It requires 151 HP to operate a centrifugal...

Question 1 / 205eccef9bbacbc34ba4d45426

Question 1 of 205eccef9bbacbc34ba4d45426

It requires 151 HP to operate a centrifugal pump having a 14.75 inch impeller at 1800 RPM, at a capacity of 2250 GPM with a 218 foot head. If during an overhaul of the pump, the impeller diameter is reduced to 14 inches, the horsepower requirement to operate the pump at the same RPM would be __________.

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🔍 Key Concepts

• Pump affinity laws for changes in impeller diameter at constant RPM • How horsepower relates to changes in impeller diameter when speed is unchanged • The ratio of new diameter to old diameter and how exponents affect power

💭 Think About

• First, write the ratio of new impeller diameter to old impeller diameter, then think about how that ratio affects power according to the pump laws. • Ask yourself: at the same RPM, which variables change with the first power, which with the square, and which with the cube of the diameter? • Once you apply the correct exponent to the diameter ratio, multiply this factor by the original 151 HP to estimate the new required horsepower and compare that to the answer choices.

✅ Before You Answer

• Be sure you are using the pump law that relates power (HP) to impeller diameter, not the ones for flow or head. • Double-check your diameter ratio: use 14 / 14.75, and carry enough decimal places before applying the exponent. • After calculating, confirm that the new horsepower is less than 151 HP, since the impeller is smaller, and see which option is closest to your computed value.

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Question 1 of 20

129 HP

136 HP

143 HP

the same as it was prior to the pump being overhauled

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Question 1 / 205eccef9bbacbc34ba4d45426

Question 1 of 205eccef9bbacbc34ba4d45426

Back

Question 1 of 20

5eccef9bbacbc34ba4d45426

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

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