Patent Publication Number: US-2021189307-A1

Title: Oval-Shaped Metal Tank Systems

Description:
BACKGROUND 
     Wine fermentation tanks formed of concrete exist that have an egg shape to help create a torus shaped vortex of fermenting wine. For example, egg-shaped concrete fermentation tanks exist that utilize the heat produced from fermenting wine to help convect the wine in a torus shaped vortex. However, because these egg-shaped fermentation tanks are formed of concrete, these tanks are extremely heavy, difficult to produce in large sizes, problematic to incorporate auxiliary wine fermentation components (e.g., manways, fittings, plumping, etc.), and incapable of being cleaned. Thus, these concrete tanks are labor intensive, time consuming, difficult to clean, and costly. Moreover, because these concrete tanks are incapable of being cleaned, they are susceptible to “pinking” a white wine. For example, a white wine being produced in concrete tanks subsequent to producing a red wine is susceptible to having a discolored appearance (e.g., a blush color, a red blush color, etc.) or “pinking” that may be perceived as undesirable for winemakers and/or consumers. 
     Accordingly, there remains a need in the art for a tank that creates a torus shaped vortex of fermenting wine that is light weight, easily produced, less labor intensive to clean, and inexpensive. 
     SUMMARY 
     Fermentation tanks are configured to produce wine. Generally, the tanks include a metal cone-shaped wall attached between a metal top dome (e.g., a top head) and a metal bottom dome (e.g., a bottom head) that has an oval-shape (e.g., egg shape) void of angled corners on the inside surface of the tanks. When a product (e.g., wine, red wine, white wine, etc.) is displaced in the oval-shaped metal tank, the product is displaced in a torus shaped vortex between the top dome and the bottom dome. This summary is provided to introduce simplified concepts of oval-shaped metal tanks and a method of making oval-shaped metal tanks, which is further described below in the Detailed Description. This summary is not intended to identify essential features of the claimed subject matter, nor is it intended for use in determining the scope of the claimed subject matter. 
     In an embodiment, a tank includes a cone-shaped wall formed of a steel having a top perimeter attached to a perimeter of a first dome-shaped surface formed of the steel and a bottom perimeter attached to a perimeter of a second shaped surface formed of the steel. The cone-shaped wall attached to the first dome-shaped surface and the second domed shaped surface defining an oval-shape that is void of angled corners on the inside surface of the tank such that when a product contained in the tank is displaced, the product is displaced in a torus shaped vortex between the first dome-shaped surface and the second dome-shaped surface. 
     In an embodiment, a tank includes a first wall portion formed of a steel attached to a second wall portion formed of the steel, wherein the first wall portion attached to the second wall portion define a seam having an elliptical shape. The tank also includes a first dome-shaped surface being formed of the steel and a second domed shaped surface being formed of the steel. The first domed shaped surface being attached to a top perimeter of the first wall portion and the second domed shaped surface being attached to a bottom perimeter of the second wall portion. The first wall portion attached to the first dome-shaped surface and the second wall portion attached to the second dome-shaped surface defining an oval-shape void of angled corners on the inside surface of tank such when a product contained in the tank is displaced, the product is displaced in a torus shaped vortex between the first dome-shaped surface and the second dome-shaped surface. 
     In an embodiment, a tank includes a cone-shaped wall formed of a steel and attached between a first dome-shaped surface formed of the steel and a second dome-shaped surface formed of the steel. The cone-shaped wall attached between the first dome-shaped surface and the second dome-shaped surface defining an oval-shape void of angled corners on the inside surface of tank such that when a product contained in the tank is displaced, the product is displaced in a torus shaped vortex between the first dome-shaped surface and the second dome-shaped surface. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The detailed description is set forth with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The use of the same reference numbers in different figures indicates similar or identical items. 
         FIG. 1  illustrates a front, top, right-side perspective view of a tank according to an embodiment of this disclosure. 
         FIG. 2  illustrates a back, top, left-side perspective view of the tank shown in  FIG. 1 . 
         FIG. 3  illustrates a transparent view of the tank shown in  FIG. 1  to depict a product being displaced in a torus shaped vortex within the tank. 
         FIG. 4  illustrates a planar view of an example first wall portion of the tank shown in  FIG. 1 . 
         FIG. 5  illustrates a planar view of an example second wall portion of the tank shown in  FIG. 1 . 
         FIG. 6  illustrates a planar view of an example cooling jacket of the tank shown in  FIG. 1 . 
         FIG. 7  illustrates a planar view of an example cone-shaped wall assembly including the first wall portion, the second wall portion, and the cooling jack shown in  FIGS. 4, 5, and 6 . 
         FIG. 8  illustrates a side view of an example first dome-shaped surface shown in  FIG. 1 . 
         FIG. 9  illustrates a side view of an example second dome-shaped surface shown in  FIG. 1 . 
         FIGS. 10A-B  collectively illustrate a flow diagram illustrating an example process of making the tank shown in  FIG. 1 . 
     
    
    
     DETAILED DESCRIPTION 
     Overview 
     This disclosure is directed to oval-shaped metal tanks that create a torus shaped vortex of fermenting wine that are relatively lightweight, easily produced, less labor intensive to clean than compared to egg-shaped concrete tanks and are less costly than egg-shaped concrete tanks. Moreover, these oval-shaped metal tanks are not susceptible to discoloring an appearance or “pinking” (e.g., causing a blush color, a red blush color, etc.) of a white wine that is made in a tank subsequent to producing a red wine in the same tank. 
     In an embodiment, the tanks may include a cone-shaped wall formed of a steel attached to a first dome-shaped surface formed of the steel and a second dome-shaped surface formed of the steel. The cone-shaped wall attached to the first dome-shaped surface and the second dome-shaped surface define an oval-shape that is void of any angled corners on the inside surface of the tank. Because the oval-shape on the inside surface of the tank is void of any angled corners, this provides the necessary smooth arcuate egg-shaped inside surface to displace a product (e.g., wine, red wine, white wine, etc.) in a torus shaped vortex, which produces a continuous and gentle mix of the product void of any dead circulation areas during a fermentation of the product. The cone-shaped wall (e.g., tapered wall) may be narrower at the top of the cone-shaped wall relative to the bottom of the cone-shaped wall, which provides for compressing a cap (e.g., grape solids, skins, seeds, stems, etc.) throughout the fermentation of the product. Because the cone-shaped wall compresses the cap, this provides for a majority of the cap to remain submerged and in constant contact with the product. Mixing the product in the torus shaped vortex eliminates the need for any intervention by a user (e.g., winemaker, worker, etc.) to produce a complete and complex product. For example, a user may simply initiate the fermentation process, and the smooth arcuate egg-shaped inside surface causes the product to be displaced in the torus shaped vortex, but without user intervention to mix the product with lees, mix the product with yeast, etc. Stated otherwise, the torus shaped vortex may be started by a worker initiating the fermentation process in the tank that gently mixes the product such that the product is in constant gentle contact with the lees and the yeast, without intervention by a worker. 
     The tanks may include a cooling jacket attached to the cone-shaped wall. The cooling jacket may be attached to a top half of the cone-shaped wall. The cooling jacket may be thermostatically controlled. The cooling jacket may cool the product when the product encounters an inside top half surface of the cone-shaped wall. As the cooling jacket cools the product, the product is displaced down (e.g., sinks) toward the second domed shape surface (e.g., metal bottom dome, bottom head, etc.). 
     Because the oval-shape on the inside surface of the tank is void of any angled corners, this provides the smooth arcuate egg-shaped inside surface for the cooled product to be displaced down to the second domed shape surface without any dead circulation areas, which provides a homogeneous mixture of the product. Moreover, the exothermic reaction of the fermentation process provides for the product located at the center of the tank to remain warmer than the cooled product located at the inside surface of the tank, which provides for displacing the product back up towards the first domed shape surface (e.g., metal top dome, top head, etc.) at which point the product is again cooled by the cooling jacket to displace the product back down toward the second domed shape surface. During the fermentation of the product, the heating and cooling of the product displaces the product in the tank in the torus shaped vortex, which homogeneously mixes the product continuously and gently without any dead circulation areas to produce a complete and complex product. 
     The tanks may further include an oxygenation system (e.g., a mirco-oxygenation system, micro-ox system, a macro-oxygenation system, etc.). The oxygenation system may provide for oxygenation of the product contained in the tank. For example, the oxygenation system may be inserted in the tank which has an oxygenation stone (e.g., stainless steel O2 stone, stainless diffusion stone, micro diffusion stone, oxygen aeration stone, oxygen stone, etc.) disposed proximate to the second domed shape surface. The oxygenation system may provide for piping controlled quantities of pure oxygen (O2) into the product contained in the tank. 
     The tanks may be formed of stainless steel. For example, one or more of the first domed shape surface, the second domed shape surface, and/or the cone-shaped wall may be formed of stainless steel. The use of stainless steel may reduce the weight of the tank so as to weigh about 80% less than similarly sized or capacity egg-shaped concrete fermentation tank. Therefore, the tank according to the instant disclosure may be more easily transported, set, and removed without specialized moving equipment required by the heavier egg-shaped concrete fermentation tanks. For example, a 1,600 liters (420 gallons) egg-shaped concrete fermentation tank weighs about 2 tons (˜1800 kilograms), whereas a 1,600 liters metal tank weighs about 800 pounds (˜360 kilograms). The elimination of the need for specialized moving equipment may significantly reduce the higher costs associated with concrete fermentation tanks. 
     Moreover, because the tanks may be formed of stainless steel, the tanks may be easily produced in larger sizes than egg-shaped concrete fermentation tanks. For example, because of the mass, weight, and/or casting limitations of concrete, the maximum size an egg-shaped concrete fermentation tank that has been produced using existing techniques is about 3,400 liters (900 gallons). In contrast, a size of an tank may be produced greater than about 38,000 liters (˜10,000 gallons). Because the tanks may be produced in larger sizes than egg-shaped concrete fermentation tanks, the tanks provide for greater economies of scale for a user (e.g., wine maker) as compared to the egg-shaped concrete fermentation tanks. For example, the tanks provide for maximizing a yield of floor space by about 11 times more than the egg-shaped concrete fermentation tanks. Thus, a user may produce more volume of product in the same or smaller area of floor space with the tanks than a volume of product produced in the egg-shaped concrete fermentation tanks. 
     Further, because the tanks may be formed of stainless steel, the tanks may be more easily cleaned as compared to the egg-shaped concrete fermentation tanks. For example, the tanks are easily cleaned using typical cleaning protocols involving scrubbers, metal, hot water, ozone, chlorine, strong acids, and bases, whereas the egg-shaped concrete fermentation tanks are porous, which allows microbes and bacteria to lodge into these pores, and they are susceptible to being damaged by the scrubbers, metal, hot water, ozone, chlorine, strong acids, and bases. 
     Illustrative Oval-Shaped Metal Tank 
       FIG. 1  illustrates a front, top, right-side perspective view  100  of an example tank  102 . The tank  102  may be a fermentation tank such as a red wine fermenter for holding a juice, for example. The tank  102  may be an oval-shaped metal tank. In an embodiment, the tank  102  may include a cone-shaped wall  104  formed of a steel sheet attached between a first dome-shaped surface  106  formed of steel and a second dome-shaped surface  108  formed of steel. In one possible implementation, a size of the cone-shaped wall may have a height of about 66 inches. The first dome-shaped surface  106  may be a metal top dome (e.g., a top head) of the tank  102 . The second dome-shaped surface  108  may be a metal bottom dome (e.g., a bottom head) of the tank  102 . 
     The cone-shaped wall  104  may include a first wall portion  110  formed of the steel and attached to a second wall portion  112  formed of the steel. For example, the first wall portion  110  may be welded (e.g., seam welded) to the second wall portion  112 . The first wall portion  110  attached to the second wall portion  112  may define a seam  114  having an elliptical shape. The elliptical shape of the seam  114  may circumnavigate the cone-shaped wall  104  convolutely (e.g., twisted, coiled, etc.) along a longitudinal length of the cone-shaped wall  104 . Additionally, the first wall portion  110  may be attached to the second wall portion  112  such that the seam  114  is void of angled corners, steps, and/or flats on the inside surface of the tank  102 . 
     The first wall portion  110  has a top perimeter  116  and the second wall portion has a bottom perimeter  118  opposite the top perimeter  116 . The top perimeter  116  of the first wall portion  110  may be attached to a perimeter of the first dome-shaped surface  106 . For example, the top perimeter  116  of the first wall portion  110  may be welded (e.g., seam welded) to the perimeter of the first dome-shaped surface  106 . The top perimeter  116  of the first wall portion  110  may be attached to the perimeter of the first dome-shaped surface  106  such that the attachment is void of angled corners, steps, and/or flats on the inside surface of the tank  102 . The bottom perimeter  118  of the second wall portion  112  may be attached to a perimeter of the second dome-shaped surface  108 . For example, the bottom perimeter  118  of the second wall portion  112  may be welded (e.g., seam welded) to the perimeter of the second dome-shaped surface  108 . The bottom perimeter  118  of the second wall portion  112  may be attached to the perimeter of the second dome-shaped surface  108  such that the attachment is void of angled corners, steps, and/or flats on the inside surface of the tank  102 . In this way, an inside surface of the tank  102  has an oval-shape (e.g., egg shape) void of angled corners on the inside surface of tank  102  such that when a product contained in the tank  102  is displaced, the product is displaced in a torus shaped vortex between the first dome-shaped surface  106  and the second dome-shaped surface  108 . 
     In an embodiment, the tank  102  may include a cooling jacket  120  attached to the cone-shaped wall  104 . For example, the cooling jacket  120  may be attached to a top half of the cone-shaped wall  104 . In another example, the cooling jacket  120  may be attached to the first wall portion  110  of the cone-shaped wall  104 . 
     The tank  102  may further include fitting(s)  122 . One or more of the fittings  122  may be an oxygenation port. The oxygenation port may receive at least a portion of an oxygenation system (e.g., a mirco-oxygenation system, micro-ox system, a macro-oxygenation system, etc.) (not shown). For example, an oxygenation system may be inserted into the tank  102  via the fitting  122  such that an oxygenation stone (e.g., stainless steel O2 stone, stainless diffusion stone, micro diffusion stone, oxygen aeration stone, oxygen stone, etc.) (not shown) may be disposed proximate to the second domed-shaped surface  108 . In one example, the fitting  122  may be disposed in the first dome-shaped surface  106  (not depicted). In another example, the fitting  122  may be disposed in a manway assembly  124  attached to the first dome-shaped surface  106  (depicted in  FIG. 1 ). The tank  102  may include a manway assembly  126  attached to the second dome-shaped surface  108 . 
       FIG. 2  illustrates a back, top, left-side perspective view  200  of the tank  102  shown in  FIG. 1 .  FIG. 2  illustrates the cone-shaped wall  104  of the tank  102  may include a seam  202 . For example, a first vertical edge of the cone-shaped wall  104  may be attached to a second vertical edge of the cone-shaped wall  104 . For example, the first vertical edge of the cone-shaped wall  104  may be welded (e.g., seam welded) to the second vertical edge of the cone-shaped wall  104 . The seam  202  of the cone-shaped wall  104  may extend rectilinearly along a longitudinal length of the cone-shaped wall  104 . 
     The cooling jacket  120  may have the same cone shape as the cone-shaped wall  104  to provide for interfacing with the outside surface of the cone-shaped wall  104 . For example, the top perimeter  116  of the cone-shaped wall  104  may be narrower relative to the bottom perimeter  118  of the cone-shaped wall  104 , and the cooling jacket  120  may have a cone shape (e.g., tapered shape) having a narrower top perimeter relative to a bottom perimeter that are equal to the top perimeter  116  and bottom perimeter  118  of the cone-shaped wall  104  to fit on the cone shape of the exterior surface of the cone-shaped wall  104 . 
     The cooling jacket  120  may include one or more ports  204  (only two are depicted). The one or more ports  204  may provide for a coolant (e.g., glycol coolant) to be pumped through the cooling jacket  120 . One of the one or more ports  204  may be an “in” port and one of the one or more ports  204  may be an “out” port located in the cooling jacket  120  to maximize a flow rate of the coolant through the cooling jacket  120 . The flow rate be about 5 gallons per minute (gpm) at about 50 pounds per square inch (psi). The cooling jacket  120  may be a resistance spot-welded dimpled jacket attached to the outside surface of the cone-shaped wall  104 . The cooling jacket  120  may have a gap of about 0.08 inches between the outside surface of the cone-shaped wall  104  and the inside surface of the cooling jacket  120  facing the outside surface of the cone-shaped wall  104 . For example, the cooling jacket  120  may be pillowed (e.g., inflated) to provide a gap of about 0.08 inches between the outside surface of the cone-shaped wall  104  and the inside surface of the cooling jacket  120  facing the outside surface of the cone-shaped wall  104 . The coolant may be pumped through the cooling jacket  120  (e.g., through the gap between the outside surface of the cone-shaped wall  104  and the inside surface of the cooling jacket  120 ) via a refrigeration system. For example, the coolant may be pumped through the cooling jacket  120  via a central refrigeration system of a winery. The temperature of the cooling jacket  120  may be controlled via a tank monitoring system. The temperature of the cooling jacket  120  may be determined by a winemaker, which may be dependent upon a type of grape, a type of yeast, and/or a type of wine being produced. 
     In one implementation, a size of the tank  102  may have a minimum outside diameter of about 48 inches and a maximum diameter of about 64 inches. For example, in an implementation, the top perimeter  116  of tank  102  may have a minimum outside diameter of about 48 inches and the bottom perimeter  118  of the tank  102  may have a maximum diameter of about 64 inches. A tank having components with the dimensions described herein may have a volume of about 950 gallons. While the specification describes a tank having a minimum outside diameter of about 48 inches, a maximum diameter of about 64 inches, and a volume of about 950 gallons, it is contemplated that the tank may be of any size and or shape. 
     In an alternative implementation, a size of the tank  102  may have a minimum diameter smaller than 48 inches, a maximum diameter smaller than 64 inches, and a volume less than 950 gallons. In this example, where the tank  102  has a minimum diameter smaller than 48 inches, a maximum diameter smaller than 64 inches, and a volume less than 950 gallons, the cone-shaped wall  104  may not include both of the first wall portion  110  and the second wall portion  112 . That is, in view of capabilities and/or limitations of standard manufactured sizes of stainless steel sheets, the cone-shaped wall  104  may with only a first wall portion  110  to form a tank having the volume less than 950 gallons. 
     In contrast, as indicated above, in an example where the minimum diameter is larger than 48 inches, the maximum diameter larger is than 64 inches, and the volume desired is greater than 950 gallons, the cone-shaped wall  104  may include one or more additional wall portions attached to the first wall portion  110  and/or the second wall portion  112 . For example, because the tank  102  has a minimum diameter larger than 48 inches, a maximum diameter larger than 64 inches, and a volume greater than 950 gallons, the cone-shaped wall  104  may require one or more additional wall portions welded (e.g., seam welded) to the first wall portion  110  and/or the second wall portion  112  to form a tank having the volume greater than 950 gallons. The minimum diameter and the maximum diameter of the tank may depend on a desired volume of the tank  102 , and the quantity of wall portions may depend on a desired volume of the tank. 
     The tank  102  having the volume of about 950 gallons may have a height of about 94 inches from the top outside surface of the first dome-shaped surface  106  to a bottom outside surface of the second dome-shaped surface  108 . Notably, the tank  102  may have any height. The tank  102  may include support legs  206 . For example, the tank  102  may include legs and/or bracing welded to the tank  102 . A height of the tank  102  may be adjusted via the legs  206 . In an implementation, a size of the tank  102  having the volume of about 950 gallons may have an overall height of about 142 inches. 
       FIG. 3  illustrates a transparent view  300  of the tank  102  shown in  FIG. 1  to depict a product  302  being displaced in a torus shaped vortex  304  within the tank  102 .  FIG. 3  illustrates the first dome-shaped portion  106 , the cone-shaped wall  104 , and the cooling jacket  120  as being transparent to show displacement of the product  302 . As the cooling jacket  120  attached to the cone-shaped wall  104  cools the product  302  encountering an inside top half surface  306  of the cone-shaped wall  104 , the product  302  is displaced in a direction  308  down toward the second dome-shaped surface  108 . As the exothermic reaction of the fermentation process of the product  302  releases heat, the product  302  located at a center  310  of the tank  102  is displaced in a direction  312  back up towards the first domed-shape surface  106 . Thus, the exothermic reaction heating the product  302  and the cooling jacket  120  cooling the product  302  displaces the product  302  in the tank  102  in the torus shaped vortex  304 , and homogeneously mixes the product  302  continuously and gently without any dead circulation areas to produce a complete and complex product  302 . Because the first dome-shaped portion  106  of the cone-shaped wall  104  is narrower than the second dome-shaped portion  108  of the cone-shaped wall  104 , a cap  314  of grape solids, skins, seeds, stems, etc. may be compressed and remain submerged in the product  302 , such that the cap  314  is in constant contact with the product  302  throughout the fermentation of the product  302 . 
       FIG. 4  illustrates a planar view  400  of an example first wall portion  402  of the tank  102  shown in  FIG. 1 . The first wall portion  402  may be the same as the first wall portion  110  shown in  FIGS. 1 and 2 . The first wall portion  402  may be cut from a coil stock. For example, the first wall portion  402  may be cut from a coil stock of 12 gauge (GA), steel (e.g., A240-T304 stainless steel (SS), #4 finish)). The coil stock may have a width of about 60 inches. For example, the standard coil stock width (e.g., largest width) available for purchase (e.g., off-the-shelf) may be 60 inches. The first wall portion  402  may have a bottom length  404  of about 194 inches. The first wall portion  402  may have a top length  406  of about 147 inches (i.e., straight line distance between point A and point B). The first wall portion  402  may have a width  408  of about 59 inches. The first wall portion  402  may have a grain direction  410  that is parallel to the bottom length  404  and/or the top length  406 . The grain direction  410  of the first wall portion  402  may be the same as a grain direction of the 12 GA coil stock, where the grain direction of the 12 GA coil stock is in a direction of a roll of the 12 GA coil stock perpendicular to the width of the 12 GA coil stock. 
       FIG. 5  illustrates a planar view  500  of an example second wall portion  502  of the tank  102  shown in  FIG. 1 . The second wall portion  502  may be the same as the second wall portion  112  shown in  FIGS. 1 and 2 . The second wall portion  502  may be cut from a coil stock. For example, the second wall portion  502  may be cut from a coil stock of 12 gauge (GA), steel (e.g., A240-T304 stainless steel (SS), #4 finish). The second wall portion  502  may have a bottom length  504  of about 196 inches (i.e., straight line distance between point C and point D). The second wall portion  502  may have a top length  506  of about 194 inches. The second wall portion  502  may have a width  508  of about 22 inches. The second wall portion  502  may have a grain direction  510  that is parallel to the bottom length  504  and/or the top length  506 . The grain direction  510  of the second wall portion  502  may be the same as the grain direction  410  of the first wall portion  402 . 
       FIG. 6  illustrates a planar view  600  of an example cooling jacket  602  of the tank  102  shown in  FIG. 1 . The cooling jacket  602  may be the same as the cooling jacket  120  shown in  FIGS. 1 and 2 . The cooling jacket  602  may be cut from a coil stock. For example, the cooling jacket  602  may be cut from a coil stock of 20 gauge (GA), steel (e.g., A240-T304 stainless steel (SS), #4 finish). The cooling jacket  602  may have a bottom length  604  of about 170 inches. The cooling jacket  602  may have a width  606  of about 46 inches. The cooling jacket  602  may have a grain direction  608  that is parallel to the bottom length  604 . The grain direction  608  of the cooling jacket  602  may be the same as a grain direction of the 20 GA coil stock, where the grain direction of the 20 GA coil stock is in a direction of a roll of the 20 GA coil stock perpendicular to the width of the 20 GA coil stock. The cooling jacket  602  may have a width  610  of about 33 inches. The cooling jacket  602  may have a radius of about 469 inches. 
       FIG. 7  illustrates a top view  700  of an example cone-shaped wall assembly  702  including the first wall portion  402 , the second wall portion  502 , and the cooling jacket  602  shown in  FIGS. 4, 5, and 6 . The cone-shaped wall assembly  702  may be the same as the cone-shaped wall  104  shown in  FIGS. 1, 2, and 3 . The bottom length  404  of the first wall portion  402  may be attached to the top length  506  of the second wall portion  502 . For example, the bottom length  404  of the first wall portion  402  may be seam welded to the top length  506  of the second wall portion  502 . The cooling jacket  602  may be attached to a top surface  704  of the first wall portion  402 . For example, the cooling jacket  602  may be resistance spot welded to the top surface  704  of the first wall portion  402 . 
       FIG. 8  illustrates a side view  800  of an example first dome-shaped surface  802  shown in  FIG. 1 . The first dome-shaped surface  802  may be the same as the first dome-shaped surface  106  shown in  FIGS. 1, 2, and 3 . In an implementation, a possible size of the first dome-shaped surface  802  may have an outside diameter  804  of about 48 inches. The first dome-shaped surface  802  may have a height  806  of about 12 inches. The first dome-shaped surface  802  may have knuckle radius  808  of about 8 inches. The first dome-shaped surface  802  may have crown radius  810  of about 42 inches. The first dome-shaped surface  802  may be formed of a steel (e.g., A240-T304 stainless steel (SS)). 
       FIG. 9  illustrates a side view  900  of an example second dome-shaped surface shown in  FIG. 1 . The second dome-shaped surface  902  may be the same as the second dome-shaped surface  108  shown in  FIGS. 1, 2, and 3 . The second dome-shaped surface  902  may have an outside diameter  904  of about 64 inches. The second dome-shaped surface  902  may have a height  906  of about 17 inches. The second dome-shaped surface  902  may have knuckle radius  908  of about 12 inches. The second dome-shaped surface  902  may have crown radius  910  of about 56 inches. The second dome-shaped surface  902  may be formed of a steel (e.g., A240-T304 stainless steel (SS)). 
     Example Method of Making an Oval-Shaped Metal Tank 
       FIGS. 10A-B  collectively illustrate an example method  1000  of making an example oval-shaped metal (e.g., tank  102 ) that, when completed, has an oval shape on an inside surface of the tank that is void of any angled corners. The oval-shaped inside surface provides the smooth arcuate egg-shaped inside surface to displace a product (e.g., product  302 ) in a torus shaped vortex (e.g., torus shaped vortex  304 ) that continuously and gently mixes the product void of any dead circulation areas during a fermentation of the product. 
     Method  1000  may include an operation  1002 , which represents measuring a circumference of a first dome-shaped surface (e.g., first dome-shaped surface  106  or  802 ) formed of steel and measuring a circumference of a second dome-shaped surface (e.g., second dome-shaped surface  108  or  902 ) formed of steel. For example, operation  1002  may include measuring a circumference of a first dome-shaped surface and a circumference of a second dome-shaped surface that may have been provided by a manufacture (e.g., third party manufacture) of heads for tanks. 
     Method  1000  may proceed to operation  1004 , which represents cutting coil stock to produce a first wall portion (e.g., first wall portion  110  or  402 ) and a second wall portion (e.g., second wall portion  112  or  502 ) of the tank. For example, the first wall portion and/or the second wall portion may be laser cut, water jet cut, etc. from a 12-gauge (GA) coil stock of steel (e.g., A240-T304 stainless steel (SS), #4 finish). The first wall portion may be cut from the coil stock based at least in part on the measurement of the circumference of the first dome-shaped surface. For example, a top length (e.g., top length  406 ) of the first wall portion may be cut from the coil stock to match the circumference of the first dome-shaped surface. The second wall portion may be cut from the coil stock based at least in part on the measurement of the circumference of the second dome-shaped surface. For example, a bottom length (e.g., bottom length  504 ) of the second wall portion may be cut from the coil stock to match the circumference of the second dome-shaped surface. Operation  1004  may include cutting a bottom length (e.g., bottom length  404 ) of the first wall portion and cutting a top length (e.g., top length  506 ) of the second wall portion from the coil stock such that the bottom length of the first wall portion matches the top length of the second wall portion. 
     Method  1000  may include operation  1006 , which represents attaching the first wall portion to the second wall portion. For example, the bottom length of the first wall portion may be attached to the top length of the second wall portion. For example, the bottom length of the first wall portion may be seam welded to the top length of the second wall portion. 
     Method  1000  may include operation  1008 , which represents cutting coil stock to produce a cooling jacket (e.g., cooling jacket  120 , cooling jacket  602 ). For example, the cooling jacket may be laser cut, water jet cut, etc. from a 12-gauge (GA) coil stock of steel (e.g., A240-T304 stainless steel (SS), #4 finish). The cooling jacket may be cut from the coil stock based at least in part on a cone shape (e.g., tapered shape) of the cone-shaped wall (e.g., cone-shaped wall  104 ). For example, the cooling jacket may be cut from the coil stock to have a narrower top perimeter relative to a bottom perimeter that are equal to a top perimeter (e.g., top perimeter  116 ) and bottom perimeter (e.g., bottom perimeter  118 ) of the cone-shaped wall to fit on the cone shape of the exterior surface of the cone-shaped wall. 
     Method  1000  may include operation  1010 , which represents attaching the cooling jacket to the first wall portion. For example, the cooling jacket may be resistance spot welded to the first wall portion. The first wall portion attached to the second wall portion, and the cooling jacket attached to the first wall portion defining a cone-shaped wall assembly (e.g., cone-shaped wall assembly  702 ). 
     Method  1000  may be include operation  1012 , which represents rolling the cone-shaped wall assembly into a cone shape. For example, the cone-shaped wall assembly may have a substantially planar cross-sectional profile subsequent to the assembly of the cone-shaped assembly, and the planar cone-shaped assembly may be rolled via a needle roller bearing to impart a desired cone shape to the cone-shaped assembly. 
       FIG. 2B  continues the illustration of the method  1000 , which may include operation  1014 , which represent attaching a first vertical edge of the cone-shaped wall to a second vertical edge of the cone-shaped wall. For example, the first vertical edge of the cone-shaped wall may be welded (e.g., tack welded) to the second vertical edge of the cone-shaped wall. The first vertical edge attached to the second vertical edge defining a seam (e.g., seam  202 ) of the cone-shaped wall. 
     Method  1000  may include operation  1016 , which represents attaching the first dome-shaped surface and the second dome-shaped surface to the cone-shaped wall. For example, a perimeter (e.g., circumference) of the first dome-shaped surface may be fitted and tack welded to a top perimeter (e.g., top perimeter  116 ) of the first wall portion of the cone-shaped wall, and a perimeter (e.g., circumference) of the second dome-shaped surface may be fitted and tack welded to a bottom perimeter (e.g., bottom perimeter  118 ) of the second wall portion of the cone-shaped wall. 
     Method  1000  may include operation  1018 , which represents finish welding the attachments, interfaces, seams, etc. between the first dome-shaped surface, the cone-shaped wall, and the second dome-shaped surface. For example, the first vertical edge of the cone shaped wall may be finished welded to the second vertical edge of the cone-shaped wall, the perimeter of the first dome-shaped surface may be finished welded to the top perimeter of the first wall portion, and the perimeter of the second dome-shape surface may be finished welded to the bottom perimeter of the second wall portion. Operation  1018  may also represent finish welding the cooling jacket to the first wall portion. 
     Method  1000  may include operation  1020 , which represents pillowing the cooling jacket. For example, the cooling jacket that is finish welded to the first wall portion may be inflated to provide about a 0.08-inch gap between the outside surface of the first wall portion and the inside surface of the cooling jacket  120  facing the outside of the first wall portion. 
     Method  1000  may include operation  1022 , which represents attach fittings (e.g., fitting(s)  122 ), manways (e.g., manway assemblies  124  and  126 ), legs and/or bracing to the tank. For example, fittings, manways, legs, and/or bracing may be welded to the tank. 
     Method  1000  may be complete at operation  1024 , which represents testing the tank. For example, the tank may be leak tested, pressure tested, corrosion tested, etc. 
     CONCLUSION 
     Although the invention has been described in language specific to structural features and/or methodological acts, it is to be understood that the invention is not necessarily limited to the specific features or acts described. Rather, the specific features and acts are disclosed as illustrative forms of implementing the invention. For example, while embodiments are described having certain shapes, sizes, and configurations, these shapes, sizes, and configurations are merely illustrative.