First you need to figure out how to spell "Crane"...just kidding...
Design and Fabrication of Cranes for shipboard use are controlled by ABS (American Bureau of Shipping). I don't remember the applicable publication titles right now, but I do remember that to weld on an ABS crane, your Welders Performance Qualification test has to be witnessed by an ABS Representative.
API (American Petroleum Institute) has a specification for cranes titled "2C".
Those are the only two I know of but I'm sure some other guys in this forum can fill in the rest...