Page 71 - Wire Rope News & Sling Technology - August 2019
P. 71

Denny’s                                    Training Your Kids in
         crane and                            Proper Rigging Methods –

         rigging notes
                                                             Not Like This!

                                                               by Dennis J. O’Rourke, CSP


                                                                              cause the beam to slip and fall from the
                                                                              choker hitch on its 250-foot journey over
                                                                              the heads  of numerous workers  - not
                                                                              the breaking of the sling. All manners
                                                                              of forces can occur to dislodge the beam
                                                                              along its route. To name a few; exces-
                                                                              sive  swing  speed,  sudden  starts/stops,
                                                                              beam caught on the obstacle, weather
                                                                              conditions, or setting one end down and
                                                                              releasing the “bite” allowing the beam
                                                                              to slip and fall. A bundle of metal studs
                                                                              from a single wrap choker hitch like this,
                                                                              occurred at a hotel under construction at
                                                                              Disney, killing one.
         Photos courtesy of Dennis O’Rourke                                   control, yes, a little more annoying for the
                                                                                Simply a “double” wrap choker hitch
                                                                              would have provided all the necessary

                                                                              riggers – but so much safer. A bad meth-
                                                                              od is a bad method no matter how many
                                                                              times you get away with it! And, it’s a ter-
                                                                              rible OJT example for the kids. These ex-
                                                                              perienced riggers may have “fallen prey”
                                                                              to complacency.
           Pictured here is a load attaching method of hoisting an I-  The camera is everywhere nowadays, catching us in the
          Beam some 250 feet in the air via a Tower Crane on a large   “act” as it were.  Companies slogans like  “Safety First,  If
          industrial job site. The crane operator, about 275 feet away   you can’t do it right, don’t do it,” etc. will not stop an unsafe
          from where the beam is to be landed. He has little input as   act, skills training helps. We ask ourselves why people take
          to  how the load is connected to “his Crane.” Yet, he and his   “short-cuts” why don’t people do it right all the time – oh yes,
          Employer will feel the harmful effects of a dropped load, if   people were never made perfect! n
          someone should get hurt – it will be costly.
           The operations are 100% depending upon this rigger’s de-
          cisions;  that will  be made in a matter of seconds  – based
          on his training and experience! He’s performed this “choker
          hitch,” a hundred times before (let’s assume) with no fail-
          ures. The hitch may be the same – but are the working con-
          ditions that affect the outcome all the identical?
           What’s so wrong here that I am taking your time to “rail”
          about anyway? If I were testing someone in an entry-level
          Rigging 101 course, he would fail. Aside from the obvious of
          not running the eye through the yellow oblong link that re-
          duces wire wear and D/d ratio stress on the body of the sling,
          as the sling Manufacture intended. There is no kinking pro-
          tection  (softeners)  between  the  beam/sling  contact  points.
          However, there is a much more important error.
           These experienced Ironworkers know that this thirty-foot,   Corrected: Double Wrap, Softeners, and a Skackle in the “bite.”
          W 14 x 82 beam weighs about 2460 pounds, (1230 each end)   From the Author: Readers, these published “Notes” are subjects that I
          is not going to break the 3/4 diameter Wire Rope sling they   have experienced over the five decades I’ve spent in the Crane and Rig-
          are using. So, they feel justified in abusing their employer’s   ging industry as a heavy equipment mechanic, safety engineer, business
                                                              owner, and the former president of Crane Certifiers Association of Amer-
          equipment; after all, men will be men! So, bothersome soften-  ica. This information was accumulated over that period. I would appreci-
          ers and sling body wear/stress is “kids stuff” not to slow down   ate your comments, additions, or corrections. These are the reflections
          production and make this work harder than it is. There is   and opinions of one person, on a serious subject.
                                                               Dennis J O’Rourke, (dennis@natlcrane.com)
          some logic here, and I had witnessed an overuse of personal
                                                               DENNIS J. O’ROURKE, CSP, is the Director of National Crane Services, Inc. He has over
          protection equipment (PPE), making things harder for the   fifty years’ experience in the industrial, maritime, and construction fields working with heavy
          workers when no hazards existed, frustrating the people.  equipment and material handling devices. As a safety engineer, Mr. O’Rourke has developed
                                                              and/or presented over 300 safety-training programs for all representative elements of govern-
           The real “violation” here is the lack of control that could   ment and industry.
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