Thickness Testing

Overview

Ultrasonic thickness testing measures a local remaining wall thickness without cutting the component. A repeatable survey can support monitoring of corrosion or erosion.

NDT Australia provides a single enquiry and co-ordination point for industrial inspection through specialist partners. The proposed provider, personnel competence, method-specific qualifications where required, insurance and any separate approval requirements are checked for the actual scope before appointment; no general accreditation or acceptance guarantee is implied.

Assets & Materials

Accessible metallic tank walls, vessels, pipes, chutes and structural sections may be measured where surface condition and geometry allow a reliable back-wall response.

Methods & Limitations

A calibrated gauge and suitable probe take readings at identified points or an agreed grid. Repeat locations, units and reference conditions matter when comparing surveys.

Spot readings do not represent every area between points and can miss isolated pitting. Coating, roughness, curvature and temperature affect readings. A measurement alone does not establish allowable minimum thickness or remaining life.

Typical Defects & Conditions

• Local wall thinning at surveyed positions
• Patterns consistent with corrosion or erosion
• Changes from comparable earlier readings requiring review

Planning the Inspection

Provide nominal thickness, material, previous grids and expected damage locations. Specify whether the aim is a baseline, repeat survey or targeted investigation rather than an undefined whole-asset clearance.

Expected Reporting Deliverables

Request a point or grid map, readings with units, nominal references where known, inaccessible points and the measurement basis. Any minimum-thickness comparison must state its supplied engineering criterion.

Relevant Industries & Practical Guides

water authorities inspection planning

manufacturing inspection planning

mining inspection planning

Commissioning an industrial inspection

Preparing assets and access

Understanding inspection reports and limitations

Applications

Thickness Testing is applied across a wide range of assets and industries, including:

• Accessible metallic tank walls, vessels, pipes, chutes and structural sections may be measured where surface condition and geometry allow a reliable back-wall response.
• Inspection planning for water authorities assets and operators
• Inspection planning for manufacturing assets and operators
• Inspection planning for mining assets and operators

Standards & Competence Context

The references below are planning context, not a claim of accreditation, certified compliance or a universal acceptance rule. Confirm the applicable edition, part, material, procedure and acceptance criteria for this asset. Verify the appointed personnel's method, level and sector competence, insurance and any engineering authority required for the scope before work. A method standard is not itself a return-to-service approval.

• ISO 16809 — Measurement of thickness by ultrasound
• AS 3788 — Pressure equipment in-service inspection

Why Choose NDT Australia

• One enquiry point for scope and specialist-partner co-ordination
• Asset-linked findings with examination extent and limitations
• Separate identification of engineering and operational decisions

Related Articles

Ultrasonic Thickness Testing: Building a Repeatable Corrosion Baseline