What are the acceptable integrity assessment methods for ERW pipe or lap welded pipe susceptible to seam failure?
For ERW pipe or lap welded pipe susceptible to seam failures, an operator must: run an in-line inspection device(s) capable of detecting seam flaws, metal loss corrosion, and deformation anomalies, OR perform a Subpart E hydrostatic test. In addition, as part of an effective integrity management program, PHMSA Pipeline Safety expects operators to determine and apply the most appropriate integrity assessment method or methods to address the specific integrity concerns of each pipe segment that can affect an HCA. PHMSA Pipeline Safety will review operator integrity management programs to be sure the operator selects an appropriate method(s) for addressing the integrity concerns of ERW and lap welded pipe. Thus, if seam issues are a particular concern, PHMSA Pipeline Safety believes operators electing pressure testing as an integrity assessment method should consider the value of supplementing a subpart E test with a spike test. For operators selecting hydrostatic testing as an integrity
