[PSUBS-MAILIST] Terminating a conical transition

[Sean T. Stevenson via Personal_Submersibles]

2:1 semi-elliptical heads are usually fabricated with some length of straight flange (tangential cylindrical section) beyond the axis of the ellipse. Hemispherical heads may or may not have a straight flange section, but in either case are permissible to use adjacent to conical sections, provided all other requirements are met. For stiffened cones, you must have stiffeners meeting the "heavy stiffener" criteria at both ends, as close as practicable to the cone-to-cylinder and cone-to-head transitions. For unstiffened cones, the length L_c used in overall buckling calculations must be the total length between the next heavy stiffener to either side of the entire compartment length, or between the 40% of head depth points if otherwise unbounded.  Cone to head welds are done in the same manner as cone to cylinder welds, and if your head is supplied with a flange, it is the same thing.

Sean


On May 2, 2014 2:48:52 PM MDT, Joe Perkel via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>I have spotted the ABS diagrams and specifications for re-enforcement
>and butt welds at conical to cylinder transitions. I am somewhat
>unclear however as to terminating at the head.
>
>For example, the diagrams in the 2014 ABS underwater vehicles and
>hyperbaric chamber publication shows conical transitions either
>bordered by a cylinder at either end, or simply open at the small
>end???
>
>I want to terminate the small end of a conical transition directly to a
>small diameter hemi-head without another straight section, but I
>am unclear as to whether or not that is acceptable in practice.
>
>Joe
>
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