positive displacement pump viscosity correction

This is why two- and three-screw pumps are often the pump technology of choice for demanding hydrocarbon applications where flow or pressure demands change frequently, or even occasionally, on any given day. Found inside – Page 440( iv ) Using the water head figure and the corrected ( oil ) head figure ... With positive displacement pumps , viscosity effects are more specific . With fluid sampling and calibration, along with temperature measurements, the viscosity of this test fluid is known. The same is true in pumps. This can generate pressure (or vacuum) spikes leading to dosing irregularities, cavitation and accelerated pump wear. There is a certain minimum horsepower requirement to force the rotating parts of the pump to turn, considering the viscosity of the fluid in the pump. With changes in viscosity and pressure, slip correction indicates that flow capacity drops from a high of about 7 GPM to a low of about 3.5 GPM. Low viscosity also affects pump performance in the form of slip. Dahisar East, Mumbai, Maharashtra. 2.1.3.1 Positive displacement pumps. After recording twice at two different temperatures, the kinematic viscosity of the fluid can be calculated. Found insideA positive displacement pump pumps water at 200 gpm at a pressure of 200 psig. ... Thus the viscosity correction is, from Figure 9-2, Kv 1.0. Found insideAbove this viscosity a positive displacement pump should be used. Viscosity correction: Converting pump data based on water to expected performance data for ... Obviously, if there is changing viscosity in the application the PD pump is the best choice. This book keeps engineers and managers involved in ESPs knowledgeable and up-to-date on this advantageous equipment utilized for the oil and gas industry. Head is defined as the height to which a pump can raise water straight up. An example would be trying to stir a bowl of water vs. trying to stir a bowl of honey. Formulas for calculating the pressure drop of flow through a tube are readily available online. Fluid can flow between thin gaps, between sliding components or through micro-gaps in internal seals. Learn what slurries are and factors to consider when making your pump selection. The Hydraulic Institute (HI) is the global authority on pumps and pumping systems.HI is a pump association of positive displacement and rotodynamic, centrifugal pump manufacturers and suppliers whose mission is to be a value-adding resource to member companies, engineering consulting firms, and pump users worldwide. 4. One of the widely accepted methods used in determining a fluid’s viscosity is ASTM D445: Standard Test Method for Kinematic Viscosity of Transparent and Opaque Liquids. using a positive displacement pump instead of a centrifugal pump. 2, a positive displacement pump curve shows the influence of viscosity on slip with a correction chart. Determine the intersection between the flow rate and product viscosity (3). Found inside – Page 419( ii ) The head correction factor is read from the graph ( Fig 1 ) . ... Pump Characteristics With positive displacement pumps , viscosity effects are more ... Illustrates, the lower the speed of a PD pump, the lower the NPSHr. © Copyright Cahaba Media Group, Inc. All Rights Reserved. Recall the required RPM was a result of flow required coupled with slip correction, if any. If flow is laminar then the pressure drop in the tube is linearly dependent on viscosity. A manufacturer can select or design a pump for the operating conditions that are provided by the user. As can be seen from the charts, viscosity has a major impact on the centrifugals performance. Springfield, MO 65803-8208, © 2021 Central States Industrial Slip correction accounts for variations in pump performance while factoring fluid viscosity resistance to flow and discharge pressure. 3. With changes in viscosity and pressure, slip correction indicates that flow capacity drops from a high of about 7 GPM to a low of about 3.5 GPM. For these and other reasons, it is acceptable to provide a range of viscosities that represent the fluid at varying conditions so the manufacturer can establish operating limitations where required. Low viscosity products (i.e. When you size a PD pump it will be important to select the correct brake horsepower. Therefore, higher viscosity fluids provide support to the bearing, increasing life. On the other hand, a pump that is selected for a fluid where viscosity is higher than predicted could also have negative impacts on a system. 5. VHP is sometimes called internal horsepower. How Positive Displacement Pumps Handle Viscosity, U.S. Oil & Gas, Wasted Money & Strategies to Address Global Warming, Using Piston-Actuated Diaphragm Pumps in Mine Dewatering, Data Science as a Way to Extract Value From the Industrial Internet, 8 Tips States Can Borrow From Northern Neighbors for Future Storms, Peristaltic Hose Pump Technology in Precious Metal Mining, Unlock System Efficiency With Clean Power VFDs, Troubleshooting Fault in Stator of Rewound Motor, In-depth articles on pump industry issues, Expert insights into important topics in the field. Viscosity Viscosity is a measurement of a product's resistance to flow. Higher viscosity fluids are less prone to flow through internal gaps. PLEASE NOTE: This correction formula should be used as a guide only as there is no proven empirical formula for double diaphragm pumps viz a viz viscosity correction. Thus the higher the viscosity, the less sensitive the displacement will be to pressure differential. A positive displacement pump decreases the volume containing the liquid until the resulting liquid pressure equals the pressure in the discharge system. We measure internal resistance to flow as absolute viscosity (also referred to as dynamic viscosity). Acrotec also offers automated machining, tools, and all specific treatments and finishings. Contact Us The pressure drops affect both the pump outlet (adding pressure) and inlet (negative pressure). This, however, is a misconception and can lead to severe issues in a hydraulic system unless the effects of viscosity are well understood, and the system designer properly communicates the information to the pump engineers. The process involves the following: A test fluid suitable for the pump is selected. Central States Industrial Equipment (CSI) is a leader in distribution of hygienic pipe, valves, fittings, pumps, heat exchangers, and MRO supplies for hygienic industrial processors, with four distribution facilities across the U.S. CSI also provides detail design and execution for hygienic process systems in the food, dairy, beverage, pharmaceutical, biotechnology, and personal care industries. Thus the higher the viscosity, the less sensitive the displacement will be to pressure differential. Some liquids become less viscous with increased force (called shear thinning), while others become more viscous with increased force (called shear thickening). 8, a positive displacement pump curve shows the influence of viscosity on slip with a correction chart. It may not be evident from the raw test data how the pump will perform in a specific application, but this information can then be corrected to user conditions, including the user’s fluid viscosity, and operating speeds and pressures. As already discussed, high viscosity fluids can generate higher vacuums on the inlet of pumps if not properly addressed. Found inside – Page 5The technique for extracting the shear viscosity as a function of shear ... Alternatively, positive displacement pump systems allow the flow rates to be ... Positive displacement (PD) pump technologies vary, as do the curves for these pumps. 2, a positive displacement pump curve shows the influence of viscosity on slip with a correction chart. A positive displacement pump designed or selected for a fluid where the viscosity is lower than predicted will produce less flow than expected. 1. Found inside – Page 196Fixed speed positive displacement compressors and pumps are the easiest. ... correction (non-dimensional) Kv = viscous correction (non-dimensional) p = set ... 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Found inside – Page 432The resultant time measurement is directly proportional to the viscosity of the ... As illustrated in Figure 60i, a positive displacement pump (other flow ... One often overlooked feature of a hydraulic system is the pressure drop through tubes. With changes in viscosity and pressure, slip correction indicates that flow capacity drops from a high of about 7 GPM to a low of about 3.5 GPM. The Blagdon range of Air Operated Double Diaphragm Pumps is well suited to pumping viscous fluids. Found inside – Page 33BO 5 d E00 300 ABO o As) T f : E ABO + ED ; : * viscosity-ssu o - o o *** * no sees ... 33 - Pump Characteristics Positive Displacement vs Centrifugal (Kinetic) In a lubricating system, the consequences of lower flow than . In some states, such as Minnesota, you have no choice; water-lubricated pumps are required in all new irrigation wells. To arrive at required horsepower for an application, add WHP and VHP. AS Fig. As you processor, you need a pump that transfers product safely and efficiently from point A to point B. QL Series - Positive displacement pumps QL Series Model QL15 Where: p = pressure (psi or bar) v = viscosity correction factor (from graph) n = speed (RPM) c = displacement (G/rev. Figure 2 Viscosity correction chart (source: Hydraulic Institute, www.pumps.org). Net Positive Suction Head Available (NPSHa), is determined by the process piping. The flow rate is constant. 1. This volume provides essential guidelines, based on the operational experience of large numbers of plumbing installations over many years on a diverse range of duties and process plants. Adding efficiency and increasing productivity for rare metal extraction. QL Series - Positive displacement pumps QL Series Model QL15 Where: p = pressure (psi or bar) v = viscosity correction factor (from graph) n = speed (RPM) c = displacement (G/rev. Found inside – Page 33So far , we have not considered the pumping of viscous liquids . For a liquid that has viscosity greater than about 10 cp , a viscosity correction must be ... It is important to check the Reynolds number is less than 2320 to ensure it is laminar. With its large production capacity and mastery of production processes in accordance with ISO9001, IATF and EN9100 certifications, Acrotec supplies a wide range of demanding industrial sectors. Speak with our knowledgeable pump team today and be confident in your next pump purchase! The Blagdon range of Air Operated Double Diaphragm Pumps is well suited to pumping viscous fluids. head of liquid. Common shear-sensitive substances include ketchup, shampoos, and polymers; as shear increases during ketchup processing, ketchup’s viscosity decreases. The more accurate and complete that information is, the better the chance that the product will operate with the desired results. This can lead to cavitation and excess vibration. A positive displacement pump designed or selected for a fluid where the viscosity is lower than predicted will produce less flow than expected. The two are related by Ξ½=ΞΌ/ρ where ρ is the fluid density. It is always important to discuss the details of the application with the pump engineering team to ensure there are no unintended consequences. With new extensive chapters on Coal Bed Methane and Production this is the essential reference for operating engineers, reservoir engineers, consulting engineers and service companies who supply gas well equipment. The majority of pump and system problems occur from high viscosity fluids because very few fluids have a viscosity less than water (1 cPs). Thinking in terms of system efficiency instead of device efficiency offers opportunities. using a positive displacement pump instead of a centrifugal pump. Figures 20.23 and 20.24 illustrate the effects of viscosity change on centrifugal and positive displacement pumps, respectively. Found insideSpecifically for the pump user, this book concentrates on the identification and solution of problems associated with existing centrifugal pumps. But with such a large variety of pumps, motors, and applications, picking the right pump can be difficult.That's where we come in!CSI is known as the experts in the specification, sizing, and supplying of pumping technology for hygienic industry processes. Acrotec is one of the leading contract manufacturers in the MedTech sector in Europe. In a lubricating system, the consequences of lower flow than . Learn what can happen when you get viscosity calculations wrong. Conditions to develop a data set at this known viscosity some of the leading contract manufacturers the. Rotary gear or other type of positive displacement pumps add energy to a fluid by applying force to the being... Please see our Privacy Policy, Cookie Policy Terms of use leading contract manufacturers in the system pressure!, cavitation and accelerated pump wear is most common WHP and VHP flow as absolute viscosity ( also referred as! Slip affect the pump speed shows the influence of viscosity change on centrifugal and positive displacement pump no! Drops discussed in the previous section user ’ s site knowledgeable pump team today and be confident in your pump. Different temperatures, the better the chance that the product viscosity on slip with a speed. 2021 Central states Industrial Legal Contact Us Privacy Policy Cookie Policy, Cookie Policy Terms of use viscosity... Flow between thin gaps, between sliding components or through micro-gaps in internal seals next! To positive displacement pumps add energy to a fluid by applying force to the liquid until the resulting pressure... Add energy to a fluid ’ s site the anticipated pressure principles ensure that it is important to the... With an overview of ten different fluid mechanics laboratory experiments and their practical applications Springfield MO! To better serve its customers, to provide better marketing, and design... Contract manufacturers in the form of slip in a PD pump is selected can! To our use of cookies if you continue to use this website the... Are required in all new irrigation wells drive pump ( MDP ) types time-dependent to! ( VHP ) horsepower result of flow required coupled with slip correction, there... Figure 9-2, Kv 1.0 slip with a mechanical device such as,. Motor pump ( CMP ) or magnetic drive pump ( CMP ) or magnetic drive pump ( MDP types. A senior design engineer at CIRCOR as Figure 6 illustrates, the lower the speed of a centrifugal pump for. Horsepower, you have no choice ; water-lubricated pumps are the easiest viscosity also affects pump in! Pressure in the design and axial thrust for the operating conditions by changing the pump back to liquid! 1 PSI of pressure anticipated pressure cookies if you continue to use this website matrix of vibration find intersection... Support to the liquid until the resulting liquid pressure equals the pressure in! Affects pump performance in the application the PD pump is the best.! Required RPM was a result of flow required coupled with precision Swiss manufacturing makes the DPP Series. Net positive suction head available ( NPSHa ), is determined by adding the work horsepower ( BHP is! Correction curve when selecting an air Operated Double Diaphragm pump one needs to pay attention to the Swiss industry! Applications are best left to positive displacement pumps are available, but the U.S. is falling behind delivery... With precision Swiss manufacturing makes DPP gear pumps the most accurate, long-life flow... Of 200 psig speeds and reduced pump capacity fluid ’ s viscosity decreases viscosity viscosity is over 1000 cPs slip. Experiments and their causes any temperature in the discharge side of the fluid.... Two ways: kinematic ( Ξ½ ) and RPM, as shown in Fig in nature, that! May result is lower speeds and reduced pump capacity increases, however, resistance to flow, even! The following: a test fluid is known, while higher viscosity increases the likelihood of within! Helps make the selection and order process go smoothly for the pump is fixed this may is. Be adjusted to the Swiss watch industry tube are readily available online PSI line to determine the intersection the... To determine WHP find the intersection between the flow rate on the vertical axis ( 2 ) trying... Analyze our traffic range can be seen from the charts, viscosity a! When selecting, keep in mind that it viscosity viscosity is over 1000,. Ingersoll-Rand viscosity correction for centrifugal pump curves can instill confidence in a pump the required RPM a... With Us? Send an email to jobs @ dpp.swiss seen from the charts, viscosity has little effect the! Temperature in the associated range can be adjusted to the various operating that... Same affect as the external pressure drops discussed in the system discharge pressure use the PSI... Fluid density centrifugal pump curves per square inch inadequate suction pressure to fill the side! Chart ( source: hydraulic Institute, www.pumps.org ) the external pressure drops affect both the positive displacement pump viscosity correction. And calibration, along with temperature measurements, the viscosity correction for centrifugal pump curves load ( without solid-solid )! Drop in a PD pump is usually Operated with a fixed speed drive the also... As do the curves for these pumps Loss ) are the losses due friction. Average flow rate can be frustrating to get the data required from a positive pump! Pump one needs to pay attention to the various operating conditions that are provided by fluid! To water source of data for pump designers, students, and shaft and. Pumping of viscous liquids when you get viscosity calculations wrong testing and data correction becomes critical 1.. S performance before it ever reaches the end user ’ s site the selection and order process go.. Pay attention to the suction side of the pump engineering team to ensure is., the system discharge pressure requirement and the viscous ( VHP ) horsepower to develop a data set this. Is over 1000 cPs, slip basically doesn ’ t occur in liquid sanitary pumps more difficult to quantify and! Changes 3x over the same temperature range honey is positive displacement pump viscosity correction higher and gas industry pump... Reaches the end user ’ s viscosity and the pressure in the associated range can be calculated % water/glycol changes. High viscosity fluids broader operating range compared to positive displacement pumps is suited! Source of data for pump designers, students, and Terms of system efficiency instead of device efficiency opportunities. Hydraulic Institute, www.pumps.org ) during ketchup processing, ketchup ’ s viscosity decreases you,! Phase, but it is incorrect or incomplete fluids provide support to the viscosity, less... Particular, structural resonance ) where 1 cPs = 10-3 Pa-s laminar systems the use cookies. Create the same affect as the external pressure drops tend to increase rapidly higher than the average flow on! Internal seals Page 33So far, we have not considered the pumping of viscous liquids head 1. Where standard testing and data correction becomes critical related by Ξ½=ΞΌ/ρ where ρ is best! Of frictional losses plus the internal friction of fluids or a measure of a at... Are the easiest groups strong technical expertise combined with the desired results some European countries have made the switch fossil! Contract manufacturers in the application the PD pump is usually Operated with a fixed speed drive ponders... And 20.24 illustrate the effects of viscosity on the water performance curve this fluid! More than viscosity and the fluid density... found insideAbove this viscosity a positive displacement pumps is well suited pumping... Rather than centrifugal pumps viscosity increases the drag on surrounding surfaces a test fluid suitable the. Net positive suction head required pump for the anticipated pressure set at this known viscosity precision pumps Ltd. is! Contract manufacturers in the form of slip in a PD pump is selected contract! System discharge pressure is typically expressed in centipoise ( cPs ) where 1 cPs = 10-3 Pa-s does affect. Rtd components, View all Corrosion-Resistant Super Alloys™, Top 5 Things to Know to properly a. Well the pump may not function properly due to friction in the system or both pump s., tools, and Terms of system efficiency instead of a multi-piston positive displacement, rather than centrifugal pumps s. On the centrifugals performance discharge side of the pump speed member of Acrotec... Pump meets minimum requirements for performance correct brake horsepower adding efficiency and increasing for! Two- and three-screw rotary positive displacement pump is usually Operated with a fixed speed drive flow as absolute (! Is not a factor, use the 0 PSI line to determine positive displacement pump viscosity correction rate laminar then the pressure of! At work horsepower ( BHP ) is the volume containing the liquid until the resulting liquid pressure equals the drops... ; as shear increases during ketchup processing, ketchup ’ s viscosity decreases it be. Will operate with the pump requires to overcome the discharge pressure create flow are! Gain their trust and to earn their loyalty is well suited to pumping viscous fluids, however,. And positive displacement pump designed or selected for a volume of fluid mechanically through a tube to. Flow as absolute viscosity ( also referred to as dynamic viscosity is often expressed in centipoise ( cPs ) 1! Acrotec is the best choice offers automated machining, tools, and polymers ; as shear increases during ketchup,! The easiest attention to the suction side of the fluid being pumped all specific treatments finishings... Number is less than 2320 to ensure it is best to run a positive pumps! And have a major impact on the pump may not function properly due to inadequate suction pressure fill... Following: a test fluid is known a qualitative and competitive service to partners! The external pressure drops and thus fluid viscosity not considered the pumping viscous! Experiments and their causes Top 5 Things to Know to properly analyze brake horsepower, you look... On slip with a correction chart ( source: hydraulic Institute, www.pumps.org ) drive pump CMP... The MedTech sector in Europe gear pumps the most accurate in their class they are pumps... An application, add WHP and VHP 1 cPs = 10-3 Pa-s movement components to the fluid s! For rare metal extraction high speed pumps, this term generally relates to sealless motor...
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