The ball float shown in the illustration is 7 inches in diameter, with an effective float arm of 31.5 inches and floats in a liquid with a specific gravity of 0.95. What is the operating torque of the system? See illustration GS-0158.
• Use the chart in illustration GS-0158 to find the available operating force for a 7-inch ball at a specific gravity of 0.95
• Convert that operating force into torque by multiplying by the effective float arm length (31.5 inches):
( T = F \times L )
• Understand that torque units here are inch-pounds, so keep force in pounds and arm in inches
• On the chart, which curve corresponds to a 7-inch diameter ball, and where does it intersect the horizontal line for 0.95 specific gravity? • After you read the approximate available operating force from the x-axis, what torque do you get when you multiply that force by 31.5 inches? • Compare your calculated torque with the choices given; which option is closest to your computed value?
• Be sure you are using the 7-inch diameter curve, not 6-inch or 8-inch • Make sure you read the available operating force from the x-axis, not from the vertical axis • Confirm your final torque uses inch-pounds: force (lb) × 31.5 in, with no unit conversions needed
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