Before attempting repairs on the pressure system of compressors or related equipment, what must be done?

When performing repairs on the pressure system of compressors or related equipment, it is crucial to bleed off the pressure. This step is essential to ensure safety and prevent accidents that could occur if pressurized equipment is tampered with. By bleeding off the pressure, you eliminate the risk of sudden release of stored energy, which could lead to injury or equipment damage.

Handling equipment that is under pressure can be extremely dangerous, as it may cause explosive decompression, flying debris, or other hazardous situations. Therefore, it is a standard safety practice to relieve any built-up pressure before initiating any maintenance or repair work.

While the other options contribute to a safe working environment—like turning off the equipment, wearing safety gear, and clearing the area of personnel—they do not specifically address the immediate and critical need to manage the pressure within the system being repaired.