How is the lift capacity of a bag determined?

• A. Height x width x operating pressure
• B. Length x width x operating pressure
• C. Area x pressure
• D. Length x height x width

Answer: (B)

Lift capacity comes from pressure acting over the bag’s base area. The force the bag can exert while lifting is the internal operating pressure multiplied by the area of contact with the surface. For a rectangular bag, that base area is length times width, so the lift capacity is length × width × operating pressure. The height of the bag doesn’t contribute to the lifting force; it mainly affects how high or how much travel the bag has, not how much load it can lift.