[PSUBS-MAILIST] reinforcement

[Pete Niedermayr via Personal_Submersibles]

Been quiet for a week now anybody home ?
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On Tue, 11/14/17, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] reinforcement
 To: "Sean T. Stevenson via Personal_Submersibles" <personal_submersibles at psubs.org>
 Date: Tuesday, November 14, 2017, 7:09 PM
 
 
             Thanks' Sean,I will add
 thickness to the ring,  for a bigger comfort zone.  The
 flat plate is original to Gamma so no worries about it
 failing.Hank
 
             
             
                 
                     
                     
                         On Tuesday, November 14, 2017,
 5:53:37 PM MST, Sean T. Stevenson via Personal_Submersibles
 <personal_submersibles at psubs.org> wrote:
                     
                     
 
                     
 
                     If you
 were to meticulously torque the bolts to a sufficient
 preload to ensure that the connection could reliably carry
 shear forces, then technically it would carry some load;
 however, it is unwise to rely on that for the purpose of
 determining required penetration reinforcement - certainly
 if the forces are transferred entirely in shear. If instead,
 the plate was loaded in radial compression (i.e. inset into
 the seat and bearing on the outer cylindrical surface), then
 there would be some direct load transfer, but the exercise
 is academic.  As with an acrylic window, design the ring
 under the assumption that the seat ring and associated
 reinforcement must carry all hull stresses. The flat plate
 that bolts on should then be designed in accordance with the
 rules for unstayed flat heads (ABS Steel Vessel Rules).
 
 Sean
 
 
 Sent from ProtonMail mobile
 
 
 
 -------- Original Message --------
 On Nov 14, 2017, 15:43, hank pronk via
 Personal_Submersibles <
 personal_submersibles at psubs.org> wrote:
 HI Sean,I am
 taking your suggestion and ordering a heavy ring to mount my
 motor assembly to rather than use the original pipe
 assembly.  .  It will be like a port frame but with a
 5\8 steel plate with a prop shaft tube weld to the
 centre with giant gussets.  Normally I would weld in a ring
 that is several time heavier than it needs to be, but in
 this case I can not get crazy with weight.  The weight is
 important because it is still an escape pod.  I have sized
 the ring to be 20% heavier than the material removed from
 the sphere.  I am assuming that the 5\8 plate that is
 bolted to the ring adds support to the ring.  I realize the
 added plate is only as strong as the bolts securing it, but
 there must be a benefit, or does this not
 count? Hank_______________________________________________
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 Personal_Submersibles at psubs.org
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