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 Sea  Link  Wooden  Shell                                     an auxiliary hoist wire rope 38. A live end of the auxiliary
         hoist mechanism 25, and an auxiliary hoist mechanism 39.
                                                              hoist wire rope 38 is secured to an auxiliary hoist winch 39
         In the crane 20, the hoist rope 23 is a main hoist wire rope,
 Construction  &  Fishing  Blocks                             mounted to the boom 22. A dead end of the auxiliary hoist
         and the hoist mechanism 25 is a main hoist winch. A live
                                                              wire rope 38 is secured to an overhaul ball 40. The auxiliary
         end of the main hoist wire rope 23 is secured to the main
         hoist winch 25, which draws in the main hoist wire rope 23   hoist wire rope 38 runs over the boom point sheave assembly
         to lift the payload 24. A dead end 32 of the main hoist wire   35 and over a sheave 41 at the distal end of the jib 37.
 S Siinnggllees  •  Ds  •  Doouubblleess • •   T Trriipplleess • •   R Reegguullaar  ar  annd  Hd  Heeaavvy  Wy  Wooooddeen  Bn  Blloocckkss  Figure 14 shows a second kind of offshore crane 50 that
         rope 23 is secured to the boom 22. A hoist block 33 carrying
         the main hook 34 attaches the main hoist wire rope 23 to   also is susceptible to heave loads when performing an off-
         the payload 24. For example, the hoist block 33 provides a   board lift. In general, the crane 50 has a base 51, a boom 52
         maximum lift of 25 short tons (22.7 metric tons). The main   mounted to the base 51, a hoist rope 53 descending from the
         hoist wire rope 23 runs over a boom point sheave assembly   boom for attachment to a payload 54, and a hoist mechanism
         35 and over a sheave assembly 36 in a jib 37 extending from   55 mounted to the base 51 for applying tension to the hoist
         the boom  22.  The combination of the sheave assembly  36   rope 53 to lift the payload 54.
         and the hoist block 33 organizes the main hoist wire rope 23   In particular, the crane 50 is a pedestal-mounted offshore
         into a four part reeving so that the tension on the main hoist   crane having a lattice-frame boom  52.  A  specific  example
         wire rope 23 is about one-quarter of the tension applied on   of such a crane is a NAUTILUS® brand of pedestal marine
         the main hook 34 from the payload 24. The crane 20 also has   crane Model 1400L.5-170 sold by Oil States Industries, Inc.
                                                              of Arlington, TX. The lattice frame of the boom 52 is efficient
                                                              for the large size of the crane 50. The base 51 is a cylindrical
                                                              pedestal, and the boom 52 is mounted to the pedestal via a
                                                              swing-circle assembly 56. The swing circle assembly 56 ro-
                                                              tates the boom 52 about a central vertical axis 57 of the ped-
                                                              estal 51. In addition, a heel pin 58 pivotally mounts the boom
 All  Material  Factory  Certified                            52 to the swing-circle assembly 56 so that a boom hoist winch
 Wooden  Shell  Blocks  3”  to  16”                           59 may erect the boom 52 to a desired angle of inclination.
                                                              For example, at a zero angle of inclination, the boom 52 is
 For  more  Associated  Wire  Rope  &  Rigging,  Inc. Waterman  Supply  Co.,  Inc.  horizontal and provides a radius of 177 feet (54 meters) from
 information,  8125  Saran  Drive,  Playa  Del  Rey,  CA  90293  910  Mahar  Ave.,  Wilmington,  CA  90748  the pedestal axis 57 to a main hook 68. The boom hoist winch
 contact:  Ph:  1-800-901-1135  Fax:  310-448-5446  Ph:  1-800-322-3131  Fax:  310-522-1043  59 reels in a boom hoist wire rope 60 to raise the boom 52. In
 Email:  awrrinc@earthlink.net  Email:  waterman@bigplanet.com  this fashion, a jib 61 extending from the boom 52 is positioned
                                                              over a first location to pick up the payload 54, and then posi-
         Figure 13:  Side view of a conventional pedestal-mounted  offshore
         crane having a box-frame boom.                                                       continued on next page
 Wire  Rope  News  &  Sling  Technology          August  2006  37  Wire Rope News & Sling Technology   August 2017  63
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