What is the acceptable tolerance for a flowmeter to be considered in good working order?

Answer: B — ±3%

A flowmeter is a critical device used in firefighting operations to ensure accurate measurement of water flow during fire suppression efforts. The acceptable tolerance for a flowmeter to be considered in good working order is typically ±3%. This level of tolerance ensures that the readings from the flowmeter are sufficiently precise for operational decision-making, allowing fire personnel to assess whether they are delivering adequate water supply to combat a fire. The ±3% tolerance is regarded as the standard because it balances the need for precision with practical considerations in field operation. This level of accuracy helps in planning and executing effective firefighting strategies, ensuring that the flow of water is both sufficient and safe for the given scenario. It ensures that fire operators can depend on the flowmeter's readings without excessive variability that could lead to under- or overestimating water needs in critical situations. Tolerances outside of this range may indicate that the flowmeter is malfunctioning or has drifted out of calibration, potentially leading to serious operational risks during firefighting efforts.