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Use the pump map attached, Suppose I want to pump water at 120 gpm against a head of 10 m. a. What size impeller should I use... note it is between two .. do I want the larger or the smaller and why. b. With this impeller, you can read the hp required and the pump efficiency.. report them. c. What input head is required (NPSH)? d. If I use the largest impeller at 120 gpm it should be clear I will generate extra "head" or pressure. What could I do to handle this extra head.. ie to not deliver too much pressure to my system?

Use the pump map attached, Suppose I want to pump water at 120 gpm against a head of 10 m. a. What size impeller should I use... note it is between two .. do I want the larger or the smaller and why. b. With this impeller, you can read the hp required and the pump efficiency.. report them. c. What input head is required (NPSH)? d. If I use the largest impeller at 120 gpm it should be clear I will generate extra "head" or pressure. What could I do to handle this extra head.. ie to not deliver too much pressure to my system?

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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### Centrifugal Pump Performance Chart **Model:** 3657-5½ × 8 Group **Size:** 4 in. **Suction x Discharge:** 5½ × 2 × 8 **RPM:** 1750 **Capacity:** Ranges from 0 to 140 U.S. gallons per minute (GPM) or 0 to 30 cubic meters per hour (m³/hr). **Key Components:** - **Total Dynamic Head (TDH):** Displayed on the left vertical axis in both feet and meters (ranging from 0 to 160 feet or 0 to 70 meters). - **Capacity:** On the bottom horizontal axis in both U.S. gallons per minute and cubic meters per hour. - **Efficiency Curves:** Shown as multiple curved lines indicating percentage levels (e.g., 40%, 50%, 60%, etc.). Higher efficiency curves are positioned towards the upper right. - **Performance Curves:** Indicated by individual lines, each marked with designations such as PEER, NSBR, REER, etc., accompanied by specific numbers like (12626), (12925), etc. - **Net Positive Suction Head Required (NPSHr):** Indicated at 10 feet. **Operating Guidelines:** - **Note:** Operation is not recommended beyond the indicated range on the chart to ensure efficient performance and prevent damage. This chart is a graphical representation of the pump's performance characteristics at a speed of 1750 RPM, displaying the relationship between flow capacity, total dynamic head, and efficiency for the specified model. Understanding these curves helps in selecting the right pump for the intended application and ensuring optimal operation.
Transcribed Image Text:### Centrifugal Pump Performance Chart **Model:** 3657-5½ × 8 Group **Size:** 4 in. **Suction x Discharge:** 5½ × 2 × 8 **RPM:** 1750 **Capacity:** Ranges from 0 to 140 U.S. gallons per minute (GPM) or 0 to 30 cubic meters per hour (m³/hr). **Key Components:** - **Total Dynamic Head (TDH):** Displayed on the left vertical axis in both feet and meters (ranging from 0 to 160 feet or 0 to 70 meters). - **Capacity:** On the bottom horizontal axis in both U.S. gallons per minute and cubic meters per hour. - **Efficiency Curves:** Shown as multiple curved lines indicating percentage levels (e.g., 40%, 50%, 60%, etc.). Higher efficiency curves are positioned towards the upper right. - **Performance Curves:** Indicated by individual lines, each marked with designations such as PEER, NSBR, REER, etc., accompanied by specific numbers like (12626), (12925), etc. - **Net Positive Suction Head Required (NPSHr):** Indicated at 10 feet. **Operating Guidelines:** - **Note:** Operation is not recommended beyond the indicated range on the chart to ensure efficient performance and prevent damage. This chart is a graphical representation of the pump's performance characteristics at a speed of 1750 RPM, displaying the relationship between flow capacity, total dynamic head, and efficiency for the specified model. Understanding these curves helps in selecting the right pump for the intended application and ensuring optimal operation.
**Problem Statement for Pump Selection and Operation:** 7. **Scenario**: You are tasked with pumping water at a rate of 120 gallons per minute (gpm) against a head of 10 meters using the attached pump map. a. **Impeller Size Selection**: Determine the appropriate size of the impeller to use. This choice is between two available options. Decide whether the larger or smaller impeller is suitable and justify your decision. b. **Performance Metrics**: With the chosen impeller, ascertain the horsepower (hp) required and the efficiency of the pump. Document these findings. c. **Net Positive Suction Head (NPSH)**: Calculate the input head required for operation. d. **Managing Excess Pressure**: If utilizing the largest impeller at 120 gpm, anticipate that additional "head" or pressure will be generated. Propose solutions to manage this excess head to prevent over-pressurizing the system.
Transcribed Image Text:**Problem Statement for Pump Selection and Operation:** 7. **Scenario**: You are tasked with pumping water at a rate of 120 gallons per minute (gpm) against a head of 10 meters using the attached pump map. a. **Impeller Size Selection**: Determine the appropriate size of the impeller to use. This choice is between two available options. Decide whether the larger or smaller impeller is suitable and justify your decision. b. **Performance Metrics**: With the chosen impeller, ascertain the horsepower (hp) required and the efficiency of the pump. Document these findings. c. **Net Positive Suction Head (NPSH)**: Calculate the input head required for operation. d. **Managing Excess Pressure**: If utilizing the largest impeller at 120 gpm, anticipate that additional "head" or pressure will be generated. Propose solutions to manage this excess head to prevent over-pressurizing the system.
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