Which of the following is a common maintenance task for standpipe systems?

Checking for leaks and securing all fittings is a common maintenance task for standpipe systems because it ensures the integrity and functionality of the system. Regular inspections help identify any potential issues, such as leaks, that could compromise the pressure or flow rate of the water supply during a fire emergency. Securing fittings is also crucial, as loose connections could lead to water loss or failure of the system in an emergency situation.

Routine maintenance like this is part of best practices for ensuring that standpipe systems operate effectively and are ready to provide the necessary support during fire suppression efforts. The other options, while they may involve different aspects of fire safety or system upgrades, are not considered routine maintenance tasks in the context of standpipe systems. Replacing the entire piping system is not common unless there is a significant failure, painting is not necessary for functionality, and installing additional fire alarms is a different aspect of safety measures rather than maintenance.