What method is used to calculate the water supply demand for sprinkler systems?

The hydraulic calculations method is used to calculate the water supply demand for sprinkler systems because it involves evaluating the flow rates, pressure losses, and water distribution within the piping system. This method ensures that adequate water is supplied to all parts of the system to effectively protect the area from potential fire hazards.

Using hydraulic calculations allows technicians to determine the required gpm (gallons per minute) for the system, accounting for variables such as the number of sprinkler heads, their specific discharge characteristics, the distance the water must travel, and any changes in elevation. By analyzing these factors, the technician can ensure that the system will function correctly under the expected fire conditions.

The other methods listed do not directly relate to calculating water supply demand for sprinkler systems. For instance, pressure testing evaluates the system's integrity and leaks, flow rate assessments measure how much water can be delivered but do not incorporate system pressure losses or layout, and water quality analysis focuses on the physical and chemical properties of the water rather than the demand calculation for fire protection systems.