Abstract:
A fluids management apparatus is disclosed herein that enables management of multiple volumes of different fluids when drilling and/or producing oil and/or gas with an oil and gas well drilling platform. The apparatus includes a structural, transportable frame that has upper and lower reservoir sections, each with a plurality of tanks for holding fluid. The upper reservoir section is easily lifted and transported, such as by crane. A docking station on the lower reservoir section is receptive of the upper reservoir section. A piping system enables a selected fluid volume contained in a tank of the upper reservoir section to be selectively transmitted to a selected tank of the lower reservoir section. The lower reservoir section has its own piping system that enables a user to withdraw fluid from any selected one of its tanks.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     In the US, this is a non provisional patent application of U.S. Provisional Patent Application Ser. No. 61/494,211, filed 7 Jun. 2011. 
     Priority of U.S. Provisional Patent Application Ser. No. 61/494,211, filed 7 Jun. 2011, incorporated herein by reference, 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 the handling of oil and gas well drilling fluids, especially in an offshore or marine environment. More particularly, the present invention relates to an improved oil and gas well fluids transfer apparatus that features a first module carrying multiple supply reservoirs for holding different drilling or production fluids and a second, typically smaller supply module for holding one or more resupply modules. 
     2. General Background of the Invention 
     In the drilling of oil and gas wells, a large number of different fluids are typically employed. These fluids can include various chemicals or chemical formulas that assist in the drilling process. These fluids can include, for example, drilling mud, surfactants, brine solutions, thickening solutions, other oil well drilling or completions fluids and the like. 
     In a coastal or offshore marine environment, the drilling of oil and gas wells employs a platform that can be floating, semi-submersible, fixed, tension leg, spar or the like. Such coastal, offshore or marine oil platforms are well known in the art. 
     An offshore marine platform typically suffers from lack of space. These spacial constraints are due to the enormous expense of constructing offshore drilling platforms. A huge array of equipment is needed for the drilling and completion of oil and gas wells. Constant supply and resupply is an ongoing procedure. Huge work boats carry drill pipe, equipment, personnel, food, drilling fluids, completion fluids, and other material to the offshore platform. Unloading and placement of these supplies is an enormous problem. 
     In the handling of fluids, huge volumes can be required. After the fluids are expended, the tank or other vessel that carried the fluid must quickly be moved from the rig floor to make room for the others. 
     Over the years, 55 gallon drums and other like disposable containers have been used to transfer drilling and other fluids to and from an oil and gas well drilling rig. These drums and like containers create a huge storage problem for the drilling rig operators. 
     BRIEF SUMMARY OF THE INVENTION 
     The present invention provides an improved fluids transfer system that enables a rig operator to efficiently and quickly transfer fluids during normal course of operation of the offshore platform. 
     The present invention provides an efficient and novel and improved system, including a method and apparatus for transferring drilling fluids to an offshore oil and gas well drilling platform and for fluid transfer once on the platform. 
     The present invention provides an improved fluids transfer system having improved structural integrity that enables transport on marine vessels and lifting with cranes and the like while maintaining fluid holding tanks so that leakage is not a problem. 
     The present invention includes a fluids management apparatus for managing multiple, different fluids on an oil and gas well drilling platform, comprising a structural, transportable frame that has upper and lower end portions, a plurality of side walls, a plurality of corners, a base, and an upper panel; a reservoir section on the frame having a plurality of storage reservoirs for holding multiple, separate fluids, one separate fluid in each reservoir; a plurality of flow outlets for discharging a selected fluid from a selected reservoir; a docking station on the frame above the reservoir section, each station configured to receive a tank having a fluid holding interior that connects to a reservoir; piping that enables a selected of the storage reservoirs to transfer its contents to a selected of the storage reservoirs; each wall having vertical and horizontal stiffners, each vertical stiffner having a web, each horizontal stiffner connecting to a said vertical stiffner web; each storage reservoir having a side that is a part of a said side wall, a plurality of transverse sides, and an internal longitudinal wall; a reservoir stiffner panel that extends a partial distance across a said storage reservoir; and a plurality of lifting eyes attached to the frame, at least a pair of said horizontal stiffners attaching to each said lifting eye. 
     Preferably, each reservoir stiffner attaches to a transverse wall. 
     Preferably, there are between 4 and 6 storage reservoirs. 
     Preferably, at least one of the storage reservoirs is smaller than another of the storage reservoirs. 
     Preferably, one of the storage reservoirs extends from one side wall to another side wall. 
     Preferably, the frame has multiple lifting eyes that attach to a side wall and said upper panel. 
     Preferably, each lifting eye is connected to a horizontal stiffner. 
     Preferably, each lifting eye is in the form of a plate that forms an acute angle with a side wall. 
     Preferably, each lifting eye is spaced in between a corner and another lifting eye. 
     Preferably, each tank support is mounted upon a said vertical stiffner. 
     Preferably, the present invention further comprises a plate on the upper end portion of each vertical stiffner, said plate forming a load transfer location for a said tank. 
     The present invention includes a fluids management apparatus for managing multiple, different fluids in an oil and gas well drilling platform, comprising a structural, transportable frame; a lower tank section on the frame having a plurality of interval storage tanks for holding multiple, separate fluids, said interval storage tanks surrounded by external side walls and end walls; a plurality of flow outlets for discharging a selected fluid from a selected interval storage tank; an upper tank section that comprises one or more transportable, crane liftable tanks; a docking station on the frame above the lower tank section that is configured to receive the upper tank section, the upper tank section having a plurality of supply tanks; piping that enables a selected of the supply tanks to transfer its contents to a selected of the interval storage tanks; a plurality of horizontal and a plurality of vertical stiffners on said lower tank section, the horizontal and vertical stiffners intersecting; the docking station including load transfer plates on said vertical stiffners that define supports for receipt of the docking station; each vertical stiffner having a web attached to a wall and a flange attached to a said web; and each load transfer plate at the top of each vertical stiffner, said load transfer plate attached to both said web and said flange. 
     Preferably, there are at least three interval storage tanks. 
     Preferably, there are between 4 and 6 interval storage tanks. 
     Preferably, at least one of the supply tanks is smaller than one of the interval storage tanks. 
     Preferably, all of the supply tanks are smaller than each interval storage tank. 
     Preferably, all of the flow outlets are positioned on the same side of the frame. 
     Preferably, all of the flow outlets are positioned side-by-side and next to each other. 
     Preferably, each supply tank has a supply tank outlet and the piping includes a plurality of flow lines, each connectable to a supply tank outlet. 
     Preferably, each interval storage tank has a flow inlet and the piping includes multiple flow lines that enable flow to be directed to a selected interval storage tank from a selected supply tank. 
     The present invention includes a fluids management apparatus for managing multiple, different fluids in an oil and gas well drilling platform, comprising: a structural, transportable frame having side walls, end walls, a bottom wall and an upper panel; a lower reservoir section on the frame having a plurality of interval storage reservoirs for holding multiple, separate fluids; a plurality of flow outlets for discharging a selected fluid from a selected interval storage reservoir; a docking station on the frame above the lower reservoir section, said docking station configured to receive one or more fluid holding vessels; and a reinforcement system for multiple of said walls that includes intersecting pluralities of horizontal and vertical stiffners, each said vertical stiffner having an upper fitting that provides an attachment for and load transfer from a said fluid holding vessel. 
     Preferably, each vertical stiffner has a web and a flange that is connected to the web and wherein each fitting is attached to both a web and a flange. 
     Preferably, the present invention further comprises an upper frame that holds multiple of said fluid holding vessels. 
     Preferably, said upper frame has legs, each leg resting upon a said fitting. 
     Preferably, the upper frame has one or more doors that can be opened and closed. 
     Preferably, one of the storage reservoirs is a larger reservoir that extends to opposing sides of the interval longitudinal wall and further comprising an opening in the interval longitudinal wall that is in communication with the larger reservoir. 
     Preferably, the upper frame has multiple upper angled plates that each form an obtuse angle with the bottom of a fluid holding vessel. 
    
    
     
       BRIEF DESCRIPTION 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: 
         FIG. 1  is a partial elevation view of a preferred embodiment of the apparatus of the present invention; 
         FIG. 2  is a partial plan view of a preferred embodiment of the apparatus of the present invention, taken along lines  2 - 2  of  FIG. 1 ; 
         FIG. 3  is sectional view of a preferred embodiment of the apparatus of the present invention, taken along lines  3 - 3  of  FIG. 1 ; 
         FIG. 4  is a sectional view taken along lines  4 - 4  of  FIG. 3 ; 
         FIG. 5  is a sectional view taken along lines  5 - 5  of  FIG. 3 ; 
         FIG. 6  is a sectional view taken along lines  6 - 6  of  FIG. 1 ; 
         FIG. 7  is an end view taken along lines  7 - 7  of  FIG. 1 ; 
         FIG. 8  is a sectional view taken along lines  8 - 8  of  FIG. 6 ; 
         FIG. 9  is a schematic partial perspective view of a preferred embodiment of the apparatus of the present invention illustrating the piping; 
         FIG. 10  is a fragmentary perspective view of a preferred embodiment of the apparatus of the present invention illustrating the docking station; 
         FIG. 11  is a fragmentary elevation view of a preferred embodiment of the apparatus of the present invention taken along lines  11 - 11  of  FIG. 10 , illustrating the docking station; 
         FIG. 12  is fragmentary elevation view of a preferred embodiment of the apparatus of the present invention taken along lines  12 - 12  of  FIG. 10 , illustrating the docking station; and 
         FIG. 13  is an elevation view of a preferred embodiment of the apparatus of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       FIGS. 1-13  show generally a preferred embodiment of the apparatus of the present invention, designated generally by the numeral  10  in  FIGS. 1-10 . The apparatus of the present invention can be made of welded metal. Fluids management apparatus  10  provides a storage reservoir  11  having a base  12 . The storage reservoir  11  has an upper end portion  14  and a lower end portion  13 . The upper end portion  14  provides an upper panel  15 . The upper panel  15  has a plurality of openings  18 , each being closeable using a manway cover  16 . 
     A plurality of tank support plates  17  are shown in  FIGS. 1 and 2 . The plurality of support plates  17  connect to and transfer load from a docking station or platform  42  which is shown in more detail in  FIGS. 10-13 . Storage reservoir  11  has a number of internal tanks, such as the six internal tanks that are designated by the numerals  26 ,  27 ,  28 ,  29 ,  30 ,  31  in  FIG. 3 . These internal tanks or internal reservoirs  26 - 31  are surrounded by outer side walls  19 , end walls  20  and internal walls  34 - 40  as seen in  FIG. 3 . Each internal tank/reservoir can be provided with a ladder  33 . Each of the side walls  19  is reinforced with vertical supports  21  and horizontal supports  24 . The upper most flange of horizontal supports  24  is a rim flange  43 . Each vertical support  21  includes a flange  22  that is connected to a web  23 . Each of the support plates  17  is attached to the upper end portion or top of a vertical support  21  as shown in  FIGS. 1 and 7 . The web of each vertical support  21  can be connected (for example welded) to a side wall  19 . In  FIG. 3 , there are three vertical supports  21  attached to one side wall  19  and three additional vertical supports  21  attached to the opposing or other side wall  19  as shown. 
     A plurality of horizontal stiffners  24  can be seen in  FIG. 1 , connected to each side wall  19  and end wall  20  (e.g. welded connection). Each horizontal stiffner  24  extends to a corner  45  of storage reservoir  11  as shown in  FIGS. 2 ,  3 ,  6 . Each horizontal stiffner connects to both flange  22  and web  23  of a vertical support  21  (e.g. a welded connection). 
     A plurality of lifting eyes  25  are provided, one lifting eye position at upper end portion  14  of storage reservoir  11  and next to a corner  45  as shown in  FIGS. 1-2  and  4 - 5 . Each lifting eye  25  provides an opening  46  for attaching rigging such as a sling, shackle, hook or the like to the lifting eye  25  so that the entire apparatus  10  can be lifted with a crane or other lifting device. 
       FIG. 3  shows the individual internal tanks or reservoirs  26 - 31  which are separated with internal walls including a longitudinal wall (or walls)  34  and a plurality of transverse walls  35 - 40 . Wall  34  (or a wall  34 ) is structurally connected (e.g. welded) to end wall  20  (see  FIG. 3 ). The transverse walls  36 ,  39  and  37 ,  40  surround a single tank  26  which extends completely across the storage reservoir  11  from one side wall  19  to the other side wall  19  as shown in  FIGS. 3 and 4 . Opening  41  (see  FIG. 4 ) and longitudinal wall  34  enables fluid to flow freely in tank  26  from one side of longitudinal wall  34  to the other side of wall  34 . 
     A plurality of internal support plates  32  are shown, at least one for each internal tank or reservoir  26 - 30 . The internal tank  26  has two of these vertical plates or support plates  32 . Each support plate  32  extends a partial distance across an internal tank  26 ,  27 ,  28 ,  29 ,  30 , beginning at a transverse wall  35 - 40  as shown in  FIG. 3  and terminating at a free edge or end  47  before reaching another transverse wall. 
     In connection with the piping system  75  of  FIG. 9 , each reservoir or tank  26 - 31  is able to receive fluid from any selected tank  67 ,  68  of rack  65  that can be placed above storage reservoir  11  by using docking station  42  (see  FIGS. 10 ,  13 ). In  FIG. 9 , letters A, B, C, D, E, F are used to designate fittings that transfer fluid from a particular tank  67  or  68  to a selected reservoir  26 ,  27 ,  28 ,  29 ,  30 ,  31 . The letter A in  FIG. 9  is associated with reservoir  26 . The letter B in  FIG. 9  is associated with the reservoir  27 . The letter C in  FIG. 9  is associated with the reservoir  28 . In  FIG. 9 , the letters D, E, F are associated with reservoirs  29 ,  30 ,  31  respectively. Thus, a coupling  72  and hose  71  for tank  67  is shown attaching to a pipe inlet fitting  76  in  FIG. 9  having letter designation “E” meaning that flow from tank  67  is being routed to reservoir  30 . 
     Docking station or platform  42  can been seen in  FIGS. 10-13 . The docking station  42  provides a plurality of a feet  48 , each connected to the lower end portion of a leg  49 . Each of the legs  49  extends upwardly and forms a structural connection to both a perimeter member or beam  50  (which is generally horizontally extending) and a transverse beam or member  58  as shown in  FIGS. 10-12 . A plurality of fittings  51 ,  55  are attached to the beams  50  or  50 ,  58  as shown in  FIGS. 10-12 . These fittings include corner fitting  51  and intermediate fitting  55 . Each corner fitting  51  includes an inclined plate or ramp  52 , another inclined plate or ramp  53 , and a horizontal plate or pad  54 . These three plates or pads  52 ,  53 ,  54  can be structurally connected together (e.g. welding). Each corner fitting  51  is attached (e.g. welded) to the combination of two beams  50  at a corner  74  of docking station  42  as shown in  FIGS. 10-12 . 
     Intermediate fitting  55  includes two plates or pads including an inclined plate or pad or ramp  56  and a horizontal plate or pad  57 . Each intermediate fitting  55  attaches (e.g. welding) to a horizontal member or beam  50  at its intersection with a transverse beam  58  as shown. 
     Multiple catch basins  59  are provided which can be welded to a perimeter horizontal member or beam  50  and a basin support beam  60 . Each catch basin  59  includes side walls  63 , bottom wall  64 , and an end wall or closed end member  62 . Each catch basin  59  has an open end  61  as shown. A bottom wall  64  is inclined toward closed end or end wall  62  as seen in  FIGS. 10-12 . A plurality of catch basins  59  are provided, one for each tank or vessel  67  or  68  that is contained in a transportable rack  65 . The rack  65  can be seen in co-pending U.S. patent application Ser. No. 13/312,547, filed 6 Dec. 2011, which is incorporated herein by reference. Another example of a rack that contains or can contain multiple tanks or vessels can be seen in prior U.S. Pat. Nos. 6,983,704 and 7,552,687, each of which is incorporated herein by reference. Rack  65  provides a base  66  and side walls  73 . Some of the side walls  73  can be in the form of gates that can be opened or closed for adding or removing a selected tank or vessel  67 ,  68  from the rack  65 . 
     Each tank or vessel  67 ,  68  has an upper closure panel or plate  69  and a valved outlet  70  that can have a quick connect coupling  72  for attachment to a hose  71  or other conduit. A piping system  75  is provided which has quick connect couplings  72  for connecting to hose  71 . Hose  71  can connect to a selected pipe inlet fitting  76 ,  77 ,  78 ,  79 . 
     The apparatus  10  of the present invention thus enables the liquid contained in any selected tank  67  or  68  on rack  65  to be transmitted via the piping system  75  to any selected one of the internal tanks or reservoirs  26 - 31 . 
       FIGS. 6-9  show the piping system  75  in more detail, further illustrating the ability to transfer fluid from a selected tank  67  or  68  contained within rack  65  to a selected internal tank or reservoir  26 - 31 . In  FIG. 9 , there are four (4) pluralities of pipe inlet fittings  76 ,  77 ,  78 ,  79  which are provided for transferring fluid from any tank via a pipe inlet fitting. In  FIG. 9  there are four sets of pipe inlet fittings  76 ,  77 ,  78 ,  79  because each set is with each tank  67 ,  68 . Each of these fittings (such as fittings  76 ) provide a separate inlet fitting for sending fluid from a selected tank  67  or  68  to a selected reservoir or internal tank  26 - 31 . There are letter designations A, B, C, D, E, F for each of the plurality of inlet fittings  76 ,  77 , 78 , 79  (as shown in  FIG. 9 ). These designate a particular reservoir or internal tank  26 - 31 . For example, in  FIG. 13 , the flow line  71  is shown attached to quick connect fitting  72  on tank  67 . Another quick connect fitting  72  is provided on the selected inlet fitting  76 . In  FIG. 13  for example, the pipe inlet fitting  76  is designated by the letter “E” which is associated with the internal tank or reservoir  30 . A control valve  86  can thus be opened in  FIG. 13  to discharge the contents of tank  67  via flow line  71  to the pipe inlet fitting  76  having the letter designation E for emptying the contents of tank  67  into the reservoir  30 . Because each tank  67  or  68  is able to connect to any one of four different inlet fittings  76 ,  77 , 78 , or  79 , any tank  67  or  68  can direct flow to any selected internal reservoir  26 ,  27 ,  28 ,  29 ,  30  or  31 . 
     In  FIG. 9 , there can be seen risers  80 - 85 . Each riser  80 - 85  is in fluid communication with a selected reservoir  26 - 31 . The riser  80  communicates with the reservoir  26 . The riser  81  communicates with the reservoir  27 . The riser  82  communicates with the reservoir  28 . The riser  83  communicates with the reservoir  29 . The riser  84  communicates with the reservoir  30 . The riser  85  communicates with the reservoir  31 . 
     In order to discharge the contents of any selected one of the internal tanks or reservoirs  26 - 31 , flow outlets or drains  87 - 92  are provided, one for each internal tank or reservoir  26 - 31  as shown in  FIGS. 3 and 6 . Each of these flow outlets or drains  87 - 92  is part of a flow line  93 - 98 . For example, in  FIGS. 3 and 6 , the flow outlet or drain  87  is part of the flow line  93 . 
     Each of the flow lines  93 - 98  communicates with an outlet flange or fitting  99 - 104 . For example, in  FIGS. 6 and 8 , the flow line  93  is associated with the outlet flange  99 . In this fashion, any one of the reservoirs or internal tanks  26 - 31  can be emptied via a flow line  93 - 98  to a selected outlet flange or fitting  99 - 104 . 
     Base  12  is shown in more detail in  FIGS. 6 and 8  as including longitudinal beams  105 , and transverse beams  106 . Each of the beams  105 ,  106  supports the reservoir floor  107 . Fork lift channels  108  can be seen in  FIG. 6  extending from one side to the other side of the base  12 . Each of the channels  108  provides a socket  44  as shown in  FIG. 4  that is receptive of the tines of a fork lift when it is necessary to transport the storage reservoir  11  using a fork lift. Each of the internal reservoirs  26 - 31  can be vented using a vent  109  in upper panel  15 . Each internal reservoir  26 - 31  can be provided with an access opening or manway  110  in a side wall  19  or end wall  20 . 
     The following is a list of suitable parts and materials for the various elements of the preferred embodiment of the present invention. 
     
       
         
               
             
               
               
             
               
               
             
           
               
                   
               
               
                 PARTS LIST 
               
             
          
           
               
                 Parts Number 
                 Description 
               
               
                   
               
             
          
           
               
                 10 
                 fluids management apparatus 
               
               
                 11 
                 storage reservoir 
               
               
                 12 
                 base 
               
               
                 13 
                 lower end portion 
               
               
                 14 
                 upper end portion 
               
               
                 15 
                 upper panel 
               
               
                 16 
                 manway cover 
               
               
                 17 
                 tank support plate 
               
               
                 18 
                 opening/manway 
               
               
                 19 
                 side wall 
               
               
                 20 
                 end wall 
               
               
                 21 
                 vertical support 
               
               
                 22 
                 flange 
               
               
                 23 
                 web 
               
               
                 24 
                 horizontal stiffner flange 
               
               
                 25 
                 lifting eye 
               
               
                 26 
                 internal tank/reservoir (tank A) 
               
               
                 27 
                 internal tank/reservoir (tank B) 
               
               
                 28 
                 internal tank/reservoir (tank C) 
               
               
                 29 
                 internal tank/reservoir (tank D) 
               
               
                 30 
                 internal tank/reservoir (tank E) 
               
               
                 31 
                 internal tank/reservoir (tank F) 
               
               
                 32 
                 vertical plate/support plate 
               
               
                 33 
                 ladder 
               
               
                 34 
                 longitudinal wall 
               
               
                 35 
                 transverse wall 
               
               
                 36 
                 transverse wall 
               
               
                 37 
                 transverse wall 
               
               
                 38 
                 transverse wall 
               
               
                 39 
                 transverse wall 
               
               
                 40 
                 transverse wall 
               
               
                 41 
                 opening 
               
               
                 42 
                 docking station/platform 
               
               
                 43 
                 rim flange 
               
               
                 44 
                 fork tube opening/channel/socket 
               
               
                 45 
                 corner 
               
               
                 46 
                 opening 
               
               
                 47 
                 free end/free edge 
               
               
                 48 
                 foot 
               
               
                 49 
                 leg 
               
               
                 50 
                 horizontal member/beam 
               
               
                 51 
                 corner fitting 
               
               
                 52 
                 inclined plate/ramp 
               
               
                 53 
                 inclined plate/ramp 
               
               
                 54 
                 horizontal plate/pad 
               
               
                 55 
                 intermediate fitting 
               
               
                 56 
                 inclined plate/ramp 
               
               
                 57 
                 horizontal plate/pad 
               
               
                 58 
                 transverse beam 
               
               
                 59 
                 catch basin 
               
               
                 60 
                 basin support beam 
               
               
                 61 
                 open end 
               
               
                 62 
                 closed end/end wall 
               
               
                 63 
                 side wall 
               
               
                 64 
                 bottom wall 
               
               
                 65 
                 rack 
               
               
                 66 
                 base 
               
               
                 67 
                 tank/vessel 
               
               
                 68 
                 tank/vessel 
               
               
                 69 
                 closure 
               
               
                 70 
                 valved outlet 
               
               
                 71 
                 hose 
               
               
                 72 
                 quick connect coupling 
               
               
                 73 
                 side wall 
               
               
                 74 
                 corner 
               
               
                 75 
                 piping system 
               
               
                 76 
                 pipe inlet fitting 
               
               
                 77 
                 pipe inlet fitting 
               
               
                 78 
                 pipe inlet fitting 
               
               
                 79 
                 pipe inlet fitting 
               
               
                 80 
                 riser (to reservoir 26) 
               
               
                 81 
                 riser (to reservoir 27) 
               
               
                 82 
                 riser (to reservoir 28) 
               
               
                 83 
                 riser (to reservoir 29) 
               
               
                 84 
                 riser (to reservoir 30) 
               
               
                 85 
                 riser (to reservoir 31) 
               
               
                 86 
                 control valve 
               
               
                 87 
                 flow outlet/drain 
               
               
                 88 
                 flow outlet/drain 
               
               
                 89 
                 flow outlet/drain 
               
               
                 90 
                 flow outlet/drain 
               
               
                 91 
                 flow outlet/drain 
               
               
                 92 
                 flow outlet/drain 
               
               
                 93 
                 flow line 
               
               
                 94 
                 flow line 
               
               
                 95 
                 flow line 
               
               
                 96 
                 flow line 
               
               
                 97 
                 flow line 
               
               
                 98 
                 flow line 
               
               
                 99 
                 outlet flange/fitting 
               
               
                 100 
                 outlet flange/fitting 
               
               
                 101 
                 outlet flange/fitting 
               
               
                 102 
                 outlet flange/fitting 
               
               
                 103 
                 outlet flange/fitting 
               
               
                 104 
                 outlet flange/fitting 
               
               
                 105 
                 longitudinal beam 
               
               
                 106 
                 transverse beam 
               
               
                 107 
                 reservoir floor 
               
               
                 108 
                 fork lift channel 
               
               
                 109 
                 vent 
               
               
                 110 
                 access opening/manway 
               
               
                   
               
             
          
         
       
     
     All measurements disclosed herein are at standard temperature and pressure, at sea level on Earth, 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.