[PSUBS-MAILIST] hemi heads

Sat Nov 7 17:17:54 EST 2015

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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