parallel pump discharge pressure

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  • What You Need to Know About Parallel Pump

    2016-3-24 · It is not uncommon for the stronger pump to develop sufficient pressure to close the discharge check valve on the weaker pump, consequently forcing it to operate at a shutoff head (zero flow rate). Figure 3 shows the operation of Pump 1 (Intersection Point 1) and the subsequent parallel operation of Pump 2.

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  • Optimize Parallel Pumping Systems | Pumps & Systems

    2014-5-22 · pump at the system head or discharge pressure. Parallel pumps provide balanced or equal flow rates when the same models are used and their impeller diameters and rotational speeds are identical. When possible, a recommended design practice is to have parallel pumps moved to the left of BEP at the highest flow rate.

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  • Energy Tips – Pumping Systems

    2017-8-10 · While some pump manufacturers that use pressure (differential pressure which is measure the deviation between Suction and Discharge flange ~ HEAD) to characterize their pumps, this is not the most “accurate” way to do so (Because of friction and loss along the pipe line). Head is useful because it evaluates a pump’s capacity to do a job.

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  • Pumps in Parallel or Serial - Engineering ToolBox

    2012-10-16 · Pumps are described as operating in parallel when they receive liquid from the same suction manifold, and discharge into a common discharge manifold. For purposes of this book, we’ll assume that the pumps are located close together, and the suction manifold is well designed so that differences in suction pressure are small enough to ignore.

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  • Parallel Pumps: Reliability & Efficiency Issues |

    2013-7-10 · Having dealt with some astoundly troublesome systems of mis-matched pumps operating in parallel, the most useful characteristics that I found worth primary attention are the suction and discharge temperatures at each pump. The discharge temperature of a pump will be greater when the pump is doing proportionately more spinning than pumping thereby serving to become more of a mechanical water heater than a pump.

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  • Why pumps are used in parallel and series mode of

    17 小时前 · Pump cavitation occurs when the pressure in the pump inlet drops below the vapour pressure of the liquid. Vapour bubbles form at the inlet of the pump and are moved to the discharge of the pump where they collapse and make high sound and vibrations often taking small pieces of the pump with them.

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  • parallel pump problems - Pump engineering - Eng-Tips

    2013-7-10 · 'Discharge cavitation occurs when the pump discharge pressure is extremely high due to output restriction. A restricted discharge that reduces the pump efficiency to a low value (10 – 20%) forces the majority of the fluid to circulate inside the pump instead of being allowed to flow out the discharge.

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  • (PDF) Analysis on Centrifugal Pump Performance in

    Each test takes fluid pressure, discharge, flow type. From the results of this study it was found that the parallel circuit pump with an additional tube bundle produces fluid pressure, discharge ...

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  • Parallel operation | KSB

    Parallel operation, or parallel pumping, of two centrifugal pumps is a mode which allows pump operation to be controlled by starting or stopping one of the two pumps. If two centrifugal pumps I and II are operated in parallel, the flow rate QI+II is the sum of the flow rates of the individual pumps at the same head, i.e.: The actual flow rate and head of pumps operating in parallel …

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  • Understanding pump curves #3: centrifugal pumps in

    2013-4-24 · By Ron Astall, United Pumps Australia Centrifugal pumps are frequently operated in parallel to achieve higher system flows, to enhance system flexibility or to provide greater pump redundancy and hence better system availability. For very large projects, limited availability of sufficiently large pumps or limits on driver size or electrical starting current may dictate the use …

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  • Pumps in Parallel - Pump engineering - Eng-Tips

    2010-4-20 · We have 6 vertical pumps in parallel and there's a discharge gauge on each. We have no individual flowmeters, just a total flow of all 6 pumps from the header. My boss was suggesting to check the power required by the pump and use this value on the power curve to obtain a flow value and then plot this on the performance curve with the pressure ...

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  • GUIDELINES FOR PUMP SYSTEM DESIGNERS Jacques

    2011-8-12 · 3. Use pressure gauges Make sure your pump has a pressure gauge on the discharge side close to the outlet of the pump this will help you diagnose pump system problems. It is also useful to have a pressure gauge on the suction side, the difference in pressure is proportional to the total head. The pressure gauge reading will have to be corrected ...

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  • Pumps in Series Vs Pumps in Parallel - Pharma

    2021-5-12 · while arranging pumps in parallel flow will add i.e q1+q2. But in case of series practically it is not possible .eg. 1 st pump connected with 2nd pump in parallel and 1st pump having head of 50 meter (say water than p=5kg/cm2),this 5kg/cm2 pressure will goes into the the suction side of 2nd pump at 5kg/cm2 and can damage the impeller. Reply Delete

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  • Pump Head vs Discharge Pressure (Easy explanation

    2017-8-10 · The pressure at the discharge of the pump, however, will be higher for the heavier solution. That’s why we would not be able to do simply looking at a pressure gauge and figure out what is pump’s discharge head ability is. Hopefully this post reveal some light on the difference between head and pressure.

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  • Every Pump Operator’s Basic Equation

    2020-12-11 · basic equation every pump operator needs to calculate when operating the fire pump. today, many pump pan-els have flow meters that allow the pump operator to match the readout on the pump panel with the gallon-per-minute (gpm) flow of the selected nozzle. this is a disservice to the integrity of the pump operator. a knowledgeable operator

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  • Series or parallel pump operation – Mc Nally Institute

    The stuffing box of the second pump will see the discharge pressure of the first pump. You may need a high-pressure mechanical seal. Be sure both pumps are filled with liquid during start-up and operation. Start the second pump after the first pump is running. PARALLEL OPERATION. Pumps are operated in parallel when two or more pumps are ...

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  • parallel pump problems - Pump engineering - Eng-Tips

    2013-7-10 · 'Discharge cavitation occurs when the pump discharge pressure is extremely high due to output restriction. A restricted discharge that reduces the pump efficiency to a low value (10 – 20%) forces the majority of the fluid to circulate inside the pump instead of being allowed to flow out the discharge.

    Get Price
  • Why pumps are used in parallel and series mode of

    17 小时前 · Pump cavitation occurs when the pressure in the pump inlet drops below the vapour pressure of the liquid. Vapour bubbles form at the inlet of the pump and are moved to the discharge of the pump where they collapse and make high sound and vibrations often taking small pieces of the pump with them.

    Get Price
  • Series and parallel centrifugal pumps - Bombas

    2021-4-11 · Regarding the flow, the arrangement in parallel each pump brings its value to the equivalent while in series the flow is common to both pumps. The resulting elevation height of the parallel array retains the operating range of the associated pumps, while in series the lift height increases as it passes through the next pump.

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  • Parallel or Series pump operation for selecting a

    Parallel or Series pump operation (parallel operation) When pumps operate in parallel, clearly specify “Auto Start required” Pumps that have stable head/flowrate curves (continuous head rise to shutoff) are preferred for all applications and are required if parallel operation is specified. If parallel operation is specified, the head rise ...

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  • Parallel pumps operation - Pump engineering - Eng-Tips

    2012-7-2 · In general, steeper pump curves are recommended for parallel pump operation. I am not sure that there is much benefit to adding an orifice plate. Adding an orifice will work to shift the pump operating point leftward. Even if you add an orifice plate, the pump discharge pressure still seems to be inadequate to compete with the other pump.

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  • Parallel operation | KSB

    Parallel operation, or parallel pumping, of two centrifugal pumps is a mode which allows pump operation to be controlled by starting or stopping one of the two pumps. If two centrifugal pumps I and II are operated in parallel, the flow rate QI+II is the sum of the flow rates of the individual pumps at the same head, i.e.: The actual flow rate and head of pumps operating in parallel (operating ...

    Get Price
  • (PDF) Analysis on Centrifugal Pump Performance in

    Each test takes fluid pressure, discharge, flow type. From the results of this study it was found that the parallel circuit pump with an additional tube bundle produces fluid pressure, discharge ...

    Get Price
  • Pumps - ScienceDirect

    2014-1-1 · Differential pressure (Ptd)—The difference between the liquid discharge pressure and suction pressure. Net positive suction head required (NPSHR) —The amount of suction pressure, over vapor pressure, required by the pump to obtain satisfactory volumetric …

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  • Thinking positive: the characteristics of positive ...

    2017-12-15 · The actual operating pressure is the pressure imposed on the pump discharge by the combination of static and dynamic (mainly pipe friction) head. If a positive displacement pump is operated against a closed discharge valve, the pressure attained will only be limited by the driver, the strength of the materials composing the pump and piping, or ...

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  • Efficiency of pumps in parallel operation on long ...

    2018-5-29 · of water is usually done by multiple, constant speed, high pressure, multi-stage, centrifugal pumps operating in parallel. Such pumps operate from a common suction line and discharge into a common manifold. As a result intake and discharge pressures as well as the flow rates are correlated, which complicates the

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  • Troubleshooting Pumps in a System | Pumps & Systems

    2016-1-12 · Low Discharge Pressure. In this example, we investigate the possible causes of low discharge pressure in the same pumping system, and through the process of elimination we will narrow in on the probable cause. The system represented in Figure 1 has two identical pumps in parallel. One pump is operating and the other is on standby.

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  • Parallel or Series pump operation for selecting a

    Parallel or Series pump operation (parallel operation) When pumps operate in parallel, clearly specify “Auto Start required” Pumps that have stable head/flowrate curves (continuous head rise to shutoff) are preferred for all applications and are required if parallel operation is specified. If parallel operation is specified, the head rise ...

    Get Price
  • Plant Engineering | Advantages of parallel pumping

    1999-7-1 · Pressure fluctuations, pump curve type, unequal capacity splits, and minimum pressure requirements must be evaluated and considered to select the most effective combination. Final considerations. It is common to require a dedicated standby pump for a main heating or process loop. It is usually a duplicate of the main pump.

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  • Sudden Drop of Pump Discharge Pressure - CR4

    2011-3-13 · 1. Pump B had run well 2 months ago in 7 days, then stopped for minor maintenance of electric motor. After the motor installed, we started it again and then the discharge pressure of Pump B went down. We didn't do anything with the pump. I think the direction was correct since we didn't move the pump and the motor turned on the right direction.

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  • A Case Study of Vibration in Positive Displacement Pump ...

    2019-11-25 · operation at the higher end of discharge pressure • Pulsation analysis performed to size new dampeners designed for this application • Initial model results matched well with field data and the model with the new dampener showed sufficient attenuation of the pump excitations, similar to Field Test Case 7 results. Blue: Original System ...

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  • Centrifugal pump system tips, do's and dont's

    2019-3-14 · Pump selection. Select your pump based on total head (not discharge pressure) and flow rate. The flow rate will depend on your maximum requirement. Total head is the amount of energy that the pump needs to deliver to account for the elevation difference and friction loss in …

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  • How to Read a Pump Curve: Complete Guide

    2020-11-17 · As discharge pressure increases, keeping viscosity constant, more fluid slips from the discharge side to the suction side of the pump, so the pump must spin at a higher RPM to maintain output. In Fig. 8, a positive displacement pump curve shows the influence of …

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  • What is Centrifugal Pump - Definition

    2019-5-22 · Discharge cavitation occurs when the pump discharge pressure is extremely high or when the discharge flow is restricted and cannot leave the pump (e.g. caused by closed outlet valve). An extremely high discharge pressure results in the majority of the pumped fluid circulating inside the pump. This type of cavitation originates from two sources.

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  • GUIDELINES FOR PUMP SYSTEM DESIGNERS Jacques

    2011-8-12 · 3. Use pressure gauges Make sure your pump has a pressure gauge on the discharge side close to the outlet of the pump this will help you diagnose pump system problems. It is also useful to have a pressure gauge on the suction side, the difference in pressure is proportional to the total head. The pressure gauge reading will have to be corrected ...

    Get Price
  • Efficiency of pumps in parallel operation on long ...

    2018-5-29 · of water is usually done by multiple, constant speed, high pressure, multi-stage, centrifugal pumps operating in parallel. Such pumps operate from a common suction line and discharge into a common manifold. As a result intake and discharge pressures as well as the flow rates are correlated, which complicates the

    Get Price
  • Parallel Operation of Pump - CR4 Discussion Thread

    2011-3-6 · Reply of your question is 1-Rated capacity of single pump is 60cu.m/hr with discharge pressure of 40Kg/sq.cm 2-Flow rate sometimes increase to 67 to 70 cu.m/hr so we have to operate other pump in parallel 3-It is six stage centrifugal pump. I think its sufficient? Moreover, these pumps are equipped with minimum flow devices with by-pass feature.

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  • Why pumps are used in parallel and series mode of

    17 小时前 · Pump cavitation occurs when the pressure in the pump inlet drops below the vapour pressure of the liquid. Vapour bubbles form at the inlet of the pump and are moved to the discharge of the pump where they collapse and make high sound and vibrations often taking small pieces of the pump with them.

    Get Price
  • Parallel or Series pump operation for selecting a

    Parallel or Series pump operation (parallel operation) When pumps operate in parallel, clearly specify “Auto Start required” Pumps that have stable head/flowrate curves (continuous head rise to shutoff) are preferred for all applications and are required if parallel operation is specified. If parallel operation is specified, the head rise ...

    Get Price
  • Sudden Drop of Pump Discharge Pressure - CR4

    2011-3-13 · 1. Pump B had run well 2 months ago in 7 days, then stopped for minor maintenance of electric motor. After the motor installed, we started it again and then the discharge pressure of Pump B went down. We didn't do anything with the pump. I think the direction was correct since we didn't move the pump and the motor turned on the right direction.

    Get Price
  • Multiple Centrifugal Pumps In Series And Parallel ...

    2012-12-14 · When we say multiple pumps are in parallel, the flow to the suction is split depending on the number of pumps in parallel and when the individual discharge connections from the individual pumps in parallel unite to form a common discharge pipe or discharge header the flow recombines as a summation of the individual pump flows.

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  • Pump Head vs Discharge Pressure (Easy explanation

    2017-8-10 · The pressure at the discharge of the pump, however, will be higher for the heavier solution. That’s why we would not be able to do simply looking at a pressure gauge and figure out what is pump’s discharge head ability is. Hopefully this post reveal some light on the difference between head and pressure.

    Get Price
  • Centrifugal Pumps - Engineering ToolBox

    2021-5-7 · p 1 = pressure at inlet (N/m 2) ρ = density (kg/m 3) g = acceleration of gravity (9.81) m/s 2. v 2 = velocity at the outlet (m/s) Head described in simple terms. a pump's vertical discharge 'pressure-head' is the vertical lift in height - usually measured in feet or m of water - at which a pump can no longer exert enough pressure to move water.

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  • Problem Solving - Positive Displacement Pumps

    2014-11-19 · Excessive discharge pressure • Valves are closed or there is an obstruction in the discharge pipework. • A strainer of filter is clogged. • Pumped media viscosity is higher than expected. • Discharge pressure is higher than calculated. Excessive temperature • Too high process temperature. • Increase in ambient temperature.

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  • Experiment #10: Pumps – Applied Fluid Mechanics

    If a single pump is incapable of delivering the design flow rate and pressure, additional pumps, in series or parallel with the original pump, can be considered. The characteristic curves of pumps in series or parallel should be constructed since this information helps engineers select the types of pumps needed and how they should be configured.

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