pump npsh definition

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  • What is NPSH? | Pumps & Systems

    2011-12-17 · The margin of pressure over vapor pressure, at the pump suction nozzle, is Net Positive Suction Head (NPSH). NPSH is the difference between suction pressure (stagnation) and vapor pressure. In equation form: NPSH = Ps ‑ Pvap. Where: NPSH = NPSH available from the system, at the pump inlet, with the pump running.

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  • NPSH, NPSHr & NPSHa Definition | Intro to Pumps

    NPSH is an acronym that stands for Net Positive Suction Head. NPSH is a measure of the absolute pressure present in a liquid. There are two ways of expressing NPSH relative to a centrifugal pumping system: NPSHa: The Net Positive Suction Head Available at the pump impeller inlet.

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  • NPSH for Pumps: Explanation and Effect – What Is Piping

    2021-5-6 · NPSH required by the pump (NPSHr) What is Pump NPSH? The term NPSH is the abbreviation of “net positive suction head” and is an important factor in evaluating the suction characteristics of a centrifugal pump. It allows a prediction to be made regarding the safety margin required to avoid the effects of cavitation during operation.

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  • Pump NPSH - Net Positive Suction Head

    2021-2-26 · Definition : What is pump NPSH. Meaning of NPSH : the term pump NPSH stands for Net Positive Suction Head. It represents the pressure drop in between the suction point of the pump and the minimum pressure that is reached at the pump inlet. If the pump NPSH available is less than the NPSH required, the pump will not work properly.

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  • Net Positive Suction Head definition - NPSH for pumps ...

    2020-1-16 · Net Positive Suction Head (NPSH) NPSH can be defined as two parts: NPSH Available (NPSH A): The absolute pressure at the suction port of the pump. AND . NPSH Required (NPSH R): The minimum pressure required at the suction port of the pump to keep the pump from cavitating. NPSH A is a function of your system and must be calculated, whereas NPSH R is a

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  • Understanding Net Positive Suction Head - Pump School

    2014-9-3 · A net positive suction head (NPSH) for a pump is the difference between the liquid pressure at the pump’s suction and the vapor pressure of the fluid being pumped. It is the amount of energy available to exert pressure on the fluid and is expressed in terms of height of a liquid column i.e. in feet (not in pressure gauge reading).

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  • Net Positive Suction Head definition - NPSH for pumps ...

    NPSH definition. Net Positive Suction Head or NPSH for pumps can be defined as the difference between liquid pressure at pump suction and liquid vapor pressure, expressed in terms of height of liquid column. Suction head is the term used to describe liquid pressure at pump suction in terms of height of liquid column.

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  • What is NPSH (Net Positive Suction Head) and Why Does it ...

    2017-3-13 · The Net Positive Suction Head (NPSH) margin is a crucial factor that is commonly overlooked while selecting a pump. It is the difference between the NPSH available (NPSHa) at the pump’s inlet and the NPSH required (NPSHr) by the pump to operate without cavitation.

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  • NPSH for Rotodynamic Pumps | ScienceDirect

    The concept of the net positive suction head (NPSH) was developed for comparing inlet conditions of the system with the inlet requirements of the pump, in order to predict suction performance. The definition of NPSH takes into account the basic parameters affecting the pump…

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  • Pump Terms and Definitions

    Net Positive Suction Head Required (NPSHR)– NPSHR is the minimum NPSH given by the manufacturer/supplier for a pump achieving a specified performance at the specified capacity, speed, and pumped liquid. Note that occurrence of visible cavitation, increase of noise and vibration due to cavitation, beginning of head or efficiency drop, and ...

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  • NPSH | KSB

    Die Bezeichnung NPSH ist die engl. Abkürzung für 'Net Positive Suction Head' und eine wichtige Größe zur Beurteilung des Saugverhaltens einer Kreiselpumpe. Sie ermöglicht eine Aussage über die Sicherheit gegenüber Auswirkungen der Kavitation während des Betriebes. In der Norm EN 12723 wird der Begriff der 'Haltedruckhöhe' als Synonym für den NPSH-Wert verwendet. Da zu …

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  • Slurry pump NPSH and cavitation-News-China Slurry Pump

    2020-7-7 · The onset of cavitation in a pump, at any given speed and flow rate, is brought about by a particular combination of temperature and pressure at the pump suction flange. The absolute total head is called the Net Positive Suction Head or NPSH. The letter P tells us that NPSH, by definition, can never be a negative number.

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  • What is Centrifugal Pump - Definition

    2019-5-22 · NPSH Available (NPSHa): The absolute pressure at the suction port of the pump. NPSHa is a function of water temperature. As the inlet temperature increases NPSHa decreases, because the saturation pressure decreases. NPSH Required (NPSHR): The minimum pressure required at the suction port of the pump to keep the pump from cavitating. NPSHa is ...

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  • N.P.S.H.A. explained

    2019-2-15 · And we use equation [4] when we are designing a pump system. Let’s try an example. The pump system used in the pump tutorial is a good start. We will use equation [4] to calculate the NPSHA. The value of z which is the suction static head is 15 feet. In the pump tutorial we calculated the friction loss in the suction to be 3.1 feet.

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  • 3.5.2 Begreppet NPSH - PumpPortalen | PumpPortalen

    Begreppet NPSH. Begreppet NPSH förekommer ofta i pumpsammanhang och då i samband med ett annat begrepp, nämligen kavitation. NPSH står för Net Positive Suction Head och kan förklaras i ord med följande definition. NPSH = skillnaden mellan totaltrycket på pumpens sugsida p os och vätskans ångbildningstryck p å mätt i meter vätskepelare.

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  • NPSH - Wikipedia

    2021-4-28 · NPSH, sigla di Net Positive Suction Head, è la prevalenza netta di aspirazione positiva di una pompa, ovvero la differenza tra la pressione in un punto di un generico circuito idraulico e la tensione di vapore del liquido nello stesso punto, e dipende da parametri caratteristici dell'impianto, cioè dalle modalità di installazione della pompa.. L'NPSH normalmente viene indicata in metri di c.a.

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  • NPSH - Net Positive Suction Head

    2021-5-7 · NPSH a = Available Net Positive Suction Head (m, in) Available NPSH a - the Pump is above the Tank. If the pump is positioned above the tank, the elevation - h e-is positive and the NPSH a decreases when the elevation of the pump increases (lifting the pump). At some level the NPSH a will be reduced to zero and the fluid will start to evaporate.

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  • What You Need to Know About NPSH | Vertiflo Pump

    2019-7-9 · Most pump problems are related to net positive suction head (). By Terry Henshaw, Pumps & Systems February 2018 Definition of NPSH The margin of pressure over vapor pressure, at the pump suction nozzle, is net positive suction head (). NPSH is the difference between suction pressure (stagnation) and vapor pressure. In equation form: NPSH = P s – P vap. Where:

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  • NPSH Calculations - EnggCyclopedia

    NPSH Definition. Net Positive Suction Head or NPSH for pumps can be defined as the difference between liquid pressure at pump suction and liquid vapor pressure, expressed in terms of height of liquid column.. Difference between NPSHa and NPSHr. A pump can only accept fluid at suction which above a certain lower limit.

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  • Net Positive Suction Head (NPSH) - Bentley

    2018-12-26 · The NPSHr is a function of pump flow and is usually available as a curve from the pump manufacturer. The user enters this data in a table by clicking Pump Definition on the Home or Components tabs, picking the pump of interest and selecting the NPSH tab.

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  • Rotodynamic Pump NPSH Margin

    Content: NPSH definition, NPSH margin considerations related to inlet tip speed, larger impeller eye, suction specific speed, impeller vane overlap, pump size, construction materials and duty cycle, change in NPSHA with time, rotative speed limitations in water wastewater pumps. Who Should Buy This Standard: OEMs, specifiers, end users and engineering consulting companies that should …

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  • Centrifugal Pump Cross Section Explained - saVRee

    Net positive suction head or NPSH is a means of determining whether a pump can operate normally with low pressure at the pump’s suction eye. Imagine that a pump is connected to a suction tank with a dropping liquid level (Figure 1). The level drops until the liquid just covers the suction pipe and the pump is still operating quite normally (B).

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  • What is Cavitation in Centrifugal Pumps - Definition

    2019-5-22 · Net Positive Suction Head or NPSH for pumps can be defined as the difference between the suction pressure and the saturation pressure of the fluid, expressed in terms of height of liquid column. NPSH is used to measure how close a fluid is to saturated conditions. Lowering the pressure at the suction side can induce cavitation.If cavitation occurs, the violent collapse of the …

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  • Pump FAQs

    The term NPSH3 has was developed to better describe the industry standard for NPSHR. By Hydraulic Institute definition, the required NPSH of a pump is the NPSH available that will cause the total head (first stage head of multistage pumps) to be reduced by 3%. The required NPSH qualified by this criterion will be referred to as NPSH3.

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  • 3.5.2 Begreppet NPSH - PumpPortalen | PumpPortalen

    Begreppet NPSH. Begreppet NPSH förekommer ofta i pumpsammanhang och då i samband med ett annat begrepp, nämligen kavitation. NPSH står för Net Positive Suction Head och kan förklaras i ord med följande definition. NPSH = skillnaden mellan totaltrycket på pumpens sugsida p os och vätskans ångbildningstryck p å mätt i meter vätskepelare.

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  • Predicting NPSHr | Simerics

    2021-2-3 · Derived through analyzing the definition of NPSHr and the characteristics of pump head vs. NPSH curve (i.e. head drop curve), this procedure can significantly reduce the number of simulations needed in NPSHr prediction. For the majority of cases, NPSHr can be predicted with reasonable accuracy for one flow rate in as little as three simulation ...

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  • NPSH | KSB

    The term NPSH is the abbreviation of 'net positive suction head' and is an important factor in evaluating the suction characteristics of a centrifugal pump.It allows a prediction to be made regarding the safety margin required to avoid the effects of cavitation during operation.. In the EN 12723 standard the German term 'Haltedruckhöhe (retaining pressure head)' is used as a synonym for NPSH.

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  • N.P.S.H Definition | Mechanical Equipment Company

    2016-7-22 · N.P.S.H. can also be defined as the combination of atmospheric pressure and static suction head that causes liquid to flow thru the suction piping and finally enter the eye of the impeller. From that it can be seen that N.P.S.H. is very important to successful operation of a pump. 1) N.P.S.H.R — Required by pump at duty point.

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  • Net Positive Suction Head (NPSH) Margin - National Pump ...

    2017-6-13 · NPSHR is a minimum NPSH given by the pump manufacture for the pump to achieve the specified performance. This value may be equal to the NPSH3 of the pump or many contain a margin above the NPSH3 of the pump depending on the manufacture. NPSH3 is the net positive suction head required resulting in a 3% loss of total head at the first stage ...

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  • Understanding Net Positive Suction Head

    2012-6-20 · In pump hydraulics, suction refers to the inward movement of liquid through a conduit, such as a section of pipe, into the pump and ultimately to the eye of the impeller. Suction is the negative pressure induced by the rotating impeller that draws the pumped liquid to a point such that energy may be imparted to it from the impeller vanes.

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  • What is Net Positive Suction Head Required (NPSHR ...

    2014-9-3 · A vacuum pump is used to lower the pressure at the suction tank so as to provide a low head at the pump suction. The pressure in the suction tank is lowered until a drop of 3% is measured. At this point the NPSH is calculated and recorded as the NPSHR for that operating point.

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  • Pumping Systems - Cavitation & Net Positive Suction Head ...

    2018-7-5 · The net positive suction head NPSH for a pump is concept for which no clear consistent definition is available. Consequently the expression cited vary from one text to another. Some sources express NPSH as a pressure head while others as an energy head, hence difference in the handling of the velocity head term. The net […]

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  • NET POSITIVE SUCTION HEAD OF CENTRIFUGAL PUMP -

    2021-5-9 · Net positive suction head required is basically provided by manufacturer of pump. Pump manufacturer will provide the minimum suction condition of a pump in terms of net positive suction head or NPSH. Net positive suction head required will be dependent over the design of pump, speed of the pump and capacity of the pump.

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  • “The Design & Analysis of a Low NPSH Centrifugal Pump ...

    2018-5-6 · NPSH Centrifugal Pump Featuring a Radial Inlet and Axial Inducer Using STAR-CCM+” Edward M Bennett Travis A Jonas Mechanical Solutions 11 Apollo Drive Whippany, NJ 07981 March 19, 2013. 2 AGENDA Introduction and problem definition Design challenges Multiphase CFD analysis Design optimization

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  • Pump Suction Conditions - NPSH - Empowering Pumps and ...

    2011-8-5 · When a pump is taking it‘s suction from a tank, the pump should be located as close to that tank as possible in order to reduce the effect of friction losses on the NPSH available. This is usually accomplished by using a larger diameter line to limit the linear velocity to a level appropriate to the particular liquid being pumped.

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  • What is Pump - Basics, Parts, Types, Details

    2021-4-28 · Pump Definition. Pump is defined as the mechanical equipment which lifts or transfers fluids from a lower elevation region to higher elevation region. Pumps are of various types. These are operating based on various design principles. Working philosophy are different for different pumps. It needs a driver to operate.

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  • Centrifugal Slurry Pump NPSH and Cavitation, Slurry Pump ...

    2018-2-1 · The onset of cavitation in a pump, at any given speed and flow rate, is brought about by a particular combination of temperature and pressure at the pump suction flange. The absolute total head is called the Net Positive Suction Head or NPSH. The letter P tells us that NPSH, by definition, can never be a negative number.

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  • NET POSITIVE SUCTION HEAD OF CENTRIFUGAL PUMP -

    2021-5-9 · Net positive suction head required is basically provided by manufacturer of pump. Pump manufacturer will provide the minimum suction condition of a pump in terms of net positive suction head or NPSH. Net positive suction head required will be dependent over the design of pump, speed of the pump and capacity of the pump.

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  • Pumps – Net Positive Suction Head

    2020-7-24 · NPSH UUg gg §· { ¨¸ ©¹ (11.13) Notes: 1. The first term in NPSH is the head at the suction side of the pump near the impeller inlet. This is the region where we expect to have the lowest head. (Note that we define our reference plane for elevation along the centerline of the pump z = 0.) 2. The second term in NPSH is the vapor pressure head.

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  • Pumps and types, Npsh, centrifugal pump - SlideShare

    2019-7-10 · Pumps and types, Npsh, centrifugal pump 1. Pumps Basic Terms Definition Types Principal of Operation Major components & their Function Terminology -Dhulasi Vinothini K.S 2. What is Pump? Pump: It is a mechanical device used to convert mechanical energy into hydraulic energy in terms of pressure energy, When a fluid has to be 'moved' in a system ...

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  • “The Design & Analysis of a Low NPSH Centrifugal Pump ...

    2018-5-6 · NPSH Centrifugal Pump Featuring a Radial Inlet and Axial Inducer Using STAR-CCM+” Edward M Bennett Travis A Jonas Mechanical Solutions 11 Apollo Drive Whippany, NJ 07981 March 19, 2013. 2 AGENDA Introduction and problem definition Design challenges Multiphase CFD analysis Design optimization

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  • Education Safety - Gorman-Rupp Pumps

    NPSH is the amount of atmospheric pressure at the pump end of the suction system, including the pump. This value can be calculated and is the subject of this bulletin. Once understood, an NPSH calculation is simple and could be time well spent calculating it. We live at the bottom of a …

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  • How to compute Net Positive Suction Head for centrifugal pumps

    2012-5-8 · As indicated previously, a centrifugal pump will always operate at the intersection of its head-capacity curve with the system curve (Figure 1). If insufficient NPSH is supplied to the pump suction this intersection will occur at a lower head and capacity as the pump curve 'breaks-off' and noise and cavitation begins (Figure 2).

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  • Does NPSH required for gear pump for negative pressure at ...

    2014-3-31 · This pump is a gear pump (positive displacement pump), meaning that it will definitely provide a suction force at inlet side if pump is turned on. And I know there is a suction force because when the pump is turned off, no liquid is able to flow out to the discharge side via pump drain line(due to the negative suction pressure in holding tank ...

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  • Definition of NPSH The margin of... - Industrial Pumps ...

    Definition of NPSH. The margin of pressure over vapor pressure, at the pump suction nozzle, is Net Positive Suction Head (NPSH). NPSH is the difference between suction pressure (stagnation) and vapor pressure. In equation form: NPSH = P s ‑ P vap. Where: NPSH = NPSH available from the system, at the pump inlet, with the pump running

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  • Pumpe – Wikipedia

    2021-5-8 · Kolbenpumpe und Plungerpumpe Schöpfwerk & Kolbenpumpe Plungerpumpensatz eines ehem. Wasserwerkes Pumpe einer ehem. Wasserstation Schaltsymbol: Pumpe Schwengelpumpe zum Fördern von Grundwasser Historische Wasserpumpe in Kaster Erdölpipeline: eine von vier Druckpumpen einer Pumpstation Pferdekopfpumpe zur Ölförderung bei Landau …

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  • NPSH (Net positive suction head) - Maintenance engineer

    2020-6-12 · NPSH (net positive suction head) is the difference between suction pressure and lowest pressure inside the pump or system. by the use of the Bernoulli theorem calculated if the suction pressure is greater than vapor pressure then the risk of cavitation is negligible but in other case if the suction head pressure is less than vapor pressure, the formation of bubbles started …

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  • Pump NPSH (Net Positive Suction Head) | Grundfos

    2021-5-13 · The NPSH curve following an NPSH calculation shows H (head) at the Y-axis and Q (flow) at the X-axis. NPSH will cause the lowest pressure inside the pump to decrease below the evaporation pressure of the pumped liquid, if the inlet pressure is too low. Consequentially, cavitation occurs in the pump, causing noise and leading to breakdowns.

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  • Pump Net Positive Suction Head Test (NPSH Test)

    Locate NPSH curve, the NPSH @ 238.5 m³/h is 8 m which is less than 11.09. So the result of the test is OK. This is the way you determine the pump net positive suction head test result and now let be a little bit more in-depth on the subject:

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  • Pumps and types, Npsh, centrifugal pump - SlideShare

    2019-7-10 · Pumps and types, Npsh, centrifugal pump 1. Pumps Basic Terms Definition Types Principal of Operation Major components & their Function Terminology -Dhulasi Vinothini K.S 2. What is Pump? Pump: It is a mechanical device used to convert mechanical energy into hydraulic energy in terms of pressure energy, When a fluid has to be 'moved' in a system ...

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  • NPSH and TDH - Pump engineering - Eng-Tips

    2006-2-27 · Assume that this is a suction lift pump (so that both suction and discharge lifts are +), so it was my assumption that friction and minor losses and the suction lift were used for the NPSH calculation. Then once it was determined that the NPSHr was met, then a sepetate dynamic discharge head is calculated also for static, friction and minor losses.

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  • NASA TECHNICAL NOTE

    2020-8-6 · DEFINITION OF SYMBOLS N Q AH @ N ss NPSH rl pump speed, rpm pump flow rate, gpm pump head rise, ft pump flow coefficient (K, AH pump head coefficient (K2 - ), suction specific speed, NPSH~ net positive suction head at pump inlet NPSH specific suction head, (K3 --F) pump efficiency V 7 . A PERFORMANCE INVESTIGATION OF AN EIGHT-INCH

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  • Pump characteristic curve - PowderProcess.net

    2021-2-22 · Pump characteristics are plotted at constant rpm, but a pump can be run at different speed (either chosen at design, or because a VFD is installed). The effect of the pump speed is the following : at higher rpm, the curve H(Q) will go up, at lower …

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  • Practical Considerations in Pump Suction Arrangements

    2012-5-29 · The single most important function of a pump suction system is to supply an unencumbered, evenly dis-tributed flow to the pump. This is true regardless if the intake configuration is a single pipe, an open sump, or a river. Secondly, the pump suction system should not promote the external introduction, or in-

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  • Pumpe – Wikipedia

    2021-5-8 · Kolbenpumpe und Plungerpumpe Schöpfwerk & Kolbenpumpe Plungerpumpensatz eines ehem. Wasserwerkes Pumpe einer ehem. Wasserstation Schaltsymbol: Pumpe Schwengelpumpe zum Fördern von Grundwasser Historische Wasserpumpe in Kaster Erdölpipeline: eine von vier Druckpumpen einer Pumpstation Pferdekopfpumpe zur Ölförderung bei Landau …

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  • Pump – Wikipedia

    2021-5-8 · En pump är ett verktyg vars syfte är att förflytta en fluid, det vill säga en vätska eller en gas. En värmepump flyttar ett värmemedium i ett slutet kretslopp för att flytta värme från en temperaturnivå till en högre temperaturnivå.

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