Which type of handles should not be removed or altered to hinder operation?

The type of handles that should not be removed or altered to hinder operation are valve handles. This is important because valve handles control the flow of fuel oil through the piping systems. If valve handles are removed or modified, it can lead to operational hazards, including the inability to shut off the flow in an emergency or to perform essential maintenance safely. Maintaining the integrity and operation of valve handles ensures that the systems function as designed and comply with safety regulations. It is critical for personnel to have immediate access to valves to manage fuel oil delivery and to mitigate risks associated with leaks or spills. Having easily operable valve handles is an essential aspect of maintaining safe operations and disaster preparedness in fuel oil systems.