Pipeline Safety Advisory Bulletin; Inspecting and Testing Pilot-Operated Pressure Relief Valves
This notice announces a pipeline safety advisory bulletin about pilot-operated pressure relief valves installed in hazardous liquid pipelines. The bulletin provides pipeline operators guidance on whether their inspection and test procedures are adequate to determine if these valves function properly. Malfunctioning of a pilot-operated pressure relief valve was a contributing factor in an accident involving a petroleum products pipeline in Bellingham Washington.
Pipeline Safety: Petition for Waiver; BOC Gases
PHMSA is correcting a petition for waiver published in the Federal Register on July 14, 2005 (70 FR 40780). That petition, from BOC Gases (BOC), requested a waiver from the pipeline safety standards at 49 CFR 195.306(c)(5) to allow the use of inert gas or carbon dioxide as the test medium for pressure testing an existing carbon dioxide pipeline. This notice corrects the supplementary information of that publication, which referred to a gas pipeline safety regulation when it should have referred to a hazardous liquid pipeline safety regulation.