A blue-yellow-blue printed symbol identification tape on an aluminum line indicates

A blue-yellow-blue printed symbol identification tape on an aluminum line indicates

• A. Pneumatic air
• B. Fuel line
• C. Hydraulic pressure oil
• D. Electrical power lines

Answer: (C)

Line identification tapes use color patterns to convey what a line carries and how it should be treated. A blue-yellow-blue printed symbol on an aluminum line is a code that identifies the line as carrying hydraulic fluid under pressure. This quick visual cue helps technicians avoid connecting or disconnecting the wrong system and reminds them to take proper safety steps when servicing or routing lines, since hydraulic oil under pressure can be hazardous and requires relieving pressure before work. This pattern differs from identifiers used for other systems: pneumatic air lines, fuel lines, and electrical power lines each have their own distinct markings, so seeing the blue-yellow-blue tape specifically points to a hydraulic oil line rather than those other systems.

Line identification tapes use color patterns to convey what a line carries and how it should be treated. A blue-yellow-blue printed symbol on an aluminum line is a code that identifies the line as carrying hydraulic fluid under pressure. This quick visual cue helps technicians avoid connecting or disconnecting the wrong system and reminds them to take proper safety steps when servicing or routing lines, since hydraulic oil under pressure can be hazardous and requires relieving pressure before work.

This pattern differs from identifiers used for other systems: pneumatic air lines, fuel lines, and electrical power lines each have their own distinct markings, so seeing the blue-yellow-blue tape specifically points to a hydraulic oil line rather than those other systems.