What safety measure should be taken for portable systems connected by flexible hoses?

When ensuring safety for portable systems connected by flexible hoses, disconnecting the hoses from the pressure source is crucial. This measure is vital because it eliminates the risk of accidental pressure discharge during maintenance or inspection, which could lead to injuries or equipment damage. By disconnecting the hoses, you create a safer work environment, allowing for proper assessments and repairs without the hazard of the system being pressurized.

While securing hoses and inspecting them for wear are important practices and contribute to overall safety, they do not address the immediate risk posed by pressurized hoses during maintenance directly. Keeping valves open, on the other hand, can be hazardous, as this may allow pressure to remain or escape through the hoses, contradicting the goal of safety during servicing operations. Hence, identifying the need to disconnect hoses from their pressure sources significantly enhances safety during maintenance tasks.