If you have a duplex single acting...

Question 1 / 270705eccef9bbacbc34ba4d45528

Question 1 of 270705eccef9bbacbc34ba4d45528

If you have a duplex single acting reciprocating pump making 160 strokes/minute, with a 6" diameter cylinder, a 9" stroke and operating with 85% volumetric efficiency, what is the capacity of this pump?

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Question 1 of 27070

🔍 Key Concepts

• Duplex single-acting reciprocating pump – how many cylinders are pumping and how many discharges per stroke? • Volume per stroke = piston area × stroke length (in consistent units). • Convert cubic inches per minute to gallons per minute (gpm) and then apply volumetric efficiency.

💭 Think About

• First, find the piston area of a 6" diameter cylinder and multiply by the 9" stroke to get volume per stroke (in³). • Decide how a duplex and single-acting arrangement affects the total number of pumping strokes per minute. • After you get total in³/min, convert to gallons per minute and then reduce it by the 85% volumetric efficiency. Which option is closest?

✅ Before You Answer

• Be clear on whether a duplex pump has one or two water cylinders contributing to flow. • Confirm that single-acting means the piston delivers water on only one direction of travel, not both. • Use the correct conversion: 231 in³ = 1 gallon, and make sure your final units are in gpm.

Question 1 of 27070

150 gpm

225 gpm

75 gpm

300 gpm