Abstract:
Tube scrapper projectiles for tube cleaning applications such as condenser and chiller tube cleaning utilizing projectile-based mechanical agitation of tubes and pipes. In some cases, the tube cleaning projectiles are configured for selectable indexing of various biasing levels for the blades and in some cases the biasing elements comprise a plurality of arcuate and/or tapered beams oriented axially along the scraper projectile.

Description:
BACKGROUND 
     Air conditioning, industrial chilling and power plant steam condensing systems are typically configured with arrays of tubes. Boilers and other commercial or industrial equipment may also include fluid tubes to provide various heat exchange functionality. Such tubes must be serviced to maintain efficient energy use, prevent or reduce fouling and corrosion and such servicing typically involves utilization of both mechanical and fluid treatment on the interior surfaces of the tubes. The fluid treatment itself often includes application of chemical cleaners or inhibitors. In some cases, different tools may be utilized for each of the mechanical agitation, chemical application, and powered fluid cleaning or washing. 
     One type of tool that may be utilized to effectuate mechanical agitation of tube deposits is a projectile that includes scraper blades, the projectile being forcibly passed (e.g., fired or shot) through a tube being serviced. Examples of tube scraper projectiles utilized in the tube cleaning industry are described in U.S. Pat. No. 5,305,488 issued to Lyle (“Lyle I”) and titled “TUBE CLEANING TOOL”, U.S. Pat. No. 7,454,812 issued to Lyle (“Lyle II”) and titled “TUBE CLEANING TOOL”. 
     Such projectiles generally include one or more scraper blades for scrapping the inside diameter of a tube or pipe and some mechanism for biasing the scraper blades against the inside walls of the tube or pipe. One typical mechanism for biasing the scraper blades (such as utilized in the Lyle I) includes a rubber bushing nested within or under the blades. Compression of the projectile assembly, e.g., by tightening a retaining nut, forces radial expansion of the rubber bushing, which applies increasing biasing forces on the scraper blades in an outward radial direction. Such typical projectiles, however, may suffer from various deficiencies. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       An understanding of embodiments described herein and many of the attendant advantages thereof may be readily obtained by reference to the following detailed description when considered with the accompanying drawings, wherein: 
         FIG. 1A  is an upper, back-left perspective view of a tube scraper projectile assembly according to some embodiments; 
         FIG. 1B  is an upper, front-right perspective view of the tube scraper projectile assembly of  FIG. 1A ; 
         FIG. 2A  is an upper, back-left perspective view of a tube scraper shaft element according to some embodiments; 
         FIG. 2B  is an upper, front-right perspective view of the tube scraper shaft element of  FIG. 2A ; 
         FIG. 3A  is an upper, back-left perspective view of a tube scraper blade element according to some embodiments; 
         FIG. 3B  is an upper, front-right perspective view of the tube scraper blade element of  FIG. 3A ; 
         FIG. 4A  is an upper, back-left perspective view of a tube scraper biasing element according to some embodiments; 
         FIG. 4B  is an upper, front-right perspective view of the tube scraper biasing element of  FIG. 4A ; 
         FIG. 5A  is an upper, back-left perspective view of a tube scraper piston element according to some embodiments; 
         FIG. 5B  is an upper, front-right perspective view of the tube scraper piston element of  FIG. 5A ; and 
         FIG. 6  is an upper, back-left perspective assembly view of a tube scraper projectile assembly according to some embodiments. 
     
    
    
     DETAILED DESCRIPTION 
     I. Introduction 
     Embodiments presented herein are descriptive of tube scraper projectiles (and components and/or features thereof). Tube scrapper projectile assemblies may comprise various components, for example, such as an arcuate, tapered, and/or pliant beam biasing element and/or a may comprise a selectively indexable biasing level (e.g., six (6) distinctly selectable biasing levels), as described in detail herein. 
     II. Tube Scraper Projectile Assemblies 
     Turning initially to  FIG. 1A  and  FIG. 1B , an upper, back-left perspective view and an upper, front-right perspective view, respectively, of a tube scraper projectile assembly  100  according to some embodiments are shown. In some embodiments, the tube scraper projectile assembly  100  may be disposed along an axis and be identifiable as having a first end “A” and a second end “B”, as shown. According to some embodiments, the tube scraper projectile assembly  100  may comprise a shaft  110  (e.g., also disposed and/or oriented along the axis) comprising a stop portion  116 , a bore  116 - 1 , and/or an indexing feature  118 - 1 . In some embodiments, the tube scraper projectile assembly  100  may comprise a plurality of cutting elements  120   a - b  mounted to, coupled to, seated on, and/or otherwise disposed on the shaft  110 . The cutting elements  120   a - b  may comprise, for example, a plurality of cutting arms  124   a - b , each cutting arm  124   a - b  comprising a scrapping or cutting tool  126   a - b . A first cutting element  120   a  may comprise a plurality of cutting arms  124   a  extending longitudinally along the axis with cutting tools  126   a  extending normal to the axis and oriented around the circumference of the tube scraper projectile assembly  100  (e.g., such that distal portions of the cutting tools  126   a  are oriented to engage in a scrapping or cutting action with an interior surface of a tube or pipe (not shown) in which the tube scraper projectile assembly  100  is inserted and/or propelled). A second cutting element  120   b  may also or alternatively comprise a plurality of cutting arms  124   b  extending longitudinally along the axis with cutting tools  126   b  extending normal to the axis and oriented around the circumference of the tube scraper projectile assembly  100  (e.g., such that distal portions of the cutting tools  126   b  are oriented to engage in a scrapping or cutting action with an interior surface of a tube or pipe (not shown) in which the tube scraper projectile assembly  100  is inserted and/or propelled). 
     According to some embodiments, the tube scraper projectile assembly  100  may comprise one or more radial biasing elements  130  mounted to, coupled to, seated on, and/or otherwise disposed on the shaft  110 . The radial biasing element  130  (e.g., a first radial biasing element  130 ) may comprise, for example, a plurality of arcuate arms or beams  134  disposed longitudinally along the axis and/or nested with (e.g., underneath) the cutting arms  124   a  of the first cutting element  120   a  and/or the cutting arms  124   b  of the second cutting element  120   b . The arcuate beams  134  may, for example, be forcibly nested with the cutting arms  124   a - b , thereby asserting a biasing force against the underside of the cutting arms  124   a - b  and accordingly biasing the cutting tools  126   a - b  in an outward radial direction (e.g., to resistively engage an inside surface of a pipe or tube (not shown)). According to some embodiments, the radial biasing element  130  may comprise an arcuate beam  134  for each corresponding cutting arm  124   a - b . In such a manner, for example, each arcuate beam  134  may be oriented in a particular circumferential position around the shaft  110  (and/or around or about the tube scraper projectile assembly  100 ) such that it aligns with a circumferential position of a corresponding cutting arm  124   a - b  (such as the cutting arms  124   a  of the first cutting element  120   a , as depicted in  FIG. 1A  and  FIG. 1B ). 
     In some embodiments, the tube scraper projectile assembly  100  may comprise a piston element  140  mounted to, coupled to, seated on, and/or otherwise disposed on the shaft  110 . The piston element  140  may comprise, for example, a body portion  140 - 1  disposed along the axis. According to some embodiments, the body portion  140 - 1  may be coupled to and/or comprise a radial biasing element  142  (e.g., a second radial biasing element  142 ) comprising a plurality of arcuate beams  144 . The piston element  140  may be oriented along the axis, on the shaft  110 , and/or may be disposed, for example, such that the arcuate beams  144  are nested or fitted with the cutting arms  124   a - b  (e.g., the cutting arms  124   b  of the second cutting element  120   b , as shown). The arcuate beams  144  may, for example, be forcibly nested with the cutting arms  124   a - b , thereby asserting a biasing force against the underside of the cutting arms  124   a - b  and accordingly biasing the cutting tools  126   a - b  in an outward radial direction (e.g., to resistively engage an inside surface of a pipe or tube (not shown)). According to some embodiments, the second radial biasing element  142  may comprise an arcuate beam  144  for each corresponding cutting arm  124   a - b . In such a manner, for example, each arcuate beam  144  may be oriented in a particular circumferential position around the shaft  110  (and/or around or about the tube scraper projectile assembly  100 ) such that it aligns with a circumferential position of a corresponding cutting arm  124   a - b  (such as the cutting arms  124   b  of the second cutting element  120   b , as depicted in  FIG. 1A  and  FIG. 1B ). 
     According to some embodiments, the piston element  140  may be coupled to the shaft  110  to retain the cutting elements  120   a - b  and the first radial biasing element  130  on the shaft  110  and/or on the tube scraper projectile assembly  100 . The first cutting element  120   a  may be retained at the first end “A” of the shaft  110  (and/or the first end “A” of the tube scraper projectile assembly  100 ) by the stop portion  116 , for example, and/or the piston element  140  may be removably coupled to the shaft  110  at or near the second end “B” of the shaft  110  (and/or the second end “B” of the tube scraper projectile assembly  100 ). In some embodiments, the engagement and/or coupling of the piston element  140  with the shaft  110  may be adjusted to vary the amount of axial pressure by which the tube scraper projectile assembly  100  is retained about or on the shaft  110 . According to some embodiments, the piston element  140  may comprise a latch feature  146  that may be selectively engaged with the indexing feature  118 - 1  of the shaft  110 . 
     In the case that the piston element  140  is coupled to the shaft  110  via threads (not shown in  FIG. 1A  or  FIG. 1B ), for example, a clock-wise (right-turn) rotational engagement of the piston element  140  with respect to the shaft  110  may urge the piston element  140  further onto the shaft  110  in the direction toward the first end “A” of the tube scraper projectile assembly  100 , increasing a compressive axial force exerted by the piston element  140  on each of the cutting elements  120   a - b  and the first biasing element  130  (e.g., against the stop portion  116  of the shaft  110 ). In some embodiments, the increased compressive axial force may urge the arcuate beams  134 ,  144  further underneath their respectively-paired cutting arms  124   a - b , which in turn causes an increase in the biasing forces exerted by the arcuate beams  134 ,  144  on the cutting arms  124   a - b , thereby urging the cutting tools  126   a - b  further outward radially and/or increasing the resistive force imparted by the cutting tools  126   a - b  on an inside diameter of a tube or pipe (not shown). In some embodiments, the bore  116 - 1  of the shaft  110  may be shaped to receive a tool, e.g., a hex key or “Allen” key (not shown), via which tightening or loosening of the piston element  140  with respect to the shaft  110  may be facilitated. According to some embodiments, such as in the case that indexing feature  118 - 1  and the latch feature  146  are configured as depicted, rotational tightening and/or loosening of the piston element  140  may indexed at a variety of rotational positions. As depicted in  FIG. 1A  and  FIG. 1B , for example, six (6) different latching or indexing positions are provided (e.g., via six (6) different indexing detents comprising the indexing feature  118 - 1 ) at sixty degree (60°) circumferential intervals about the shaft  110 . Advancing the latch feature  146  from one indexing feature  118 - 1  position to the next, in accordance with some embodiments, requires an increased rotational force to urge the latch feature  146  axially away from the shaft  110 . The latch feature  146  may, for example, comprise and/or include a biasing element that is biased toward the shaft  110  and/or is biased toward a default radial position, e.g., as shown, such as with the latch feature  146  fully engaged with or into one of the indexing feature  118 - 1  positions. In such a manner, for example, while the piston element  140  may be selectively indexed to a variety of positions with respect to the shaft  110 , the biasing of the latch feature  146  may provide a rotational resistive force tending to maintain the latch feature  146  engagement with the indexing feature  118 - 1  during operational usage of the tube scraper projectile assembly  100 . 
     In some embodiments, the piston element  140  may comprise a plurality of fins  148 . The fins  148  may, for example, provide physically reactive surfaces facing the second end “B” of the tube scraper projectile assembly  100  such that a fluid propellant may impart movement to the tube scraper projectile assembly  100  by pushing against the fins  148 , e.g., in the case that the tube scraper projectile assembly  100  is inserted into a tube or pipe (not shown). 
     According to some embodiments, any or all of the components  110 ,  116 ,  116 - 1 ,  120   a - b ,  124   a - b ,  126   a - b ,  130 ,  134 ,  140 ,  140 - 1 ,  142 ,  144 ,  146 ,  148  of the tube scraper projectile assembly  100  may be similar in configuration and/or functionality to any similarly named and/or numbered components described herein. Fewer or more components  110 ,  116 ,  116 - 1 ,  120   a - b ,  124   a - b ,  126   a - b ,  130 ,  134 ,  140 ,  140 - 1 ,  142 ,  144 ,  146 ,  148  (and/or portions thereof) and/or various configurations of the components  110 ,  116 ,  116 - 1 ,  120   a - b ,  124   a - b ,  126   a - b ,  130 ,  134 ,  140 ,  140 - 1 ,  142 ,  144 ,  146 ,  148  may be included in the tube scraper projectile assembly  100  without deviating from the scope of embodiments described herein. In some embodiments, one or more of the various components  110 ,  116 ,  116 - 1 ,  120   a - b ,  124   a - b ,  126   a - b ,  130 ,  134 ,  140 ,  140 - 1 ,  142 ,  144 ,  146 ,  148  may not be needed and/or desired in the tube scraper projectile assembly  100 . 
     Referring now to  FIG. 2A  and  FIG. 2B , an upper, back-left perspective view and an upper, front-right perspective view, respectively, of a tube scraper shaft element  210  according to some embodiments are shown. In some embodiments, the tube scraper shaft element  210  may be similar in configuration and/or functionality to the shaft  110  of  FIG. 1A  and  FIG. 1B  herein. According to some embodiments, the tube scraper shaft element  210  may comprise a cylindrical shaft portion  212 , itself comprising a threaded portion  212 - 1 . In some embodiments, the tube scraper shaft element  210  may comprise a shaped portion  214 , such as the hexagonally-shaped shaft portion as depicted. According to some embodiments, the shaped portion  214  may be disposed and/or formed on a portion of the tube scraper shaft element  210  adjacent to a first end (not separately labeled) of the cylindrical shaft portion  212 . According to some embodiments, the threaded portion  212 - 1  may be disposed and/or formed on a second end of the cylindrical shaft portion  212 , e.g., distal from the shaped portion  214 . 
     In some embodiments, the shaped portion  214  may define a plurality of vertices  214 - 1 , such as six (6) vertices  214 - 1  defined as a result of the hexagonal shaped of the shaped portion  214  depicted in  FIG. 2A  and  FIG. 2B . In some embodiments, the purpose of the shaped portion  214  and/or the vertices  214 - 1  may be to engage and/or mate with elements disposed on the tube scraper shaft element  210  (e.g., one or more cutting elements  120   a - b  and/or one or more radial biasing elements  130 , such as described with respect to  FIG. 1A  and  FIG. 1B  herein) such that the rotational forces applied to the tube scraper shaft element  210  may be readily transferred to such engaged and/or mated components (e.g., the tube scraper shaft element  210  may cause elements coupled, mounted, and/or mated to the shaped portion  214  to rotate with the tube scraper shaft element  210 ). Accordingly, in some embodiments, different shapes and/or configurations of the shaped portion  214  and/or vertices  214 - 1  may be utilized to impart motion to components engaged with the tube scraper shaft element  210  (e.g., square shapes, octagonal shapes, keyed and/or dovetailed shapes, a cylindrical shape with a keyway and a key, etc.). 
     According to some embodiments, the tube scraper shaft element  210  may comprise a stop portion  216 , e.g., disposed, coupled, and/or formed on an end of the shaped portion  214  opposite the cylindrical shaft portion  212 . The stop portion  216  may comprise, for example, a portion of the tube scraper shaft element  210  with a diameter greater than each of the shaped portion  214  and the cylindrical shaft portion  212 . In some embodiments, the stop portion  216  may comprise and/or define a stop surface  216 - 1  that is normal to the axis of the tube scraper shaft element  210 . Components mated, coupled, and/or engaged with the shaped portion  214  and/or otherwise disposed on the tube scraper shaft element  210  (e.g., one or more cutting elements  120   a - b  and/or one or more radial biasing elements  130 , such as described with respect to  FIG. 1A  and  FIG. 1B  herein) may, for example, interface with the stop surface  216 - 1 , thereby preventing such elements from sliding off of the end of the tube scraper shaft element  210  at which the stop portion  216  is disposed. According to some embodiments, the stop portion  216  may comprise and/or define a bore  216 - 2 . The bore  216 - 2  may, as depicted for example, be shaped to receive one or more tools such as a hex or “Allen” key which may, for example, facilitate steadying and/or rotation of the tube scraper shaft element  210  when the tube scraper shaft element  210  is mated, via the threaded portion  212 - 1  with threads of another element, device, and/or component (not shown in  FIG. 2A  or  FIG. 2B ; e.g., the piston element  140  of  FIG. 1A  and  FIG. 1B ). 
     In some embodiments, the tube scraper shaft element  210  may comprise an indexing portion  218 . The indexing portion  218  may, for example, be formed and/or disposed at an end of the tube scraper shaft element  210  opposite from the stop portion  216 . According to some embodiments, the indexing portion  218  may comprise one or more indexing and/or detent catch features  218 - 1  and/or a smooth shaft portion  218 - 2 . In some embodiments, the detent catch features  218 - 1  may comprise a plurality of detents arranged around the circumference of the tube scraper shaft element  210  (and/or the indexing portion  218  thereof). As depicted, for example, the detent catch features  218 - 1  may comprise six (6) detent catch features  218 - 1  evenly-spaced around the circumference of the tube scraper shaft element  210  (e.g., on an end thereof that is opposite from the stop portion  216 ). In some embodiments, the detent catch features  218 - 1  may comprise a plurality of cuneate impressions in the shaft circumference, such that each detent catch feature  218 - 1  is operable to be engaged and/or mate with a detent latch feature (not shown in  FIG. 2A  or  FIG. 2B ; e.g., the detent latch feature  146  of the piston element  140  of  FIG. 1A  and  FIG. 1B  herein) comprising a cuneal projection. While six (6) detent catch features  218 - 1  spaced at sixty degree (60°) circumferential intervals about the tube scraper shaft element  210  (and/or the indexing portion  218  thereof) are depicted, other quantities and/or configurations of detent catch features  218 - 1  may be utilized in some embodiments. The detent catch features  218 - 1  may comprise one or more detents, channels, keys, projections, tabs, and/or other objects or voids, for example, configured to engage with a corresponding one or more compatible features of an element (not shown in  FIG. 2A  or  FIG. 2B ; e.g., the piston element  140  of  FIG. 1A  and  FIG. 1B ) mated, coupled, and/or engaged with and/or otherwise disposed on the tube scraper shaft element  210 . 
     According to some embodiments, any or all of the components  212 ,  212 - 1 ,  214 ,  214 - 1 ,  216 ,  216 - 1 ,  216 - 2 ,  218 ,  218 - 1 ,  218 - 2  of the tube scraper shaft element  210  may be similar in configuration and/or functionality to any similarly named and/or numbered components described herein. Fewer or more components  212 ,  212 - 1 ,  214 ,  214 - 1 ,  216 ,  216 - 1 ,  216 - 2 ,  218 ,  218 - 1 ,  218 - 2  (and/or portions thereof) and/or various configurations of the components  212 ,  212 - 1 ,  214 ,  214 - 1 ,  216 ,  216 - 1 ,  216 - 2 ,  218 ,  218 - 1 ,  218 - 2  may be included in the tube scraper shaft element  210  without deviating from the scope of embodiments described herein. In some embodiments, one or more of the various components  212 ,  212 - 1 ,  214 ,  214 - 1 ,  216 ,  216 - 1 ,  216 - 2 ,  218 ,  218 - 1 ,  218 - 2  may not be needed and/or desired in the tube scraper shaft element  210 . 
     Turning now to  FIG. 3A  and  FIG. 3B , an upper, back-left perspective view and an upper, front-right perspective view, respectively, of a tube scraper blade element  320  according to some embodiments are shown. In some embodiments, the tube scraper blade element  320  may be similar in configuration and/or functionality to either or both of the cutting elements  120   a - b  of  FIG. 1A  and  FIG. 1B  herein. In some embodiments, the tube scraper blade element  320  may comprise a generally cylindrically-shaped, hollow element, defining an interior volume or void  320 - 1 . The tube scraper blade element  320  may comprise, for example, a base portion  322  of the cylinder-shape at one end of the tube scraper blade element  320 , with the other end being open, and the interior void  320 - 1  being disposed in between. 
     According to some embodiments, the base portion  322  may comprise a circular and/or disc-shaped element. In some embodiments, the base portion  322  may be referred to as an annular base  322  or an annular cutting element base  322 . The base element  322  may, for example, comprise a circular and/or disc-shaped element defining an orifice  322 - 1  there through. In some embodiments, the orifice  322 - 1  may be circularly-shaped to define a ‘true’ annular base  322 . According to some embodiments, the orifice  322 - 1  may alternatively be shaped, such as the hexagonal shaped orifice  322 - 1  depicted in  FIG. 3A  and  FIG. 3B . In such cases, the base portion  322  may still be referred to as an annular base  322 , for convenience. According to some embodiments, the orifice  322 - 1  may be shaped to engage and/or mate with a shaft (not shown in  FIG. 3A  or  FIG. 3B ; e.g., the tube scraper shaft element  210  (and/or the shaped portion  214  thereof). 
     In some embodiments, the tube scraper blade element  320  may comprise a plurality of scrapper or cutting arms  324  extending from an outer diameter of the annular base  322  longitudinally along the cylinder shape and/or defining the walls of the cylinder shape. The plurality of cutting arms  324  may, for example, define the radial extents of the interior void  320 - 1 . As depicted in  FIG. 3A  and  FIG. 3B , in some embodiments the cutting arms  324  may be formed from a cylindrical wall of the tube scraper blade element  320  being cut, formed, and/or separated, into a plurality of independent longitudinal elements. In some embodiments, such independent longitudinal cutting arms  324  may comprise pliable and/or elastic elements—e.g., that are receptive to receiving a radial biasing force to urge the cutting arms  324  radially from their default cylindrically-shaped positions, e.g., to pivot at their attachment to the annular base  322 . According to some embodiments (as depicted), the tube scraper blade element  320  may comprise and/or define six (6) cutting arms  324  (a first cutting arm  324 - 1 , a second cutting arm  324 - 2 , a third cutting arm  324 - 3 , a fourth cutting arm  324 - 4 , a fifth cutting arm  324 - 5 , and/or a sixth cutting arm  324 - 6 ). 
     According to some embodiments, each cutting arm  324  may comprise a scrapper or cutting element or tool  326 . The cutting tools  326  may, for example, comprise portions of the cutting arms  324  angled radially outward from the basic cylindrical shape defined by the cutting arms  324 . In some embodiments, the cutting tools  326  may be oriented normal to a cylindrical axis (not explicitly shown in  FIG. 3A  or  FIG. 3B ) of the tube scraper blade element  320 . In such a manner, for example, in the case that the tube scraper blade element  320  is inserted into a closed conduit (not shown) such as a pipe or tube (e.g., a chiller tube), the cutting tools  326  may be disposed to scrape or cut deposits formed on the inside surface of the closed conduit. In some embodiments, the cutting tools  326  may be angled and/or bent at an angle of less than ninety degrees (90°) with respect to the cutting arms  324 . In some embodiments, different cutting tools  326  may be angled and/or disposed differently with respect to other cutting tools  326 . According to some embodiments, such as in the case that the tube scraper blade element  320  comprises and/or defines six (6) cutting arms  324 , the tube scraper blade element  320  may accordingly comprise six (6) cutting tools  326  (a first cutting tool  326 - 1 , a second cutting tool  326 - 2 , a third cutting tool  326 - 3 , a fourth cutting tool  326 - 4 , a fifth cutting tool  326 - 5 , and/or a sixth cutting tool  326 - 6 ). In some embodiments, instead of being formed from bent/angled portions of the cutting arms  324  as shown, the cutting tools  326  may be coupled to the cutting arms  324  (e.g., welded, screwed, adhered to, and/or otherwise attached). 
     According to some embodiments, any or all of the components  320 - 1 ,  322 ,  322 - 1 ,  324 - 1 ,  324 - 2 ,  324 - 3 ,  324 - 4 ,  324 - 5 ,  324 - 6 ,  326 - 1 ,  326 - 2 ,  326 - 3 ,  326 - 4 ,  326 - 5 ,  326 - 6  of the tube scraper blade element  320  may be similar in configuration and/or functionality to any similarly named and/or numbered components described herein. Fewer or more components  320 - 1 ,  322 ,  322 - 1 ,  324 - 1 ,  324 - 2 ,  324 - 3 ,  324 - 4 ,  324 - 5 ,  324 - 6 ,  326 - 1 ,  326 - 2 ,  326 - 3 ,  326 - 4 ,  326 - 5 ,  326 - 6  (and/or portions thereof) and/or various configurations of the components  320 - 1 ,  322 ,  322 - 1 ,  324 - 1 ,  324 - 2 ,  324 - 3 ,  324 - 4 ,  324 - 5 ,  324 - 6 ,  326 - 1 ,  326 - 2 ,  326 - 3 ,  326 - 4 ,  326 - 5 ,  326 - 6  may be included in the tube scraper blade element  320  without deviating from the scope of embodiments described herein. In some embodiments, one or more of the various components  320 - 1 ,  322 ,  322 - 1 ,  324 - 1 ,  324 - 2 ,  324 - 3 ,  324 - 4 ,  324 - 5 ,  324 - 6 ,  326 - 1 ,  326 - 2 ,  326 - 3 ,  326 - 4 ,  326 - 5 ,  326 - 6  may not be needed and/or desired in the tube scraper blade element  320 . 
     Referring now to  FIG. 4A  and  FIG. 4B , an upper, back-left perspective view and an upper, front-right perspective view, respectively, of a tube scraper biasing element  430  according to some embodiments are shown. In some embodiments, the tube scraper biasing element  430  may be similar in configuration and/or functionality to either or both of the biasing elements  130 ,  142  of  FIG. 1A  and  FIG. 1B  herein. In some embodiments, the tube scraper biasing element  430  may comprise a generally barrel-shaped (e.g., a hollow cylindrical shaped that is convex along the sides) element, defining an interior volume or void  430 - 1 . The tube scraper biasing element  430  may comprise, for example, a base portion  432  of the barrel-shape at one end of the tube scraper biasing element  430 , with the other end being open, and the interior void  430 - 1  being disposed in between. In some embodiments (not shown), the tube scraper biasing element  430  generally comprise a cylindrically-shaped, hollow element, e.g., defining the interior void  430 - 1 . 
     According to some embodiments, the base portion  432  may comprise a circular and/or disc-shaped element. In some embodiments, the base portion  432  may be referred to as an annular base  432  or an annular biasing element base  432 . The base element  432  may, for example, comprise a circular and/or disc-shaped element defining an orifice  432 - 1  there through. In some embodiments (as shown), the orifice  432 - 1  may be circularly-shaped to define a ‘true’ annular base  432 . According to some embodiments, the orifice  432 - 1  may alternatively be shaped, such as hexagonally or octagonally shaped. In such cases, the base portion  432  may still be referred to as an annular base  432 , for convenience. According to some embodiments, the orifice  432 - 1  may be shaped to engage and/or mate with a shaft (not shown in  FIG. 4A  or  FIG. 4B ; e.g., the tube scraper shaft element  210  (and/or the shaped portion  214  thereof). The orifice  432 - 1  and/or the annular base  432  may comprise, for example, a plurality of engagement detents  432 - 2 , as depicted in  FIG. 4A  and  FIG. 4B . The engagement detents  432 - 2  may, for example, be formed to receive vertices and/or projections of a shaft (e.g., the vertices  214 - 1  of the shaped portion  214  of the shaft  210  of  FIG. 2A  and  FIG. 2B  herein) such that rotation of the shaft imparts rotational force to the tube scraper biasing element  430 . 
     In some embodiments, the tube scraper biasing element  430  may comprise a plurality of arcuate arms or beams  434  extending from an outer diameter of the annular base  432  longitudinally along the barrel/convex shape and/or defining the walls of the barrel/convex shape. The plurality of arcuate beams  434  may, for example, define the radial extents of the interior void  430 - 1 . As depicted in  FIG. 4A  and  FIG. 4B , in some embodiments the arcuate beams  434  may be formed from a barrel/convex wall of the tube scraper biasing element  430  being cut, formed, and/or separated, into a plurality of independent longitudinal elements. In some embodiments, such independent longitudinal arcuate beams  434  may comprise elastic and/or pliable elements—e.g., that are receptive to receiving and/or providing a radial biasing force to urge the arcuate beams  434  radially from their default barrel-shaped positions, e.g., to pivot at their attachment to the annular base  432 . In some embodiments, the convex shape of the arcuate beams  434  may also provide an axial biasing feature to the arcuate beams  434  such that pressure applied axially to the arcuate beams  434  is elastically resisted by the arcuate beams  434 . In some embodiments (not shown), the beams  434  may (e.g., instead of or in addition to being arcuate) comprise straight arm/beam elements. In some embodiments, such straight arm/beam elements may comprise a tapered thickness—e.g., thickness decreases as the extents of the beams are approached, e.g., in a linear fashion in some embodiments. Such a tapered and/or non-biasing beam configuration may, for example, provide varying resistance to forces applied (e.g., radially inward) to any cutting arms (not shown in  FIG. 4A  or  FIG. 4B ) that the beams are paired with (e.g., as described herein) and/or support. In the case that a tapered beam is interfaced with a cutting arm near the tip of the beam where the thickness is relatively small, for example, resistance to bending is also small and a relatively small amount of resistance to cutting arm deflection may be provided. In the case the tapered beam is interfaced with the cutting arm away from the tip of the beam (e.g., mid-way along the beam or proximate to the base of the beam) where the thickness is relatively large, for example, resistance to bending is also large and a relatively large amount of resistance to cutting arm deflection may be provided. Such may also be the case where a straight, uniform thickness beam is utilized, but the varying resistive force/effect will be less pronounced than with a tapered beam thickness being employed. In either case, for example, a tapered-thickness and/or uniform thickness non-arcuate beam  434  may be provided and selectively inserted into a cutting arm void (as described herein) to vary a radial resistive force provided by the tapered-thickness and/or uniform thickness non-arcuate beam  434 . 
     According to some embodiments (as depicted), the tube scraper biasing element  430  may comprise and/or define six (6) arcuate beams  434  (a first arcuate beam  434 - 1 , a second arcuate beam  434 - 2 , a third arcuate beam  434 - 3 , a fourth arcuate beam  434 - 4 , a fifth arcuate beam  434 - 5 , and/or a sixth arcuate beam  434 - 6 ). According to some embodiments, each of the arcuate beams  434  may be oriented to apply a biasing force to (and/or to receive a biasing force from) a cutting arm (not shown in  FIG. 4A  and  FIG. 4B ; e.g., the cutting arms  324  of the tube scraper blade element  320  of  FIG. 3A  and  FIG. 3B  herein). The arcuate beams  434  may, for example, be inserted, fitted, and/or forced into an internal void defined by a plurality of cutting arms (not shown in  FIG. 4A  and  FIG. 4B ; e.g., the internal void  320 - 1  of the tube scraper blade element  320  of  FIG. 3A  and  FIG. 3B  herein). In such embodiments, the further the arcuate beams  434  are inserted into such a void (e.g., the further the arcuate beams  434  are urged to interfere and/or interface with the undersides of the respective cutting arms), the more outward radial biasing pressure is exerted on the cutting arms by the arcuate beams  434 , with a maximum radial biasing pressure being exerted, for example, upon engagement of the apex of the convex shape of an arcuate beam  434  with a respective force-receiving surface of a pliable and/or elastic cutting arm member. 
     According to some embodiments, any or all of the components  430 - 1 ,  432 ,  432 - 1 ,  434 - 1 ,  434 - 2 ,  434 - 3 ,  434 - 4 ,  434 - 5 ,  434 - 6  of the tube scraper biasing element  430  may be similar in configuration and/or functionality to any similarly named and/or numbered components described herein. Fewer or more components  430 - 1 ,  432 ,  432 - 1 ,  434 - 1 ,  434 - 2 ,  434 - 3 ,  434 - 4 ,  434 - 5 ,  434 - 6  (and/or portions thereof) and/or various configurations of the components  430 - 1 ,  432 ,  432 - 1 ,  434 - 1 ,  434 - 2 ,  434 - 3 ,  434 - 4 ,  434 - 5 ,  434 - 6  may be included in the tube scraper biasing element  430  without deviating from the scope of embodiments described herein. In some embodiments, one or more of the various components  430 - 1 ,  432 ,  432 - 1 ,  434 - 1 ,  434 - 2 ,  434 - 3 ,  434 - 4 ,  434 - 5 ,  434 - 6  may not be needed and/or desired in the tube scraper biasing element  430 . 
     Referring now to  FIG. 5A  and  FIG. 5B , an upper, back-left perspective view and an upper, front-right perspective view, respectively, of a tube scraper piston element  540  according to some embodiments are shown. In some embodiments, the tube scraper piston element  540  may be similar in configuration and/or functionality to the piston element  140  of  FIG. 1A  and  FIG. 1B  herein. In some embodiments, the tube scraper piston element  540  may be disposed along an axis and be identifiable as having a first end “A” and a second end “B”, as shown. In some embodiments, the tube scraper piston element  540  may comprise a body portion  540 - 1  that is generally cylindrically shaped. According to some embodiments, the body portion  540 - 1  may be hollow and/or may otherwise comprise and/or define a bore  540 - 2  there through. According to some embodiments, the bore  540 - 2  (and/or the inside diameter of the body element  540 - 1 ) may comprise a threaded portion  540 - 3 . The interior threaded portion  540 - 3  may be operable to accept, for example, mating threads of a shaft (not shown in  FIG. 5A  or  FIG. 5B ; e.g., the threaded portion  212 - 1  of the shaft  210  of  FIG. 2A  and  FIG. 2B  herein) inserted into the bore  540 - 2 . 
     In some embodiments, the tube scraper piston element  540  may comprise a biasing element  542  formed at and/or coupled to one end of the body portion  540 - 1  proximate to the first end “A” of the tube scraper piston element  540 . The biasing element  542  may, in some embodiments, comprise a generally barrel-shaped (e.g., a hollow cylindrical shaped that is convex along the sides) portion, defining a portion of the bore  540 - 2  and/or an interior volume or void at least partially defined by the bore  540 - 2 . The biasing element  542  may comprise, for example, a plurality of arcuate arms or beams  544  extending from an outer diameter of the body portion  540 - 1  and extending longitudinally along the barrel/convex shape and/or defining the walls of the barrel/convex shape, e.g., along the axis toward the first end “A” of the tube scraper piston element  540 . As depicted in  FIG. 5A  and  FIG. 5B , in some embodiments the arcuate beams  544  may be formed from a barrel/convex wall of the biasing element  542  being cut, formed, and/or separated, into a plurality of independent longitudinal elements. In some embodiments, such independent longitudinal arcuate beams  544  may comprise elastic and/or pliable elements—e.g., that are receptive to receiving and/or providing a radial biasing force to urge the arcuate beams  544  radially from their default barrel-shaped positions, e.g., to pivot at their attachment to the body portion  540 - 1 . In some embodiments, the convex shape of the arcuate beams  544  may also provide an axial biasing feature to the arcuate beams  544  such that pressure applied axially to the arcuate beams  544  is elastically resisted by the arcuate beams  544 . 
     According to some embodiments (as depicted), the biasing element  542  may comprise and/or define six (6) arcuate beams  544  (a first arcuate beam  544 - 1 , a second arcuate beam  544 - 2 , a third arcuate beam  544 - 3 , a fourth arcuate beam  544 - 4 , a fifth arcuate beam  544 - 5 , and/or a sixth arcuate beam  544 - 6 ). According to some embodiments, each of the arcuate beams  544  may be oriented to apply a biasing force to (and/or to receive a biasing force from) a cutting arm (not shown in  FIG. 5A  and  FIG. 5B ; e.g., the cutting arms  324  of the tube scraper blade element  320  of  FIG. 3A  and  FIG. 3B  herein). The arcuate beams  544  may, for example, be inserted, fitted, and/or forced into an internal void defined by a plurality of cutting arms (not shown in  FIG. 5A  and  FIG. 5B ; e.g., the internal void  320 - 1  of the tube scraper blade element  320  of  FIG. 3A  and  FIG. 3B  herein). In such embodiments, the further the arcuate beams  544  are inserted into such a void (e.g., the further the arcuate beams  544  are urged to interfere and/or interface with the undersides of the respective cutting arms), the more outward radial biasing pressure is exerted on the cutting arms by the arcuate beams  544 , with a maximum radial biasing pressure being exerted, for example, upon engagement of the apex of the convex shape of an arcuate beam  544  with a respective force-receiving surface of a pliable and/or elastic cutting arm member. 
     In some embodiments, the tube scraper piston element  540  may comprise a latch feature  546 . The latch feature  546  may, for example, comprise an elastic and/or pliable portion of the tube scraper piston element  540  at the second end “B” thereof. As depicted, the latch portion  546  may comprise a portion of the cylindrically-shaped body portion  540 - 1  that is formed and/or cut separately, for a portion of the circumference thereof (e.g., for approximately sixty degrees (60°) radially of the entire cylindrical shape of the body portion  540 - 1 ). According to some embodiments, the latch feature  546  may comprise a projection  546 - 1  shaped to be received by and/or mated with a catch feature of a shaft (not shown in  FIG. 5A  and  FIG. 5B ; e.g., the detent catch feature  218 - 1  of the shaft  210  of  FIG. 2A  and  FIG. 2B  herein). As depicted, for example, the projection  546 - 1  may comprise a cuneal projection  546 - 1  operable to be received by a cuneate detent of a shaft inserted through the bore  540 - 2 . In such a case, the latch feature  546  may be referred to as a detent latch feature  546 . While the latch feature  546  is shown as comprising the projection  546 - 1 , in some embodiments other shapes and/or configurations of features may also or alternatively be provided—such as a detent (not shown) to accept a projection from a shaft (also not shown). 
     According to some embodiments, the tube scraper piston element  540  may comprise a plurality of fins  548  extending (e.g., longitudinally) from an outer diameter of the body portion  540 - 1  proximate to the second end “B” of the tube scraper piston element  540  (e.g., opposite from the biasing element  542 ). In some embodiments, the plurality of fins  548  may be angled toward the second end “B” of the tube scraper piston element  540 , thereby defining a frusto conical void  540 - 4  at the second end “B”. The frusto conical void  540 - 4  may, for example, be operable to accept pressurized fluid flow (not shown) and thereby relay an axial pushing force from the pressurized fluid flow (e.g., in the direction of the first end “A”) to the tube scraper piston element  540 . 
     In some embodiments (as depicted), the tube scraper piston element  540  may comprise and/or define six (6) fins  548  (a first fin  548 - 1 , a second fin  548 - 2 , a third fin  548 - 3 , a fourth fin  548 - 4 , a fifth fin  548 - 5 , and/or a sixth fin  548 - 6 ). According to some embodiments, each of the fins  548  may be oriented to accept a fluid force at a circumferential position about the tube scraper piston element  540  that aligns with a circumferential position of one of the arcuate beams  544 - 1 ,  544 - 2 ,  544 - 3 ,  544 - 4 ,  544 - 5 ,  544 - 6 . 
     According to some embodiments, any or all of the components  540 - 1 ,  540 - 2 ,  540 - 3 ,  540 - 4 ,  542 ,  544 - 1 ,  544 - 2 ,  544 - 3 ,  544 - 4 ,  544 - 5 ,  544 - 6 ,  546 ,  546 - 1 ,  548 - 1 ,  548 - 2 ,  548 - 3 ,  548 - 4 ,  548 - 5 ,  548 - 6  of the tube scraper piston element  540  may be similar in configuration and/or functionality to any similarly named and/or numbered components described herein. Fewer or more components  540 - 1 ,  540 - 2 ,  540 - 3 ,  540 - 4 ,  542 ,  544 - 1 ,  544 - 2 ,  544 - 3 ,  544 - 4 ,  544 - 5 ,  544 - 6 ,  546 ,  546 - 1 ,  548 - 1 ,  548 - 2 ,  548 - 3 ,  548 - 4 ,  548 - 5 ,  548 - 6  (and/or portions thereof) and/or various configurations of the components  540 - 1 ,  540 - 2 ,  540 - 3 ,  540 - 4 ,  542 ,  544 - 1 ,  544 - 2 ,  544 - 3 ,  544 - 4 ,  544 - 5 ,  544 - 6 ,  546 ,  546 - 1 ,  548 - 1 ,  548 - 2 ,  548 - 3 ,  548 - 4 ,  548 - 5 ,  548 - 6  may be included in the tube scraper piston element  540  without deviating from the scope of embodiments described herein. In some embodiments, one or more of the various components  540 - 1 ,  540 - 2 ,  540 - 3 ,  540 - 4 ,  542 ,  544 - 1 ,  544 - 2 ,  544 - 3 ,  544 - 4 ,  544 - 5 ,  544 - 6 ,  546 ,  546 - 1 ,  548 - 1 ,  548 - 2 ,  548 - 3 ,  548 - 4 ,  548 - 5 ,  548 - 6  may not be needed and/or desired in the tube scraper piston element  540 . 
     Turning now to  FIG. 6 , an upper, back-left perspective assembly view of a tube scraper projectile assembly  600  according to some embodiments is shown. In some embodiments, the tube scraper projectile assembly  600  may comprise a shaft  610  comprising a cylindrical shaft portion  612 , a threaded portion  612 - 1 , a shaped shaft portion  614 , shaped shaft vertices  614 - 1 , a stop portion  616 , a stop surface  616 - 1 , an indexing portion  618 , a plurality of indexing features  618 - 1 , and/or a smooth shaft portion  618 - 2 . In some embodiments, the tube scraper projectile assembly  600  may comprise a plurality of cutting elements  620   a - b  mounted to, coupled to, seated on, and/or otherwise disposed on the shaft  610 . The cutting elements  620   a - b  may define interior volumes or voids  620   a - 1 ,  620   b - 1  and/or may comprise, for example, base portions  622   a - b  defining orifices  622   a - 1 ,  622   b - 1 , and/or a plurality of cutting arms  624   a - b , each cutting arm  624   a - b  comprising a scrapping or cutting tool  626   a - b . According to some embodiments, a first cutting element  620   a  may inserted onto the shaft  610  with a first cutting element base portion  622   a  thereof engaging with the stop surface  616 - 1 . A first shaped orifice  622   a - 1  of the first cutting element  620   a  may, for example, be inserted onto the shaped portion  614  of the shaft  610 , thereby engaging the first cutting element  620   a  with the shaft  610 . 
     In some embodiments, the tube scraper projectile assembly  600  may comprise a first biasing element  630 . The first biasing element  630  may define an interior volume or void  630 - 1  and/or may comprise, for example, a base portion  632  defining an orifice  632 - 1  and/or a plurality of arcuate beams  634  extending longitudinally/axially from an outer diameter of the base portion  632 . According to some embodiments, the first biasing element  630  may be inserted onto the shaft  610  with the arcuate beams  634  extending into a first interior void  620   a - 1  of the first cutting element  620   a  (e.g., the arcuate beams  634  may be nested with or underneath first cutting arms  624   a  of the first cutting element  620   a ). In some embodiments, a second cutting element  620   b  may be inserted onto the shaft  610  with a second cutting element base  622   b  thereof contacting (and/or mating or coupling with) the base portion  632  of the first biasing element  630 . In some embodiments, a second shaped orifice  622   b - 1  of the second cutting element  620   b  may, for example, be inserted onto the shaped portion  614  of the shaft  610 , thereby engaging the second cutting element  620   b  with the shaft  610 . While the second cutting element  620   b  and the first biasing element  630  are depicted as being separate elements in  FIG. 6 , in some embodiments they may be provided as coupled or joined elements or as a single element, as is or becomes desirable or practicable. 
     According to some embodiments, the tube scraper projectile assembly  600  may comprise a piston element  640 . The piston element  640  may comprise a body portion  640 - 1  having a bore  640 - 2 , for example, and/or may comprise a second biasing element  642  having a plurality of arcuate beams  644 , a latch feature  646  having a latch projection  646 - 1 , and/or a plurality of fins  648  defining a propellant void  640 - 4 . While the second biasing element  642  is depicted as being integral to and/or part of the piston element  640 , in some embodiments the second biasing element  642  may comprise a separate element than the piston element  640 . 
     In some embodiments, the piston element  640  may be inserted onto and/or engaged with the shaft  610 . The arcuate beams  644  of the second biasing portion  642  may, for example, be extended into a second interior void  620   b - 1  of the second cutting element  620   b  (e.g., the arcuate beams  644  may be nested with or underneath second cutting arms  624   b  of the second cutting element  620   b ) and/or the piston element  640  (and/or the body portion  640 - 1  thereof) may be rotationally engaged and/or coupled to the shaft  610  such as by engaging with the threaded portion  612 - 1  thereof (e.g., via an interior threaded portion of the bore  640 - 2 , which is not visible in  FIG. 6 ). According to some embodiments, the latch feature  646  and/or the latch projection  646 - 1  thereof may engage and/or mate with the one of the plurality of indexing features  618 - 1  of the indexing portion  618  of the shaft  610 . 
     In the case that the piston element  640  is coupled to the shaft  610  via threads, a clock-wise (right-turn) rotational engagement of the piston element  640  with respect to the shaft  610  may urge the piston element  640  further onto the shaft  610  in the direction toward the stop portion  616 , increasing a compressive axial force exerted by the piston element  640  on each of the cutting elements  620   a - b  and the biasing elements  630 ,  642  (e.g., against the stop surface  616 - 1  of the shaft  610 ). In some embodiments, the increased compressive axial force may urge the arcuate beams  634 ,  644  further underneath their respectively-paired cutting arms  624   a - b , which in turn causes an increase in the biasing forces exerted by the arcuate beams  634 ,  644  on the cutting arms  624   a - b , thereby urging the cutting tools  626   a - b  further outward radially and/or increasing the resistive force imparted by the cutting tools  626   a - b  on an inside diameter of a tube or pipe (not shown). According to some embodiments, rotational tightening and/or loosening of the piston element  640  may be indexed at a variety of rotational positions. As depicted in  FIG. 6 , for example, six (6) different latching or indexing positions are provided (e.g., via six (6) different indexing detents comprising the indexing features  618 - 1 ) at sixty degree (60°) circumferential intervals about the shaft  610 . Advancing the latch feature  646  from one indexing feature  618 - 1  position to the next, in accordance with some embodiments, requires an increased rotational force to urge the latch feature  646  axially away from the shaft  610 . The latch feature  646  may, for example, comprise and/or include a biasing element that is biased toward the shaft  610  and/or is biased toward a default radial position, e.g., as shown, such as with the latch feature  646  fully engaged with or into one of the indexing feature  618 - 1  positions. In such a manner, for example, while the piston element  640  may be selectively indexed to a variety of positions with respect to the shaft  610  (each position corresponding to a particular biasing force setting or level), the biasing of the latch feature  646  may provide a rotational resistive force tending to maintain the latch feature  646  engagement with the indexing feature  618 - 1  during operational usage of the tube scraper projectile assembly  600 . 
     In some embodiments, the tube scraper projectile assembly  600  may be selectively indexed to a particular desired biasing force by selective engagement of the latch feature  646  with a particular one of the indexing features  618 - 1  (and/or circumferential position thereof). The piston element  640  may be tightened onto the shaft  610 , for example, until the latch feature  646  engages with the desired particular one of the indexing features  618 - 1 . According to some embodiments, the tube scraper projectile assembly  600  may then be inserted into a tube, pipe, or other closed conduit (not shown) and propelled through the conduit via application of fluid (e.g., air, water) into the propellant void  640 - 4  and acting upon the fins  648 . In such a manner, for example, deposits within the conduit may be scrapped, cut, dislodged, and/or otherwise removed from the interior of the conduit. 
     According to some embodiments, any or all of the components  610 ,  612 ,  612 - 1 ,  614 ,  614 - 1 ,  616 ,  616 - 1 ,  618 ,  618 - 1 ,  618 - 2 ,  620   a - b ,  620   a - 1 ,  620   b - 1 ,  622   a - b ,  622   a - 1 ,  622   b - 1 ,  624   a - b ,  626   a - b ,  630 ,  630 - 1 ,  632 ,  632 - 1 ,  634 ,  640 ,  640 - 1 ,  640 - 2 ,  640 - 4 ,  642 ,  644 ,  646 ,  646 - 1 ,  648  of the tube scraper projectile assembly  600  may be similar in configuration and/or functionality to any similarly named and/or numbered components described herein. Fewer or more components  610 ,  612 ,  612 - 1 ,  614 ,  614 - 1 ,  616 ,  616 - 1 ,  618 ,  618 - 1 ,  618 - 2 ,  620   a - b ,  620   a - 1 ,  620   b - 1 ,  622   a - b ,  622   a - 1 ,  622   b - 1 ,  624   a - b ,  626   a - b ,  630 ,  630 - 1 ,  632 ,  632 - 1 ,  634 ,  640 ,  640 - 1 ,  640 - 2 ,  640 - 4 ,  642 ,  644 ,  646 ,  646 - 1 ,  648  (and/or portions thereof) and/or various configurations of the components  610 ,  612 ,  612 - 1 ,  614 ,  614 - 1 ,  616 ,  616 - 1 ,  618 ,  618 - 1 ,  618 - 2 ,  620   a - b ,  620   a - 1 ,  620   b - 1 ,  622   a - b ,  622   a - 1 ,  622   b - 1 ,  624   a - b ,  626   a - b ,  630 ,  630 - 1 ,  632 ,  632 - 1 ,  634 ,  640 ,  640 - 1 ,  640 - 2 ,  640 - 4 ,  642 ,  644 ,  646 ,  646 - 1 ,  648  may be included in the tube scraper projectile assembly  600  without deviating from the scope of embodiments described herein. In some embodiments, one or more of the various components  610 ,  612 ,  612 - 1 ,  614 ,  614 - 1 ,  616 ,  616 - 1 ,  618 ,  618 - 1 ,  618 - 2 ,  620   a - b ,  620   a - 1 ,  620   b - 1 ,  622   a - b ,  622   a - 1 ,  622   b - 1 ,  624   a - b ,  626   a - b ,  630 ,  630 - 1 ,  632 ,  632 - 1 ,  634 ,  640 ,  640 - 1 ,  640 - 2 ,  640 - 4 ,  642 ,  644 ,  646 ,  646 - 1 ,  648  may not be needed and/or desired in the tube scraper projectile assembly  600 . 
     III. Conclusion 
     The present disclosure provides, to one of ordinary skill in the art, an enabling description of several embodiments and/or inventions. Some of these embodiments and/or inventions may not be claimed in the present application, but may nevertheless be claimed in one or more continuing applications that claim the benefit of priority of the present application. Applicant(s) reserves the right to file additional applications to pursue patents for subject matter that has been disclosed and enabled, but not claimed in the present application.