Standard Practice for Examination of Mill and Kiln Girth Gear Teeth—Electromagnetic Methods

Importancia y uso:

5.1 Visual interpretation of gear teeth condition is different from examining for cracks or early signs of macro-pitting. Visual interpretation is referred to ASNI/AGMA 1010-F14.

5.1.1 The purpose of using an eddy current array for mill girth gear tooth examination is it drastically reduces the examination time; covers a large area in one single pass; provides real-time cartography of the examined region, facilitating data interpretation; and improves reliability and probability of detection (POD). One tooth can be examined in less than 30 seconds.

Note 3: In this practice, ECA is used as a discontinuity finding tool (see Fig. 4) and a presentation aid as support once problems are discovered and photographed. Colors and three-dimensional (3D) images (see Fig. 5) that help with visualization are invaluable in such circumstances.

5.1.2 The purpose of using alternating current field measurement is to size surface-breaking cracks electronically.

5.1.3 This practice is a useful tool for a condition-based monitoring program.

5.2 The examination results may then be used by qualified personnel or organizations to assess the severity and potential consequences of the failure modes identified. This practice is not intended for the examination of non-surface-breaking discontinuities. Other methods should be considered to address examination for non-surface-breaking discontinuities.

Subcomité:

E07.07

Referida por:

E0543-21, E0543-21

Volúmen:

03.04

Número ICS:

21.200 (Gears)

Palabras clave:

alternating current field measurement; crack; eddy current; eddy current array; electromagnetic examination; gear; gear examination; gear teeth; girth gear; kiln gear; macro-pitting; micro-pitting; mill gear; nondestructive examination; open gear; pitting;