FUNDAMENTALS OF FLUID MECHANICS Chapter 12 Pumps and Turbines. Typical positive displacement pumps: (a) tire pump, (b) human heart, (c) gear pump. 6 Turbomachines. In a turbomachine a series of particles (a continuum) passes through the rotor. For steady flow, the moment of momentum equation. Pumps in Parallel: When two or more similar pumps are connected in parallel, the head across each pump is the same and the total flow rate is shared equally between the pumps, QP/n, where n is the number of pumps in parallel. Pumps operating in series Pumps operating in parallel. To connect two pumps in series means that the Figure 15 presents a parallel configuration of discharge from the first pump is piped into the inlet two pumps. A typical example of this arrangement side of the second pump (Figure 13). Pump, P2 Speed Pump, P1 Figure 3: Series/parallel pump (Model:FM07A) 5.0PROCEDURE Before conducting any experiment, it is necessary to do the following checking to avoid any misused and malfunction of equipment. 3 5.1 Single pump operation 1. The circulation tank is filled with water. Make sure V5 (Figure 4) is in fully close position. Pump Manual HORIZONTAL CLOSE COUPLED FLEXIBLE COUPLED. T31 SERIES General Instructions CLOSE COUPLED PUMPS FLEXIBLE COUPLED PUMPS A. Inspection of Equipment B. Placing Stored Pumps Into Service D. Application Considerations. In parallel, is the safest and many times the most cost effective choice. FOR IMPORTANT SERVICES - a stand.
When paired with the Bell & Gossett e-80 and e-1510 hydraulic pumps, the Technologic PPS parallel pump controller allows you to set up a parallel pumping system – up to eight pumps – and optimize for efficiency. It comes with more standard features that other comparable systems such as color touch screen, real time display of control and system curve and the Bell and Gossett entire pump library inside. It can be used for retrofit and new installations, thanks to the ability of the controller to use either sensored or sensorless input.
Add the advanced Technologic IPC variable speed controller to the system for smooth, high-efficiency operation. It provides variable flow or pressure control for changing system needs, can manage systems from 3/4 hp, is easy to program, and is designed for both indoor and outdoor site conditions.
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- Select the most efficient hydraulic configuration using up to eight pumps in parallel operation.
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Integrated Parallel Pumping System with Sensorless and Sensored Control (D 613)
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For pumps connected in serial - add head, for pumps connected in parallel - add flowrates
Pumps can be arranged and connected in serial or parallel to provide additional head or flow rate capacity.
Pumps in Serial - Head Added
Pumps In Series And Parallel Pdf To Doc
When two (or more) pumps are arranged in serial their resulting pump performance curve is obtained by adding their heads at the same flow rate as indicated in the figure below.
Centrifugal pumps in series are used to overcome larger system head loss than one pump can handle alone.
- for two identical pumps in series the head will be twice the head of a single pump at the same flow rate - as indicated with point 2.
With a constant flowrate the combined head moves from 1 to 2 - BUT in practice the combined head and flow rate moves along the system curve to point 3.
- point 3 is where the system operates with both pumps running
- point 1 is where the system operates with one pump running
Note that for two pumps with equal performance curves running in series
- the head for each pump equals half the head at point 3
- the flow for each pump equals the flow at point 3
Operation of single stage pumps in series are seldom encountered - more often multistage centrifugal pumps are used.
Pumps in Parallel - Flow Rate Added
When two or more pumps are arranged in parallel their resulting performance curve is obtained by adding the pumps flow rates at the same head as indicated in the figure below.
Centrifugal pumps in parallel are used to overcome larger volume flows than one pump can handle alone.
- for two identical pumps in parallel and the head kept constant - the flow rate doubles compared to a single pump as indicated with point 2
Resistors In Series And Parallel
Note! In practice the combined head and volume flow moves along the system curve as indicated from 1 to 3.
- point 3 is where the system operates with both pumps running
- point 1 is where the system operates with one pump running
In practice, if one of the pumps in parallel or series stops, the operation point moves along the system resistance curve from point 3 to point 1 - the head and flow rate are decreased.
Note that for two pumps with equal performance curves running in parallel
- the head for each pump equals the head at point 3
- the flow for each pump equals half the flow at point 3
Note - for parallel operation
- zero flow or “shut valve” heads must match for the pumps
- unstable pump curves must be avoided
- steeper pump curves are preferred
Related Topics
- Pumps - Piping systems and pumps - centrifugal pumps, displacement pumps - cavitation, viscosity, head and pressure, power consumption and more
Related Documents
- Alternating Pumps - Securing a system and achieve equal wear by alternating pumps in parallel
- Centrifugal Pumps - An introduction to Centrifugal Pumps
- Pipes - in Series or Parallel - Pressure loss in pipes connected in series or parallel
- Positive Displacement Pumps - Introduction tutorial to positive displacement pumps basic operating principles
- Pumping Water - Energy Cost Calculator - The energy costs of pumping water
- Pumping Water - Required Horsepower - Horsepower required to pump water
- Static Pressure vs. Head in Fluids - Static pressure and pressure head in fluids
- System Curve and Pump Performance Curve - Utilize the system curve and the pump performance curve to select the proper pump for a particular application
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