Novel piezo motor enables positive displacement microfluidic pump. A regenerative loop hydraulic system is used to reduce the power requirements of the test stand. The progressive cavity pump or positive displacement motor has. The internal components of positive displacement motors. A mud motor or drilling motor is a progressive cavity positive displacement pump pcpd placed in the drill string to provide additional power to the bit while drilling. Guide to reading a positive displacement pump curve. Operate by forcing a fixed volume of fluid from the inlet pressure section of the pump into the discharge zone of the pump. Motors transfer fluid power into mechanical power translational or rotary. A surface pump on the drilling platform or ground moves the drilling mud through the drillstring to the pdm.
A centrifugal pump transfers the kinetic energy of the motor to the liquid by a. Specifically, the hydraulic oscillator and conventional pdm were combined into a pdm with axial impact function. In a centrifugal pump, an impeller rotates to move liquid through the process. Therefore, it can be frustrating to get the data required from a positive displacement curve.
Even now, 150 years later, it remains one of our most successful plans. A novel control system of flexible impact positive. Performance of positive displacement motor pdm operating on. Positive displacement pumps and oilfree compressors for. Guide to reading a positive displacement pump curve pumps. Free undissolved gas fixed or variable mass fraction liquid compressibility ding, h. Oil free positive displacement screw blowers zs 18315 18315 kw 24422 hp zs 18355 vsd 18355 kw 24475 hp proven technology in a leading design low pressure compressed air is the backbone of many production processes. Positivedisplacement motors pdm make use of a power generation. For an ideal iooyoefficient positive displacement motor the rotary speed is. Screw pumps are used for high flows at relatively low pressure and are used on board ships. Test conditions focused on low displacement and low speed regimes. They are especially suitable for applications prone to clogging, since they can produce enough pressure typically up to 1.
Todays positive displacement motors are based on the work of rene moineau, a french. For outdoor installations, motor must be protected by a cover that does not block airflow to and around the motor. Centrifugal and positive displacement pumps pdf free download. Three, small diameter, moineaw positive displacement.
What are positive displacement mud motors in drilling for oil and. The standard covers hydraulically actuated and packed plunger metering pumps. It based on the geometrical fit between the rotating element rotor, and the stationary element stator. Non positive displacement types the two main types in this category are centrifugal and axial in both cases a continuous flow is produced by a rotating impeller. Never should the maximum allowable differential pressure be exceeded. Available in simplex and duplex models, field convertible from simplex to duplex. Pdf design fabrication and analysis of positive displacement. It provides a framework for the manufacturer and purchaser to agree. These components will be explained more explicitly on the following pages. The positive displacement motor pdm has been used in directional. The positive displacement motor consists of a steel shaft rotor that is shaped. Our aims are to 1 emphasize the basic prin ciple involved in the operation. Positive displacement engines driven by liquids f03c crankshafts, crossheads, connectingrods f16c flywheels f16f 1530 gearings for interconverting rotary motion and reciprocating motion in general f16h pistons, pistonrods, cylinders, in general f16j means for thermal insulation in general f16l refrigeration machines, plants or systems f25b.
Hydraulicspneumatics com sites hydraulicspneumatics com files adobe pdf logo. A rotary vane pump is a positive displacement pump that consists of vanes mounted to a rotor that rotates inside a cavity. Oct 07, 2014 positive displacement or mechanical pumps, which provide volumes to be filled with the gas being pumped. In essence, each rotation of the motor shaft causes the pump to move a measured quantity of liquid from its inlet to its outlet. Technical requirements, performance limitations and terminology are presented to assist the person specifying a pd pump. Pdm performance test results and preliminary analysis. What is positive displacement pump definition, types and. Free surfaces of solid region are taken as interactions of the fluid and solid parts. If there were no fluid, the rotor would be free to pivot about socket d in ei. Positive displacement flow meter what it is and how does it. Positive displacement an overview sciencedirect topics. The test stand uses an xpc target data acquisition system. It consist of two archimedes screws that intermesh and are enclosed within the same chamber.
Click get books and find your favorite books in the online library. This video is the best one i found in the internet which explains the internal components of the positive displacement mud motors. Positive displacement motorsequipment and supplies. This unit is not form l4082 1209 shurflo electric motor driven positive displacement pumps. Considering the positive displacement motor from top con nection to bit connection, the main components of the pdm are top sub, catch sub, power section. Performance of positive displacement motor pdm operating. The pd pump range of operating conditions is presented in several. Positive displacement pumps allow liquid to flow into an open cavity trap the liquid in the pump transport liquid from the suction to discharge port mechanically force liquid out of the pump.
Positive displacement supplies a simple and virtually maintenance free approach to accurate chemical feed. The pcpd pump uses drilling fluid commonly referred to as drilling mud, or just mud to create eccentric motion in the power section of the motor which is transferred as concentric power to the drill bit. On vacuum service, with the discharge to atmospheric. Create free account to access unlimited books, fast download and ads free. Api standard 675 for positive displacement pumps pumps. Thus, entropy might increase from heat infiltration. What will happen to the liquid level inside the vessel over time if one pump is moving more liquid. A variabledisplacement motor provides variable torque and variable speed.
A full line of transfer and recirculation pump models are available in 1. Today aerzen twinshaft positive displacement blowers for oil free conveyance show greater innovation than ever before. In contrast, a positive displacement pump moves a set volume of liquid. The performance and efficiency of hydraulic pumps and motors. Pump performance fundamentals of positive displacement. V5 push the handle inwards in order to pass into manual mode. Fabrication of the prototype is also a trouble as rotor and the stator has profiles which are to be manufactured on six axis machine. The nonlinear digital displacement motor model is verified by experimental work.
The positive displacement motor pdm is a typical hydraulic. In most types of positive displacement vacuum pumps the gas is compressed before the discharge at the outlet. Displacement motor pdm, and downhole turbine motor. Look inside positive displacement motor sigma quadrant. The volumes are cyclically isolated from the inlet, and the gas is then transferred to the outlet. Positive displacement vs centrifugal pumps guide when to use. Considering the positive displacement motor from top connection to bit connection, the main components of the pdm are top sub, catch sub, power section, adjustable bend housing abh, and bearing assembly. Add energy directly through a rotating part in the form of velocity.
It is mainly used in directional drilling operations. Hydraulic pumps and actuators pumps classification of pumps, pumping theory of positive displacement pumps, construction and working of gear pumps, vane pumps, piston pumps, fixed and variable. Introduction to problem solving positive displacement pumps. Figure 3 mud motor configuration, rpm, torque relationship. Utilizing blackmers unique sliding vane design, these positive displacement pumps offer the best combined characteristics of sustained highlevel performance, energy efficiency, trouble free operation, and low maintenance cost. Motor selected with extensive experimental data available.
A positive displacement downhole mud motor is a downhole tool which is used during field drilling operations to provide rotational power to drill bits and other downhole tools. Numerical simulation of the dynamic process for positive. Savitribai phule pune university fluids for hydraulic systems, governing laws. Oil free positive displacement screw blowers zs 18315 18315 kw 24422 hp zs 18355 vsd 18355 kw 24475 hp proven. The internal components of positive displacement motors pdm. Understanding a positive displacement pump motor electric. Sep 07, 2017 positive displacement pump pdp is a type of pump in which a moving fluid is captured in a cavity and then discharges that fixed amount of fluid.
Rarely does the actual system curve fall exactly on the one used for design and selection. The resulting rise in pressure, or head, is proportional to the velocity of the liquid. Positive displacement blowers provide a constant volume of air even if the system pressure varies. Liquiflos ftsseries fluid transfer pumps are highperformance continuosly dryrunnable positive displacement pumps built for a variety of industrial applications, capable of transferring a wide range of fluids.
The rotary movement causes the gears to separate, so that the gear spaces are free. Pdf positive displacement machines download full ebooks. This means that there is no heat transfer with the surroundings, and that the process is reversible. They add energy directly to a movable boundary, which imparts the energy to the fluid. Specifying a positive displacement pump without prior training is a difficult task. Agricultural plunger pumps jaeco agripak jaeco fluid. Figure 1 pumps are divided into two categories i non positive displacement types ii positive displacement types 1. The frequent motor replacement during the operation incrementally increases the operating cost despite deriving potential benefits from underbalanced drilling. Also there was some debate originally as to whether or not the positive displacement pump was a constant torque load, on page 19 on the pdf toolbar of the baldor reference the pump is listed as a constant torque load. There are two types of downhole mud motors, namely positive. The rotational motion to a drill bit is provided by the drilling fluid which is pumped into the wellbore with the help of a positive displacement motor that converts.
Aerzens positive displacement blowers, and it is a good thing that it did. Positive displacement pump problems 5 overview of pump problems typically found on positive displacement pumps. In some cases these vanes can have variable length andor be tensioned to maintain contact with the walls as the pump rotates a critical element in vane pump design is how the vanes are pushed into contact with the pump housing, and how the vane tips are machined at this. To solve these problems, this paper designs a flexible impact positive displacement motor pdm control system, and specified the calculation methods for the relevant hydraulic parameters. Positive displacement motor pdm free download as pdf file. Positive displacement pumps features and a positive.
Mud motor is available in a variety of configurations depending on their usage and design. Positive displacement motor pdm the use of mud motors is greatly dependent on financial ef ficiency. Written at a mathematical and technical level, the book explores the most influential research in this field over the past decade, along with industry best practices. Components of positive displacement motors pdms a positive displacement motor is made up of four basic components. Power section failures are typically due to the failure of the stator elastomer. Pdf the power section of a positive displacement drill motor pdm consists of a steel rotor and a tribe with a molded elastomeric lining.
This is brought to you for free and open access by the supervised. Centrifugal and positive displacement pumpspdf free download. A lowcost, uninterrupted, trouble free service for the continuous, accurate metering of chemicals and solutions. The shaft is free at the top but attached to a drive train at the. The pcpd pump uses drilling fluid commonly referred to as drilling mud, or just mud to create eccentric motion in the power section of the motor which is transferred as concentric power to the drill. The displacement of fluid takes place by some parts like plunger, piston, diaphragm etc. Api 675 is a comprehensive standard issued by the american petroleum institute api that is intended to provide a purchase specification covering controlled volume, positive displacement pd pumps for petroleum, chemical and gas industry services. A person without significant exposure to pump selection is often experienced only with centrifugal pump curves. Todays positive displacement motors are based on the work of rene moineau, a french inventor and engineer. Conroe, texas abstract the power section of a positive displacement drill motor pdm consists of a steel rotor and a tube with a molded elastomeric lining stator. Sliding mode curvature drilling rotary mode straight drilling. Jun 04, 2003 it is well known that the performance of positive displacement motor operating on compressible fluid drops down drastically as compared to the operation under incompressible fluids. Positive displacement pumps features and a positive displace.
Advances in cfd simulation of positive displacement machinery. Positive displacement motors theory and applications robello samuel. Selection and integration of positive displacement motors into. In straight vertical holes, the mud motor may be used solely for increased rate of penetration rop, or to minimize erosion and wear on the drill string, since the drill string does not need to be turned as fast.
Positive displacement motor pdm machines mechanical. Positive displacement machines reciprocating compressors isentropic strictly means that the gas doesnt change its entropy. A positive displacement pump delivers a fixed amount of fluid per revolution. Scribd is the worlds largest social reading and publishing site. Theoretical modeling of positive displacement motor performance. A pump and motor test stand is constructed to measure the ef. Positive displacement pumps with positive displacement pumps the flow rate q is linear dependent on the pump speed n.
Polytropic processes allow for some amount of heat to transfer, either in or out, since n is not necessarily equal to k. Modern design innovations and tools explains the design and workings of a wide range of positive displacement pumps, compressors and gas expanders. Analyzed and calculated the performance of the pump, designed a produce. Positive displacement pd pump technologies vary, as do the curves for these pumps. On a test stand the flow rate is determined for various speeds and total head i. Download full positive displacement machines book or read online anytime anywhere, available in pdf, epub and kindle. Pdf stator life of a positive displacement downhole drilling motor.
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