What is required regarding pipe identification markings?

• A. They may be painted over after approval
• B. They shall not be painted over, concealed, or removed prior to approval
• C. They may be hidden behind insulation
• D. They must be replaced monthly

Answer: (B)

Identifying pipe markings must stay visible and legible at all times. They should not be painted over, concealed, or removed without prior approval. Keeping markings accessible ensures anyone working with or responding to the system can quickly determine what clean agent is in the pipe and where it runs, which is essential for safe operation, proper maintenance, and effective emergency actions. Altering or hiding markings without authorization can lead to misidentification and unsafe actions, so changes require proper approval and documentation. Replacing markings monthly or hiding them behind insulation without approval isn’t required and would defeat their purpose.