US20130233165A1 - Monitoring system for reciprocating pumps - Google Patents
Monitoring system for reciprocating pumps Download PDFInfo
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- US20130233165A1 US20130233165A1 US13/866,121 US201313866121A US2013233165A1 US 20130233165 A1 US20130233165 A1 US 20130233165A1 US 201313866121 A US201313866121 A US 201313866121A US 2013233165 A1 US2013233165 A1 US 2013233165A1
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- Prior art keywords
- wires
- housing
- fluid
- bundle
- pump
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B25/00—Regulating, controlling, or safety means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B25/00—Regulating, controlling, or safety means
- F01B25/02—Regulating or controlling by varying working-fluid admission or exhaust, e.g. by varying pressure or quantity
- F01B25/04—Sensing elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2201/00—Pump parameters
- F04B2201/08—Cylinder or housing parameters
- F04B2201/0804—Noise
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2203/00—Motor parameters
- F04B2203/02—Motor parameters of rotating electric motors
- F04B2203/0206—Vibration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2205/00—Fluid parameters
- F04B2205/05—Pressure after the pump outlet
Definitions
- the present invention relates generally to reciprocating pumps, more specifically to an apparatus for monitoring operating conditions of the reciprocating pump.
- reciprocating pumps are often used for various purposes.
- Some reciprocating pumps are typically used for operations such cementing, acidizing, or fracing the well.
- these service pumps run for relatively short periods of time but on a frequent basis. Often they are mounted to a truck or a skid for transport to various well sites.
- a pump might operate several times a week. Many times, several pumps will be connected in parallel to a flow line. The operator will know the output pressure of the group of pumps due to a pressure gauge on the flow line, but may not know the individual pump output pressure. The operator will often not know the intake pressure, the individual pump speed, or the extent of vibration of a particular pump. A pump might be performing poorly, yet the operator not know.
- testing service To periodically monitor the performance of the pump, an operator typically calls on the services of testing companies that will set up temporary sensors and monitor the performance of the pump during a test period.
- the testing service connects pressure gauges to the overall intake and discharge, as well as each individual pressure chamber.
- the testing service might also monitor the rotational speed and vibration. Then the testing service removes the test equipment and the pump continues operations without monitoring equipment.
- a reciprocating pump assembly includes a pump housing that houses a crankshaft.
- a plurality of pistons are mechanically connected to the crankshaft for pumping a fluid through a plurality of cylinders or piston chambers.
- Each of the cylinders has a fluid inlet and a fluid outlet.
- the pump also has a monitoring housing connected to the reciprocating pump. Within the monitoring housing is a computer having a memory.
- the pump also has a plurality of pressure sensor assemblies. Each pressure sensor assembly is in electrical communication with the memory. Each pressure sensor assembly is used to sense a pressure value of a fluid within the pump.
- the invention can optionally also include an accelerometer to measure vibrations by sensing displacement.
- the accelerometer is typically positioned adjacent the pump housing.
- the accelerometer is also in electrical communication with the memory of the computer so that the computer can store sensed vibrations or displacements during operations.
- the invention can also have a proximity sensor located within the pump housing to determine the rotational velocity of the crankshaft.
- the proximity sensor is in electrical communication with the memory of the computer so that the computer can store sensed proximity values during operations.
- a pressure sensor assembly that can be used in this invention includes a plug member.
- the plug member is positioned adjacent a sidewall of the pump.
- the sidewall can be selected from various sidewalls that are in fluid communication with the fluid pumped within the reciprocating pump.
- a port is located in the sidewall of the pump that is in fluid communication with the fluid within the pump.
- the plug member has an aperture that registers with the port when the plug member is positioned adjacent the side wall.
- a seal member is positioned between the plug member and the sidewall. The seal member has a passageway that allows the aperture to register with the port when the seal member and the plug member are in place.
- a transducer is located within the plug member and is in fluid communication with the aperture. The transducer converts the pressure into electronic signals that can be communicated to the computer.
- the computer of the pump assembly can also have a port that allows an operator to download the stored sensed values in the memory. This allows an operator to collect the sensed values of the operating conditions over long periods of operation for analysis and monitoring purposes.
- the memory of the computer can be a replaceable memory device such as a chip or disk.
- the computer can include a drive for receiving and ejecting the memory so that the operator can easily retrieve and replace the memory after predetermined periods of operations for analysis.
- FIG. 1 is a schematic elevational view of a reciprocating pump assembly constructed in accordance with this invention.
- FIG. 2 is a top plan schematic view of the reciprocating pump assembly shown in FIG. 1 .
- FIG. 3 is a sectional view of a portion of the pump assembly shown in FIG. 1 .
- FIG. 4 is a perspective view of the reciprocating pump assembly shown in FIG. 1 .
- FIG. 5 is an enlarged sectional view of a monitoring sensor assembly shown in a cover plate of the reciprocating pump assembly shown in FIG. 1 .
- reciprocating pump or pump assembly 12 includes a monitoring assembly 11 is shown attached to a reciprocating pump 12 .
- reciprocating pump 12 includes a crankshaft housing 13 that comprises a majority of the outer surface of reciprocating pump 12 shown in FIGS. 1 and 3 .
- a plunger or piston rod housing 15 attaches to a side of crankshaft housing 13 and extends to a cylinder 17 .
- Each cylinder 17 preferably includes a fluid inlet 19 and a fluid outlet 21 ( FIG. 2 ).
- a cover plate 22 connects to an end of each cylinder 17 opposite from the piston rod housing 15 . While pump 12 is shown in FIG.
- pump 12 can easily be mounted to a trailer that can be towed between operational sites, or to a skid such as for offshore operations.
- a pump assembly is defined as including either a pump 12 mounted directly to the ground or support structure, a skid, or a trailer.
- piston rod housing 15 is segmented into three portions, each portion comprising a plunger or piston throw 23 .
- Reciprocating pump 12 as shown in FIG. 2 has three piston throws 23 , which is commonly know as a triplex, but could also be segmented for five piston throws 23 , which is commonly known as a quintuplex pump.
- the description focuses on a triplex pump, but as will be readily apparent to those skilled in the art, the features and aspects described are easily applicable for a quintuplex or other type of pump.
- Each piston throw 23 houses a piston rod 33 ( FIG. 3 ) extending to cylinder 17 . As shown in FIG. 2 , each piston throw 23 extends in the same longitudinal direction from crankshaft housing 13 .
- crankshaft housing 13 houses a crankshaft 25 , which is typically mechanically connected to a motor (not shown).
- the motor (not shown) rotates crankshaft 25 in order to drive reciprocating pump 12 .
- crankshaft 25 is cammed so that fluid is pumped from each piston throw 23 at alternating times.
- alternating the cycles of pumping fluid from each of cylinders 17 helps minimize the primary, secondary, and tertiary (et al.) forces associated with reciprocating pump 12 .
- a gear 24 is mechanically connected to crankshaft 25 .
- Gear 24 can be for mechanically connecting crankshaft 25 to the motor (not shown), or for conveying rotational energy to another gear for driving another assembly, such as a lubrication pump for lubricating.
- Gear 24 typically has teeth 26 spaced around the circumference of gear 24 .
- a proximity sensor 28 is positioned adjacent crankshaft 25 for calculating the rotational velocity of crankshaft 25 .
- One manner proximity sensor 28 can help calculate rotational velocity is by counting teeth 26 as gear 24 rotates.
- one type of proximity sensor creates a magnetic field within its close proximity. As the each tooth 26 rotates past the proximity sensor 28 , there is a disruption in the magnetic field. These disruptions can be counted and compared to time to help calculate a rotational speed of the gear 24 , which in turn can be used to calculate the rotational speed of crankshaft 25 .
- a connector rod 27 includes an end that connects to crankshaft 25 and another end that engages a crosshead 29 .
- Connector rod 27 connects to crosshead 29 through a crosshead pin 31 , which holds connector rod 27 longitudinally relative to crosshead 29 .
- Connector rod 27 pivots about crosshead pin 31 as crankshaft 25 rotates with the other end of connector rod 27 .
- a piston rod 33 extends from crosshead 29 in a longitudinally opposite direction from crankshaft 25 .
- Connector rod 27 and crosshead 29 convert rotational movement of crankshaft 25 into longitudinal movement of piston rod 33 .
- Cylinder 17 connects to the end of piston rod housing 15 extending away from crankshaft housing 13 ( FIG. 1 ). Cylinder 17 typically includes a cylinder chamber 39 , which is where the fluid being pumped by reciprocating pump 12 is compressed by piston 35 . Cylinder 17 preferably includes an inlet valve 41 and an outlet valve 43 . Valves 41 and 43 are preferably spring-loaded valves, which are actuated by a predetermined differential pressure. Inlet valve 41 actuates to control fluid flow through fluid inlet 19 into cylinder chamber 39 , and outlet valve 43 actuates to control fluid flow through fluid outlet 21 from cylinder chamber 39 .
- Piston 35 reciprocates, or moves longitudinally toward and away from cylinder 17 , as crankshaft 25 rotates.
- the pressure of the fluid inside chamber 39 decreases creating a differential pressure across inlet valve 41 , which actuates valve 41 and allows the fluid to enter cylinder chamber 39 from fluid inlet 19 .
- the fluid being pumped enters cylinder chamber 39 as piston 35 continues to move longitudinally away from cylinder 17 until the pressure difference between the fluid inside chamber 39 and the fluid in fluid inlet 19 is small enough for inlet valve 41 to actuate to its closed position.
- the pressure on the fluid inside of cylinder chamber 39 begins to increase.
- Fluid pressure inside cylinder chamber 39 continues to increase as piston 35 approaches cylinder 17 until the differential pressure across outlet valve 43 is large enough to actuate valve 43 and allow the fluid to exit cylinder 17 through fluid outlet 21 .
- fluid is only pumped across one side of piston 35 , therefore reciprocating pump 12 is a single-acting reciprocating pump. If fluid were also being pumped on the side of piston 35 that connects to piston rod 33 , this would be a double acting pump.
- a pressure sensor assembly monitors the pressure of fluid being pumped by reciprocating pump 12 .
- a pressure sensor assembly Preferably there are a plurality of pressure sensor assemblies advantageously positioned adjacent various sidewalls of pump 12 to sense fluid pressure values at various locations throughout pump 12 .
- each pressure sensor assembly 47 mounted to each discharge flange or well fluid outlet 21 to sense the individual fluid pressure of the fluid exiting each cylinder 17 .
- wires 49 are in electrical communication with pressure sensors 45 , 46 , and 47 .
- each pressure sensor assembly 45 includes a plurality of wires 49 extending therefrom. A preferred structure of each pressure sensor assembly is provided in more detail below.
- wires 49 extending from each pressure sensor assembly 45 combine to form a single bundle or wire harness 51 .
- Wire harness 51 preferably extends below cylinders 17 toward crankshaft housing 13 .
- the end of wire harness 51 extending toward crankshaft housing 13 connects to a wire harness disconnect 53 located on crankshaft housing 13 .
- Wire harness disconnect 53 preferably allows an operator to selectively disengage wire harness 51 while replacing or repairing cylinders 17 .
- a second bundle or wire harness 55 extends from wire harness disconnect 53 toward an upper portion of crankshaft housing 13 .
- a monitoring housing or data collector 57 is located on an upper portion of crankshaft housing 13 .
- Data collector 57 preferably comprises a computer 58 ( FIG. 1 ) that receives and stores data about the operating conditions of pump 12 .
- computer 58 includes memory.
- computer 58 can include a port 60 for downloading data from the memory to another computer.
- computer 58 can optionally include portable memory that is removable and insertable through a drive 62 .
- Such replaceable memory allows an operator to store operating conditions on the memory of computer 58 for a predetermined length of time, and then retrieve the memory with the stored data for analysis and replace the previous memory with a replacement memory for storing data for another predetermined length of time.
- the end of wire harness 55 extending from wire harness disconnect 53 connects to data collector 57 .
- Data collector 57 receives and records the inlet and outlet pressures for each of cylinders 17 associated with reciprocating pump 12 as pistons 35 stroke. As will be appreciated by those skilled in the art, the inlet and outlet pressures from each cylinder 17 can then be transmitted from data collector 57 to a centrally located facility or the measurements can be digitally stored until retrieved by an operator.
- proximity sensor 28 ( FIG. 3 ) is also preferably in electrical communication with the memory of computer 58 so that proximity sensor can transmit the sensed proximities of teeth 26 for storage in the memory of computer 58 .
- Computer 58 computes speed of rotation based on the rate that proximity sensor 28 senses teeth 26 .
- data collector 57 includes memory that receives and stores the information.
- Monitoring inlet and outlet pressures within cylinder chambers 39 allows operators to monitor the efficiency of reciprocating pump 12 as well as the differential pressures associated with inlet and outlet valves 41 , 43 . By monitoring inlet and outlet pressures within cylinder chamber 39 , operators can more effectively determine the appropriate time for replacing inlet and outlet valves 41 , 43 .
- Accelerometer 59 is supported on pump housing 13 and monitors the vibrations of reciprocating pump 12 as crankshaft 25 drives each piston 35 with piston rods 33 .
- accelerometer 59 transmits various voltages responsive to vibrations to data collector 57 for computer 58 to calculate vibrations. Monitoring vibrations associated with reciprocating pump 12 allows operators to detect any abnormal operating conditions of reciprocating pump 12 .
- the chip (not shown) in data collector 57 also receives and stores the information from accelerometer 59 .
- monitoring assembly 11 includes the combined assembly of data collector 57 , accelerometer 59 , proximity sensor 28 , wires and wire harnesses 49 , 51 , 55 , wire harness disconnect 53 , and pressure sensor assemblies 45 , 46 and 47 .
- FIG. 5 shows an example of the preferred embodiment of the pressure sensor assembly 45 .
- pressure sensor assembly 45 is connected to one of cover plates 22 to sense discharge pressure.
- this arrangement is easily suitable for the positioning of pressure sensor assemblies 45 , 46 , 47 on the other various selected sidewalls of pump 12 , like at pump inlet and outlets 19 , 21 .
- Pressure sensor assembly 45 is positioned on the outer surface of cover plate 22 .
- a port 71 extends from an interior surface of cover plate 22 toward the outer surface of cover plate 22 .
- Port 71 is in fluid communication with the fluid pumped by one of the pistons 35 .
- a plug member 73 preferably extends into a portion of cover plate 22 .
- An aperture 75 extending through a portion of plug member 73 registers with port 71 .
- a thread 77 formed on a portion of the outer circumference of plug member 73 that engages a counter-bored thread 79 formed in cover plate 22 for securing plug member 73 to cover plate 22 .
- the counter-bore portion of port 71 defines an outward facing shoulder 80 .
- a metal seal member 81 is sealingly positioned and compressed between an end of plug member 73 and shoulder 80 .
- a passageway 83 extends longitudinally through seal member 81 so that aperture 75 can register with port 71 .
- seal member 81 has a pair of frusto-conical surfaces 85 formed at each longitudinal end for engaging plug member 73 and shoulder 80 .
- the pair of frusto-conical ends 85 form a metal to metal seal with seal member 81 between plug member 73 and shoulder 80 when plug member is installed.
- a transducer 87 is located within plug member in fluid communication with aperture 75 .
- a set of electrical prongs 89 extend from transducer 87 for connection to a plug on each wire 49 .
- Wires 49 ( FIGS. 1-4 ) communicate sensed pressure values electronically to the memory of computer 58 .
- pressure assemblies 45 , 46 , 47 are fixedly positioned adjacent various selected sidewalls of pump 12 .
- Seal member 81 of each pressure sensor assembly 45 provides a seal against leakage of the fluid pumped by pump 12 from exiting through pressure sensor assemblies 45 .
- Wires 49 are connected to pressure sensor assemblies 45 so that wires 49 are in electrical communication with prongs 89 extending from each transducer 87 .
- the fluid communicates with transducer 87 through port 71 , passageway 83 , and aperture 75 .
- Transducer converts the sensed pressure to an electrical signal and communicates the signal to the memory in computer 58 via wires 49 .
- accelerometer 59 and proximity sensor 28 are also communicating their sensed displacement and proximity readings to the memory in computer 58 .
- Computer 58 stores the sensed values from pressure sensor assemblies 45 , 46 , 47 , accelerometer 59 , and proximity sensor 28 in the computer memory.
- the operator can download the sensed values from the memory via a port 60 .
- the operator can alternatively remove the memory with the stored values from computer 58 via drive 62 , and insert a replacement memory for receiving and storing continued sensed operating conditions. This allows continuous monitoring of sensed pressure values of fluid at’ various positions, and at high pressures within reciprocating pump 12 during long periods of operation rather than only during short test runs.
- wires 49 can extend through various sides or ends of cylinders 17 to connect with pressure transducers 45 , 46 , 47 .
- equipment that is mounted to a pump or crankshaft housing e.g. data collector 57
- the monitoring assembly 11 could also easily be used on mud pumps for drilling operations.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Reciprocating Pumps (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
A reciprocating pump assembly includes a pump housing that houses a crankshaft. Pistons are mechanically connected to the crankshaft for pumping fluid through cylinders. Each cylinder has a fluid inlet and a fluid outlet. The pump also has a monitoring housing connected to the reciprocating pump. Within the monitoring housing is a computer with memory. Pressure sensor assemblies sense a pressure value of a fluid within the pump, and are in electrical communication with the memory. An accelerometer positioned on the pump measures vibrations of the pump and is also in electrical communication with the memory for storage of sensed vibrations or displacements during operations. A proximity sensor in electrical communication with the memory is located within the pump housing to determine the rotational velocity of the crankshaft.
Description
- This nonprovisional patent application claims the benefit of co-pending, provisional patent application U.S. Ser. No. 60/465,043, filed on Apr. 24, 2003, which is hereby incorporated by reference in its entirety.
- 1. Field of the Invention
- The present invention relates generally to reciprocating pumps, more specifically to an apparatus for monitoring operating conditions of the reciprocating pump.
- 2. Background of the Invention
- In oil field operations, reciprocating pumps are often used for various purposes. Some reciprocating pumps, generally known as “service pumps,” are typically used for operations such cementing, acidizing, or fracing the well. Typically, these service pumps run for relatively short periods of time but on a frequent basis. Often they are mounted to a truck or a skid for transport to various well sites. A pump might operate several times a week. Many times, several pumps will be connected in parallel to a flow line. The operator will know the output pressure of the group of pumps due to a pressure gauge on the flow line, but may not know the individual pump output pressure. The operator will often not know the intake pressure, the individual pump speed, or the extent of vibration of a particular pump. A pump might be performing poorly, yet the operator not know.
- To periodically monitor the performance of the pump, an operator typically calls on the services of testing companies that will set up temporary sensors and monitor the performance of the pump during a test period. Generally, the testing service connects pressure gauges to the overall intake and discharge, as well as each individual pressure chamber. The testing service might also monitor the rotational speed and vibration. Then the testing service removes the test equipment and the pump continues operations without monitoring equipment.
- Continuous monitoring of the pump through testing companies is not practical. Moreover, during operations, the pressure of the fluid inside of the pump can become quite high which makes it difficult to obtain readings of pressures within the pump at certain locations without leakage. Operators typically will not often use the testing equipment due to the cost associated with the testing companies. An operator may not have a pump tested unless something appears to be wrong with it. Accordingly, operators are often left in the situation of not knowing what the performance conditions of a pump for long periods of time.
- In this invention, a reciprocating pump assembly includes a pump housing that houses a crankshaft. A plurality of pistons are mechanically connected to the crankshaft for pumping a fluid through a plurality of cylinders or piston chambers. Each of the cylinders has a fluid inlet and a fluid outlet. The pump also has a monitoring housing connected to the reciprocating pump. Within the monitoring housing is a computer having a memory. The pump also has a plurality of pressure sensor assemblies. Each pressure sensor assembly is in electrical communication with the memory. Each pressure sensor assembly is used to sense a pressure value of a fluid within the pump.
- The invention can optionally also include an accelerometer to measure vibrations by sensing displacement. The accelerometer is typically positioned adjacent the pump housing. The accelerometer is also in electrical communication with the memory of the computer so that the computer can store sensed vibrations or displacements during operations. The invention can also have a proximity sensor located within the pump housing to determine the rotational velocity of the crankshaft. The proximity sensor is in electrical communication with the memory of the computer so that the computer can store sensed proximity values during operations.
- A pressure sensor assembly that can be used in this invention includes a plug member. The plug member is positioned adjacent a sidewall of the pump. The sidewall can be selected from various sidewalls that are in fluid communication with the fluid pumped within the reciprocating pump. A port is located in the sidewall of the pump that is in fluid communication with the fluid within the pump. The plug member has an aperture that registers with the port when the plug member is positioned adjacent the side wall. A seal member is positioned between the plug member and the sidewall. The seal member has a passageway that allows the aperture to register with the port when the seal member and the plug member are in place. A transducer is located within the plug member and is in fluid communication with the aperture. The transducer converts the pressure into electronic signals that can be communicated to the computer.
- The computer of the pump assembly can also have a port that allows an operator to download the stored sensed values in the memory. This allows an operator to collect the sensed values of the operating conditions over long periods of operation for analysis and monitoring purposes. Alternatively, the memory of the computer can be a replaceable memory device such as a chip or disk. The computer can include a drive for receiving and ejecting the memory so that the operator can easily retrieve and replace the memory after predetermined periods of operations for analysis.
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FIG. 1 is a schematic elevational view of a reciprocating pump assembly constructed in accordance with this invention. -
FIG. 2 is a top plan schematic view of the reciprocating pump assembly shown inFIG. 1 . -
FIG. 3 is a sectional view of a portion of the pump assembly shown inFIG. 1 . -
FIG. 4 is a perspective view of the reciprocating pump assembly shown inFIG. 1 . -
FIG. 5 is an enlarged sectional view of a monitoring sensor assembly shown in a cover plate of the reciprocating pump assembly shown inFIG. 1 . - Referring to
FIGS. 1 and 3 , reciprocating pump orpump assembly 12 includes amonitoring assembly 11 is shown attached to a reciprocatingpump 12. In the preferred embodiment, reciprocatingpump 12 includes acrankshaft housing 13 that comprises a majority of the outer surface of reciprocatingpump 12 shown inFIGS. 1 and 3 . A plunger orpiston rod housing 15 attaches to a side ofcrankshaft housing 13 and extends to acylinder 17. Eachcylinder 17 preferably includes afluid inlet 19 and a fluid outlet 21 (FIG. 2 ). As best shown inFIG. 3 , acover plate 22 connects to an end of eachcylinder 17 opposite from thepiston rod housing 15. Whilepump 12 is shown inFIG. 4 as free-standing on the ground, pump 12 can easily be mounted to a trailer that can be towed between operational sites, or to a skid such as for offshore operations. Accordingly a pump assembly is defined as including either apump 12 mounted directly to the ground or support structure, a skid, or a trailer. - Referring to
FIG. 2 ,piston rod housing 15 is segmented into three portions, each portion comprising a plunger orpiston throw 23. Reciprocatingpump 12 as shown inFIG. 2 has three piston throws 23, which is commonly know as a triplex, but could also be segmented for five piston throws 23, which is commonly known as a quintuplex pump. The description focuses on a triplex pump, but as will be readily apparent to those skilled in the art, the features and aspects described are easily applicable for a quintuplex or other type of pump. Each piston throw 23 houses a piston rod 33 (FIG. 3 ) extending tocylinder 17. As shown inFIG. 2 , eachpiston throw 23 extends in the same longitudinal direction fromcrankshaft housing 13. - Referring to
FIG. 3 , a portion of reciprocatingpump 12 housed withincrankshaft housing 13 is shown.Crankshaft housing 13 houses acrankshaft 25, which is typically mechanically connected to a motor (not shown). The motor (not shown) rotatescrankshaft 25 in order to drive reciprocatingpump 12. In the preferred embodiment,crankshaft 25 is cammed so that fluid is pumped from each piston throw 23 at alternating times. As is readily appreciable by those skilled in the art, alternating the cycles of pumping fluid from each ofcylinders 17 helps minimize the primary, secondary, and tertiary (et al.) forces associated with reciprocatingpump 12. - In the preferred embodiment, a
gear 24 is mechanically connected tocrankshaft 25.Gear 24 can be for mechanically connectingcrankshaft 25 to the motor (not shown), or for conveying rotational energy to another gear for driving another assembly, such as a lubrication pump for lubricating.Gear 24 typically hasteeth 26 spaced around the circumference ofgear 24. In the preferred embodiment, aproximity sensor 28 is positionedadjacent crankshaft 25 for calculating the rotational velocity ofcrankshaft 25. Onemanner proximity sensor 28 can help calculate rotational velocity is by countingteeth 26 asgear 24 rotates. For example, one type of proximity sensor creates a magnetic field within its close proximity. As the eachtooth 26 rotates past theproximity sensor 28, there is a disruption in the magnetic field. These disruptions can be counted and compared to time to help calculate a rotational speed of thegear 24, which in turn can be used to calculate the rotational speed ofcrankshaft 25. - In the preferred embodiment, a
connector rod 27 includes an end that connects to crankshaft 25 and another end that engages a crosshead 29.Connector rod 27 connects to crosshead 29 through acrosshead pin 31, which holdsconnector rod 27 longitudinally relative to crosshead 29.Connector rod 27 pivots aboutcrosshead pin 31 ascrankshaft 25 rotates with the other end ofconnector rod 27. Apiston rod 33 extends from crosshead 29 in a longitudinally opposite direction fromcrankshaft 25.Connector rod 27 and crosshead 29 convert rotational movement ofcrankshaft 25 into longitudinal movement ofpiston rod 33. - A
piston 35 connects topiston rod 33 for pumping the fluid passing through reciprocatingpump 12.Cylinder 17 connects to the end ofpiston rod housing 15 extending away from crankshaft housing 13 (FIG. 1 ).Cylinder 17 typically includes acylinder chamber 39, which is where the fluid being pumped by reciprocatingpump 12 is compressed bypiston 35.Cylinder 17 preferably includes aninlet valve 41 and anoutlet valve 43.Valves Inlet valve 41 actuates to control fluid flow throughfluid inlet 19 intocylinder chamber 39, andoutlet valve 43 actuates to control fluid flow throughfluid outlet 21 fromcylinder chamber 39.Piston 35 reciprocates, or moves longitudinally toward and away fromcylinder 17, ascrankshaft 25 rotates. Aspiston 35 moves longitudinally away fromcylinder chamber 39, the pressure of the fluid insidechamber 39 decreases creating a differential pressure acrossinlet valve 41, which actuatesvalve 41 and allows the fluid to entercylinder chamber 39 fromfluid inlet 19. The fluid being pumped enterscylinder chamber 39 aspiston 35 continues to move longitudinally away fromcylinder 17 until the pressure difference between the fluid insidechamber 39 and the fluid influid inlet 19 is small enough forinlet valve 41 to actuate to its closed position. Aspiston 35 begins to move longitudinally towardscylinder 17, the pressure on the fluid inside ofcylinder chamber 39 begins to increase. Fluid pressure insidecylinder chamber 39 continues to increase aspiston 35 approachescylinder 17 until the differential pressure acrossoutlet valve 43 is large enough to actuatevalve 43 and allow the fluid to exitcylinder 17 throughfluid outlet 21. In the preferred embodiment, fluid is only pumped across one side ofpiston 35, therefore reciprocatingpump 12 is a single-acting reciprocating pump. If fluid were also being pumped on the side ofpiston 35 that connects topiston rod 33, this would be a double acting pump. - In the preferred embodiment, a pressure sensor assembly monitors the pressure of fluid being pumped by reciprocating
pump 12. Preferably there are a plurality of pressure sensor assemblies advantageously positioned adjacent various sidewalls ofpump 12 to sense fluid pressure values at various locations throughoutpump 12. For example, as best shown inFIG. 4 , there is apressure sensor assembly 45 mounted to eachcover plate 22, which allows for sensing the output fluid pressure individually within eachcylinder 17. In the embodiment shown inFIG. 4 , there is also preferably apressure sensor assembly 46 mounted tofluid inlet 19, which feeds into each ofcylinders 17, to sense the overall suction fluid pressure of thefluid entering pump 12. Additionally, there is also preferably apressure sensor assembly 47 mounted to each discharge flange or wellfluid outlet 21 to sense the individual fluid pressure of the fluid exiting eachcylinder 17. In the preferred embodiment,wires 49 are in electrical communication withpressure sensors pressure sensor assembly 45 includes a plurality ofwires 49 extending therefrom. A preferred structure of each pressure sensor assembly is provided in more detail below. - As best illustrated in
FIGS. 2-4 ,wires 49 extending from eachpressure sensor assembly 45 combine to form a single bundle orwire harness 51.Wire harness 51 preferably extends belowcylinders 17 towardcrankshaft housing 13. Referring back toFIG. 2 , the end ofwire harness 51 extending towardcrankshaft housing 13 connects to awire harness disconnect 53 located oncrankshaft housing 13.Wire harness disconnect 53 preferably allows an operator to selectively disengagewire harness 51 while replacing or repairingcylinders 17. A second bundle orwire harness 55 extends fromwire harness disconnect 53 toward an upper portion ofcrankshaft housing 13. - In the preferred embodiment, a monitoring housing or
data collector 57 is located on an upper portion ofcrankshaft housing 13.Data collector 57 preferably comprises a computer 58 (FIG. 1 ) that receives and stores data about the operating conditions ofpump 12. In a manner known in the art,computer 58 includes memory. As shown inFIG. 4 ,computer 58 can include aport 60 for downloading data from the memory to another computer. Additionally,computer 58 can optionally include portable memory that is removable and insertable through adrive 62. Such replaceable memory allows an operator to store operating conditions on the memory ofcomputer 58 for a predetermined length of time, and then retrieve the memory with the stored data for analysis and replace the previous memory with a replacement memory for storing data for another predetermined length of time. - The end of
wire harness 55 extending fromwire harness disconnect 53 connects todata collector 57.Data collector 57 receives and records the inlet and outlet pressures for each ofcylinders 17 associated with reciprocatingpump 12 aspistons 35 stroke. As will be appreciated by those skilled in the art, the inlet and outlet pressures from eachcylinder 17 can then be transmitted fromdata collector 57 to a centrally located facility or the measurements can be digitally stored until retrieved by an operator. Additionally, proximity sensor 28 (FIG. 3 ) is also preferably in electrical communication with the memory ofcomputer 58 so that proximity sensor can transmit the sensed proximities ofteeth 26 for storage in the memory ofcomputer 58.Computer 58 computes speed of rotation based on the rate thatproximity sensor 28senses teeth 26. In the preferred embodiment,data collector 57 includes memory that receives and stores the information. Monitoring inlet and outlet pressures withincylinder chambers 39 allows operators to monitor the efficiency of reciprocatingpump 12 as well as the differential pressures associated with inlet andoutlet valves cylinder chamber 39, operators can more effectively determine the appropriate time for replacing inlet andoutlet valves -
Accelerometer 59 is supported onpump housing 13 and monitors the vibrations of reciprocatingpump 12 ascrankshaft 25 drives eachpiston 35 withpiston rods 33. Typically,accelerometer 59 transmits various voltages responsive to vibrations todata collector 57 forcomputer 58 to calculate vibrations. Monitoring vibrations associated with reciprocatingpump 12 allows operators to detect any abnormal operating conditions of reciprocatingpump 12. In the preferred embodiment, the chip (not shown) indata collector 57 also receives and stores the information fromaccelerometer 59. In the preferred embodiment, monitoringassembly 11 includes the combined assembly ofdata collector 57,accelerometer 59,proximity sensor 28, wires and wire harnesses 49, 51, 55,wire harness disconnect 53, andpressure sensor assemblies -
FIG. 5 shows an example of the preferred embodiment of thepressure sensor assembly 45. In the example shown inFIG. 5 ,pressure sensor assembly 45 is connected to one ofcover plates 22 to sense discharge pressure. As will be readily appreciated by those skilled in the art, this arrangement is easily suitable for the positioning ofpressure sensor assemblies pump 12, like at pump inlet andoutlets -
Pressure sensor assembly 45 is positioned on the outer surface ofcover plate 22. Aport 71 extends from an interior surface ofcover plate 22 toward the outer surface ofcover plate 22.Port 71 is in fluid communication with the fluid pumped by one of thepistons 35. Aplug member 73 preferably extends into a portion ofcover plate 22. Anaperture 75 extending through a portion ofplug member 73 registers withport 71. In the preferred embodiment, athread 77 formed on a portion of the outer circumference ofplug member 73 that engages acounter-bored thread 79 formed incover plate 22 for securingplug member 73 to coverplate 22. The counter-bore portion ofport 71 defines an outward facingshoulder 80. - A
metal seal member 81 is sealingly positioned and compressed between an end ofplug member 73 andshoulder 80. Apassageway 83 extends longitudinally throughseal member 81 so thataperture 75 can register withport 71. In the preferred embodiment,seal member 81 has a pair of frusto-conical surfaces 85 formed at each longitudinal end for engagingplug member 73 andshoulder 80. The pair of frusto-conical ends 85 form a metal to metal seal withseal member 81 betweenplug member 73 andshoulder 80 when plug member is installed. Atransducer 87 is located within plug member in fluid communication withaperture 75. A set ofelectrical prongs 89 extend fromtransducer 87 for connection to a plug on eachwire 49. Wires 49 (FIGS. 1-4 ) communicate sensed pressure values electronically to the memory ofcomputer 58. - In operation,
pressure assemblies pump 12.Seal member 81 of eachpressure sensor assembly 45 provides a seal against leakage of the fluid pumped bypump 12 from exiting throughpressure sensor assemblies 45.Wires 49 are connected to pressuresensor assemblies 45 so thatwires 49 are in electrical communication withprongs 89 extending from eachtransducer 87. During operation ofpump 12, the fluid communicates withtransducer 87 throughport 71,passageway 83, andaperture 75. Transducer converts the sensed pressure to an electrical signal and communicates the signal to the memory incomputer 58 viawires 49. In the preferred embodiment,accelerometer 59 andproximity sensor 28 are also communicating their sensed displacement and proximity readings to the memory incomputer 58. -
Computer 58 stores the sensed values frompressure sensor assemblies accelerometer 59, andproximity sensor 28 in the computer memory. The operator can download the sensed values from the memory via aport 60. In the preferred embodiment, the operator can alternatively remove the memory with the stored values fromcomputer 58 viadrive 62, and insert a replacement memory for receiving and storing continued sensed operating conditions. This allows continuous monitoring of sensed pressure values of fluid at’ various positions, and at high pressures within reciprocatingpump 12 during long periods of operation rather than only during short test runs. - While the invention has been shown in only some of its forms, it should be apparent to those skilled in the art that it is not so limited, but is susceptible to various changes without departing from the scope of the invention. For example,
wires 49 can extend through various sides or ends ofcylinders 17 to connect withpressure transducers assembly 11 could also easily be used on mud pumps for drilling operations.
Claims (9)
1-24. (canceled)
25. A reciprocating pump assembly, comprising:
a pump housing;
a crankshaft housed in the pump housing;
a piston connected to the crankshaft;
a cylinder connected to the pump housing and spaced therefrom in a first direction, the cylinder defining a chamber within which the piston is adapted to reciprocate so that a dynamic pressure within the chamber increases and decreases as the piston reciprocates within the chamber;
an inlet valve to control fluid flow into the chamber;
an outlet valve to control fluid flow out of the chamber;
a fluid inlet in fluid communication with the inlet valve;
a fluid outlet in fluid communication with the outlet valve;
a monitoring housing connected to the pump housing;
an accelerometer connected to the pump housing to sense vibrations of the reciprocating pump assembly;
at least one wire extending between the accelerometer and the monitoring housing;
a proximity sensor to determine a rotational velocity of the crankshaft;
a first pressure sensor assembly mounted to the fluid inlet to sense an overall fluid pressure of the fluid entering the pump, the first pressure sensor assembly comprising:
a first plug member connected to the fluid inlet;
a first transducer located in the first plug member to sense an overall fluid pressure of fluid entering the reciprocating pump assembly;
a first plurality of prongs extending from the first transducer; and
a first plurality of wires extending from the first plurality of prongs, respectively;
a second pressure sensor assembly mounted to the cylinder to sense a dynamic pressure within the chamber, the second pressure assembly comprising:
a second plug member connected to the cylinder;
a second transducer located in the second plug member to sense the dynamic pressure within the chamber;
a second plurality of prongs extending from the second transducer; and
a second plurality of wires extending from the second plurality of prongs, respectively;
a third pressure sensor assembly mounted to the fluid outlet to sense an overall fluid pressure of the fluid exiting the pump, the third pressure assembly comprising:
a third plug member connected to the fluid outlet;
a third transducer located in the third plug member to sense the overall fluid pressure of the fluid exiting the reciprocating pump assembly;
a third plurality of prongs extending from the third transducer; and
a third plurality of wires extending from the third plurality of prongs, respectively;
a computer located within the monitoring housing, the computer comprising a memory, wherein the proximity sensor is in electrical communication with the memory,
wherein the accelerometer is in electrical communication with the memory via at least the at least one wire extending between the accelerometer and the monitoring housing,
wherein the first transducer is in electrical communication with the memory via at least the first plurality of prongs and the first plurality of wires,
wherein the second transducer is in electrical communication with the memory via at least the second plurality of prongs and the second plurality of wires,
wherein the third transducer is in electrical communication with the memory via at least the third plurality of prongs and the third plurality of wires, and
wherein data, which is associated with the vibrations of the reciprocating pump assembly, the rotational velocity of the crankshaft, the overall fluid pressure of the fluid entering the reciprocating pump assembly, the dynamic pressure within the chamber, and the overall fluid pressure of the fluid exiting the reciprocating pump assembly, is adapted to be stored in the memory; and
a wire harness connected to the monitoring housing, the wire harness comprising at least one bundle of at least the following:
the at least one wire extending between the accelerometer and the monitoring housing;
the first plurality of wires extending from the first plurality of prongs, respectively;
the second plurality of wires extending from the first plurality of prongs, respectively; and
the third plurality of wires extending from the first plurality of prongs, respectively;
wherein the monitoring housing is connected to the pump housing, and the wire harness is connected to the monitoring housing, so that the at least one wire, the first plurality of wires, the second plurality of wires, and the third plurality of wires, are all bundled together at a first bundle location adjacent the monitoring housing;
wherein the reciprocating pump assembly has opposing first and second portions spaced in a second direction that is perpendicular to the first direction;
wherein the monitoring housing is connected to the pump housing at the first portion of the reciprocating pump assembly; and
wherein the at least one wire, the first plurality of wires, the second plurality of wires, and the third plurality of wires, are all bundled together in the at least one bundle at a second bundle location that is:
located, in the first direction, between the crankshaft and the cylinder; and
located, in the second direction, at the first portion of the reciprocating pump assembly.
26. The reciprocating pump assembly of claim 25 , further comprising:
a piston rod housing extending, in the first direction, between the pump housing and the cylinder;
wherein the second bundle location is located on the piston rod housing.
27. The reciprocating pump assembly of claim 25 , wherein the second bundle location is located on the pump housing.
28. The reciprocating pump assembly of claim 25 , wherein each of the first, second and third pluralities of wires comprises:
a first set of wires; and
a second set of wires selectively engaged with the first set of wires, respectively.
29. The reciprocating pump assembly of claim 28 , wherein the at least one bundle comprises:
a first bundle, the first bundle comprising the respective first sets of wires of the first, second and third pluralities of wires;
a wire harness disconnect with which the first bundle is selectively engaged; and
a second bundle extending from the wire harness disconnect and to the monitoring housing, the second bundle comprising the respective second sets of wires of the first, second and third pluralities of wires;
wherein the second sets of wires are selectively engaged with the first sets of wires, respectively, via the selective engagement between the first bundle and the wire harness disconnect.
30. The reciprocating pump assembly of claim 29 , wherein the wire harness disconnect permits the first bundle to be selectively disengaged from the wire harness disconnect, and thus selectively disengaged from the second bundle, when at least the cylinder is disconnected from the pump housing.
31. The reciprocating pump assembly of claim 29 , further comprising:
a piston rod housing extending, in the first direction, between the pump housing and the cylinder;
wherein the second bundle location is on the piston rod housing; and
wherein the wire harness disconnect is located at the second bundle location and thus on the piston rod housing.
32. The reciprocating pump assembly of claim 29 , wherein the second bundle location is on the pump housing; and
wherein the wire harness disconnect is located at the second bundle location and thus on the pump housing.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US13/866,121 US20130233165A1 (en) | 2003-04-24 | 2013-04-19 | Monitoring system for reciprocating pumps |
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US46504303P | 2003-04-24 | 2003-04-24 | |
US10/831,467 US20040213677A1 (en) | 2003-04-24 | 2004-04-23 | Monitoring system for reciprocating pumps |
US13/866,121 US20130233165A1 (en) | 2003-04-24 | 2013-04-19 | Monitoring system for reciprocating pumps |
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US10/831,467 Continuation US20040213677A1 (en) | 2003-04-24 | 2004-04-23 | Monitoring system for reciprocating pumps |
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US13/866,121 Abandoned US20130233165A1 (en) | 2003-04-24 | 2013-04-19 | Monitoring system for reciprocating pumps |
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US20040213677A1 (en) | 2004-10-28 |
CA2486126C (en) | 2013-01-08 |
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