2. Adjusting the pump to your needs

Figure 1 - Pumping in a forebay: priming devices

Figure 2 - Centrifugal pump: evolution of operating point during start-up period

Figure 3 - Centrifugal pump: torque evolution during the start-up period

Figure 4 - Evolution of the operating point when the pump characteristic curve reaches a maximum

Figure 5 - Propeller pump: evolution of operating point during start-up

Figure 6 - Operation of pumps connected in series (general case)

Figure 7 - Parallel pump operation (general case)

Figure 8 - Parallel pumps with a maximum characteristic curve

Figure 9 - Variable speed flow control

Figure 10 - Flow control by rolling on discharge

Figure 11 - By-pass flow control

Figure 12 - Generalized pump operating characteristics in all four quadrants

Figure 13 - Generalized operating characteristics of a centrifugal pump (NS &#61; 35)

Figure 14 - Generalized operating characteristics of a propeller pump (NS &#61; 262)

Figure 15 - Cutting a wheel: transforming the gear triangle

Figure 16 - Displacement of a point on the characteristic curve of a centrifugal pump by cutting off the impeller

Figure 17 - Example of a simple geometry centrifugal pump impeller cut-out

Figure 18 - Efficiency of centrifugal pumps as a function of cut-off time

Figure 19 - Example of displacement, by cutting the wheel, of a characteristic curve using Rateau&#039;s coefficients

Figure 20 - Cutting a pump impeller with variable width and output angle: speed triangle at the point of best efficiency

Figure 21 - Cutting a pump impeller: transposition of a point on the characteristic curve (changing width and angles)

Figure 22 - Sharpening a blade to increase the neck

Figure 23 - Displacement of the characteristic curve of a centrifugal pump after widening the outlet neck

Figure 24 - Influence of diffuser throat cross-section on pump characteristic curve

Figure 25 - Influence of a distributor upstream of the impeller on the characteristic curve of a centrifugal pump