What is a safe practice when testing a pneumatic system?

• A. Depressurize, cap or clamp lines if possible, wear eye protection, and test with appropriate safety precautions.
• B. Increase pressure gradually without eye protection.
• C. Only test with sealed lines, no protective equipment.
• D. Ignore safety precautions as pneumatic systems are low risk.

Answer: (A)

Testing a pneumatic system safely starts with removing stored energy and protecting yourself from any unexpected release. Depressurizing the system beforehand eliminates hidden pressure that could surge when you reconnect lines or operate valves. If possible, cap or clamp the lines so a stray fitting or hose can't come loose and become a dangerous projectile. Wearing eye protection is essential because even small leaks or bursts can send high-speed air, oil, or debris toward your eyes. Following appropriate safety precautions means using proper PPE, working with a partner if needed, and using equipment rated for the system's pressure. This approach directly reduces the main hazards of compressed air: sudden pressure release, flying debris, and unanticipated line movement. Raising pressure without eye protection invites a risk to your eyes from a potential blowout. Testing with sealed lines and no protective equipment keeps you exposed to energy that could release explosively. Ignoring safety precautions assumes the risk is negligible, which isn't true for pressurized systems.