To determine whether moisture on a pipe is caused by an active leak or normal thermodynamic sweating, perform a paper towel test. First, wipe the entire damp pipe surface completely dry with paper towels, then wrap a fresh, dry paper towel securely around the pipe and leave it for a few hours. If the paper towel becomes soaked from a specific localized point or drip, you have an active pipe leak. If the entire towel dampens uniformly from ambient air moisture, it is harmless condensation. Verification: Inspect pipe joints and fittings closely for cracks or corrosion.
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