What is the formula to calculate horsepower for a duplex pump?

Study for the Massachusetts 3rd Class Engineer Exam. Access flashcards and multiple choice questions with hints and explanations. Prepare for success on your exam!

The formula to calculate horsepower for a duplex pump incorporates the flow rate, the height the fluid is being lifted (head), and the specific gravity of the fluid. This means that the horsepower can be determined by taking into account how much fluid is moved, how high it is lifted, and the density of the fluid relative to water.

Using the formula HP = Q x 8.33 x H x Sp. Gr., we see that:

  • Q represents the flow rate in gallons per minute (GPM),

  • 8.33 is a constant that represents the weight of water per gallon in pounds,

  • H stands for the height the fluid is being lifted in feet,

  • Sp. Gr. (specific gravity) is a dimensionless number representing the ratio of the density of a substance to the density of water.

This formula effectively measures the input energy necessary to move a fluid against gravity while accounting for the type of fluid being pumped. By including specific gravity, it allows engineers to calculate the horsepower required for fluids that may not have the same density as water, accommodating different liquids more accurately than a simplified formula might.

In contrast to the other formulas provided, this particular equation ensures a comprehensive calculation by factoring in specific gravity, thus retaining accuracy across

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