Page 6 - SIM Guide to annual assessment_v2.0_Dec 2021

Introduction

ASSESSMENT PRINCIPLES

Basis for the Assessment

The assessment of structures is based on:

• Analysis of structure information: drawings, material specifications, building
codes, etc.

• Visual observations to detect signs of wear, cracks, deflections and deformation
of structural elements affecting the overall integrity.

• Thickness measurements and/or basic non-destructive tests (NDTs) whenever
steel structures can present risk of abrasion or corrosion.

• Inspection of hollow structures:

o Internal inspections of hoppers, bins, and silos particularly where abrasive
material is involved and structures like piers, platforms, conveyors and bridges
to be inspected from underneath.

o For suspended structures, welds which cannot be inspected from inside shall
be subject to ultrasonic testing by a qualified person.

NOTE: Appropriate inspection conditions (access, cleaning, uncovering, lighting) must
be granted. Dust or accumulated material shall be removed if required to allow a
thorough inspection. Binoculars or drones may be required to inspect areas of difficult
access.

Consolidation of findings

• Although the observation of the defects is done for individual elements, the issues
identified on a single structure (or system) shall be grouped into one finding.

• Findings shall be risk rated on its impact in the overall structure integrity.

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