Skid for compressor
TECHNICAL FIELD OF THE INVENTION 
     This invention relates to mounting of a reciprocating compressor and power source for use in a remote location. 
     BACKGROUND OF THE INVENTION 
     A frequent need arises for placing a reciprocating compressor and driving engine in a remote location. Over the years, a number of skids have been designed on which the compressor and engine are mounted. The skids and equipment mounted thereon are transportable by truck to the remote location. The skid is then positioned at the location and forms the base for the equipment. 
     To the extent possible, the skid should be self-contained and self-sustaining due to the remote location at which most skid units are installed. Further, the skid should be designed for ease of installation and maintenance for efficiency. Despite the use of a number of skid designs in the industry, a need still exists for an improved design which provides the desired characteristics noted above to the fullest extent possible. 
     SUMMARY OF THE INVENTION 
     In accordance with one aspect of the present invention, a compressor skid is provided which includes a mainframe having a width and a length for mounting a compressor and a power source. At least one side wing is attached to the mainframe to extend the width of the mainframe. 
     In accordance with another aspect of the present invention, the mainframe is made up of a plurality of longitudinal beams and lateral beams, each of the beams having an upper surface. An upper deck is attached to the upper surface of the beams in a center portion of the upper deck. Grating is attached to the upper surface of the beams on a first side portion and a second side portion on opposite sides of the center portion. 
     In accordance with another aspect of the present invention, at least one tank is mounted at the end of the mainframe for containing waste fluid. Structure is used to drain fluids from the engine directly to the waste fluid tank. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     For a more complete understanding of the present invention and for further advantages thereof, reference is now made to the following description of the preferred embodiment, taken in conjunction with the accompanying drawings, in which: 
     FIG. 1 is a perspective view of a skid forming a first embodiment of the present invention having a compressor and engine mounted thereon; 
     FIG. 2 is a plan view of the skid of FIG. 1; 
     FIG. 3 is a side view in partial cross-section of the skid taken along line 3--3 in FIG. 2; 
     FIG. 4 is a detail cross-sectional view of the waste fluid tank; 
     FIG. 5 is a detail view of the bolted attachment between the mainframe and side wings; and 
     FIG. 6 is a detail view of a lifting eye. 
    
    
     DETAILED DESCRIPTION 
     With reference now to FIGS. 1 and 2, a skid 10 forming a first embodiment of the present invention is illustrated. The skid 10 is designed to mount a compressor 12, a power source, typically natural gas engine 14, a series of scrubbers 16, and a cooler (not shown) for cooling the engine and gas. As will be discussed subsequently, the skid 10 includes a mainframe 20 and first and second detachable side wings 22 and 24. This permits the mainframe 20 to have a width W which is the maximum permissible for trailering on the highway typically 14 feet. However, when side wings 22 and 24 are installed on site, the skid will be as wide as the combination of the width of the mainframe and the two side wings for enhanced stability and flexibility. 
     The mainframe includes a pair of longitudinal main beams 26 and 28 which are preferably about 24 inches high and have a length of approximately 43 feet. Lateral beams 30, 32, 34, 36, and 38 extend between the main beams 26 and 28 and are welded thereto. The lateral beams preferably have a height of about 18 inches to 24 inches depending on the weight of the equipment supported. The length of beams 30-38 vary depending on the footprint geometry of the compressor and engine. Generally, a three foot beam length is a minimum that would be used due to lifting stability when loading and off-loading the compressor package. The upper surface of beams 30-38 are flush with the upper surface of beams 26 and 28. Lateral beams 40, 42, 44, 46, and 48 also extend between the main beams 26 and 28, generally toward the ends of the beams, and preferably have a height of 24 inches and a length of about 3 feet. The upper surface of beams 40-48 are flush with the upper surface of beams 26 and 28. The lateral beams 46 and 48 and main beams 26 and 28 (with plates 162) form a waste oil tank drain 52 at the first end 54 of the skid 10. A drain spout 56 is mounted to and extends through a portion of lateral beam 48 to drain the tank. 
     Lateral beams 58 and 60 extend on a first side 62 of the mainframe 20 at the first end 54 and, along with a longitudinal element formed of two sections of 12 inch high rectangular tubing 64a and 64b (and plate 162), define a waste glycol-water tank 66 and a pressure packing vent tank 68. Drain spouts 70 and 72 enter the tanks 66 and 68, respectively. Lateral beams 58 and 60 are preferably 24 inches high. 
     Lateral beams 74, 58, 78 and 80 extend outwardly from each of the ends 54 and 82 on the first side 62 and the second side 84 at the corners of the skid. Each of beams 74, 58, 78 and 80 are preferably 24 inches high. From longitudinal main beam 28 extend a series of lateral beams 86-96. From main beam 26 extend a series of lateral beams 98-108. Longitudinal beam 110 interconnects lateral beams 88, 90 and 92 while longitudinal beam 112 connects lateral beams 100, 102 and 104. Each of the beams 86-112 are preferably 6 inches high with their bottom flange co-planar with the bottom flange of the main beams 26 and 28. 
     On the second side 84, a pair of channels 114 and 116 are welded one on top of the other and welded to lateral beams 86-96 and beams 78 and 80. A pair of channels 118 and 120 are welded one on top of the other and to the ends of lateral beams 98-108 and beams 74 and 58. The channels are preferably 12 inches wide. 
     pipes 122 and 124 are mounted between each of the main beams 26 and 28 at the first end 54 and the second end 82 to provide protection and a lifting point for the skid. 
     A waste oil discharge line 126 extends along main beam 26 from the waste oil tank 52 to a series of couplings 128 for draining waste engine oil from the engine 14 and the compressor 12. 
     As best seen in FIG. 4, a series of three angles 130, 132 and 134 are mounted to the bottom of the waste glycol-water tank 66 to provide for stiffening of the bottom tank plate when the tank is filled. 
     Between the main beam 26 and main beam 28, on the top and bottom surfaces thereof, are mounted plates 136, preferably having a thickness of 3/16 inches. The plates are designed to fit about the compressor 12, engine 14, scrubber 16 and cooler mounted on the skid. 
     Each of the side wings 22 and 24 is made up of a longitudinal pair of channels 138 and 140 which are welded one atop the other. Side wings 22 and 24 are bolted to the longitudinal channels 114-120 of the mainframe by a series of bolts 142, washers 144 and nuts 146 as best seen in FIG. 5. Each of the channels preferably has a height of 12 inches to form a total height of 24 inches. 
     At the ends of the channels 138 and 140 extend lateral beams 148 and 150, preferably 24 inches high. Welded at the ends of the beams 148 and 150 is a longitudinal beam 152, preferably having a height of 24 inches. Between the beams 152 and channels 138 and 140 are welded a series of smaller lateral beams 154, preferably having a height of about 6 inches with their lower surface co-planar with the lower surface of the longitudinal beam 152 and channel 138. 
     Grating 156 is mounted between the lateral channels 114 and 120 and the main beams 26 and 28 on the mainframe and between the longitudinal beams 152 and channels 140 on the side wings 22 and 24 for the whole length of the skid with the top surface of the grating flush with the upper surface of the beams. 
     The volume between main beams 26 and 28 and between lateral beams 42 and 44 can be filled with concrete 160 to provide stability to the skid. 
     plates 163 can be welded at corners of the skid with holes 164 formed therethrough to form lifting eyes. 
     It will be noticed from FIG. 1 that generally all piping is run underneath the gratings or plates to provide an uncluttered appearance to the skid, which enhances the safety of operation and ease of maintenance. In association with this, the drain line 126 permits fluids to be drained from the engine and compressor directly into storage tanks, reducing the opportunity for oil and other slippery fluids to cover the top of the skid, forming a dangerous work surface. The use of the plating provides a walkway between the scrubbers 16 and the compressor 12 and between the engine 14 and the cooler 18 to provide easy maintenance. The compressor and the engine can either be bolted to the plates without the use of grout or the compressor can be grouted into the skid as desired. The jack shaft will be located under the grating with a low rotating center line to provide for a low center of gravity and maintenance accessibility to the front of the engine. 
     In one design constructed in accordance with the teachings of the present invention, the width W of the mainframe 20 is just under 14 feet. The width of the side wings 24 and 22 is about 3 feet. The total length of the skid is about 43 feet. 
     The skid can also have a weather enclosure to enclose all of the equipment and a bridge crane option, if desired. 
     The air cooler mounted on the skid will mount on the engine end of the skid above the drain tanks and is supported by the beams 46, 48, 58, 60, 61 and 80. 
     The length of the skid can vary from approximately 32 feet to 48 feet depending on the size of the engine, compressor and related equipment mounted on the skid. 
     An electric motor driven compressor is used instead of a natural gas driven compressor and an oil drain for the compressor is still provided. The oil lubrication system for a compressor is similar to that of an engine and oil must be changed on the compressor as well. 
     Although the present invention has been described with respect to a specific preferred embodiment thereof, various changes and modifications may be suggested to one skilled in the art, and it is intended this present invention encompass such changes and modifications as fall within the scope of the appended claims.