Page 59 - Wire Rope News & Sling Technology
P. 59

continued  from  page  10
 right  off  the  bat  not  to  do  that.  I  just
 he has kept to this day, which has
 played the game. I ate, drank, and
 allowed him to become a successful
 partied  when  the  hosts  suggested  it.  I
 importer from the very start of his
 never  said  no.  I  was  astute  with  chop
 business. He typically drop ships
 stick,  learned  how  to  toast  directly,  and
 container  loads  to those  suppliers  in
 acted  with  all  the  proper  manners. I
 North  America  and  Europe  who  don’t
 made  a  point  to  learn  all  these  things.
 have these contacts which Cushman
 My hosts often said I must have an
 has  built  up  over  the  years.
 oriental wife. For this reason I was
 Is becoming a successful importer
 accepted much quicker  than I  might
 simply  a  matter  of  traveling  to  a  foreign
 have  been  otherwise.”
 company  and  placing  an  order?  Hardly.
 In  a  typical  day  one  supplier  would
 To get good deals and build loyalty
 take  him  to  breakfast  and  then  on  a
 takes  not  only  business  savvy  but  also
 factory  tour.  Then  he  would  be  handed
 considerable cultural acumen.
 off to another supplier and go on
 Cushman  got  his  start  in  learning  how
 another  tour.  Back  at  the  hotel  he  had  a
 to  relate  to  businessmen  from  different
 half  hour  to  clean  up  and  then  it  was  off
 cultures when they would visit this
 to  a  dinner  and  party  which  would  last
 country  and  he  would  meet  them  in  the
 until  midnight.  Cushman  traveled  for
 hope  of  picking  up  new  vendors.  “We
 about 12 years. Normally he would
 would  hang  out  together  and  we  would
 embark  every  nine  months  for  two  to
 always go out in the evening,”
 three  weeks.  “The  hardest  was  when  I
 Cushman  recalls.  “I  soon  learned  that
 had  23  flights  in  22  days,”he  recalls.
 Koreans, Chinese, and others from
 Cushman had many interesting
 oriental  countries  did  not  like  steak  or
 experiences on his travels. “My first
 hamburgers.  I  would  take  them  to  the
 experience  in  mainland  China  in  the
 best ethnic restaurant representing
                           company’s  116'  long  test  bed.
 1980s  was  like  going  back  200  years,  he
 their  culture.  I  still  do  that  today.”
                           world for two weeks. No one knew
 recalls.  “There  was  no  infrastructure,
 When Cushman began visiting
                           where  I  was. My family was  a  little
 no  transportation  systems,  and  limited
 foreign countries, he knew how to
                           concerned.  My  wife  said  never  do  that
 accomodations.  On  my  second  trip  to
 behave.  “A  lot  of  people  don’t  believe  in
                                          continued  on  page  16
 China  I  was  cut  off  from  the  outside
 mixing  in  and  think  it’s  best  to  remain   a  little  aloof,”  Cushman  says.  “I  learned   1-3/4"  boom  pendants  being  tested  on  the
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         sates for heave and that can also be actively driven for fur-  tion. Additionally, the passive heave compensation devices
 12                  Wire  Rope  News  &  Sling  Technology          August  2006
         ther heave compensation).                            in some instances include an active component as well, such
           Various examples of hoisting systems having both active   as a hydraulic cylinder that passively compensates for heave
         and passive heave compensation are generally depicted in   but can also be selectively driven by equipment on the vessel
         figures  14-18  in  accordance  with  certain  embodiments.  In   12 to actively compensate for heave. In figure 18, a hoisting
         each of these examples, the hoisting system includes a draw-  system is shown as having passive heave compensation that
         works 22 with active heave compensation applied by rotat-  rotates the drawworks drum 26 along with the active heave
         ing the drawworks drum, such as described above. The drum   compensation. While a single hoisting line 20 is depicted in
         26 of the drawworks 22 can be driven in any suitable man-  each of figures 14-18, it is noted that the hoisting systems
         ner, such as by electric or hydraulic motors. In those hoisting   represented  in  these  figures  could  use  multiple  hoisting
         systems depicted in figures 14-17, passive heave compensa-  lines 20, and that additional elements (e.g., hydraulic cylin-
         tion is provided by hydraulic cylinders that are used to move   ders for passive heave compensation) can be added for use
         sheaves in the hoisting system to counter heaving motion of   with the additional hoisting lines 20.
         the floating vessel 12. But hydraulic motors or other devices   One approach to increasing hoisting capacity of a hoisting
         could also or instead be used for passive heave compensa-  system is to increase the number and size of the hoisting
                                                              lines. The hoisting lines can also be reeved between addi-
                                                              tional sheaves in the crown  block and the traveling block
                                                              to increase the  number  of parts in  the lines  that run  be-
                                                              tween the crown block and the traveling block to increase
                                                              the mechanical advantage. But a drawback to this approach
                                                              is that it adds friction to the system and reduces the travel-
                                                              ing speed of the hoisted load relative to the rotational speed
                                                              of a drawworks drum. The added friction is amplified in an
                                                              active heave compensating drawworks, negatively affecting
                                                              the goal of achieving a constant weight-on-bit during heav-
                                                              ing motion of a drilling vessel. By way of example, typical
                                                              1000-ton or 1250-ton hoisting systems can have multi-part
                                                              hoisting lines with sixteen parts in a block-and-tackle reev-
                                                              ing and sixteen or seventeen sheaves, and use a two-inch
                                                              diameter wire rope. Such systems can have losses of approx-
                                                              imately  15%  or  20%  due  to  the  reeving  efficiencies  alone.
                                                              Further accounting for the inertia effects of the rotating sys-
         Figure 17: Fourth example of a hoisting system.                                      continued on next page
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