[PSUBS-MAILIST] Presure Vessel, Rolled vs. Spun/Stamped

["" <indyair@iquest.net>]

All, 
An early concept pressure vessel/psub design I am working on involves 2 joined 
spheres.  I have read that spheres need to be stamped or spun where as 
cylinders can be rolled.  I get the feeling that having sphere shapes produced 
is more costly than cylinders.  I am trying to get a feel for how much more 
expensive.  Has anyone gone through this exercise or made a similar decision of 
sphere vs. cylinder from a production cost perspective?
Thanks,
Steve McQueen






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