What is one of the steps required before starting up a steam system concerning safety?

One of the critical steps required before starting up a steam system is ensuring that safety valves and vents are prepared for operation. Safety valves are crucial components of a steam system as they prevent the pressure from exceeding safe levels by automatically releasing steam when necessary. This function is vital to maintaining the integrity and safety of the system, protecting both personnel and equipment from potential hazards associated with overpressure scenarios.

Preparing safety valves and vents for operation includes checking for any blockages, ensuring that they are not stuck or malfunctioning, and confirming that they are set to open at the correct pressure settings. This preparation ensures that in the event of an unexpected increase in pressure, the safety mechanisms will activate as intended, allowing for controlled venting of steam and preventing potentially catastrophic failures.

While other options may pertain to maintaining a steam system, they do not directly address the critical safety aspect as it relates to the specific needs of pressure control before the system is operational.