Question 398General Subjects - Assistant Engineer70% to pass
If you have a duplex, single acting, reciprocating pump making 140 strokes/minute with a 3" diameter cylinder, and a 12" stroke with a 94% volumetric efficiency, what is the capacity of this pump?
AI Explanation
The correct answer is C) 48 gpm.
To calculate the capacity of the pump, we can use the formula:
Capacity (in gallons per minute) = (Piston Displacement) x (Strokes per Minute) x (Volumetric Efficiency)
Where:
- Piston Displacement = (π/4) x (Diameter^2) x (Stroke)
- Strokes per Minute = 140
- Volumetric Efficiency = 94%
Plugging in the values:
- Piston Displacement = (π/4) x (3^2) x 12 = 85.03 cubic inches
- Strokes per Minute = 140
- Volumetric Efficiency = 94%
Capacity = (85.03 cubic inches) x (140 strokes/minute) x (0.94) / (231 cubic inches/gallon) = 48 gpm
The other options are incorrect because they do not match the calculated capacity of 48 gpm.
Related Questions
#396 Which of the pumping systems listed for use aboard ship will most likely use a propeller type pump? #397 The suction-force principle of operation is a typical characteristic of _______________.#399 To safely remove the piston rod packing from the steam end of a reciprocating pump, you should _______________.#400 Which of the lubricants listed is the best to use on a reciprocating pump rod? #401 The first step when resetting the slide valves on a duplex reciprocating pump is to _______________.