Types of positive displacement pumps are reciprocating, metering, and rotary pumps. Click on the links below to download pump model performance curves for rectangular flange universal 2 series positive displacement pumps. These pumps are competent in expanding high pressures while working at little suction forces. Mechanical pumps may be submerged in the fluid they are pumping or be placed external to the fluid pumps can be classified by their method of displacement into positive displacement pumps, impulse pumps, velocity pumps, gravity pumps, steam pumps and valveless pumps. Positive displacement pumps have an expanding cavity on the suction side and a decreasing cavity. In the pump, the mechanical devices which displace the liquid are such as a plunger, pistons, gears, cams, etc. Selecting between centrifugal pumps and positive displacement pumps 1. Understand the difference between centrifugal pumps and positive displacement pumps. Positive displacement pumps features and a positive displace. Ppt pumps powerpoint presentation free to download id.
State the basic principles of positive displacement pumps. How a positive pump operates positive displacement pump operation assuming sufficient nipr positive displacement pumps use two opposing, rotating elements rotors to displace product from the suction side of the pump to the discharge side of the pump. The second type of pump is the positive displacement design, the most common of which is the diaphragm type. Positive displacement pumps use the reciprocating motion of pistons, plungers, or diaphragms to move the liquid through the pump. Types and performance of pumps and compressors essam e. Positivedisplacement pumps operate by forcing a fixed volume of fluid from the inlet pressure section of the pump into the discharge zone of the pump. Pressure relief valves that are usually fitted to the delivery side of the pump to provide safety protection against high pressures also limit maximum pressures possible. Using comprehensive hi standards developed by industry experts from all areas of interest, allows you to make more informed decisions in the design, manufacture and operation of all major pumps positive displacement, and rotodynamic of centrifugal, mixed and axial flow types for greater performance optimization.
Positive displacement pumps are classified into different types but some of them are discussed below like diaphragm, gear, peristaltic, lobe, and piston pumps. Being positive displacement piston units, these pumps can develop very high pressures 10,000 psi and higher for very low or high capacities up to gpm. Displacement pumps can be subclassified as rotary or reciprocating pumps. Positive displacement pumps are generally more tolerant of suction lifts than centrifugal pumps, and all tend to produce pulsating flows to some extent though a progressive cavity pump is better in this respect than a piston pump for example. What is positive displacement pumps types and advantages.
These pumps are commonly called as constant volume pumps. In this chapter, you will be introduced to different types of centrifugal and positive displacement pumps and their various distinguishing external features such as their construction and components. Prevent premature pump failure, pipe breakage, product agitation and system contamination. The volume is a constant given each cycle of operation. A positive displacement pump operating against a closed discharge valve continues to produce flow and the pressure in the discharge line increases until the line bursts, the pump is. Different types of pumps positive displacement pumps. Protect pumps, piping, valves, fittings, meters and inline instrumentation from damaging pulsations, cavitation, thermal expansion, hydraulic shock, surges and water hammer. Prevent destructive pressure surges caused by pump startup and shutdown. Dynamic pumps can be subclassified as centrifugal and special effect pumps. Other languages are translations of the original operating manual. This type of pump delivers a near constant flow rate regardless of the system pressure.
The universal 3 series is the latest addition to the waukesha positive displacement pump family by spx flow. On a test stand the flow rate is determined for various speeds and total head i. Reciprocating pumps are positive displacement piston units driven by a direct connected steam cylinder or by an external power source connected to the crankshaft of the pump piston. Selection of a positive displacement pd rotary pump is not always an easy choice. When a constant flow is required, a positive displacement reciprocating pump is the pump of choice, especially for meteringapplications. Mar 07, 2018 the classification of pumps or the types of water pumps and their working principles. Types and selection of pumps positive displacement pump. Using comprehensive hi standards developed by industry experts from all areas of interest, allows you to make more informed decisions in the design, manufacture and operation of all major pumps positive displacement, and rotodynamic of centrifugal, mixed and axial flow types. Gear pumps are the simplest type of rotary pumps, consisting of two gears laid out sidebyside with their teeth enmeshed. Positive displacement pumps are another category of pumps. When we think of pumping, we ordinarily think of moving water, oil, air, steam, and other common liquids and gases. Positive displacement pumps with positive displacement pumps the flow rate q is linear dependent on the pump speed n.
The books includes all the necessary information selection and application of the all ranges of centrifugal, rotary, positive displacement pumps and boiler feed water pumps. The discharge from reciprocating pumps is in pulses rather than a smooth flow of liquid. A positive displacement pump is one in which a definite volume of liquid is delivered for each cycle of. Pumps come in many forms, but can generally be categorised according to two main operating principles. Types of positive displacement pumps in positive displacement pumps a distinction is made between oscillating and rotary pumps. 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.
Since rotary positive displacement pumps usually have large working chambers that are. All types of positive displacement pumps are often used as main pumps in vacuum systems. A positive displacement pump is one in which a definite volume of liquid is delivered for each cycle of pump. Positivedisplacement pumps operate by forcing a fixed. A positive displacement pump has an expanding cavity on the suction side and a decreasing cavity on the discharge side.
Positive displacement pumps are generally used for specialist applications such as for pumping viscous liquids or liquids that contain suspended or fragile solids. The fluid is positively moved from a set quantity container. They can be classified according to their basic operating principle as dynamic or displacement pumps. This is achieved with the arrangement of expanding cavity at the suction inlet and a decreasing cavity at the outlet. A positive displacement pump must not operate against a closed valve on the discharge side of the pump, because it has no shutoff head like centrifugal pumps.
A positive displacement pump is a machine where chambers fill suction and empty discharge each cycle of operation. Positive displacement pump its definition, types and working. Radial centrifugal pumps axial boat propellers mixed. Positive displacement and special effect types such as venturi eductors are used but. Now, pdps is a form of viking pump which can be further categorised into three. Positive displacement pumps have a very close clearance between rotating and stationary parts and hence are selfpriming. Download instructions for reading positive displacement pump curves pdf. A positive displacement pump makes phil gordon little blue book pdf download a fluid move by trapping a fixed amount. Positive displacement pumps and their different types.
Positive displacement pumps handbook of vacuum technology. This section of pump books has been produced to train pump users technicians and engineers at all levels, these handbooks will provide a great reference tool. The adobe flash plugin is needed to view this content. Classification of pumps based on the method by which mechanical energy is transferred to the fluid. The volume of water thus drawn in the chamber is then shifted or displaced mechanically out of chamber. Positive displacement pumps physically entrap a quantity of liquid at the suction of the pump and push that quantity out the discharge of the pump. It offers a front loading seal design with no bearings in the product zone.
These pumps are typically not capable of such a high flow rate as say, a centifrugal pump, but they are capable of producing much higher pressures. Positive displacement pumps an overview sciencedirect. A positive displacement pump has an expanding cavity on the suction side and an enclosing cavity on the discharging side. Based on direction of fluid flow relative to shaft. Pumps are used to move any substance which flows or which can be made to flow.
Generally, an ebook can be downloaded in five minutes or less. Positive displacement pumps and applications elprocus. Centrifugal pumps develop pressure by increasing the velocity of the liquid liquid is literally flung out of the cutwater. Feb, 2017 in positive displacement booster pumps, either piston or rotors carry out the displacement of fluid through the machine. Positivedisplacement pumps are another category of pumps. This article deals exclusively with centrifugal pumps. Types of positivedisplacement pumps are reciprocating, metering, and rotary pumps. Centrifugal free pdf download download this checklist to keep track of the materials youll need for optimum learning on this topic. The compressor increases the pressure energy of a gas by reducing its volume. Success in water projects depends on the selection of reliable pumps, so do read this. As the rotors rotate, the chamber formed between the rotors, housing and. Positive displacement rotary pumps can be grouped into three main types. The warman pump is both a pressure vessel and a piece of.
Positive displacement pump is also a similar device that transmits water from one place to another. Ppt pumps powerpoint presentation free to download. Positive displacement pumps or pd pumps are one kind of pump and the designing of these pumps can be done long before centrifugal pumps. Positive displacement pumps fkfl series fristam pumpen. Diaphragm pumps also known as aod pumps air operated diaphragms, pneumatic, and aodd pumps. Reciprocatingtype, for example, piston or diaphragm pumps. The fkand flpositive displacement pumps are designed for. Positive displacement pumps an overview sciencedirect topics. The classification of pumps or the types of water pumps and their working principles. Liquid flows into the pumps as the cavity on the suction side expands and the liquid flows out of the discharge as the cavity collapses. Reciprocating pumps an overview sciencedirect topics. In positive displacement booster pumps, either piston or rotors carry out the displacement of fluid through the machine. Positive displacement pumps features and a positive.
Positive displacement pumps operate by forcing a fixed volume of fluid from the inlet pressure section of the pump into the discharge zone of the pump. These pumps generally tend to be larger than equal. Comparing 4 types of pd pumps the printed version of this article appeared as, selecting positive displacement pumps. Types positive displacement pumps a lobe pump a positive displacement pump causes a fluid to move by trapping a fixed amount of it then forcing displacing that trapped volume into the discharge. Centrifugal pumps serve many purposes in residential buildings. Gary dyson is head of product development aftermarket, with union pumpcompany,inbattlecreek,michigan.
This guide will provide you and your manager with a list of resources and overall costs so you can track your progress. What are the different types of positive displacement booster. What are the different types of positive displacement. Most pd pumps can be adapted to handle a wide range of applications, but some types are better suited than.