Abstract:
A method of servicing a pipe bundle or riser bundle employs a specially configured hoist having a rail that supports multiple lifts. A selected satellite pipe/conduit of the pipe bundle is both lifted and pulled horizontally in order to remove it from a plurality of supports that hold the satellite pipes together in spaced apart positions. During removal of a satellite pipe, the lifts elevate, then travel with and hold the pipe as it moves horizontally away from the bundle.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This is a continuation of U.S. patent application Ser. No. 13/545,335, filed on Jul. 10, 2012 (issuing as U.S. Pat. No. 8,732,931 on May 27, 2014), which is a continuation of U.S. patent application Ser. No. 12/616,344, filed Nov. 11, 2009 (issued as U.S. Pat. No. 8,214,993 on Jul. 10, 2012), which applications are incorporated herein by reference and to which priority is hereby claimed. 
    
    
     STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
     Not applicable 
     REFERENCE TO A “MICROFICHE APPENDIX” 
     Not applicable 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to riser bundles and the repair or replacement of the satellite tubes or pipes of a riser bundle. More particularly, the present invention relates to an improved method and apparatus for removing one or more satellite tubes or conduits or pipes from a riser bundle, wherein a specially configured hoist and rail arrangement includes separate lifts spaced longitudinally along the riser bundle that enable the removal of a selected satellite tube or conduit or pipe by lifting the selected tube or conduit and then pulling the selected satellite tube or conduit or pipe longitudinally through an opening in an end flange of the riser bundle while the separate lifts travel along the rail while supporting the tube or conduit. 
     2. General Background of the Invention 
     Riser bundles are commonly employed in the collection of petroleum from deep water wells. Examples of riser bundles can be seen for example in U.S. Pat. Nos. 3,911,688; 4,182,584; 4,194,568; 4,388,022; and 6,267,537, each of said patents being incorporated herein by reference. 
     BRIEF SUMMARY OF THE INVENTION 
     The present invention provides a method of removing a satellite pipe from a pipe bundle that includes multiple satellite pipes supported by a plurality of spaced apart pipe supports. The supports can include end supports and intermediate supports. 
     The method includes first supporting the pipe bundle in a generally horizontal position. 
     A hoisting apparatus is provided that includes an overhead rail. The pipe bundle is positioned under the rail, the rail extending along the pipe bundle and generally aligned with the pipe bundle. 
     A plurality of lifts are attached to a selected satellite pipe that is to be removed or serviced. Each lift provides a carriage mounted for travel on the rail and is supported by the carriage, the carriage enabling the lift to travel along the rail. 
     The selected satellite pipe is separated from the intermediate supports and from at least one of the end supports. The selected satellite pipe is then elevated with the lifts, each lift being able to change the elevation of the satellite pipe independently of the other lifts. 
     The selected satellite pipe is moved longitudinally toward one of the end supports, wherein the lifts move simultaneously with the satellite pipe, each lift carriage traveling in the same direction upon the rail. 
     In one embodiment, an end support has an opening and a satellite pipe moves through the opening until it is separated from the pipe bundle. 
     In one embodiment, each support spaces the satellite pipes circumferentially apart. 
     In one embodiment, the pipe bundle is transported laterally from a first position that is spaced away from the hoisting apparatus to a second position which is in a position aligned with the rail. 
     In one embodiment, the pipe bundle is transported laterally by lifting the pipe bundles with one or more wheeled vehicles. 
     In one embodiment, the wheeled vehicles are forklift vehicles. 
     In one embodiment, the method includes supporting the pipe bundle with multiple cradles, each cradle having a base that is configured to rest upon an underlying, generally flat support surface such as a shop floor, slab, or the earth&#39;s surface. 
     In one embodiment, each cradle has an upper end portion that conforms to the shape of the pipe bundle. 
     In one embodiment, each of the satellite pipes has a male end portion and a female end portion. The end supports are male and female end supports. The satellite pipe male end portion is supported by a male end support. The satellite pipe female portion is supported by a female end support. The satellite pipe travels toward the female end support when it is being removed from the pipe bundle. 
     In one embodiment, the hoisting apparatus has a base with decking. 
     In one embodiment, the decking has open areas and the pipe bundle is transported laterally by lifting the pipe bundles with one or more wheeled vehicles (e.g. forklift vehicles) having forklift tines that extend into the open areas. 
     In one embodiment, the method includes providing a human operator next to each lift for operating the lift. In one embodiment, a supervisor conveys commands to the operators regarding elevation information for a particular lift. The supervisor can be positioned next to one of the bundle end supports such as the female bundle end support. 
     In one embodiment, a lift is provided in between each pair of supports. 
     In one embodiment, there is a lift positioned in between a pair of intermediate supports. 
     In one embodiment, the male end portion of each satellite pipe is connected to an end support with a fitting and further comprising the step of removing the fitting. 
     In one embodiment, tension is applied to one end portion of the satellite pipe to be removed during its removal. 
     In one embodiment, the tension can be applied to the female end portion of the satellite pipe during removal of the satellite pipe. 
     In one embodiment, the satellite pipe female end portion is attached to the female end support at an opening in the female end support and the pipe travels through the opening of the female end support when the pipe is being removed. 
     In one embodiment, the lifts support the satellite pipe on opposing sides of the female end support, thus supporting a portion of the satellite pipe that has already traveled through the opening in the female support during its removal. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
       For a further understanding of the nature, objects, and advantages of the present invention, reference should be had to the following detailed description, read in conjunction with the following drawings, wherein like reference numerals denote like elements and wherein: 
         FIGS. 1A-1B  are elevation views illustrating a riser bundle to be serviced, and wherein match lines A-A match  FIG. 1A  to  FIG. 1B ; 
         FIGS. 2A-2B  are plan views illustrating a riser bundle to be serviced, and wherein match lines B-B match  FIG. 2A  to  FIG. 2B ; 
         FIG. 3  is an end view taken along lines  3 - 3  of  FIG. 1A ; 
         FIG. 4  is a sectional view taken along lines  4 - 4  of  FIG. 1A ; 
         FIG. 5  is an end view taken along lines  5 - 5  of  FIG. 1B ; 
         FIG. 6  is a sectional view taken along lines  6 - 6  of  FIG. 2A ; 
         FIG. 7  is a sectional view taken along lines  7 - 7  of  FIG. 2B ; 
         FIG. 8  is a sectional view taken along lines  8 - 8  of  FIG. 6 ; 
         FIG. 9  is a partial perspective view of a part of a satellite tube, conduit or pipe; 
         FIGS. 10A-10B  are elevation views of the hoist portion of the preferred embodiment of the apparatus of the present invention, and wherein match lines A-A match  FIG. 10A  to  FIG. 10B ; 
         FIGS. 11A-11B  are plan views of the hoist portion of the preferred embodiment of the apparatus of the present invention, and wherein lines match lines B-B match  FIG. 11A  to  FIG. 11B ; 
         FIG. 12  is an end view taken along lines  12 - 12  of  FIG. 10A ; 
         FIG. 13  is a plan view of the preferred embodiment of the apparatus of the present invention and illustrating the method of the present invention; 
         FIG. 14  is a partial plan view of the preferred embodiment of the apparatus of the present invention and illustrating the method of the present invention; 
         FIG. 15  is an elevation view of the preferred embodiment of the apparatus of the present invention and illustrating the method of the present invention; 
         FIG. 16  is a fragmentary perspective view illustrating the method of the present invention; 
         FIG. 17  is a fragmentary view illustrating a removal tool for removing part of a satellite tube or conduit; 
         FIG. 18  is a partial perspective view illustrating removal of a part of a satellite tube or conduit; 
         FIG. 19  is a sectional view illustrating removal of a part of a satellite tube or conduit; 
         FIG. 20  is a partial sectional elevation view illustrating removal of a part of a satellite tube or conduit; 
         FIG. 21  is an elevation view illustrating part of the method of the present invention; 
         FIG. 22  is a perspective view illustrating a fitting for removing a satellite tube or conduit from a riser bundle; 
         FIG. 23  is a partial sectional view of the preferred embodiment of the apparatus of the present invention and showing a part of the method of the present invention; 
         FIG. 24  is a partial perspective view illustrating a part of the method of the present invention; 
         FIG. 25  is an elevation view illustrating a part of the method of the present invention; 
         FIG. 26  is a perspective view illustrating a storage rack for storing one or more satellite tubes or conduits that have been removed from a riser bundle; 
         FIG. 27  is an elevation view illustrating a part of the method of the present invention; 
         FIG. 28  is an elevation view illustrating a part of the method of the present invention; 
         FIG. 29  is an elevation view illustrating a part of the method of the present invention; 
         FIG. 30  is an plan view illustrating a part of the method of the present invention; 
         FIG. 31  is an plan view illustrating a part of the method of the present invention; 
         FIG. 32  is an plan view illustrating a part of the method of the present invention; 
         FIG. 33  is an plan view illustrating a part of the method of the present invention; 
         FIG. 34  is an plan view illustrating a part of the method of the present invention; 
         FIG. 35  is an elevation view illustrating a part of the method of the present invention; 
         FIG. 36  is an elevation view illustrating a part of the method of the present invention; 
         FIG. 37  is an elevation view illustrating a part of the method of the present invention; 
         FIG. 38  is a partial perspective view of the preferred embodiment of the apparatus of the present invention and illustrating a part of the method of the present invention; 
         FIG. 39  is a partial perspective view of the preferred embodiment of the apparatus of the present invention and illustrating a part of the method of the present invention; 
         FIG. 40  is an elevation view illustrating a part of the method of the present invention; 
         FIG. 41  is an elevation view illustrating a part of the method of the present invention; 
         FIG. 42  is an elevation view illustrating a part of the method of the present invention; 
         FIG. 43  is a partial perspective view illustrating a part of the method of the present invention; 
         FIG. 44  is a partial sectional elevational view illustrating a part of the method of the present invention; and 
         FIG. 45  is a partial perspective view illustrating a part of the method of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       FIGS. 1A-1B  and  2 A- 2 B show a riser bundle  11  that is to be serviced or repaired. Riser bundle  11  provides a central tube  12  and a plurality of satellite tubes or conduits or pipes  13 ,  14 ,  15 ,  16  and  17 . Intermediate supports  18  are spaced at intervals along the length of the central tube  12  and satellite tubes  13 - 17 . Cradles  19  can be used to support riser bundle  11  as shown in  FIGS. 1A-1B  and  2 A- 2 B. A more detailed view of a cradle  19  can be seen in  FIGS. 3 ,  4  and  5 . Such a cradle  19  can be formed of wood, metal or plastic. Cradle  19  has an upper end portion that is shaped to conform to bundle  11 . Riser bundle  11  has end portions  20 ,  21 . An annular flange or support  22  is provided at end portion  20 . An annular flange or support  26  is provided at end portion  21 . Annular flange  22  provides openings  23 ,  24 . Annular flange  22  provides central opening  25  that is receptive of central tube  12 . Openings  24  in annular flange  22  are receptive of satellite tubes or conduits  13 - 17 . 
     Annular flange  26  has openings  27 ,  28 . Annular flange  26  has central opening  29 . In  FIG. 3 , flange  22  is shown with central tube  12  occupying opening  25 . Satellite tubes or conduits  13 - 17  occupy openings  24 . In  FIG. 4 , intermediate supports  18  are shown supporting each of the plurality of satellite tubes or conduits  13 - 17  at positions that are spaced at intervals in between the flanges  22 ,  26 .  FIG. 5  shows flange  26  which supports satellite tubes or conduits  13 - 17  in openings  28  as shown. The flange or support  22  is a support that connects with and supports the male end portions or male connectors  40  of satellite pipes  13 - 17 . 
       FIG. 4  shows intermediate support  18  in more detail. Each intermediate support  18  is provided with a plurality of clamps  30  that are used to secure a selected satellite tube or conduit or pipe  13 - 17  to the intermediate support  18 . Each clamp  30  includes connections that join it to the intermediate support  18 . In  FIG. 4 , the connections can include a pivotal connection  31  and a bolted connection  32 . A clamp  30  is shown in an open position in phantom lines in  FIG. 4 . Arrows  45  in  FIG. 4  illustrate pivotal movement of a clamp  30  between an open position (phantom lines) and a closed position (hard lines). 
     Each intermediate support  18  can be comprised of a pair of half sections  33 ,  34 . The half sections  33 ,  34  can be held together with bolted connections  35 . Each half section  33 ,  34  provides a clamping portion that can include flanges next to the bolted connection  35 . In  FIG. 4 , the half section  33  has clamping portion  36 . In  FIG. 4 , half section  34  has clamping portion  37 . The clamping portions  36 ,  37  can provide a pair of flanges  38 ,  39  through which the bolted connection  35  is inserted. Thus, each flange  38 ,  39  would provide an opening that is receptive of the bolted connection  35 . 
     The pipe bundle or riser bundle  11  supports the plurality of satellite tubes, conduits, pipes  13 - 17  in a circumferentially spaced apart position as shown in  FIGS. 3 and 4 . Each of the satellite tubes or pipes  13 - 17  has a male connector  40  and a female connector  41 . The male connector  40  is joined to the support  22  using a fitting  42  as shown in FIGS.  6  and  8 - 9 . The connection of male connector  40  to annular flange or support  22  using fitting  42  is known. The connection of fitting  42  to male connector  40  uses a threaded connection which employs internal threads  43  on fitting  42  and external threads  44  on male connector  40  as shown in  FIGS. 8 and 9 . 
       FIG. 7  shows female connector  41  of a satellite tube  14  and its connection to annular flange or support  26 . The connection of a female connector  41  of a satellite tube  14  to annular flange or support  26  is known. 
     In order to remove a selected satellite tube or conduit  13 - 17  from its supports  18 ,  22 ,  26 . A hoist  50  arrangement is employed as shown in  FIGS. 10A ,  10 B,  11 A,  11 B and  12 - 15 . Hoist  50  includes a frame  51  that can have a base  52  with multiple feet  53 . Base  52  and feet  53  engage an underlying support surface  46  such as a slab or floor. Base  52  can provide a network of beams including front longitudinal beams  65 , rear longitudinal beams  66 , and a plurality of horizontal transverse beams  64 . Grating or decking  54  can be provided on base  52  for receiving a pipe bundle  11  that is to be serviced. 
     Hoist  50  includes a plurality of columns  55  that extend upwardly from base  52 . Each column  55  supports an upper horizontal beam  56 . Rail  57  spans between multiple of the upper horizontal beams  56  as shown in  FIGS. 10A-10B ,  11 A- 11 B, and  12 - 15 . A plurality of lifts  61  are provided. Each lift has a carriage  58 . The carriage  58  travels along the rail  57  when a particular selected satellite pipe such as 14 is to be removed from its supports  18 ,  22 ,  26 . Roller bearings  59  can provide an interface between carriage  58  and rail  57  as shown in  FIG. 12 . Roller bearings  59  can engage flange  60  of rail  57 . Other roller bearings can engage other parts of rail  57 . 
     Lift  61  can be any suitable lifting apparatus. The lift  61  can be provided with rigging  68  (for example, sling and shackle). The rigging  68  enables a connection to be made between the lift  61  and the particular satellite pipe  13 - 17  to be removed from the pipe bundle  11 . Such a lift  61  can provide a chain cable or other lifting cable  62 . 
     When a particular satellite pipe or conduit such as conduit  14  is to be removed from pipe bundle or riser bundle  11 , each of the lifts  61  is attached to the selected satellite pipe  14  as shown in  FIG. 21 . However, before lifting selected satellite pipe  14  from the bundle  11 , fitting  42  must be removed using tool  48 . In order to remove the fitting  42 , a protector sleeve  47  is inserted over male connector  40  as shown in  FIGS. 18 and 19 . Tool  48  has projections  49  that engage correspondingly shaped recesses  69  in fitting  42  as shown in  FIG. 19 . Fittings  42  have in some cases have penned portions that must be removed using a hammer and chisel as shown in  FIG. 16 .  FIG. 20  illustrates satellite pipe  14 , its male connector  40  with fitting  42  having been removed. 
     After the fitting  42  has been removed, each of the lifts  61  is connected to a selected pipe (e.g.  14 ). Lift  61  are manned by a human operator  70 . This operator  70  receives instructions from a supervisor  71 . The supervisor  71  is positioned next to annular flange  26  and next to the female end or female connector  41  of the satellite pipe  14  to be removed. In this fashion, any one of the operators  70  can be given instructions to either elevate or lower that portion of the satellite pipe  14  to which a particular lift  61  is connected. The supervisor  70  controls movement of the satellite pipe  14  in the direction of arrow  72  in  FIGS. 21 and 23 . 
     In order to move the pipe  14  in the direction of arrow  72 , a pulling tool  75  is clamped to the female connector  41  of pipe  14  as shown in  FIG. 23 . Pulling tool  75  is attached to cable  73  using hook  74  and shackle  82 . Pulling tool  75  can be comprised of a pair of half sections  76 ,  77 . Each half section  76 ,  77  provides flanges  78 ,  79  that are held together using bolted connections  80  as shown in  FIG. 22 . The bolted connections  80  can apply pressure to hold the pulling tool  75  tightly to the female end or female connector  41  of pipe  14 . While the cable  73  is being pulled in the direction of arrow  72 , each of the operators  70  operates his or her lift  61  to elevate the selected pipe  13 - 17  (such as pipe  14 ) above its supports  18 ,  22 ,  26  a selected distance. 
     In  FIG. 21 , the supervisor  71  is watching the pipe  14  as it moves through an opening  28  in annular flange or support  26 . Shackle  82  can be attached to a yoke or bridle  81  that is welded to the half sections  76 ,  77  as shown in  FIG. 22 . Padding  83  can be added to the inner surface of each of the half sections  76 ,  77  as shown in  FIG. 22 . 
       FIGS. 24 and 25  illustrate movement of satellite pipe  14  and female end  41  in the direction of arrows  72  and after fitting  42  is removed from support  22  and female connector  41  has separated from opening  28  in annular flange  26 .  FIG. 24  is an enlargement of the area next to support  26 .  FIG. 25  illustrates that a lift  61  has traveled along rail  57  with pipe  14 . Lifts  61  are now on both sides of support  26  as shown. Notice in  FIG. 25  that the male end  40  of pipe  14  has now moved away from support  22  and toward support  26 .  FIG. 27  illustrates further movement of pipe  14  in the direction of arrow  72  so that the female connector  41  is now spaced a good distance away from the support  26 . In  FIGS. 28 and 29 , the male end  40  passes through opening  28  in support  26 . In  FIG. 29 , the pipe  14  has been removed from the pipe bundle  11  and is still supported by the plurality of lifts  61 , each manned by an operator  70 . 
     In  FIG. 26 , a satellite pipe rack  90  is shown. The rack or holder  90  provides sections  91 ,  92 . Each of the sections  91 ,  92  can be provided with a plurality of semicircular recesses  93  that are receptive of one or more satellite pipes  13 - 17  to be supported. An elongated strap or other rigging  94  can be used to hold the selected satellite pipes  13 - 17  to the rack  90 . A beam  101  can be provided in between the sections  91 ,  92  as shown in  FIG. 26 . The strap or rigging  94  can encircle a combination of the beam  101  and pipes  13 - 17  to be secured. 
       FIG. 30  illustrates four satellite pipes, each held by multiple racks  90  after removal of the selected satellite pipes  14 - 17  from pipe bundle  11 . Forklifts  85  or other suitable wheeled vehicle can be used to lift the collection of pipes  14 - 17  that are held in the racks  90 . Forklift tines  86  fit into open areas or gaps  63  in the decking or grating  54  of base  52  as shown in  FIG. 30 . Arrows  87  illustrate removal of the combination of satellite pipes  14 - 17  and racks  90  from hoisting apparatus  50  after bundle  11  has been serviced, it can be removed from decking  54  as illustrated by arrows  88  in  FIG. 31 . In  FIG. 31  the selected satellite pipes  14 - 17  have been removed from bundle  11 . 
       FIGS. 32-45  illustrate a reinstallation of the selected satellite pipes  14 - 17  after they have been serviced, such as provided with one or more selected anti-corrosive coatings. 
     In  FIG. 32 , a pair of wheeled vehicles, namely forklifts  85  are shown carrying the cradles  19  that are attached to a part of a riser bundle  11  that has some of all of its satellite pipes  14 - 17  removed. In  FIG. 32 , the forklifts  85  are transporting the larger pipe  12 , intermediate supports  18 , end supports  22 ,  26  and some of the satellite pipes to the hoist apparatus  50 . In  FIG. 33 , there are a plurality of satellite pipes  14 - 17  that have been serviced and are to be returned to the pipe bundle  11  as shown by arrow  84 . In  FIG. 33 , each of the serviced satellite pipes  14 - 17  are held in a pipe rack or holder  90  such as the one that was shown and described with respect to  FIG. 26 . In  FIG. 34 , the cradles  19 , large pipe  12 , and intermediate supports  18  are shown after having been placed upon base  52  of hoist  50 . In  FIG. 34 , the end supports  22  and  26  are also a part of the pipe bundle  11  less those satellite pipes  14 - 17  that have been serviced and are to be returned to the bundle  11 . In  FIG. 36 , operators  70  and their supervisor  71  are shown attaching individual lifts  61  to a satellite pipe  14  that is to be returned to the bundle  11 . Arrows  89  in  FIG. 36  illustrate a lifting of the satellite pipe  14  using the plurality of lifts  61  shown in  FIG. 36 . 
       FIG. 37  illustrates a movement of the satellite pipe  14  in the direction of arrows  95 . In  FIG. 37 , the male connector  40  end of pipe  14  has passed through an opening in support  26  as shown. During this reassembly of satellite pipe  14  to bundle  11 , lifts  61  are shown on both sides of support  26  in  FIG. 37 .  FIG. 38  illustrates a protective sleeve  96  that can be rolled as indicated by arrows  97  into a cylinder shape wherein the cylinder shape is designated by the numeral  98 . In  FIG. 38 , an annular flange  99  is provided having gaps at  100 . The protective sleeve  96  is placed over the male connector  40  part of pipe  14  and threaded through end support  26  as shown in  FIG. 39 . In this fashion, the external threads  44  are protected from damage. 
       FIG. 40  illustrates further movement of satellite pipe  14  in the direction of arrows  95  and wherein most of the satellite pipe  14  has been added to the pipe bundle  11 . In  FIG. 43 , the male connector  40  has reached the support  22 . In  FIG. 44 , tool  48  is shown reattaching fitting  42  to satellite pipe  14 .  FIG. 45  illustrates removal of the sleeve  96 . 
     The following is a list of parts and materials suitable for use in the present invention. 
     
       
         
               
             
               
               
             
           
               
                   
               
               
                 PARTS LIST 
               
             
          
           
               
                 Part Number 
                 Description 
               
               
                   
               
               
                 10 
                 riser handling system 
               
               
                 11 
                 riser bundle/pipe bundle 
               
               
                 12 
                 central tube 
               
               
                 13 
                 satellite tube/conduit/pipe 
               
               
                 14 
                 satellite tube/conduit/pipe 
               
               
                 15 
                 satellite tube/conduit/pipe 
               
               
                 16 
                 satellite tube/conduit/pipe 
               
               
                 17 
                 satellite tube/conduit/pipe 
               
               
                 18 
                 intermediate support 
               
               
                 19 
                 cradle 
               
               
                 20 
                 end portion 
               
               
                 21 
                 end portion 
               
               
                 22 
                 annular flange/support 
               
               
                 23 
                 opening 
               
               
                 24 
                 opening 
               
               
                 25 
                 opening 
               
               
                 26 
                 annular flange/support 
               
               
                 27 
                 opening 
               
               
                 28 
                 opening 
               
               
                 29 
                 opening 
               
               
                 30 
                 clamp 
               
               
                 31 
                 pivotal connection 
               
               
                 32 
                 bolted connection 
               
               
                 33 
                 half section 
               
               
                 34 
                 half section 
               
               
                 35 
                 bolted connection 
               
               
                 36 
                 clamping portion 
               
               
                 37 
                 clamping portion 
               
               
                 38 
                 flange 
               
               
                 39 
                 flange 
               
               
                 40 
                 male connector 
               
               
                 41 
                 female connector 
               
               
                 42 
                 fitting 
               
               
                 43 
                 internal threads 
               
               
                 44 
                 external threads 
               
               
                 45 
                 arrow 
               
               
                 46 
                 underlying support surface 
               
               
                 47 
                 sleeve 
               
               
                 48 
                 tool 
               
               
                 49 
                 projection 
               
               
                 50 
                 hoist 
               
               
                 51 
                 frame 
               
               
                 52 
                 base 
               
               
                 53 
                 foot 
               
               
                 54 
                 grating/decking 
               
               
                 55 
                 column 
               
               
                 56 
                 upper horizontal beam 
               
               
                 57 
                 rail 
               
               
                 58 
                 carriage 
               
               
                 59 
                 roller bearing 
               
               
                 60 
                 flange 
               
               
                 61 
                 lift 
               
               
                 62 
                 lift cable/chain 
               
               
                 63 
                 gap/opening 
               
               
                 64 
                 horizontal transverse beam 
               
               
                 65 
                 front longitudinal beam 
               
               
                 66 
                 rear longitudinal beam 
               
               
                 67 
                 socket 
               
               
                 68 
                 rigging 
               
               
                 69 
                 recess 
               
               
                 70 
                 operator 
               
               
                 71 
                 supervisor 
               
               
                 72 
                 arrow 
               
               
                 73 
                 cable 
               
               
                 74 
                 hook 
               
               
                 75 
                 pulling tool 
               
               
                 76 
                 half section 
               
               
                 77 
                 half section 
               
               
                 78 
                 flange 
               
               
                 79 
                 flange 
               
               
                 80 
                 bolted connection 
               
               
                 81 
                 yoke/bridle 
               
               
                 82 
                 shackle 
               
               
                 83 
                 padding 
               
               
                 84 
                 arrow 
               
               
                 85 
                 forklift 
               
               
                 86 
                 tine 
               
               
                 87 
                 arrow 
               
               
                 88 
                 arrow 
               
               
                 89 
                 arrow 
               
               
                 90 
                 pipe rack/holder 
               
               
                 91 
                 section 
               
               
                 92 
                 section 
               
               
                 93 
                 recesses 
               
               
                 94 
                 strap/rigging 
               
               
                 95 
                 arrow 
               
               
                 96 
                 sleeve 
               
               
                 97 
                 arrow 
               
               
                 98 
                 cylinder 
               
               
                 99 
                 flange 
               
               
                 100  
                 gap 
               
               
                 101  
                 beam 
               
               
                   
               
             
          
         
       
     
     All measurements disclosed herein are at standard temperature and pressure, at sea level on Earth, unless indicated otherwise. All materials used or intended to be used in a human being are biocompatible, unless indicated otherwise. 
     The foregoing embodiments are presented by way of example only; the scope of the present invention is to be limited only by the following claims.