Work Item
ASTM WK87447

New Practice for Conducting a Coating/Lining Detachment Acoustical Sounding (Tapping) Inspection

1. Scope

This standard practice describes a method for conducting a qualitative acoustical sounding inspection by lightly tapping newly-applied and previously installed coating/lining systems with a hand-held tool to assess potential detachment from the substrate, prior to visible disbondment. A procedure is prescribed to help ensure reproducibility of the respective sounding methodology. Interpretation of the sound is qualitative and typically requires assessor training consistent with the generic type of coating or lining system being evaluated.


Acoustical sounding inspection, Tap test, Coating detachment testing


The practice of conducting an acoustical sounding inspection by lightly tapping an installed protective coating/lining system has been used in several industries for helping to determine whether the coating or lining is intact or starting to detach from the substrate. Committee D33 initiated the development of a standard practice in 2019 but the process stalled. Since this practice is used in industries beyond power generation, it was subsequently determined that subcommittee D01.46 should have jurisdiction over development and maintenance.

The title and scope are in draft form and are under development within this ASTM Committee.


Developed by Subcommittee: D01.46

Committee: D01

Staff Manager: Jennifer Tursi

Work Item Status

Date Initiated: 08-10-2023

Technical Contact: Bill Corbett

Item: 000