Turnkey Stress Corrosion Cracking DA Evaluation Services (SCCDA)
Mears Group, Inc offers complete pipeline integrity solutions for a broad range of integrity threats on operating pipeline systems. Stress Corrosion Cracking (SCC) is an environmentally assisted cracking mechanism that affects pipelines operating at higher stress levels in susceptible environments. Mears provides complete turnkey services to assess, evaluate and mitigate SCC using Direct Assessment and a specially developed SCC prediction model.
Mears’ SCCDA Service Package
- Preparation of procedures and protocols written to ensure consistent and technically sound applications of SCCDA on buried pipeline segments;
- Implementation of the four step process: Pre-assessment, Indirect Inspections, Direct Examination and Post Assessment. With an exceptional commitment to safety, Mears Delivers turnkey SCC services from engineering and field surveys to construction/excavation expertise, and
- Implementation of the Mears SCC Model which consists of a series of algorithms that are used to assess the threat of stress-corrosion cracking.
SCCDA and Modeling Services
The Mears SCC Model consists of a series of algorithms that are used to assess the likelihood of stress-corrosion cracking. The results of the algorithms are used to prioritize segments of pipeline for examination, engineering critical assessment and the development and implementation of repairs and mitigation strategies. The Model is designed to be applied to both forms of external SCC (near-neutral-pH SCC and high-pH SCC).
Approach
The approach followed for the implementation of the SCCDA Model is based on the guidance for SCC Threat Assessment provided in ASME B31.8S, NACE Standard RP0204-2008 Stress Corrosion Cracking (SCC) Direct Assessment Methodology, STP-PT-011 Integrity Management of Stress Corrosion Cracking in Gas Pipeline High Consequence Areas (results of the JIP group), and the Mears SCCDA Procedure. It provides the following:
- Determination of the existence of an SCC threat and susceptibility to future SCC.
- Review of all pertinent Background Data.
- Probability based modeling to determine the most likely areas for SCC and subsequent direct examination.
The Model is designed to be applied to both forms of external SCC (near-neutral-pH SCC and high-pH SCC).
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