Why must extreme caution be used when disconnecting air lines even with lockout procedures in place?

Why must extreme caution be used when disconnecting air lines even with lockout procedures in place?

• A. Residual oil buildup
• B. Electrical shock
• C. Unrelieved pressure can cause whiplash of the line
• D. Noise

Answer: (C)

Air lines store energy as compressed air. Even with lockout procedures in place, pressure can remain in the hose and fittings. When you disconnect, that stored energy can be released suddenly, causing the line to whip or spring back and potentially strike you or bystanders or cause injury. That abrupt movement is what makes this step so hazardous. The safe approach is to relieve the pressure first—isolate the supply, bleed the line at a safe point, and then disconnect while keeping well clear of the hose end. The other options describe different hazards that aren’t the immediate risk when releasing a pressurized line.

Air lines store energy as compressed air. Even with lockout procedures in place, pressure can remain in the hose and fittings. When you disconnect, that stored energy can be released suddenly, causing the line to whip or spring back and potentially strike you or bystanders or cause injury. That abrupt movement is what makes this step so hazardous. The safe approach is to relieve the pressure first—isolate the supply, bleed the line at a safe point, and then disconnect while keeping well clear of the hose end. The other options describe different hazards that aren’t the immediate risk when releasing a pressurized line.