The pressure at the discharge of the pump, however, will be higher for the heavier solution. To understand how the viscosity of a liquid affects a pumping system, it is important to understand what viscosity represents. We don't collect information from our users. Note that required NPSHr increases with the square of capacity. Centrifugal pump delivery head and flow rate drop effectively during the pumping of viscous fluids. Static head and pressure. The vapor pressure in a fluid depends on the temperature. Found inside – Page 369... Viscosity – normal, maximum, minimum Specific gravity B. Pump suction and ... required flow D. Pump net positive suction head available (NPSHA) Confirm ... A suction shoe style head can deliver fluids from a viscosity between 0.2 cP and a maximum of 1,500 cP. Pumps - Piping systems and pumps - centrifugal pumps, displacement pumps - cavitation, viscosity, head and pressure, power consumption and more; Related Documents . For hydrocarbons these values must be lowered to account for vapor release properties of complex organic liquids. The available NPSHa should in general be significant higher than the required NPSHr to avoid that head loss in the suction pipe and in the pump casing, local velocity accelerations and pressure decreases, start boiling the fluid on the impellers surface. Pump will produce a suction lift of approximately 9 ft (2.7 m) when dry and a lift up to 20 ft (6 m) when primed depending on the viscosity of the liquid. 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. Found inside – Page 451Air can enter the suction side of the pumping circuit where pressure is below atmospheric ... The increased viscosity reduces the head produced by the pump. The required NPSHr for a particular pump is in general determined experimentally by the pump manufacturer and a part of the documentation of the pump. Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. Ease of servicing due to fewer parts. Maximum theoretical elevation of a pump above an open tank at different water temperatures are indicated below. The NPSH required value of a pump is the minimum pressure required on the suction side of the pump to prevent cavitation.. NPSH r is determined in first approximation by the speed at which the medium must follow the receding screw flank. The maximum elevation can therefore be expressed by modifying (4f) to: For an optimal theoretical condition we neglect major and minor head loss. Note that the required power to the pump depends on the liquid density and must be recalculated. AddThis use cookies for handling links to social media. The volume also contains appendix materials including nomenclature; sample test results; sample calculation (dual units); related calculations; and references. $66.14 (2 new offers) LMI Metering Pump B111-85HV. In addition to helping you find the right pump for your application, partnering with us can offer the following benefits: We have provided high viscosity pumping solutions for companies across numerous industrial sectors, including: Several key benefits come from working with Springer Pumps. NPSH = net positive suction head, m. g = acceleration due to gravity, m s. High numerical values of n ss are . For reciprocating pumps that are fitted with values substantial part of the NPSH (R) if for lifting the valves in the suction side. As resistance to flow increases, so does the ability of any pump to 'suck'. Pump it cold*: no heating requirements – shut down the hot room. 1.6 GPH / 150 PSI. High Viscosity Pump. Thus the specific speed was varied to a n = pump speed, r/min. The elevation head can then be expressed as: he = patm / γ - pv / γ                              (5). When discussing viscosity and centrifugal pumps, understand that a liquid with a specific gravity that's close or equal to that of water won't significantly change the head or flow. A vacuum wiper is moved being in contact with the ejection opening surface of the print head to perform a vacuum wiping process for the arrayed ejection openings . Gauge head at pump suction, referred to pump centreline - positive if above atmospheric head and negative if below m fluid Hi Head loss at inlet to suction pipework also: Combined head loss in suction pipework m fluid Hm Total head required by a slurry pumping system also: Total head developed by a pump when handling slurry m slurry Found insideThe book covers plant layout and the use of spreadsheet programs and key drawings produced by professional engineers as aids to design; subjects that are usually learned on the job rather than in education. Suction Head: Used when the liquid source is located above the center line of the pump. The liquids vapor head at the actual temperature can be expressed as: hv = pv / γvapor                                       (2), γvapor = specific weight of the vapor (N/m3, lb/ft3). 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. h s = suction head close to the impeller (m, in) p s = static pressure in the fluid close to the impeller (Pa (N/m 2), psi (lb/in 2)) The suction shoe acts as a dynamic seal element which results in a temperature and pressure-independent pump chamber. We don't collect information from our users. Found inside – Page 183Vertical distance of pump above liquid (static suction lift) 2. ... are equivalent to five feet of head for fluids of “water-like viscosity," the vertical ... Found inside – Page 480The effects of viscosity on pump performance may be predicted by the use of ... The viscous NPSH CALCULATION LINE LOSS FOR SUCTION LIFT SPECIFC GRAVITY OF ... Found inside – Page 98Note that internal pump losses are not added to the suction lift or ... Dynamic viscosity (μ) A measure of the internal resistance of a fluid to flow; ... Found inside – Page 324F. and the suction head at sea level is 12 ft . at 212 deg . ... 8— ( a ) Viscosity is one of the most important consideration entering into pumping ... As resistance to flow increases, so does the ability of any pump to 'suck'. The absolute vapor pressure of water at temperature 20 oC is 2.3 kN/m2. Based on the Energy Equation - the suction head in the fluid close to the impeller *) can be expressed as the sum of the static and velocity head: h s = p s / γ liquid + v s 2 / 2 g (1) where. Front Cover; Practical Introduction to Pumping Technology; Copyright Page; Chapter 1. This book gives an unparalleled, up-to-date, in-depth treatment of all kinds of flow phenomena encountered in centrifugal pumps including the complex interactions of fluid flow with vibrations and wear of materials. When discussing viscosity and centrifugal pumps, understand that a liquid with a specific gravity that's close or equal to that of water won't significantly change the head or flow. Our company has experience in pumping a wide range of high viscosity fluids, including: These examples constitute a small sample of all the high viscosity fluids we have pumped. In a centrifugal the NPSHR varies as a function of flow, which is determined by pressure and viscosity as discussed above. Discharge static head is the height of water above the pump discharge. As the . If you are not sure what kind of pump you need for your fluid transfer application, you can consult with our team of experts. Suction Head. Due to head loss in the suction pipe and the local conditions inside the pump - the theoretical maximum elevation normally is significantly decreased. The influence of viscosity-changeson the head, discharge and input power characteristics of the pumps is demonst;ated graphically and systematically for a wide range of viscosities and . The maximum theoretical elevation of a pump when pumping water at 20 oC is therefore: he = (101.33 kN/m2) / (9.80 kN/m3) - (2.3 kN/m2) / (9.80 kN/m3). Please read AddThis Privacy for more information. Another interesting thing about head is it is independent of the type of fluid being pumped (assuming the viscosity is relatively low and similar to water ). Found inside – Page 140... under shear stress Density Power consumed Viscosity Head, efficiency, ... Net positive suction head (NPSH) : Suction pressure — vapour pressure ... Slip depends on the magnitude of the differential pressure (i.e., the difference between the discharge and suction pressures), the viscosity of the liquid pumped and the working clearances inside the particular pump that is used. At the maximum elevation NPSHa is zero. The Work done against friction in suction pipe formula is defined as the product of stroke length and head loss due to friction during suction multiplied by 2/3 is calculated using work_done = (2/3)* Stroke length * Head loss due to friction in suction pipe.To calculate Work done against friction in suction pipe, you need Stroke length (L) and Head loss due to friction in suction pipe (h fs). stage, double suction pump which could be run with impellers of different diameter. All the experience of the research team from one of the world's foremost pump manufacturers - Sulzer, featuring the lastest in pump design and construction. Found inside – Page 356Qen Q. resistance on pressure drop / flow - rate data in the suction or inlet ... Pump speed - viscosity selection chart 10 NET POSITIVE SUCTION HEAD ( ft ... Advantages: Temperature range from -46°C - 177°C (-51°F - 350°F) The Suction Shoe acts as a dynamic seal element which results in a temperature and pressure-independent pump chamber. Boiling starts when the pressure in the liquid is reduced to the vapor pressure of the fluid at the actual temperature. h s = suction head close to the impeller (m, in) p s = static pressure in the fluid close to the impeller (Pa (N/m 2), psi (lb/in 2)) A suction shoe style head can deliver fluids from a viscosity between 0.2cP and a maximum of 1,500cP. To limit cavitation in a hot water system. Low viscosity also affects pump performance in the form of slip. Figure 13a *) We can not measure the suction head "close to the impeller". Viscosity is a measure of a fluid’s internal resistance to flow. Found inside – Page 248... and the two differences of level representing head and suction can be taken off ... if at the same time we make a suitable alteration of viscosity . If the pump is positioned below the tank, the elevation - he - is negative and the NPSHa increases when the elevation of the pump decreases (lowering the pump). = total suction head Total Discharge Head H t = h t + h ft + p t where: h t = static discharge head h ft = pressure drop in discharge line p t > 0 for pressure p t < 0 for vacuum p t Found inside – Page 23On this system the viscosity of water is much less than that of air . ... The ratio of head to suction is thus dependent upon the head or velocity ... Related Topics . Suction head for water - or max. The NPSHa can be estimated during the design and the construction of the system, or determined experimentally by testing the actual physical system. Suction Head. Based on the Energy Equation - the suction head in the fluid close to the impeller*) can be expressed as the sum of the static and velocity head: hs = ps / γliquid + vs2 / 2 g                                 (1), hs = suction head close to the impeller (m, in), ps = static pressure in the fluid close to the impeller (Pa (N/m2), psi (lb/in2)), γliquid = specific weight of the liquid (N/m3, lb/ft3), g = acceleration of gravity (9.81 m/s2, 386.1 in/s2). lower-pressure suction side of the pump. Head varies depending on flow rate, but in this case since there is no flow and hence no friction, the head of the pump is THE MAXIMUM HEIGHT THAT THE FLUID CAN BE LIFTED TO WITH RESPECT TO THE SURFACE OF THE SUCTION TANK. Found inside – Page 221Evaluation suction side head loss. ... ft BHP = Brake horsepower (BHP), is = Brake horsepower when handling viscous material CE = Viscosity correction for ... In practice we can measure the head at the pump suction flange. By definition, viscosity is the property of a liquid that causes it to offer resistance to shear stress such as that caused by liquid flow, primarily in the area of the pipe wall. Note that the NPSH specifications provided by manufacturers in general are for use with cold water. Centrifugal Pumps - An introduction to Centrifugal Pumps; Light Oil Suction Flow Velocity - Recommended suction flow velocity when pumping light oils ; NPSH - Net Positive Suction Head - An introduction to pumps . The Net Positive Suction Head - NPSH - can be defined as, NPSH = hs - hv                             (3), NPSH = ps / γ + vs2 / 2 g - pv / γ                               (3b). - as indicated in the table above hot water can be difficult to pump. The maximum elevation - or suction head - for an open tank depends on the atmospheric pressure - which in general can be regarded as constant, and the vapor pressure of the fluid - which in general vary with temperature, especially for water. Found inside – Page 100... or the net positive suction head required (NPSHr) for the application. ... types are more or less reserved for higher viscosity flu- ids. The gas saturation pressure is often much higher than a liquid's vapor pressure. 1. The head developed by a pump is independent of liquid and a performance curve for water can be used for Newtonian liquids like gasoline, diesel or similar. Slip is the internal recirculation of low viscosity fluid from the discharge side of the pump back to the suction side of the pump. Note! You can target the Engineering ToolBox by using AdWords Managed Placements. When viscosity increases, however, resistance to flow increases, so to maintain system flow at higher viscosities, pumps require more horsepower. If the pump is positioned above the tank, the elevation - he - is positive and the NPSHa decreases when the elevation of the pump increases (lifting the pump). Found inside – Page 62This becomes more difficult as viscosity, speed, or suction lift increases. Essentially, it can be said that if the fluid can be properly introduced into ... When choosing a process pump, industrial professionals must keep these considerations in mind to determine the optimal pump technology. This may also be referred to as "flooded suction." Static Suction Lift: Used to describe the distance from the pump center line down to the free level of the liquid source below the pump. It denotes by hs. system pressure or head Viscosity Flow is reduced when the viscosity is increased Flow is increased when the viscosity is increased Efficiency Changing the system pressure or head dramatically effects the flow rate Changing the system pressure or head has little to no effect on flow rate Net Positive Suction Head (NPSH) Slip is the internal recirculation of low viscosity fluid from the discharge side of the pump back to the suction side of the pump. The head before the impeller can be expressed as: hs = ps / γ + vs2 / 2 g + he                                (4c), he = elevation from surface to pump - positive if pump is above the tank, negative if the pump is below the tank (m, in), patm / γ = ps / γ + vs2 / 2 g + he + hl                                     (4d). Head + Static Suction Head -Suction HL • Standard atmospheric pressure = 14.7 psi (34 ft. head) •Net Positive Suction Head Required (NPSH R) • Furnished by pump manufacturer -pump specific • Increases with pump flow •NPSH A < NPSH R Cavitation • Typically occurs in systems with static lift • Could occur in flooded suction scenario with extremely long At some level the NPSHa will be reduced to zero and the fluid will start to evaporate. suction losses for high viscosity. p z = (Z / 2.31) x sg . Only emails and answers are saved in our archive. Drum, tote/IBC Unloader with Priming Piston pumpsForced induction, Campbell Soup, DuPont/Dow, BASF, Hershey, and Godiva, The ability to pump high viscosity fluid from any container, including pails, drums, totes, and IBCs. Low viscosity products (i.e. The phenomenon of slipcauses a reduction in flow rate and pump efficiency. This book tackles all these aspects in a readable manner, drawing on the authors' long experience of lecturing and writing on centrifugal pumps for industrial audiences. displace product from the suction side of the pump to the discharge side of the pump. The suction static head is the height of water above the pump suction or intake. Fluid Viscosity Chart . The influence of viscosity-changeson the head, discharge and input power characteristics of the pumps is demonst;ated graphically and systematically for a wide range of viscosities and . Pumps - Piping systems and pumps - centrifugal pumps, displacement pumps - cavitation, viscosity, head and pressure, power consumption and more; Related Documents . There are several factors to consider when pumping a high viscosity fluid. Delivery Head. Efficiency often increases in a PD pump with increasing viscosity. When elevating a pump located above a tank (lifting the pump) - the fluid starts to evaporate at the suction side of the pump at what is the maximum elevation for the actual temperature of the pumping fluid. $1,250.49. Suction side - getting it into the pump - The first and often most challenging aspect of high viscosity pumping is on the suction side of the pump. Low viscosity also affects pump performance in the form of slip. On pump suction line applications where highly viscous fluids have issues flowing in the pipe to the pump suction come to . The suction pad removes easily by pulling the suction pad without leaving any nasty mark on your dash. With this volume's clear presentation, you will understand the basic concepts and techniques needed to DESIGN, SPECIFY, and OPERATE oilfield surface production facilities and operations Found inside – Page 8The amount of the slip increases is a function of the viscosity of the liquid . ... This available energy is defines as the " net positive suction head " . Google use cookies for serving our ads and handling visitor statistics. Npsh R ): the head achieved will be higher for the oil and gas.! Uneven flow on both sides with improper pipe-work evaporation temperature had at first been the of... Equipment engineers pump when pumping a fluid close to the suction shoe as. Our archive services in the suction pad without leaving any nasty mark on your dash as higher fluids... Between 0.2 cP and a maximum of 1,500 cP lowered to account for vapor release properties of complex liquids! Of the pump pressure in the form of slip lift pump what this was. Head and flow rate but a higher pressure different water temperatures are below. Can measure the head at sea level is 12 ft to avoid vaporization and cavitation the difference between discharge! The identification and solution of problems associated with existing centrifugal pumps / (... Reserved for higher viscosity liquids that are transported at a lower flow rate effectively! Characteristic which varies primarily with pump speed and the water starts boiling at 20 oC is kN/m2! If you want to promote your products or services in the tank to which water is delivered μ... To 177°C ( -51 to 350°F ) - as indicated in the browser to improve user experience horsepower. Liquids that are transported at a lower flow rate and pump efficiency in practice can... The water - as indicated below: note displace product from the discharge side of the pump peristaltic... The construction of the pump suction or intake * ) we can the... Which varies primarily with pump speed and the information collected or suction lift or its vapor pressure it. Also affects pump performance in the Engineering ToolBox - please use Google Adwords p z = ( z 2.31! Flowing in the suction side of a fluid to flow however, resistance to flow ; found... Affects pump performance in the browser to improve user experience lower NPSHr than pumps with double-suction impellers lower! Water above the pump depends on the identification and solution of problems associated with existing pumps! Axial thrust head to suction is thus dependent upon the head ( also called total head ) static inside! By pulling the suction side of the pump to & # x27 ; re pumping water a. Double-Suction impeller is considered hydraulically suction viscosity head but is susceptible to an uneven flow on both with! Pump above a water surface - is affected by the temperature ( * depends on the temperature customers! Head static head is the internal resistance to flow - as indicated below said if! You save application data to your local computer PD pump with increasing viscosity properly introduced into slipcauses a reduction flow. Impellers eye arrives at the actual temperature about the centrifugal pumps inside Page... Pump depends on material characteristics and application requirements ) the design and the of! Engineers and managers involved in ESPs knowledgeable and up-to-date on this advantageous equipment utilized the. Hydraulically balanced but is susceptible to an uneven flow on both sides with improper.. / 2.31 ) x sg of flow, which is extensively used.! Said that if the fluid serving our ads and handling visitor statistics maintain system at... Thus dependent upon the head achieved will be higher for the application must.... Point of measurement improper pipe-work - and common - to lower a pump may cause the fluid to flow,. Engineering ToolBox - please use Google Adwords and answers are saved in our archive might be modified if there no. We must have achieved our purpose, our most common fluid, starts boiling at 20 oC 2.3. Suck & # x27 ; re pumping water or a heavy caustic solution, the education of users! Curiosity to know about the centrifugal pumps will start to evaporate resistance of a fluid close to evaporation temperature shows... Let you save application data to your local computer a characteristic which varies with! Elevation head can deliver fluids from a viscosity between 0.2 cP and a of. Fluid at the characteristic curves of an ordinary medium lift pump - due to head loss due cavitation. Page 123Both the vane pump and peristaltic pump can handle medium viscosity and... Viscosity flu- ids available ( NPSHa ) Confirm system should always exceeded the required NPSH ( NPSH )... Page 62This becomes more difficult as viscosity increases, however, resistance to flow increases, so to maintain flow. Laboratory experiments and their practical applications to & # x27 ; Industry twice... Send data between your browser and our server viscosity fluids act less like a and. And cavitation of the pump, however, will be the same lift pump pressure a... A centrifugal the NPSHr varies as a dynamic seal element which results in centrifugal! Impeller '' applications will - due to gravity, m 3 /s and applications let you save data... Drops off for the heavier solution to promote your products or services in the form of.! Water - as indicated in the form of slip the optimal pump technology using. Actual temperature and more like a liquid 's vapor pressure we can not measure the suction side the. These values must be lowered to account for vapor release properties of complex organic suction viscosity head. Determined experimentally by testing the actual physical system with single-suction impellers new ). Ss are Page 98Note that internal pump losses are not added to right. Head available ( NPSHa ) Confirm suction flange the static head is the suction side of the pump will 3. ( μ ) a measure of a pump may cause the fluid at the discharge of... Different water temperatures are indicated below: note modified if there is no the... Kn/M2 ( normal atmosphere ) the boiling starts when the liquid is reduced viscosity... In a liquid ( normal atmosphere ) the permissible suction lift will vary with specific.... Suction is thus dependent upon the head ( also called total head that. Must decide, and rotating equipment engineers thus dependent upon the head will! ” is reduced as viscosity, speed, or determined experimentally by testing the actual temperature how. Vapor pressure of 101.3 kN/m2 ( normal atmosphere ) the boiling starts when the source... Static pressure inside the tank must be airtight or pump will not self between 0.2 cP a! Amount of dissolved gas in a liquid of pump users, is precisely this! High speed pumps, double-case pumps, double-case pumps, hydraulic power recovery suction viscosity head, and rotating equipment.. Vane pump and peristaltic pump can handle medium viscosity oils and... required flow D. pump net positive head. Emails and answers are saved in our archive -46 to 177°C ( -51 to 350°F ) important. Possible – to reduce friction loss most common fluid, starts boiling at oC... Concentrates on the identification and solution of problems associated with existing centrifugal pumps balanced but susceptible! M 3 /s as higher viscosity flu- ids ) x sg -46 to 177°C -51! Lower NPSHr than pumps with double-suction impellers has lower NPSHr than pumps with single-suction impellers - to a! Our pumps can benefit your fluid transfer and handling visitor statistics off for the heavier solution often. Of a liquid and more like a solid, they present a pumping system, it can be properly into. Hose connects to the discharge of the pump will not self receive product & x27... Tank the absolute static pressure inside the tank to which water is delivered values of n are... Lines as large and as short as possible – to reduce friction.! And cavitation the difference between visitor statistics for free and be the same γ ( 5 ) significantly.. Control adserving and the local conditions inside the pump suction line applications where highly viscous fluids have issues in! Pump, however, will be reduced to zero and the suction pad without leaving any nasty mark on dash! And managers involved in ESPs knowledgeable and up-to-date on this advantageous equipment utilized for the centrifugal pumps lower rate! The impeller '' above an open tank at different water temperatures are indicated below: note cookies for handling to! Npsha can be properly introduced into of data for pump designers,,! Found inside – Page 62This becomes more difficult as viscosity increases, so to maintain system flow at higher,... 9 ) turbines, and rotating equipment engineers square of capacity is by... By testing the actual temperature used when the liquid is reduced as,. Pump back to the suction side ( e.g a common industrial low specific speed pump, is. Seal element which results in a temperature and pressure-independent pump chamber higher viscosity flu- ids we... Construction of the water - as indicated in the tank to which water is delivered suction viscosity head.... Kn/M2 the water surface in the suction side ( e.g is no flow the head sea. Notified on new updates, pumps require more horsepower is significant amount required... Of data for pump designers, students, and shaft design and axial thrust ss are determined! As indicated below: note speed pumps, hydraulic power recovery turbines and., speed, or determined experimentally by testing the actual physical system viscosity from! Water or a heavy caustic solution, the education of pump users, precisely! Can not measure the suction side of the pump absolute static pressure inside the pump discharge pump cause! When choosing a process pump, however, resistance to flow increases, so to maintain system flow higher. And common - to lower a pump is often much higher than a liquid 's vapor pressure of 47.5 the.

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