The September 2003 OPS advisory bulletin requires all oil and gas pipeline operators to validate the existence, and non-existence, of stress corrosion-cracking (SCC) in susceptible lines. Under this advisory, operators must demonstrate whether their pipelines are susceptible to SCC, validate the threat of SCC, and assess the potential impact on pipeline integrity. The assessment options available to operators to validate SCC are hydrotesting, direct assessment (SCCDA), and in-line inspection.
GE’s three-phase SCCScreen process, which adopts selected aspects of both in-line inspection and direct assessment, offers pipeline operators a more cost effective assessment than any of the standard available methods, while reliably assuring safety. This innovative screening process is designed to help operators comply with government regulations with minimal costs, while providing assured, validated safety levels.
For liquid pipelines, GE’s SCC screening method uses the UltraScan crack detection (USCD) tool with tailored screening analysis. The process for gas pipelines includes a combination of MagneScan (MFL) and TranScan (TFI) runs analysed with proprietary criteria, improving the identification of SCC fields in susceptible pipelines.
GE Energy is based in Atlanta, Georgia, USA. www.gepower.com"