CC008 Internal corrosion and erosion failure mechanisms

Competency ID
and title

CC008 Internal corrosion and erosion failure mechanisms

Competency area

Corrosion control

Stream/s

Design, Operations

Level

Elective

Knowledge

Understanding of different types of internal corrosion, including:

·         pitting and crevice corrosion

·         galvanic corrosion

·         erosion corrosion

·         under deposit corrosion

·         microbiologically influenced corrosion

·         top of line corrosion

·         hydrogen induced corrosion.

Understanding of the range of internal corrosion and erosion mechanisms and contributing factors applicable to pipelines and facilities, including:

·         effect and sources of water, salt, CO2, H2S, oxygen, organic acids, bacteria, scale, deposits and pH

·         effect of flow regimes and pipeline topography

·         corrosion resistance of steel and effect of steel composition

·         inhibitor limitations and implications.

Methods for preventing and mitigating each corrosion type and mechanism, including:

·         selection of appropriate materials

·         use of inhibitors

·         use of protective coatings

·         monitoring and inspection techniques

·         design limitations or allowances

·         requirements for pressure vessels

·         requirements for the temporary corrosion protection of equipment during transport and storage.

Limitations of internal assessment: including:

·         NDT techniques

·         association with external corrosion

·         repair and mitigation issues vs external corrosion

·         non-piggable pipelines.

Requirements of AS 2885.3 Section 5 – Pipeline Integrity Management.

Requirements for data management of corrosion defect information from a range of sources.

Regulatory requirements.

Experience

At least 18 months working in the pipeline industry that involves a proportion of time working with corrosion specialists who are identifying, preventing and mitigating internal corrosion on pipelines and related facilities.

Expertise

Identifies existing potential sources of internal corrosion and/or erosion on a pipeline or facility as part of corrosion management process.

Determines when corrosion specialists must be commissioned to undertake design work or undertake inspection and assessments for operating pipelines and facilities.

Briefs and scopes work to be undertaken by corrosion specialist in respect of design requirements to minimise internal corrosion and investigations on operating pipelines.

Understands and applies reports and recommendations by corrosion specialists.

Oversees detection corrosion on pipelines and facilities and development of plans to mitigate further corrosion once detected, including use of in-line inspection.