an exemplary embodiment of the turbulated submersible heat - exchange apparatus of the present invention is shown in the accompanying fig1 - 4 , and is generally referred to by the numeral 10 . the apparatus 10 comprises an elongate cylindrical heat - exchanging component 40 interconnected at one end with a coupling manifold 20 while the other end of component 40 is sealably engaged with a plug 50 . a spiralled turbulator insert 30 extends through the heat - exchanging component 40 and abuts the manifold 20 and plug 50 . the coupling manifold 20 is provided with a collar 28 having an outward - facing male - threaded coupling portion 21 configured for threadably and sealably engaging a tank housing ( not shown ) and an inner - facing female - threaded coupling portion 26 for sealably interconnecting with the heat - exchanging component 40 . a bore 25 extends through the collar 28 into the body of the coupling manifold 20 and communicates with a threaded inlet / outet port 23 and a threaded inlet / outlet port 24 . the inlet / outlet ports 23 and 24 are preferably configured to sealably engage conventional hose barbs and / or fluid transmission lines commonly known to those skilled in these arts . it is to be noted that , if so desired , ports 23 and 24 may be configured identically so that either port may serve as an inlet port and the opposing port may serve as the outlet port . a transverse slot 27 is provided at the end of the bore 25 . the portion of the manifold 20 opposite the collar 28 is notched to provide two opposing flat surfaces 22 configured to cooperate with the jaws of a wrenching tool ( not shown ). the heat - exchanging component 40 comprises a cylindrical conduit 41 provided with a plurality of uniformly spaced - apart heat - exchanging devices as exemplified in fig1 - 3 by fins 42 that radiate outwardly from the exterior surface of conduit 41 , said plurality of fins 42 extending to a first end of the conduit 41 . it is within the scope of this invention to provide a cylindrical conduit provided with a plurality of uniformly spaced - apart heat - exchanging devices , wherein one of the ends is preformed into a leakproof sealed end ( not shown ). the plug 50 is configured to slidingly and sealingly engage the inner core of the first end of the conduit 40 . a ferrule 55 is interposed the conduit 40 and the plug 50 . if so desired , the plug 50 and the first end of conduit 40 may be configured to threadably cooperate . alternatively , one end of the conduit 40 may be preformed into a leaf - proof sealed end prior to assembly of the apparatus of the present invention . the opposite end of the conduit 40 is provided with an integral locking nut 43 having a male - threaded collar portion 44 configured for threadably and sealably engaging the female - threaded coupling portion 26 of the manifold 20 . a ferrule 55 is interposed the locking nut 43 and the conduit 40 . an exemplary helical turbulator insert 30 is configured to slidingly communicate with the inner core of the cylindrical conduit 41 . a first end 31 of the turbulator insert 30 is configured into an elongate tang for slidingly engaging slot 27 provided at the end of bore 25 in the coupling manifold 20 . the second end 32 of the turbulator insert 30 is elongate and abuts the plug 50 . the second end 32 of the turbulator insert 30 is provided with a u - shaped opening . the turbulated submersible heat - exchange apparatus 10 of the present invention is assembled by inserting the tang end 31 of the turbulator insert through bore 25 of the coupling manifold 20 into the slot 27 . the heat - exchanging component is prepared for assembly by inserting plug 50 through ferrule 55 into the core of the first end of the cylindrical conduit 41 after which it is sealingly engaged to the conduit 41 . examples of suitable methods for sealingly engaging the plug 50 and ferrule 55 with the cylindrical conduit 41 include compression fittings , gluing with epoxy - type compounds , soldering , brazing and welding . alternatively , the first end of the conduit 41 and the male end of the plug 50 may be threaded for threadable engagement . the opposite end of the heat - exchanging component 40 is then slid over the second end 32 of the turbulator insert 30 extending from the coupling manifold 20 , after which the male - threaded coupling 44 of the heat - exchanging component 40 is engaged with the female - threaded coupling 26 of the coupling manifold 20 , and then tightened by concurrently twisting together locking nut 43 and opposing flat surfaces 22 until a leak - proof seal is achieved . the assembled apparatus 10 may then be installed into a tank provided with a female - threaded receptacle for threadably and sealably engaging with coupling portion 21 of the coupling manifold 20 . if so desired , selected hose barbs ( not shown ) may be sealably engaged with the inlet port 23 and the outlet port 24 of the coupling manifold prior to installation of the apparatus 10 into a tank wherein fluids with thermo - variable viscosities are to be stored . alternatively , metal fluid transmission lines provided with compression nuts ( not shown ) may be sealably engaged with the inlet and outlet ports 23 and 24 of the coupling manifold 20 after the apparatus 10 has been sealably engaged with a tank selected for storage of industrial oil products such as fuel oils , hydraulic oils , crude and refined petroleum oil products , plant - derived oils , animal - derived oils , and other types of industrial fluids such as glycols , water - based hydraulic fluids , and oil - field brines . after installation , the inlet and outlet ports 23 and 24 of the apparatus 10 are preferably interconnected to a pressurizable supply of a temperature - controlled heat - exchange fluid , said supply comprising at least a fluid reservoir , a temperature - modifying and temperature - regulating component , a controllable device for pressurizing said temperature - controlled heat - exchange fluid , and fluid transmission lines interconnecting said supply and the apparatus 10 of the present invention . it is preferable that the pressurizable supply of a temperature - controlled heat - exchange fluid is also provided with at least one fluid transmission line that isolates the supply from the apparatus 10 whereby the heat - exchange fluid is cyclable only within the pressurizable supply . the turbulated submersible heat - exchange apparatus 10 of the present invention is particularly useful for very quickly heating and thereby decreasing the viscosity of a cold - thickened oil product stored within a tank under cold weather conditions . in such situations , the heat - exchange fluid is isolated from the apparatus 10 and cycled within the pressurized supply system while it is heated to and maintained about a selected operating temperature , e . g ., in the range of 85 ° c . to 99 ° c . it should be noted that the turbulated submersible heat - exchange apparatus is suitable for cooperating with steam as the heat - exchange medium circulating theretbrough . the heated heat - exchange fluid is then controllably released under pressure into the transmission line ( not shown ) interconnecting the supply to the inlet port 23 of the coupling manifold 20 and enters bore 25 where its flow is redirected by the tang - shaped end 31 along the inlet - facing surface of the turbulator insert 30 toward the opposite end where it flows sideways through the u - shaped opening 32 and is redirected along the outlet - facing surface of the turbulator insert 30 to the tang - shaped end 31 where it is redirected to flow out of apparatus 10 through outlet port 24 . it is to be noted that the engagement of the tang 31 of the turbulator with the slot 27 in the coupling manifold 20 prevents the turbulator 30 from spinning within the heat - exchanging component 40 thereby maintaining the bidirectional spiralling flow patterns of the pressurized heat - exchange fluid provided by the helical turbulator insert 30 within and along the length of the heat - exchange component 40 thereby facilitating the rapid and even transfer and dissipation of heat from the pressurized heat - exchange fluid within the heat - exchange component through the walls of the cylindrical conduit 41 and heat - exchange fins 42 into the surrounding thickened oils , while minimizing the occurrence of hot and cold spots . fig5 and 6 a show an alternative embodiment for providing a separated two - way flow of a pressurized heat - exchange fluid within and along the core of the heat - exchanging conduit 41 , wherein a flat rectilinear flow separator 100 is provided with a tang end 101 configured to engage the transverse slot 27 provided at the end of the bore 25 in the body of the coupling manifold 20 while the opposite end 102 is provided with a u - shaped opening and configured to engage the end of the plug 50 . in operation , heated heat - exchange fluid enters the turbulated immersion heat exchange apparatus through the inlet port 23 of the coupling manifold 20 and enters bore 25 where its flow is redirected by the tang - shaped end 31 along the inlet - facing surface of the flow separator insert 100 toward the opposite end where it flows sideways through a pair of bores 102 and is redirected along the outlet - facing surface of the flow separator insert 100 to the tang - shaped end 101 where it is redirected to flow out of apparatus 10 through outlet port 24 . if so desired , a single bore or multiple bores may be provided for the sideway &# 39 ; s flow of heat - exchange fluid through the flow separator inert 100 . alternatively , the bores 102 may be replaced with a u - shaped opening similar to the one shown in fig2 and 3 . fig6 b shows another exemplary elongate flow separator 120 provided with opposing rolled elongate edges 120 a configured to direct the flow of the heat - exchange fluid within the cylindrical conduit 41 away from the junctures of the flow separator 120 and the conduit 40 walls . fig7 shows another exemplary embodiment for sealingly engaging the heat - exchange component 40 with the coupler manifold 20 , wherein the collar portion 28 of the coupler manifold 20 is provided with an inner bore 120 configured for sealably receiving and engaging there in a tapered neck portion 155 of a collar 150 integrally conjoined to the heat - exchange cylindrical conduit 41 of the heat - exchange component 40 . the coupler 20 may be sealingly engaged with the collar 150 by application of pressure , or alternatively , by a polymeric adhesive or brasing or other like methods . fig8 a and 8 b show another exemplary embodiment of the coupling manifold 20 provided with two opposing flat surfaces 22 configured to cooperate with the jaws of a wrenching tool ( not shown ) wherein : ( a ) an additional threaded inlet / outlet port 123 is provided at about a 90 ° angle to inlet / outlet port 23 , and ( b ) an additional threaded inlet / outlet port 124 is provided at about a 90 ° angle to inlet / outlet port 24 . this configuration provides options for sealingly engaging conventional hose barbs and / or fluid transmission lines with the sides of the coupling manifold 20 or alternatively with the end . those skilled in these arts will understand the individual components comprising the turbulated submersible heat - exchange apparatus 10 of the present invention may be configured and tailored specifically for installation and use in different sizes and shapes of fuel tanks , hydraulic oil tanks and reservoir storage tanks , e . g ., by changing : ( a ) the diameters and dimensions of the inlet and outlet ports 23 and 24 , the bore 25 , and the male - threaded and female - threaded coupling portions 21 and 26 of the coupling manifold , ( b ) the length , diameter and wall - thickness of the cylindrical conduit 41 , ( d ) the thickness , spacing and outer diameter of the heat - exchanging fins 42 , and ( d ) the thickness and number of spirals provided along a given length of the helical turbulator insert 30 . for installations into fuel tanks , it is preferable that the turbulated submersible heat - exchange apparatus 10 is mounted in a horizontal axis in parallel with and near the bottom of the fuel tank . alternatively , the heat - exchange apparatus may be mounted through the bottom of the tank with the finned heat - exchanging component 40 extending upwardly in a vertical orientation . for installations in closed - system hydraulic oil tanks communicating with hydraulic cylinders configured to manipulate tasking attachments , the turbulated submersible heat - exchange apparatus 10 may be installed through the top of the tank with the finned heat - exchanging component 40 extending downwardly in a vertical orientation . regardless of mounting orientation , the installed submersible heat - exchange apparatus may be interconnected with a heat - exchange fluid transmission line communicating with the cooling system provided for the equipment &# 39 ; s engine . alternatively , the inlet port for receiving a heated heat - exchange fluid into the submersible heat - exchange apparatus may be configured for quick - release demountable engagement with transmission line communicating with a pressurized supply of heat - exchange fluid . such a supply may be installed in and provided from a service building and may be configured to quick connect and disconnect with a plurality of mobile equipment provided with the submersible heat - exchange apparatus of the present invention . alternatively , the supply may be mounted on and operable from a transportable equipment which may be driven to equipment provided with the submersible heat - exchange apparatus of the present invention . the present invention is also suitable for installations in large reservoir tanks configured for storage of crude and refined petroleum products in refineries and depots , wherein the facilities &# 39 ; heating / cooling utilities can be configured to provide an in - house on - demand supply of pressurized temperature - controlled heat - exchange fluid for transmission to on - site storage tanks equipped with the turbulated submersible heat - change apparatus . another exemplary embodiment of the presenting invention provides for mounting within a single tank , a plurality of interconnected turbulated submersible heat - exchange apparatus of the present invention wherein the outlet port 23 of a first apparatus 10 is interconnected with the inlet port 23 of a second apparatus 10 . it is also within the scope of the present invention to provide a multi - head coupling manifold ( not shown ) configured sealably engage and supply pressurized temperature - controlled heat - exchange fluid to a plurality of heat - exchanging components 40 wherein each component 40 communicates and cooperates with a dedicated bore 25 , and is provided with a turbulator insert 30 having the tang end 31 engaged with a tang slot 27 provided at the end of the dedicated bore 25 . while this invention has been described with respect to the preferred embodiments , it is to be understood that various alterations and modifications can be made to components and the applications of the turbulated submersible heat - exchange apparatus within the scope of this invention , which are limited only by the scope of the appended claims .