### Educational Article: Understanding Pump Performance Curves#### Figure Analysis: Performance Curve of Model 5009 Centrifugal PumpsThe figure displays the performance curve family of Model 5009 Centrifugal Pumps by Taco Pump Inc., operating at a fixed speed of 1160 RPM. The objective is to identify the best efficiency point (BEP) for a pump with an impeller diameter of 8.625 inches and determine the pump efficiency at BEP.#### Graph Explanation- **Axes:** - **X-axis (Horizontal):** Represents the flow rate in gallons per minute (GPM), ranging from 0 to 1000. - **Y-axis (Vertical):** Represents the head in feet, ranging from 0 to 50.- **Impeller Diameter Curves:** - The curves labeled with different diameters (6.75", 7.375", 8.00", 8.625", 9.25") show the head-flow characteristics for various impeller sizes at the specified speed.- **Efficiency Contours:** - Curved lines labeled with percentages (e.g., 50%, 60%, 70%) show the efficiency levels across the operating range.- **Required NPSH (Net Positive Suction Head):** - A line indicating the minimum NPSH required for safe operation, depicted on the right side.#### Determining Best Efficiency Point (BEP)For an impeller diameter of 8.625 inches, locate the point on the curve where the efficiency contour is highest. This point corresponds to the BEP and represents optimal performance.#### Options and Correct AnswerIdentifying efficiency at BEP from the graph: - **Options:** - 81% - 51% - 71% - 61%The efficiency at the BEP for this impeller diameter is approximately **81%**, as seen from the intersection of the 8.625-inch curve with the highest efficiency contour.This analysis helps in selecting the right pump for specific applications, ensuring maximum efficiency and performance.

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Figure below shows the performance curve family of Model 5009 Centrifugal pumps of Taco Pump Inc., running at a fixed speed of N = 1160 rpm. For the pump with the impeller diameter D = 8.625 in., you are asked to determine the best efficiency point (BEP) of the given pump. What is the pump efficiency at BEP?

Figure below shows the performance curve family of Model 5009 Centrifugal pumps of Taco Pump Inc., running at a fixed speed of N = 1160 rpm. For the pump with the impeller diameter D = 8.625 in., you are asked to determine the best efficiency point (BEP) of the given pump. What is the pump efficiency at BEP?

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Question

### Educational Article: Understanding Pump Performance Curves

#### Figure Analysis: Performance Curve of Model 5009 Centrifugal Pumps

The figure displays the performance curve family of Model 5009 Centrifugal Pumps by Taco Pump Inc., operating at a fixed speed of 1160 RPM. The objective is to identify the best efficiency point (BEP) for a pump with an impeller diameter of 8.625 inches and determine the pump efficiency at BEP.

#### Graph Explanation

- **Axes:**
- **X-axis (Horizontal):** Represents the flow rate in gallons per minute (GPM), ranging from 0 to 1000.
- **Y-axis (Vertical):** Represents the head in feet, ranging from 0 to 50.

- **Impeller Diameter Curves:**
- The curves labeled with different diameters (6.75", 7.375", 8.00", 8.625", 9.25") show the head-flow characteristics for various impeller sizes at the specified speed.

- **Efficiency Contours:**
- Curved lines labeled with percentages (e.g., 50%, 60%, 70%) show the efficiency levels across the operating range.

- **Required NPSH (Net Positive Suction Head):**
- A line indicating the minimum NPSH required for safe operation, depicted on the right side.

#### Determining Best Efficiency Point (BEP)

For an impeller diameter of 8.625 inches, locate the point on the curve where the efficiency contour is highest. This point corresponds to the BEP and represents optimal performance.

#### Options and Correct Answer

Identifying efficiency at BEP from the graph:
- **Options:**
- 81%
- 51%
- 71%
- 61%

The efficiency at the BEP for this impeller diameter is approximately **81%**, as seen from the intersection of the 8.625-inch curve with the highest efficiency contour.

This analysis helps in selecting the right pump for specific applications, ensuring maximum efficiency and performance.

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