Integrated suction scrubber and discharge separator for modular SKID mounted vapor recovery system

Abstract

Disclosed is an integrated suction scrubber and discharge separator suitable for isolating entrained fluids from a gas stream. The integrated suction scrubber and discharge separator is a modular component incorporated into a skid mounted vapor recovery system with other modular components necessary for operation of the skid mounted vapor recovery system.

Description

04928.00211INTEGRATED SUCTION SCRUBBER AND DISCHARGE SEPARATOR FOR MODULAR SKID MOUNTED VAPOR RECOVERY SYSTEMBACKGROUND

[0001] Production of natural gas from low pressure reservoirs commonly requires the use of vapor recovery systems to extract the natural gas and separate any entrained liquids from the natural gas. As reflected in FIG. 1, a gas stream enters the vapor recovery system and passes to a suction scrubber 2 where liquids are separated from the gas. Separated gas passes through line 5 to compressor 4. To ensure proper operation of compressor 4, a lubricating oil passes from a reservoir 7 through line 8 and regulator valve 9 to the compressor. As known to those skilled in the art, a portion of the lubricating oil subsequently becomes entrained in the separated gas stream and must be removed. Thus, as reflected in FIG. 1, gas with entrained lubricating oil passes from compressor 4 through line 10 to discharge separator 3. Discharge separator 3 separates the lubricating oil from the gas. The gas passes through the discharge outlet 11 while the lubricating oil passes from discharge separator 3 through line 12 and returns to reservoir 7. As depicted in FIG. 2, the separate arrangement of suction scrubber 2 and discharge separator 3 occupies a significant portion of the skid 14 supporting the vapor recovery system.SUMMARY

[0002] The present disclosure provides an integrated suction scrubber / discharge separator. The integrated unit may be housed in a single pressure vessel or the suction scrubber and discharge separator assemblies may be joined by welding or other convenient methods to provide the integrated unit. In the integrated unit, the discharge separator is position on over or on top of the suction scrubber. The suction scrubber assembly includes:a first fluid inlet providing fluid communication with an interior of the suction scrubber; a first fluid outlet located above the first fluid inlet and providing fluid communication with the interior of the suction scrubber;a first pressure boundary head located below the first fluid inlet, the pressure boundary head defining the lower end of a separated liquid chamber and the upper end of a first reservoir wherein a bottom of the suction scrubber assembly defines the lower end of the first reservoir;a conduit providing fluid communication between a first opening and a second opening, the conduit positioned in the reservoir.The discharge separator assembly includes:an upper end supporting a discharge outlet, the discharge outlet in fluid communication with a pay line;a second pressure head boundary positioned above the first fluid outlet of the suction scrubber assembly;a third fluid inlet, the third fluid inlet providing fluid access to an interior of the discharge separator assembly, the third fluid inlet configured to receive fluid from a compressor;a turbo-encabulator located such that fluid entering through the third fluid inlet will contact the turbo-encabulator;a lubricating oil reservoir located below the turbo-encabulator and having a bottom defined by the second pressure head boundary.

[0003] Additionally, the present disclosure provides the integrated suction scrubber / discharge separator as a component of a modular skid mounted vapor recovery system. The skid mounted system additionally includes: a scrubber pump; a motor driven compressor; a feed stream; a suction line providing fluid communication between a suction scrubber assembly and a scrubber pump; and, a compressor discharge line providing fluid communication between compressor and a discharge separator assembly. Each of the components making up the skid mounted system are modular in that each may be removed and replaced as needed.BRIEF DESCRIPTION OF THE DRAWINGS

[0004] FIG. 1 provides a prior art arrangement of a vapor recovery system which uses separate and distinct suction scrubber and discharge separator.

[0005] FIG. 2 provides a perspective view of a prior art system of a vapor recovery system with separate and distinct suction scrubber and discharge separator.

[0006] FIGS. 3A and 3B provide opposing side views of a skid mounted of a vapor recovery system with an integrated suction scrubber / discharge separator.

[0007] FIG. 4 is a partial cut-away side view of the integrated suction scrubber / discharge separator.

[0008] FIG. 5 is a top view of the integrated suction scrubber / discharge separator.

[0009] FIG. 6 is a perspective ghost view of the integrated suction scrubber / discharge separator.

[0010] FIG. 7 is a perspective ghost view of the integrated suction scrubber / discharge separator at an angle different from that of FIG. 6.

[0011] FIG. 8 is a schematic view of the skid mounted of a vapor recovery system with an integrated suction scrubber / discharge separator.

[0012] FIGS. 9A, 9B and 9C depict the turbo-encabulator component used within the integrated suction scrubber / discharge separator.DETAILED DESCRIPTION

[0013] The drawings included with this application illustrate certain aspects of the embodiments described herein. However, the drawings should not be viewed as exclusive embodiments. The subject matter disclosed is capable of considerable modifications, alterations, combinations, and equivalents in form and function, as will occur to those skilled in the art with the benefit of this disclosure.

[0014] The present disclosure may be understood more readily by reference to these detailed descriptions. For simplicity and clarity of illustration, where appropriate, reference numerals may be repeated among the different figures to indicate corresponding or analogous elements. The following description is not to be considered as limiting the scope of the embodiments described herein. The drawings are not necessarily to scale and the proportions of certain parts may have been exaggerated to better illustrate details and features of the present disclosure. Also, the phraseology and terminology employed herein is for the purpose of description and should not be regarded as limiting except where indicated as such.

[0015] Throughout this disclosure, the terms “about”, “approximate”, and variations thereof, are used to indicate that a value includes the inherent variation or error for the device, system, or measuring method being employed as recognized by those skilled in the art.

[0016] An improved vapor recovery system 100 having modular construction supported by a skid 101 will be described with reference to FIGS. 3A through 9C. In one aspect, vapor recovery system 100 includes an integrated suction scrubber and discharge separator 200. As described in more detail below, integrated suction scrubber and discharge separator 200 reduces the footprint normally required by separate suction scrubbers and discharge separators. In another aspect, the configuration of the integrated suction scrubber and discharge separator 200 enhances recovery of lubricating oil from the hydrocarbon stream treated by vapor recovery system 100. The following discussion describes integrated suction scrubber and discharge separator 200 as havinga pressure vessel 241 and a suction scrubber shell 211 joined together by welding or other method. However, a single pressure vessel with appropriate dividers may house both components of integrated suction scrubber and discharge separator 200, i.e. the suction scrubber 210 portion and the discharge separator 240 portion share a single vessel. In general, suction scrubber 210 and discharge separator 240 are prepared as separate components but in the final assembly share pressure boundary 242 thereby providing a single vessel with a separation of functions, i.e. an integrated suction scrubber / discharge separator 200.

[0017] With continued reference to the FIGS, a skid 101 supports the components of vapor recovery system 100. The components of vapor recovery system 100 are well known to those skilled in the art. Briefly, the modular components include a scrubber pump 104, a motor driven compressor 106, a control panel 120 and associated fluid flow lines as described below for conveying fluids to the units supported by skid 101. Additionally, integrated suction scrubber and discharge separator 200 is a modular component. All modular components are removable and replaceable.

[0018] Feed stream line 102 receives fluid from a well containing natural gas and entrained liquids. Feed stream line 102 is in fluid communication with suction scrubber 210. Suction scrubber 210 is located within suction scrubber shell 211. Suction scrubber 210 includes a first fluid inlet 212 in fluid communication with feed stream line 102. Additionally, suction scrubber 210 carries a first gas outlet 214. First gas outlet 214 is positioned at an elevation above first fluid inlet 212. An optional vane pack 216 is located within the interior of suction scrubber 210 between first fluid inlet 212 and first gas outlet 214. When vane pack 216 is present, a support ring 218 will commonly be used to retain vane pack 216 at a desired location. As depicted, vane pack 216 is generally above first fluid inlet 212. Vane pack 216 aids in the separation of entrained liquids from the received gas stream by acting as a coalescing surface for the entrained liquids.

[0019] A first pressure boundary head 232 is located below vane pack 216 and first fluid inlet 212. Pressure head boundary 232 defines the lower end of a separated liquid chamber 234 and the upper end of a glycol reservoir 230. The bottom of suction scrubber / gas discharge separator 200 defines the lower end of glycol reservoir 230. Glycol reservoir 230 has a glycol inlet 226 providing fluid communication between the interior and exterior of glycol reservoir.

[0020] Suction scrubber 210 may also include common components such as sight glasses 217, pressure relief vents 228 and manual drain 229b. To permit collection of isolated liquids, suction scrubber includes a liquid outlet 235. Conduit 122 provides fluid communication between liquid outlet 235 and scrubber pump 104. Scrubber pump 104 may be managed by any convenient means via control panel 120 such that liquids are automatically drawn down upon reaching a predetermined level within suction scrubber 210. Scrubber pump 104 conveys the liquids to a reservoir or collection system, not shown.

[0021] The embodiment of FIG. 4 depicts one example of liquid level sensor 215a suitable for controlling operation of scrubber pump 104. In this embodiment, pump activation switch 215a activates scrubber pump 104 upon detection of fluid levels above a preset limit and will turn off scrubber pump 104 when fluid levels drop below the preset limit. Thus, switch 215a maintains a desired level of fluids within separated liquid chamber 234. To protect integrated suction scrubber and discharge separator 200 from a build-up of excess fluid within separated liquid chamber 234 due to failure of scrubber pump 104, fluid level switch 215b acts as a safety switch which will shut down integrated suction scrubber and discharge separator 200 upon detection of liquid levels above a preset limit. Excess fluid level switch 215b will generally be activated only in the event of the failure of scrubber pump 104.

[0022] Additionally, as described below, compressor oil inlet 224a and compressor oil outlet 224b are in fluid communication with conduit 225. Conduit 225 is located within glycol reservoir 230. Thus, glycol reservoir 230 acts as a heat sink which transfers heat from a fluid passing through conduit 225 to pressure boundary head 232 and subsequently to liquids collected within separated liquid chamber 234 of suction scrubber 210. This configuration precludes freezing of liquids within separated liquid chamber 234. Suction scrubber 210 also includes a port 219 which provides fluid communication with gas discharge line 112 of suction scrubber 240 via line 221. Fluid communication with discharge line 112 is controlled by recycle valve 239. Recycle valve 239 is also in fluid communication with port 237 located on discharge separator 240 via sensing line 238. Recycle valve 239 may include an integrated pilot or is associated with a standalone pilot, not shown, in either case the pilot responds to pressure as monitored at port 237 via sensing line 238 within suction scrubber 210. If pressure within suction scrubber 210 is above a pre-set limit, then recycle valve 239 is closed and compressor 106 will pull gas from suction scrubber 210 via port 214. If pressure in suction scrubber 210drops below a predetermined limit, then recycle valve 239 opens permitting gas to flow from discharge line 112 into suction scrubber 210. Thus, recycle valve 239 allows the operator to set a desired pressure within separated liquid chamber 234.

[0023] Gas separated by suction scrubber 210 exits via first gas outlet 214 and passes through line 213 to gas inlet port 109 of compressor 106. In addition to gas inlet port 109, compressor has lubrication inlet port 107 and gas outlet port 108. Gas outlet port 108 is in fluid communication with discharge separator 240 via conduit 110 and discharge separator inlet 262.

[0024] Discharge separator 240 provides the ability to recover lubricating oil used by compressor 106. Discharge separator 240 may have a distinct shell 241 or may share a single pressure vessel with suction scrubber 210. As known to those skilled in the art, discharge separator will also have sight glass(es) 217, manual drain 229a and lubricating oil fill port 264a and lubricating oil drain port 264b.

[0025] During operation of compressor 106, lubricating oil passes from lubricating oil reservoir 236 through outlet 256 to oil inlet 224a via conduit 258. Lubricating oil passes through glycol reservoir 230 within conduit 225 and exits via outlet 224b into conduit 114 which provides fluid communication with oil cooler 124. Directional flow of lubricating oil from conduit 114 into oil cooler 124 and / or conduit 227 is managed by a thermostatic valve 116. Thermostatic valve 116 is a three-way control valve which directs fluid either to oil cooler 124, to conduit 227 or provides a blend of fluid from conduit 114 and oil cooler 124 to conduit 227. Thermostatic valve 116 has an opening temperature of 230°F with a manufacturer specified tolerance of + / - 10°F. If the lubricating oil in conduit 114 is above the opening temperature, then lubricating oil flows to oil cooler 124. If the lubricating oil is at or near the opening temperature, then a portion of the lubricating oil passes through oil cooler 124 and a portion passes directly to conduit 227. If the lubricating oil is below the opening temperature, then thermostatic valve 116 passes the lubricating oil from conduit 114 to conduit 227. Once in conduit 227, the lubricating oil, now at the thermostatic valve opening temperature of 230°F + / - 10 degrees, passes to compressor inlet port 107. Lubricating reservoir 236 is normally under pressure. The pressure applied to lubricating reservoir 236 will depend on the pressure within sales line 112 and the operational condition of compressor 106. Typically, lubricating reservoir 236 will be under a pressure between about 551.6 kPa (80 psi) and 827.4 kPa (120 psi). However, lubricating reservoir 236 may operate at a range of about 40 psi to about 230 psi.

[0026] Lubricating oil delivered to compressor 106 passes through one or more injection points, not shown, to be delivered to bearings and shaft seals with compressor 106. Additionally, oil passes to the rotor housing and floods the internal rotors, not shown, where it acts as a viscous material sealing the clearances between the rotors and the compressor housing. The oil also provides a cooling effect as it absorbs heat produced by compressor operation. Thus, the lubricating oil enhances the operation of compressor 106; however, a portion of the lubricating oil also becomes entrained within the compressed gas. Therefore, the lubricating oil must be separated from the compressed gas prior to conveying the gas to sales line 112. Thus, the compressed gas, with entrained lubricating oil, passes from outlet port 108 via conduit 110 to inlet 262 of discharge separator 240.

[0027] Discharge separator 240 includes components for separating and recovering lubricating oil from the compressed gas. Discharge separator 240 also acts as lubricating reservoir 236 with the bottom of lubricating reservoir defined by a second pressure boundary head 242. Second pressure head boundary 242 may also define the separation point between discharge separator 240 and suction scrubber 210. Positioned above second pressure head boundary 242 is lubricating oil outlet port 256. As discussed above outlet port 256 will generally permit a constant flow of lubricating oil from lubricating oil reservoir 236 to compressor 106.

[0028] Additionally, discharge line 112 of discharge separator 240 provides protection to suction scrubber 210 when the volume of gas entering suction scrubber 210 through inlet 212 is lower than a predetermined desired volume. Thus, integrated suction scrubber and discharge separator 200 includes a safety mechanism which maintains operational pressure within suction scrubber 210 at a desired target pressure. In most instances when operating under vapor recovery conditions, the pressure within suction scrubber 210 will normally be at least slightly positive.

[0029] In the embodiment of FIG. 4, discharge separator 240 provides enhanced separation of lubricating oil from the compressed gas by incorporation of a unique component which enhances separation of entrained lubricating oil from the compressed gas by imparting a downward swirling motion to the compressed gas, with entrained lubricating oil, after passing through inlet 262. For sake of conciseness in describing the operation of this unique component and the operations of discharge separator 240 this unique device is identified as a turbo-encabulator 300. Turbo-encabulator 300 is positioned in the interior of discharge separator 240and is located to receive the incoming gas stream with entrained lubricating oil. Turbo-encabulator 300 has a shell or body 301 which defines an interior passage and supports a top ring 302. Top ring 302 carries a top hat 304 secured by a nut / bolt assembly 306 or other convenient arrangement to top ring 302. Top ring 302 carries a downwardly extending plate 312. Plate 312 extends downward to a location below inlet port 262. In some embodiments, top ring 302 will be located at a point corresponding to the top of inlet port 262 and the lower end of plate 312 will correspond to the bottom of inlet port 262. Thus, plate 312 will have a length generally corresponding to the diameter of inlet port 262. A helical plate 314 extends from the lower end of plate 312 and continues a downward spiral around shell 301. Additionally, a mist pad 308 is supported within shell 301 by support plate 310.

[0030] Thus, the configuration of turbo- encabulator 300 alters the normal flow of gas through discharge separator 240. The induced flow path provided by turbo-encabulator 300 differs from the fluid flow path created by a hydro-cyclone separator. As known to those skilled in the art, hydro-cyclones have an interior conical shaped chamber. This interior chamber has two outlets. Fluid enters the chamber and is spun resulting in separation of components based on mass wherein the heavier phase moves to the chamber wall to be discharged out the bottom of the separator while the lighter phase moves to the center and passes upward. Thus, separation and discharge take place within the same chamber. In contrast, turbo-encabulator imparts a downward and circular flow to the incoming gas stream. Passing between the exterior of turbo-encabulator 300 and the interior wall of discharge separator 240, the downward, circular flow enhances separation of lubricating oil from the gas as oil droplets which mostly drop downward to lubricating oil reservoir 236. After the gas stream exits at the bottom of turbo-encabulator 300, oil droplets continue moving downward to reservoir 236 while the gases subsequently reverse direction and move upward through the interior of turbo-encabulator 300. As the gases move upward, they encounter mist pad 308 which provides a condensation surface within turbo-encabulator 300 to further aid in separation of lubrication oil from gas passing upward through turbo-encabulator 300 towards gas outlet 246. At least a portion of oil remaining in the gas stream condenses or coalesces on mist pad 308 until the gathered oil is a quantity sufficient to drop to lubricating oil reservoir 236 below.

[0031] To further enhance separation of lubricating oil from the gas, discharge separator may optionally include an additional coalescing filter 248 positioned between turbo-encabulator 300and discharge outlet 246. Coalescing filter 248 may be supported above turbo-encabulator 300 by any convenient arrangement. To provide one example, the embodiment depicted in FIG. 4 provides coalescing filter 248 with a top brim 248a. Coalescing filter 248 extends upward through a reducer 254. The top of reducer 254 carries a first flange 252b. A second flange 252a is bolted to first flange 252b with top brim 248 sandwiched between flanges 252a, 252b. Second flange 252 a supports gas outlet 246. Gas outlet 246 provides fluid communication between discharge separator 240 and sales line 112.

[0032] In operation, vapor recovery system 100 receives a feed stream via line 102. The feed stream typically contains natural gas and some entrained liquid hydrocarbons and possibly entrained water. Suction scrubber 210 receives the feed stream at gas inlet 212 and separates the entrained liquids from the natural gas component in a manner known to those skilled in the art. During operation of vapor recovery system 100, the pressure of the gas entering integrated suction scrubber and discharge separator 200 at gas inlet 212 is monitored by a sensor, not shown, which provides data to control panel 120. Gas entering at gas inlet 212 passes upward through vane pack 216. Vane pack 216 provides additional separation of liquids from the gas as vane pack 216 acts as a condensation surface. Gas, substantially free of entrained liquids, passes out of suction scrubber 210 through gas outlet 214 and passes to gas inlet port 109 of compressor 106. Separated liquids are pulled from suction scrubber 210 through outlet 235 by pump 104. Pump 104 operates to remove liquids whenever the level of liquids within separated liquid chamber 234 reaches a predetermined level as determined by switch 215a.

[0033] Operation of compressor 106 requires the addition of lubricating oil. Compressor 106 receives lubricating oil from lubricating oil reservoir 236 found in discharge separator 240. In one embodiment, lubricating oil passes from lubricating oil reservoir 236 via outlet port 256 through conduit 258 to port 224a located in glycol reservoir 230. As described above, a glycol reservoir 230 is found at the lower end of suction scrubber 210. Lubricating oil passes through a conduit 225 located within glycol reservoir 230 and exits through port 224b into conduit 114. Lubricating oil within reservoir 236 is heated by operation of compressor 106. As the lubricating oil passes through glycol reservoir 230 a portion of that heat passes to the stored glycol and pressure boundary head 232 thereby maintaining the fluids within separated liquid chamber 234 at a temperature sufficient to preclude freezing and allowing for efficient removal of liquids from separated liquid chamber 234 by scrubber pump 104. As noted above, after the lubricating oilexits through port 224b, it passes to thermostatic control valve 116 which control flow through cooler 124 and / or into conduit 227.

[0034] Due to the configuration of compressor 106, lubricating oil injected into compressor 106 for lubrication, gas cavity sealing and thermal transfer becomes mixed with the gas during compression operations. As a result, the compressed gas discharged from the compressor contains entrained oil that must be separated and recovered prior to the gas entering line 112 for communication to a collection system, not shown. Therefore, prior to sending the compressed gas into the payline, the gas passes from compressor outlet port 108 via discharge line 110 to inlet port 262 of discharge separator 240.

[0035] Inlet port 262 is aligned such that gas passing into discharge separator 240 encounters turbo-encabulator 300. The configuration of turbo-encabulator 300 is described above. With reference to FIGS. 6-7 and 9A-C, turbo-encabulator imparts a downward circular motion to the incoming gas stream. Thus, the gas is diverted from the normal upward path through discharge separator 240 and forced downward around the exterior of turbo-encabulator 300. As the gas moves around turbo-encabulator 300, the swirling motion enhances separation of entrained lubricating oil from the gas. The separated lubricating oil drops from the gas stream to the lubricating oil reservoir 236 located below turbo-encabulator 300. The gas stream then passes upward through the interior shell 301 of turbo-encabulator 300. As the gas passes through shell 301 it encounters mist pad 308. Mist pad 308 provides a condensation surface which further removes lubricating oil from the flowing gas. Gas exits turbo-encabulator 300 through top ring 302 and encounters coalescing filter 248 at the upper end of discharge separator 240. Any remaining lubricating oil is removed by coalescing filter 248 and drops to the lubricating oil reservoir 236 below. Thus, gas substantially free of liquids then passes through gas outlet 246 to gas discharge line 112.

[0036] During operation of vapor recovery system 100, as gas volume increases from the source, a pressure increase will be detected. As a result, control panel 120 will increase the operational speed of compressor 106. As the speed of compressor 106 increases, more gas will be drawn through gas inlet 212 into suction scrubber 210 and ultimately discharged to gas discharge line 112. Those skilled in the art commonly refer to gas discharge line 112 as a payline. If gas volume from the source decreases, a corresponding drop in pressure will be detected at or in a line associated with gas inlet 212. Control panel 120 will respond to the dropin pressure by directing a reduction in operational speed of compressor 106 to maintain a predetermined gas pressure at gas inlet 212 and within separated liquid chamber 234 of suction scrubber 210. In the event that the gas source produces a volume less than the flowing capacity corresponding to compressor’s 106 minimum speed, pressure within suction separated liquid chamber 234 of suction scrubber 210 will continue to drop. For most operations of vapor recovery system 100 a vacuum within separated liquid chamber 234 of suction scrubber 210 should be avoided. Thus, at a predetermined pressure that is less than the pressure of the gas source, recycle valve 239 will open to reduce gas flow to gas discharge line 112 and return at least a portion of gas flowing from gas outlet 246 to separated liquid chamber 234 of suction scrubber 210 via line 221.

[0037] Gas return to separated liquid chamber 234 of suction scrubber 210 occurs when recycle valve 239 opens in response to a drop in pressure within sensing line 238. As discussed above, recycle valve 239 includes an integrated pilot or a separate pilot associated with recycle valve 239 and sensing line 238. Movement of the pilot controls the operation of recycle valve 239. Thus, when pressure within sensing line 238 is at a predetermined value less than the gas pressure at inlet 212, recycle valve 239 opens and allows flow from discharge line 112 through recycle valve 239 into separated liquid chamber 234 of suction scrubber 210 via port 219. As a result of the gas returning to separated liquid chamber 234 of suction scrubber 210, further draw down of gas from the source providing gas to inlet 212 is slowed and / or stopped. The configuration of integrated suction scrubber and gas discharge separator 200 provides the ability to operate with no flow of gas into gas inlet 212, i.e. the system is capable of 100% return of separated gas from discharge separator 240 to separated liquid chamber 234 of suction scrubber 210. This recycle of gas is also known as turndown in the industry.

[0038] As a further safeguard, should operation of recycle valve 239 fail to achieve the desired 100% turndown leading to a continued reduction of gas source pressure at inlet 212 until the sensed pressure is at or less than a predetermined shutdown setpoint, control panel 120 will place vapor recovery system into a standby mode. The gas source returns to a pressure at or above the predetermined shutdown setpoint and continues to a predetermined starting pressure, control panel 120 will automatically restart vapor recovery system 100 and integrated suction scrubber and discharge separator 200.

[0039] Other embodiments of the present invention will be apparent to one skilled in the art. As such, the foregoing description merely enables and describes the general uses and methods of the present invention. Accordingly, the following claims define the true scope of the present invention.

Claims

What is claimed Is:

1. An integrated suction scrubber / discharge separator (100) comprising:a suction scrubber assembly (210), the suction scrubber assembly comprises: a first fluid inlet (212) providing fluid communication with an interior of the suction scrubber;a first fluid outlet (214) located above the first fluid inlet and providing fluid communication with the interior of the suction scrubber;a first pressure boundary head (232) located below the first fluid inlet, the pressure boundary head defining the lower end of a separated liquid chamber (234) and the upper end of a first reservoir (230) wherein a bottom of the suction scrubber assembly defines the lower end of the first reservoir;a conduit (225) in fluid communication with a first opening (224a) and a second opening (224b), the conduit positioned in the reservoir (230); a discharge separator assembly (240) located above the suction scrubber assembly and integrally secured to the suction scrubber assembly, the discharge separator assembly comprises:an upper end supporting a discharge outlet (246), the discharge outlet in fluid communication with a pay line (112);a second pressure head boundary (242) positioned above the first fluid outlet (214) of the suction scrubber assembly;a third fluid inlet (262), the third fluid inlet providing fluid access to an interior of the discharge separator assembly, the third fluid inlet configured to receive fluid from a compressor (106);a turbo-encabulator (300) located such that fluid entering through the third fluid inlet will contact the turbo-encabulator;a lubricating oil reservoir (236) located below the turbo-encabulator and having a bottom defined by the second pressure head boundary (242).

2. The integrated suction scrubber / discharge separator of claim 1, further comprising:an outlet (256) located above the second pressure head boundary;a conduit (114) in fluid communication with the outlet (256) located above the second pressure head boundary and the first opening (224a) of conduit (225).

3. The integrated suction scrubber / discharge separator of claim 1, further comprising: a coalescing filter (248) positioned above the turbo-encabulator and below the discharge outlet.

4. The integrated suction scrubber / discharge separator of claim 1, further comprising:a vane pack positioned within the suction scrubber assembly at a location between the first fluid inlet and the first fluid outlet such that fluid passing from the first fluid inlet must pass through the vane pack prior to reaching the first fluid outlet.

5. The integrated suction scrubber / discharge separator of claim 1, further comprising:a mist pad positioned within the turbo-encabulator.

6. A skid mounted vapor recovery system comprising:the skid (101);a scrubber pump (104) supported by the skid;a motor driven compressor (106) supported by the skid;an integrated suction scrubber / discharge separator unit (200) supported by the skid; a feed stream line (102);a suction line (122) providing fluid communication between a suction scrubber assembly (210) and a scrubber pump (104);a compressor discharge line (110) in fluid communication between compressor (106) and a discharge separator assembly (240);the integrated suction scrubber / discharge separator unit comprising:the suction scrubber assembly (210) positioned in the lower portion of the pressure vessel, the suction scrubber assembly comprises:a first fluid inlet (212) providing fluid communication between the feed stream line (102) and an interior of the suction scrubber;a first fluid outlet (214) located above the first fluid inlet, the first fluid outlet in fluid communication with the suction line and the suction line in fluid communication with the pump;a first pressure boundary head (232) located below the first fluid inlet, the pressure boundary head defining the lower end of a separated liquid chamber (234) and the upper end of a reservoir (230) wherein abottom of the suction scrubber assembly defines the lower end of the reservoir;a conduit (225) providing fluid communication between a first opening (224a) and a second opening (224b), the conduit positioned in the reservoir (230);the first opening (224a) providing fluid communication with a lubricating oil reservoir (236)the second opening (224b) providing fluid communication with the compressor (106);discharge separator assembly (240) located above the suction scrubber assembly and integrally secured to the suction scrubber assembly, the discharge separator assembly comprises:an upper end defined supporting a discharge outlet (246), the discharge outlet in fluid communication with a pay line (112);a second pressure head boundary (242) positioned above the first fluid outlet of the suction scrubber assembly;a third fluid inlet (262), the third fluid inlet providing fluid access to an interior of the discharge separator assembly and the third fluid inlet in fluid communication with compressor discharge line (110);a turbo-encabulator (300) located positioned such that fluid entering through the third fluid inlet will contact the turbo-encabulator; the lubricating oil reservoir (236) located below the turbo- encabulator and having a bottom defined by the second pressure head boundary (242);a liquid outlet (256) located above the second pressure head boundary;a lubricating oil transfer line (114) providing fluid communication between the separated liquid outlet (256) and the first opening (224a).

7. The skid mounted suction scrubber / discharge separator (100) of claim 6, wherein each of the pump (104) supported by the skid, the compressor (106) supported by the skid and the integrated suction scrubber / discharge separator unit (200) supported by the skid are modular units configured to be individually removed from the skid and replaced as needed.

8. The integrated suction scrubber / discharge separator of claim 6, further comprising: a coalescing filter (248) positioned above the turbo-encabulator and below the discharge outlet.

9. The integrated suction scrubber / discharge separator of claim 6, further comprising:a vane pack positioned within the suction scrubber assembly at a location between the first fluid inlet and the first fluid outlet such that fluid passing from the first fluid inlet must pass through the vane pack prior to reaching the first fluid outlet.

10. The integrated suction scrubber / discharge separator of claim 6, further comprising:a mist pad positioned within the turbo-encabulator.

11. The integrated suction scrubber / discharge separator of claim 6, further comprising:a pressure vessel housing both the suction scrubber and discharge separator.

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