need to derate the entire shell, and are then carrying much more weight
>than necessary.That said, having shells which open for access /
>maintenance is not a bad idea, but the flanges or reinforcing rings
>used for this purpose need to be substantial. Sean
>
>
>On November 7, 2015 12:54:35 PM MST, hank pronk via
>Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>I would love to build it so it was all bolted together, I could see
>making bolt on window ports and hatch land.  What do you think about
>that?  What do you think about having the hemi heads machined with a
>flat face instead of a bevel.  Hmmm that would be amazing!Hank 
>
>
>On Saturday, November 7, 2015 10:17 AM, Sean T. Stevenson via
>Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>   
>
>For a pressure hull?  100% radiographic examination (x-ray) on all butt
>joints, 100% ultrasonic examination on all joints other than butt
>joints, not less than 72 hours after welding is complete.Surface
>inspection methods (liquid penetrant, magnetic particle or eddy
>current) at your discretion.Criteria can be found in the ABS Guide for
>Nondestructive Inspection of Hull Welds (NDI Guide).Sean
>
>
>On November 7, 2015 8:57:58 AM MST, hank pronk via
>Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>Sean,I am looking for a company in Calgary to do NDT of welds on my
>deep diver and have discovered there are many different tests
> available.  What tests should I be looking for?Hank 
>
>
>!   On Friday, November 6, 2015 6:51 PM, Sean T. Steve! nson
>viaPersonal_Submersibles <personal_submersibles at psubs.org> wrote:
>   
>
>My thoughts exactly. Thankfully, I've managed to avoid the worst
>effects of the downturn in oil and gas because our clients are
>worldwide. I'm doing some collapse testing right now on some large
>samples for an Alaskan LNG pipeline.  Pretty impressive stuff to see 2"
>wall pipe bend like rubber in the big machines.Sean
>
>
>On November 6, 2015 6:36:00 PM MST, hank pronk via
>Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>Well, now is the perfect time to  bust out the cheque book because
>steel is as low as it is going to be according to EE  and they are
>pretty dead over there.Hank 
>
>
>On Friday, November 6, 2015 5:41 PM, Sean T. Stevenson via
>Personal_Submersibles<personal_submersibles at psubs.org> wrote:
>   
>
>No diesel. It will not operate independent of support capable of
>charging the batteries at the surface, though this may be accomplished
>by a portable generator if need be.It may be left in the water (towed,
>secured alongside, loaded and offloaded etc.) for the duration of an
>expedition, but is not intended for long-term submergence, such as
>seasonal operation.  Crane, A-frame or boat lift retrieval will be
>employed for storage and necessary maintenance.Sean
>
>
>On November 6, 2015 5:16:12 PM MST, hank pronk via
>Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>Do you intend on leaving the sub in the water full time (seasonal)
> Alsso sounds like it could have a diesel engine.Hank 
>
>
>On Friday, November 6, 2015 5:02 PM, Sean T. Stevenson via
>Personal_Submersibles <personal_submersibles at psubs.org>wrote:
>   
>
>Ambitious p! roject,subject to change as funding dictates. 4 person
>lockout submersible (pilot, supervisor, 2 divers). Large for a PSub,
>but sized for road / intermodal transport. Not ramp launchable.
>Operating depth of 600m, safety factor TBD. 48 hour mission, 72 hour
>reserve. Built to full ABS / GL compliance with documented tests (NDT,
>strain gauging, material and proof testing) to enable classification by
>engaging a surveyor in the future, but not classed at this time. When
>construction is completed, it will live in Vancouver - my second
>(first?) home.
>
>Sean
>
>
>
>On November 6, 2015 3:06:12 PM MST, hank pronk via
>Personal_Submersibles <personal_submersibles at psubs.org> w! rote:
>>Hi Sean,We have it all sorted! out,and they are going forward, my
>>minimum thickness should be .875 not bad!  
>>As for your project, are you releasing clues?     Hmmm  that means two
>>subs only 5 hr apart, nice!  Hank 
>
>
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