[PSUBS-MAILIST] V.A.S.T. Mk III to K-250 conversion.

[irox <irox@ix.netcom.com>]

Hi,

I wondering if anybody here has any ideas or insight on this topic.

One of the big differences between the VAST Mk III and the K-250
is that the Mk III VBTs are built into the pressure hull interior
on either side of the conning tower.  Essentially there a two foot
by two foot steel plate welded to the inside of the pressure hull
(see Busby p144).  The VAST Mk III appears to not have internal
ribbing, other than at each end of the cylinder section of the
pressure hull.  Which leaves me thinking that the VBT are also
providing structural support as well.

Since the VBTs are welded from one side only, the welds will not
last as long.  Also it is not possible to inspect the inside of
the tanks for corrosion problems.  So the tanks must be cut open
for inspection.  Installing a K-250 style VBT tank which isn't part
of the pressure hull seems straight forward enough.  But what
about the lack of ribbing? can ribbing be refitted?  will the
remains of the VBT tank (the structural plates of the VBTs
which are perpendicular to the axis of the pressure hull cylinder)
provide enough re-enforcing?

Hopefully my explanation is understandable.  Any advice on how
to deal with this issue much appreciated.  Let me know if I am
not making sense and I'll try to explain it better.

Thanks!
  Ian.





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