This disclosure relates in general to reciprocating pumps and, more particularly, to a dual circuit lubrication system to lubricate and cool rolling and sliding surfaces of a power end of a reciprocating pump assembly.
Large pumps are commonly used for mining and oilfield applications, such as, for example, hydraulic fracturing. During hydraulic fracturing, fracturing fluid (i.e., cement, mud, frac sand and other material) is pumped at high pressures into a wellbore to cause the producing formation to fracture. One commonly used pump in hydraulic fracturing is a high pressure reciprocating pump, like the SPM® QWS 3500 frac pump, manufactured by S.P.M. Flow Control, Inc. of Fort Worth, Tex. In operation, the fracturing fluid is caused to flow into and out of a pump housing having a fluid chamber as a consequence of the reciprocation of a piston-like plunger respectively moving away from and toward the fluid chamber. As the plunger moves away from the fluid chamber, the pressure inside the chamber decreases, creating a differential pressure across an inlet valve, drawing the fracturing fluid through the inlet valve into the chamber. When the plunger changes direction and begins to move towards the fluid chamber, the pressure inside the chamber substantially increases until the differential pressure across an outlet valve causes the outlet valve to open, enabling the highly pressurized fracturing fluid to discharge through the outlet valve into the wellbore.
A typical reciprocating pump includes multiple lubrication systems: a fluid end lubrication system that lubricates and cools the bearing surfaces of a fluid end, and a power end lubrication system that lubricates and cools the rolling and sliding of, for example bearing, surfaces of a power end. In the power end, it can be beneficial to supply some rolling and sliding surfaces with a higher pressure of lubrication fluid than other rolling and sliding surfaces. In present systems, however, the rolling and sliding surfaces of the power end are lubricated by the same lubrication circuit and thus, are generally lubricated at the same lubrication fluid pressure.
In operation, the pressure of the lubrication fluid received by a particular surface depends on the flow of lubrication fluid from the lube pump and the resistance to the flow created by the outlets in the lubrication circulating system. Because some components, such as roller bearings and gears, have lubrication fluid (i.e., oil) flowing out at approximately atmospheric pressure, the single circuit lubrication system oftentimes fails to provide sufficient lubrication fluid pressure and flow to ensure that all parts, especially sliding surfaces, which can require a higher lubrication fluid pressure, are properly lubricated. In order to ensure adequate lubrication of the power end, the required lubrication pressure and flow rate to all of the rolling and sliding surfaces is increased; however, such increases create inefficiencies in the power end lubrication system and thus, inefficiencies in the operation of the reciprocating pump.
In a first aspect, there is provided a dual circuit lubrication system for a power end of a reciprocating pump that includes a lubrication pump that supplies lubrication fluid to a high pressure lubrication circuit and a low pressure lubrication circuit. The high pressure lubrication circuit is fluidly coupled to a crankshaft to supply lubrication fluid to sliding surfaces associated with the crankshaft at a first lubrication fluid pressure. The crankshaft drives a crosshead coupled to a plunger to displace fluid from a fluid end of the reciprocating pump. The low pressure lubrication circuit is fluidly coupled to supply the lubrication fluid to a plurality of rolling surfaces associated with the crankshaft at a second lubrication fluid pressure. The first lubrication fluid pressure is greater than the second lubrication fluid pressure.
In certain embodiment, the first lubrication fluid pressure is at least 1.5 times the second lubrication fluid pressure.
In certain embodiments, the high pressure lubrication circuit supplies the lubrication fluid to a bottom portion of the crosshead.
In other certain embodiments, the low pressure lubrication circuit supplies the lubrication fluid to a top portion of the crosshead.
In yet another embodiment, the low pressure lubrication outlet supplies the lubrication fluid to a gearbox associated with the reciprocating pump.
In still yet another embodiment, the lubrication pump includes a high pressure lubrication pump that is fluidly coupled to the high pressure lubrication circuit and a separate low pressure lubrication pump that is fluidly coupled to the low pressure lubrication circuit.
In other certain embodiments, the crankshaft drives at least three crossheads where each crosshead is coupled to a respective plunger.
In still another embodiment, the crankshaft drives five crossheads where each cross head is coupled to a respective plunger.
In yet another embodiment, the lubrication pump is a positive displacement-type pump.
In still yet another embodiment, the crosshead moves within a crosshead housing and a bushing is disposed between the crosshead and the crosshead housing.
In yet another embodiment, the lubrication pump is secured to a gearbox associated with the reciprocating pump.
In a second aspect, there is provided a reciprocating pump with a dual circuit lubrication system. The reciprocating pump includes a fluid end that is coupled to a power end and supplies fluid at a high pressure into a wellbore. A high pressure lubrication circuit supplies lubrication fluid to the power end, and a low pressure lubrication circuit supplies lubrication fluid to the power end. A first lubrication pressure of the high pressure lubrication circuit is higher than a second lubrication fluid pressure of the low pressure lubrication circuit.
In an embodiment, the first lubrication fluid pressure is at least one-and-a-half (1.5) the second lubrication fluid pressure.
In yet another embodiment, the low pressure lubrication circuit supplies the lubrication fluid to a top portion of a crosshead, and the high pressure lubrication circuit supplies the lubrication fluid to a bottom portion of the crosshead.
In still another embodiment, the low pressure lubrication circuit supplies the lubrication fluid to a plurality of rolling surfaces associated with rotation of a crankshaft of the power end.
In other certain embodiments, the low pressure lubrication circuit supplies the lubrication fluid to a gearbox.
In yet another embodiment, the high pressure lubrication circuit supplies the lubrication fluid to a pin of a crankshaft.
In still yet another embodiment, the reciprocating pump includes at least one pressure control valve that is configured to maintain the second lubrication fluid pressure in the low pressure lubrication circuit.
In certain embodiments, at least one check valve is disposed within either the high pressure lubrication circuit or the low pressure lubrication circuit. The check valve allows recirculation of the lubrication fluid in the low pressure lubrication circuit while the reciprocating pump is in neutral and recirculation of the lubrication fluid in both the high and the low pressure lubrication fluid circuits simultaneously when the reciprocating pump is pumping.
In a third aspect, there is provided a method for lubricating a power end of a reciprocating pump that includes simultaneously supplying lubrication fluid through a low pressure lubrication circuit and a high pressure lubrication circuit. A first lubrication pressure at of the high pressure lubrication circuit is greater than a second lubrication fluid pressure of the low pressure lubrication circuit.
In one embodiment, the first lubrication fluid pressure is at least 1.5 times the second lubrication fluid pressure.
In certain embodiments, the low pressure lubrication circuit supplies the lubrication fluid to a top portion of a crosshead and the high pressure lubrication circuit supplies the lubrication fluid to a bottom portion of the crosshead.
In other embodiments, the low pressure lubrication circuit supplies the lubrication fluid to a plurality of rolling surfaces associated with rotation of a crankshaft of the power end.
In still other embodiments, the low pressure lubrication circuit supplies the lubrication fluid to a gearbox associated with the power end.
In yet another embodiment, the high pressure lubrication circuit supplies the lubrication fluid to a pin of a crankshaft.
Other aspects, features, and advantages will become apparent from the following detailed description when taken in conjunction with the accompanying drawings, which are a part of this disclosure and which illustrate, by way of example, principles of the inventions hereof.
Embodiments are illustrated by way of example in the accompanying figures, in which like reference numbers indicate similar parts, and in which:
In order to ensure proper lubrication of rolling and sliding surfaces that require higher lubrication fluid pressure, conventional single circuit lubrication systems supply lubrication fluid at an elevated lubrication fluid pressure (also referred to herein as lubrication pressure) whether the particular surface requires elevated lubrication fluid pressure or not. The dual circuit lubrication system 16 uses energy, which can be supplied by a diesel engine, efficiently because less energy (e.g., diesel engine power) is used to supply certain sliding surfaces with high pressure lubrication fluid, and energy (e.g., diesel engine power) is not wasted in supplying elevated lubrication pressure to rolling surfaces that do not require high pressure lubrication fluid.
In operation and as discussed below, a particular surface receives lubrication fluid at a higher pressure or a lower pressure depending on whether it is fluidly coupled to a high pressure lubrication circuit 100 or a low pressure lubrication circuit 102 (
In some embodiments, the lubrication fluid pressure in the high pressure lubrication circuit 100 and at each outlet of the high pressure lubrication circuit 100 where the lubrication fluid is delivered to certain sliding surfaces is about 1.5 times the lubrication fluid pressure of the low pressure lubrication circuit 102. According to one embodiment, the rolling surfaces of the power end are not lubricated by high pressure lubrication circuit 100. The high pressure lubrication circuit 100 is not limited to a lubrication fluid pressure of 1.5 times the lubrication fluid pressure of the low pressure lubrication circuit 102, but may be two times, three times, or four times the lubrication fluid pressure of the low pressure lubrication circuit 102, or more. In some embodiments, the pressure of the high pressure lubrication circuit 100 may be less than 1.5 times the lubrication fluid pressure of the low pressure lubrication circuit 102 provided the difference in the lubrication fluid pressures of the high and low circuits is substantial (e.g., 1.4, 1.3, 1.2 times the lubrication fluid pressure of the low pressure lubrication circuit 102, or less).
In some embodiments, the lubrication fluid pressure of the high pressure lubrication circuit about 100 is 80-120 PSI at approximately 30 gallons per minute (Gpm) flow rate. According to one embodiment, the lubrication fluid pressure in the high pressure lubrication circuit 100 is about 90-100 PSI. The specific sliding surfaces receiving lubrication fluid from the high pressure lubrication circuit 100 are discussed in more detail below.
The actual lubrication fluid pressure will vary slightly across the various outlets of the particular lubrication fluid circuit depending on the operating temperature and the resulting viscosity of the lubrication fluid.
Referring specifically to
With continued reference to
In operation, the reciprocating plunger 28 moves in a plunger bore 34 and is driven by the power end 14 of the reciprocating pump 10. The power end 14 includes a crankshaft 36 that is rotated by a gearbox output 38, illustrated by a single gear but may be more than one gear as described further below. A gearbox input 40 is coupled to a transmission and rotates a gear reduction system that drives the gearbox output 38 at a desired rotational speed to achieve the desired pumping power. A power source, such as a diesel engine (not shown), connects to an input flange 42 (see
As illustrated in
The dual circuit lubrication system 16 (schematically illustrated in
The crankshaft 36 drives the crosshead 44 linearly within the crosshead housing 48. A sliding surface, a bushing 52 in the illustrated embodiment, is disposed between the crosshead 44 and an inner surface of the crosshead housing 48. As discussed in greater detail below, this interface receives both high and low pressure lubrication fluid from the dual circuit lubrication system 16. According to certain embodiments, the bushing 52 may be disposed between the crosshead 44 and the crosshead housing 48 and form the stationary surface on which the crosshead 44 slides within the crosshead housing 48. The bushing 52 may be replaceable and formed of, or coated with, bronze or like material, which reduces friction that would otherwise exist between the crosshead 44 and the crosshead housing 48.
Assuming counter-clockwise rotation of the crankshaft 36 from the perspective of
Such increased lubrication fluid pressure is not needed for lubrication fluid communicated to the top portion 56 of the crosshead 44 and the bushing 52 disposed within the crosshead housing 48, since there is clearance between the crosshead 44 and the crosshead housing 48. In one embodiment, the lubrication fluid pressure is approximately 45-50 PSI. The lubrication fluid from inlet conduit 59 flows over and cools the crosshead 44, and provides lubrication to the components interfacing with and driving the crosshead 44. As such, the low pressure lubrication circuit 102 supplies the top portion 56 of the crosshead 44 through inlet conduit 59.
According to an alternate embodiment, the dual circuit lubrication system 16 accommodates clockwise rotation of the crankshaft 36 from the perspective of
Lubrication fluid circulating through the high pressure lubrication circuit 100 (
According to one embodiment, the knuckle bearing 65 and the wrist pin 46 and their associated sliding surfaces receive sufficient lubrication fluid from the knuckle bearing bore 63, which is part of the low pressure lubrication circuit 102 such that the connecting rod 43 does not have a lubrication conduit running through it. Conventional power end lubrication systems have a lubrication conduit running through the connecting rod that supplies lubrication fluid to the knuckle bearing and the wrist pin from a conduit associated with the crankshaft. By introducing lubrication fluid at the low lubrication fluid pressure through knuckle bearing bore 63 more lubrication fluid is allowed to freely flow to lubricate and cool the sliding surfaces associated with the knuckle bearing 65 and the wrist pin 46. The crank pin and the crank pin bushing receive dedicated lubrication fluid from the high pressure lubrication circuit 100 that doesn't flow through the connecting rod 43 to the wrist pin 46. In addition, a groove and an orifice that fluidly couples the connecting rod in a conventional lubrication system can be eliminated, which leads to increased operating life of the crank pin and crank pin bushing.
Referring now to
The dual circuit lubrication system 16 circulates lubrication fluid or lube oil to the lubrication conduits of the high pressure lubrication circuit 100 at a higher pressure (e.g., 90-135 PSI), and the same lubrication fluid circulates through the lubrication conduits of the low pressure lubrication circuit 102 at a relatively lower pressure (e.g., 45-50 PSI). The lubrication conduits may be made of any suitable material, such as rigid pipe or flexible hoses and may include one or more manifolds through which the lubrication fluid flows.
From the lubrication pump 58, the lubrication fluid flows to an input manifold 64. The input manifold 64 includes a plurality of outlets. One of the outlets fluidly couples the input manifold 64 to a plurality of crosshead bottom conduits 66 (
According to one embodiment, an onboard lubrication fluid filter may be coupled to the power end 14 proximate the input manifold 64. The onboard lubrication fluid filter filters any suitable particulate size from being delivered to the rolling and sliding surfaces of the dual circuit lubrication system 16. For example, an onboard lubrication fluid filter may be a ten micron filter to ensure the dual circuit lubrication system 16 is providing lubrication fluid with only very small particulate to the rolling and sliding surfaces. Purifying the lubrication fluid using an onboard lubrication filter may lead to a longer operating life of components of the reciprocating pump 10.
The lubrication fluid also flows from the lubrication pump through the high pressure lubrication circuit to crankshaft inlets 68a, 68b disposed on each side of the crankshaft 36. The lubrication fluid supplied to the crankshaft inlets 68a, 68b is delivered at a high pressure such that the lubrication fluid can lubricate the sliding surfaces associated with the crankshaft 36, for example journal bearing surfaces (
Lubrication fluid also flows through the lubrication conduit of the low pressure lubrication circuit 102 at a lower pressure to deliver the lubrication fluid to a plurality of rolling surfaces, for example roller bearings 70, associated with the crankshaft 36. The roller bearings 70 are cylindrical rollers that facilitate rotational motion of the crankshaft 36.
The lubrication fluid is also supplied through the low pressure lubrication circuit 102 at a lower pressure to a plurality of crosshead top conduits 74. Each crosshead top conduit 74 is fluidly coupled to deliver lubrication fluid at a low pressure to the top portion 56 of the crosshead 44 through conduit 59 to lubricate and cool the crosshead 44, the knuckle bearing 65, and the wrist pin bearing 67 (
According to the teachings of the present disclosure, the roller bearings 70, the meshing gear interfaces, and the top portion 56 of the crosshead 44 receive low pressure lubrication fluid, and the sliding surfaces associated with the crankshaft 36 and the bottom portion 54 of the crosshead 44 receive high pressure lubrication fluid. The sliding and/or rolling surfaces associated with the knuckle bearing 65 and the wrist pin bearing 67 receive low pressure lubrication fluid.
Reference is now made to
In operation, low pressure lubrication fluid is supplied by the low pressure lubrication pump 77 to a low pressure lubrication conduit 76 in the range of 18-41 gallons per minute, for example, approximately 36.5 gallons per minute. The low pressure pump maintains the lower lubrication pressure of the low pressure lubrication circuit 102. The low pressure lubrication fluid flow splits such that a portion of the low pressure lubrication fluid is delivered to the gearbox 62 and a portion of the low pressure lubrication fluid is delivered to the roller bearing conduits 72 and the crosshead top conduits 74. The lubrication fluid received by the gearbox 62, the roller bearings 70, and the top portion 56 of the crosshead may pass through one or more orifice restrictors 91 to optimize the flow rate of the lubrication fluid to the gearbox 62, the roller bearings 70, and the top portion 56 of the crosshead and balance the temperatures of the lubrication fluid.
The lubrication fluid flows through the roller bearing conduits 72 and is received by the rolling surfaces of the roller bearings 70. The lubrication fluid flows through the crosshead top conduits 74 and is received by the sliding surfaces of the top portion 56 of the crosshead 44.
A bypass conduit 80 ensures that each of the crosshead top conduits 74 and each roller bearing conduit 72 receives lubrication fluid at approximately equal pressure. A second manifold 82 includes a pressure relief valve 73 for the low pressure lubrication circuit 102. Pressure relief valves are employed to allow cold lubrication fluid to be pumped at high pressures that actuate the relief valve until the lubrication fluid heats up and flows through the lubrication circuit at a pressure lower than the actuation pressure of the pressure relief valve. In certain embodiments, the actuation pressure of the pressure relief 73 valve may be approximately ten atmospheres (150 psi).
The lubrication fluid is also pumped by the low pressure lubrication pump 77 and received by the gearbox inlet 84 at a lower lubrication fluid pressure. The gearbox 62 includes any suitable number of gear interfaces where gears mesh to reduce rotational speed and increase torque. In some embodiments, the gearbox 62 includes gears in a planetary configuration. According to one embodiment, the gearbox 62 receives the lubrication fluid at a rate in the range of 10-22 gallons per minute, for example, approximately 20 gallons per minute. An example of meshing gears, which receive lubrication from the lubrication pump, is shown in
According to an embodiment of the present disclosure, each of the roller bearing conduits 72 receive lubrication fluid at a rate in the range of 1-3 gallons per minute, for example, approximately 1.5 gallons per minute, and each of the crosshead top lubrication conduits 74 receive lubrication fluid at a rate in the range of 1-3 gallons per minute, for example approximately 1.5 gallons per minute.
Lubrication fluid is provided by a high pressure lubrication pump 79 to the high pressure lubrication circuit 100 through the high pressure lubrication inlet conduit 78. The high pressure lubrication pump 79 operates in parallel with the low pressure lubrication pump 77. According to an embodiment, the lubrication fluid is provided to the high pressure inlet 78 at a rate in the range of 18-41 gallons per minute, for example approximately 37.5 gallons per minute. The high pressure lubrication pump 79 creates the higher lubrication fluid pressure of the high pressure lubrication circuit 100, as described further below. The high pressure lubrication fluid flows through a manifold, for example the input manifold 64, and is received by the crankshaft 36 such that it flows to each of the five crankshaft pins through a crankshaft pin conduit 75 associated with the crankshaft 36. Each crankshaft pin slides on a steel bushing that may be coated with lead, copper, or tin, or any combination of such materials. These sliding surfaces including the crankshaft pins and bushings are lubricated at high lubrication pressure. The flow rate of the lubrication fluid received by each of the pins of the crankshaft 36 may be in the range of 2-5 gallons per minute, for example approximately 4.3 gallons per minute. Similar to the gearbox 62 of the low pressure lubrication circuit 102, the lubrication fluid received by the crankshaft pin conduits 75 may pass through one or more orifice restrictors 91 to optimize the lubrication fluid flow rate and balance the temperatures of the lubrication fluid. The orifice restrictors 91 balance the flow in the lubrication circuits 100, 102 in order to maintain a substantially constant temperature of the lubrication fluid at the level of optimum lubrication effectiveness. According to one embodiment, the optimum lubrication fluid temperature is approximately 145° F.
The high pressure lubrication fluid also flows to each of the five crosshead bottom lubrication conduits 66 and is supplied to the sliding surfaces of the bottom portion 54 of the crosshead 44. The flow rate of the lubrication fluid received by each of the crosshead bottom conduits 66 may be in the range of 1-4 gallons per minute, for example 3.2 gallons per minute.
Similar to the low pressure lubrication circuit, the high pressure lubrication circuit also includes a manifold 86. According to certain embodiments, the manifold 86 includes a pressure relief valve 83, a lubrication fluid pressure gauge 85, and a temperature gauge 87.
A low pressure control valve that is fluidly coupled to the low pressure lubrication pump 77 maintains the lower lubrication pressure of the low pressure lubrication circuit 102. The low pressure control valve dumps the lubrication to the drain tank if the pressure on the valve exceeds a threshold value. Similarly, a high pressure control valve that is fluidly coupled to the high pressure lubrication pump 79 maintains the higher lubrication pressure of the high pressure lubrication circuit 100. The high pressure control valve allows accumulation of lubrication pressure in the high pressure circuit 100 to exceed the threshold value of the low pressure lubrication circuit 102 due to a higher setting on the high pressure control valve.
For example, the low pressure lubrication pump 77 maintains the lubrication fluid pressure at the outlets of the low pressure lubrication circuit 102 at approximately three atmospheres (45 psi), while the high pressure lubrication pump 79 creates higher lubrication pressure at the outlets of the high pressure lubrication circuit 100, which may, in some embodiments, be at least double that of the outlets of the low pressure lubrication circuit, and in certain embodiments may be triple the lubrication fluid pressure of the outlets of the low pressure lubrication circuit 102.
In an example, the low pressure lubrication circuit 102 operates at a lower pressure than the high pressure circuit 100. An example provides that the high pressure lubrication circuit 102 operates at a higher pressure than the low pressure circuit 102.
In the embodiment schematically illustrated by
According to one embodiment, a check valve 88 is disposed between the high pressure lubrication circuit and the low pressure lubrication circuit. The check valve 88 ensures that, if both the high pressure inlet 78 and the low pressure lubrication conduit 76 are receiving lubrication fluid, flow of the high pressure lubrication fluid is separated from the low pressure lubrication fluid to create the high and low pressure lubrication circuits 100 and 102. However, in certain reciprocating pump operations, such as hydraulic fracturing or fracking, the reciprocating pump 10 may not be pumping, but lubrication fluid may continue to flow through the lubrication system 16 at the low pressure. This is accomplished by delivering lubrication fluid to the lubrication system 16 by the low pressure lubrication conduit 76 and not the high pressure lubrication pump 79. Without the high pressure flow of lubrication acting on check valve 88, the low pressure lubrication flow overcomes the check valve 88 and allows the lubrication fluid at the low pressure to be received by the high pressure circuit 100 of the lubrication system 16. For example, a reciprocating pump 10 may be in neutral when the reciprocating pump 10 is not pumping because other operations are occurring with respect to fracking other than delivering high pressure fluid to the wellbore. With the reciprocating pump 10 in neutral, the high pressure lubrication pump is not being driven because the engine is not driving the gearbox input 40 and thus is not driving the high pressure lubrication pump 79. Nevertheless, the lubrication fluid may be pumped through the entire lubrication system 16 at the lower pressure with the low pressure lubrication pump 77. A second check valve 90 ensures that the fluid flow from the low pressure lubrication conduit 76 does not flow to the high pressure inlet 78 where it may cause damage to the non-operational portion of the high pressure lubrication pump 79.
According to an alternate embodiment, the dual circuit lubrication system 16 shown in
In the foregoing description of certain embodiments, specific terminology has been resorted to for the sake of clarity. However, the disclosure is not intended to be limited to the specific terms so selected, and it is to be understood that each specific term includes other technical equivalents which operate in a similar manner to accomplish a similar technical purpose. Directional terms such as “left” and right”, “front” and “rear”, “above” and “below” and the like are used as words of convenience to provide reference points and are not to be construed as limiting terms.
In this specification, the word “comprising” is to be understood in its “open” sense, that is, in the sense of “including”, and thus not limited to its “closed” sense, that is the sense of “consisting only of”. A corresponding meaning is to be attributed to the corresponding words “comprise”, “comprised” and “comprises” where they appear.
In addition, the foregoing describes only some embodiments of the invention(s), and alterations, modifications, additions and/or changes can be made thereto without departing from the scope and spirit of the disclosed embodiments, the embodiments being illustrative and not restrictive.
Furthermore, invention(s) have described in connection with what are presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not to be limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention(s). Also, the various embodiments described above may be implemented in conjunction with other embodiments, e.g., aspects of one embodiment may be combined with aspects of another embodiment to realize yet other embodiments. Further, each independent feature or component of any given assembly may constitute an additional embodiment.
This application is a continuation application of U.S. patent application Ser. No. 14/808,726, filed on Jul. 24, 2015, now pending, which claims priority to U.S. Provisional Application for Patent No. 62/099,377 filed on Jan. 2, 2015, entitled “Reciprocating Pump with Dual Circuit Power End Lubrication System,” and U.S. Provisional Application for Patent No. 62/095,650 filed on Dec. 22, 2014, entitled “Reciprocating Pump with Dual Circuit Power End Lubrication System,” the disclosures of each of which are incorporated herein by reference.
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Number | Date | Country | |
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20190277279 A1 | Sep 2019 | US |
Number | Date | Country | |
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62099377 | Jan 2015 | US | |
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Number | Date | Country | |
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Parent | 14808726 | Jul 2015 | US |
Child | 16425523 | US |