Abstract:
The present invention is a low point pipe fitting for draining accumulated condensation from electrical conduit systems that are installed in industrial, commercial and residential facilities. The fitting includes a centrally disposed engaging tool members with opposing threaded fittings with a drain incorporated in the underside of the engaging tool members.

Description:
FIELD OF THE INVENTION 
       [0001]    The present invention relates generally to electrical raceways, and more particularly a device to support electrical drain systems for removing condensation from electrical raceway systems at low point areas. 
         [0002]    In commercial, offshore and industrial construction, it is common practice to contain electrical wiring in metal, or sometimes plastic, conduits. Even in relatively dry locations, moisture typically forms on the interior walls of the conduit due to condensation of various type of vapor in the air. In installations where metal conduits and electrical raceways are employed, corrosion and premature deterioration of the conduit material may result. Further, an accumulation of moisture vapor in the conduit system may result in creating an electrical short circuit and damage to electrical devices. 
         [0003]    Since moisture vapor accumulating inside the conduits can spark flammable vapors within the electrical conduit system, the problem may be eliminated by simply providing an open fitting or even a hole at various low points in the conduit system. Currently the fitting used are expensive, difficult and labor intensive to install. Additionally, the current fittings used add extra weight to structures offshore and require more space to install. The current installation of fittings known to those skilled in the art would require multiple cutting and threading of multiple conduit sections with an increased risk of improper installation. What is needed is a simple device that can be easily installed within an electrical conduit system that decreases the risk of compromising the integrity of the electrical conduit raceway. 
       SUMMARY OF THE INVENTION 
       [0004]    The present invention provides a low point drain fitting for removing accumulated condensation from electrical conduit systems. The drain fitting includes a tubular coupling having a throughbore with internally or externally disposed connection portions on opposing ends. Centrally incorporated upon the external surface of the tubular coupling are tool engaging members protruding outwardly wherein the drain coupling can be easily installed. An aperture is centrally located within the underside of the tool engaging member extending through into the throughbore. In alternative embodiments a screen deterrent can be installed below the aperture. 
         [0005]    One object of the invention is to provide a fitting that is easily installed within the electrical conduit system. Other objects and advantages of the invention will appear from the following description. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0006]    For a detailed description of a preferred embodiment of the invention, reference will now be made to the accompanying drawings wherein: 
           [0007]      FIG. 1  is a perspective view of the fitting installed within an electrical conduit. 
           [0008]      FIG. 1   a  is a perspective view of the alternative embodiment of the electrical conduit. 
           [0009]      FIG. 2  is a cross-section view of the fitting with threads within the drain perpendicular to throughbore. 
           [0010]      FIG. 2   a  is a cross-section view of the fitting with the drain plug 
           [0011]      FIG. 3  is a cross-section view of the fitting with no threads within the drain. 
           [0012]      FIG. 4  is a side view of the fitting with external threads on the tubular member and smooth drain. 
           [0013]      FIG. 4   a  is a side view of the fitting with internal threads on the tubular member and smooth drain. 
           [0014]      FIG. 5  is a side view of the fitting with threads within the drain and tubular member having external threads. 
           [0015]      FIG. 5   a  is a side view of the fitting with threads within the drain and tubular member having internal threads. 
           [0016]      FIG. 6  is a perspective view of the prior art installed within an electrical conduit. 
           [0017]      FIG. 7  is a cross-sectional view of the fitting with external threads on the tubular member and with the screen filter. 
           [0018]      FIG. 7   a  is a side view of the fitting with internal threads and the screen filter. 
           [0019]      FIG. 8  is a cross-sectional view of the device with screen filter. 
           [0020]      FIG. 8   a  is an alternative embodiment of the cross-sectional view of the screen filter connected below a drain plug. 
       
    
    
     DETAILED DESCRIPTION 
       [0021]    With reference to  FIG. 1  there is shown a perspective view of the present invention, drain nipple ( 10 ) with internal connections installed in an electrical conduit system at the low point of gravity to allow drainage as a result of moisture condensation within the electrical conduit system. Drain nipple ( 10 ) is situated between pipe section ( 50 ) and pipe section ( 51 ) wherein the two sections are interconnected within the electrical conduit system ( 55 ) as shown in  FIG. 1 . Alternatively drain nipple ( 12 ) with external connections can be installed between conventional junction T-fittings ( 83 ) wherein pipe sections ( 50 ) and ( 51 ) are interconnected within an electrical conduit system ( 55 ) as shown in  FIG. 1   a.    
         [0022]    In use, to install drain nipple ( 10 ,  12 ) as shown in  FIGS. 1 and 1   a  respectively, at the interconnections of pipe sections ( 50 ) and ( 51 ) a technician would not have to cut and thread which is done currently to install in the prior art as shown in  FIG. 6 . Thus, time is saved during the installation phase. By installing the device ( 10 ,  12 ) of the present invention, additional factory coatings are preserved on metal conduits thereby preventing premature corrosion and eliminating field dressing within an electrical conduit system. 
         [0023]    The drain nipple ( 10 ,  12 ) in  FIG. 1 and 1   a  respectively replaces the juncture configuration  83  depicted in the prior art connecting sections  50  and  51  shown in  FIG. 6 . The device ( 10 ,  12 ) of the present invention decreases the installation time required to install the standard Conduit Tee fitting ( 83 ) illustrated in  FIG. 6  which includes a tee-cover, gasket, reducer and drain plug ( 13 ). Additionally, the time normally required to pull wire through the tee fitting ( 83 ) is significantly decreased by installation of drain nipple ( 10 , 12 ) wherein time and money is saved in equipment and labor. Another advantage is that the drain nipple ( 10 ,  12 ) is a unitary piece that is lighter in weight and requires less space for offshore platform. 
         [0024]    With reference to  FIGS. 2 ,  2   a , and  3  there is shown a cross sectional view of alternative embodiments of the present invention. Drain nipple ( 10 ,  12 ) further comprises a cylindrical tubular member ( 22 ) of a pre-determined length with a throughbore ( 37 ) having a continuous diameter therethrough. Drain Nipple ( 10  or  12 ) can be made of galvanized steel, PVC piping, PVC coated steel, stainless steel, brass, or another suitable type of material that will not rust from moisture or corrosive environments. Referring to  FIGS. 4 ,  4   a ,  5 , and  5   a , in the preferred embodiment, the tubular member ( 22 ) can have a length and diameter configured to accommodate any conduit pipe size. The length of the tubular member ( 22 ) is proportional to and controlled by the diameter of the electrical conduit pipe. In the preferred embodiment the diameter of the tubular member ( 22 ) can be approximately at least ½ inch. Additionally, the length of the opposing coupling sections ( 60 ,  62 ) are proportional to and controlled by the diameter of the electrical conduit pipe and the length of tubular member ( 22 ). Thus, drain nipple ( 10 ,  12 ) of the present invention can be configured and manufactured to fit any electrical conduit pipe. 
         [0025]    Referring to  FIGS. 2 ,  2   a  and  3 , the drain nipple ( 10 ,  12 ) further comprises a unitary tool engaging member ( 20 ) which is generally centrally disposed encircling tubular member ( 22 ) and protruding outward therefrom. Tool engaging member ( 20 ) further comprises a solid three-dimensional structure configured to cooperatively engage with a corresponding tool device. In the preferred embodiment, as shown tool engaging member ( 20 ) is hexagonal and configured to cooperatively engage with a wrench device. However, tool engaging member ( 20 ) can be configured to support other torque tools that can be used to interconnect electrical piping conduits. 
         [0026]    In the preferred embodiment, the hexagonal tool engaging member can be at least ⅞ inches in depth and at least 1⅛ inches wide in length. However, the depth can be configured in length to support aperture ( 25 ,  35 ) as shown in  FIGS. 2 ,  2   a , and  3 . 
         [0027]    Extending from opposing sides of tool engaging member ( 20 ) to a distal end is first tubular portion ( 40 ) and opposing tubular portion ( 45 ) of  FIGS. 4 and 4   a . Drain nipple ( 10 ,  12 ) further comprises a first coupling section ( 60 ) formed upon first tubular portion ( 40 ) and an opposing second coupling section ( 62 ) formed upon opposing tubular portion ( 45 ). Each tubular portion is configured to cooperatively engage with piping conduits within an electrical conduit system as depicted in  FIGS. 1 and 1   a . First coupling section ( 60 ) and opposing second coupling section ( 62 ) have a pre-determined length located on opposing distal ends and can be internally or externally disposed. In the preferred embodiment female or male NPT as well as female or male metric threads having helical structure. In the preferred embodiment first coupling section ( 60 ) and opposing second coupling section ( 62 ) can have a threaded length configured to accommodate the electrical conduit of the system. 
         [0028]    Referring to  FIGS. 2 ,  2   a , and  3  drain nipple ( 10 ,  12 ) further comprises an aperture ( 25 ,  35 ) disposed within one section of the tool engaging member ( 20 ) perpendicularly aligned with throughbore ( 37 ) and having a continuous diameter linearly extending there from. 
         [0029]    In one embodiment as shown in  FIG. 3 , aperture  35  can be smooth as it extends downward. In this embodiment aperture is smooth and can be at least 1/16 th  of an inch. In the alternative embodiment in  FIGS. 2 and 2   a  aperture  25  has connecting members ( 48 ) which extends linearly downward. In this embodiment aperture is slightly larger and can be at least ½ of an inch to allow for connection to a drain screw ( 49 ) within aperture ( 25 ) which allows for drainage of condensation from the electrical conduit raceway. As depicted aperture ( 25 ) is perpendicularly aligned with throughbore ( 37 ) and extends linearly downward therefrom. 
         [0030]    In the preferred embodiment, the connection members ( 60 ,  62 ) are conventional NPT or metric threading as depicted in  FIGS. 4 ,  4   a ,  5 , and  5   a . However, connection members ( 60 ,  62 ) can be configured to support any electrical conduits. Aperture ( 25 ,  35 ) can be have a small diameter of 1/16 th  inch or a larger diameter of ½ inch as respectively depicted in  FIGS. 2 ,  2   a  and  3 . 
         [0031]    As shown in perspective view in  FIGS. 4 and 4   a , aperture  35  is smooth and extends through tool engaging member ( 20 ) and into the cavity of tubular member  40 . As shown in  FIGS. 5 and 5   a , aperture ( 25 ) has a larger diameter which can be configured with a coupling section ( 48 ) that linearly extends from throughbore ( 37 ) and is configured to cooperatively engage with another pipe fitting to facilitate drainage as shown in  FIG. 1 . Coupling section ( 48 ) can be conventional NPT threading. 
         [0032]    Referring to  FIGS. 7 and 8  there is shown a screen ( 80 ) located directly below the end of the passageway of aperture ( 35 ). Screen ( 80 ) can be made of plastic, stainless steel, aluminum, or another non-corrosive material. Directly below the passageway is a channel ( 92 ) that receives the screen ( 80 ) therein. A fastener such as a spring loaded mechanism ( 95 ) can be disposed within channel ( 92 ) to allow the screen ( 80 ) to be securely fastened therein. Referring to  FIGS. 7   a  and  8   a  there is shown screen ( 80 ) which is installed below prior art drain plug ( 93 ) installed within aperture ( 25 ). 
         [0033]    While in use drain nipple ( 10 ,  12 ) is placed within the lowest gravity point within the electrical conduit with the aperture ( 25 ,  35 ) located facing downward which allows condensation such as oil, water and gas through aperture ( 25 ,  35 ) to drain as shown in  FIG. 1 and 1   a.    
         [0034]    While the preferred embodiments of the invention have been shown and described, modifications thereof can be made by one skilled in the art without departing from the spirit and teachings of the invention. The embodiments described herein are exemplary only and are not limiting. Many variations and modification of the invention and apparatus disclosed herein are possible and are within the scope of the invention. Accordingly, the scope of protection is not limited by the description set out above, but is only limited by the claims which follow, the scope including all equivalents of the subject matter of the claims.