The International Association of Oil and Gas Producers (IOGP) has published a safety alert regarding an incident in which a corrosion coupon plug was ejected from a pressurised pipeline. The incident occurred during a ‘routine’ plug retrieval operation on a 28″ crude oil pipeline. The plug was ejected at high velocity from a 2″ access fitting on the pipeline. The pipeline was pressurised to 103 bar. There was a spillage of crude oil from the pipeline via the access fitting. There were no injuries.
Investigation revealed that the most likely cause was that the threads of the access fitting were worn down and unable to restrain the plug against 103 bar of pressure. The access fitting was nearly thirty years old and had been subject to over 140 coupon retrieval and installation cycles.
Further information is available at safetyzone.iogp.org/SafetyAlerts/alerts/Detail.asp?alert_id=273
The following two incidents, relating not to stored pressure release or to pipelines, but to worn-out threads, may be of interest to members:
IMCA Safety Flashes summarise key safety matters and incidents, allowing lessons to be more easily learnt for the benefit of all. The effectiveness of the IMCA Safety Flash system depends on Members sharing information and so avoiding repeat incidents. Please consider adding [email protected] to your internal distribution list for safety alerts or manually submitting information on incidents you consider may be relevant. All information is anonymised or sanitised, as appropriate.
IMCA’s store terms and conditions (https://www.imca-int.com/legal-notices/terms/) apply to all downloads from IMCA’s website, including this document.
IMCA makes every effort to ensure the accuracy and reliability of the data contained in the documents it publishes, but IMCA shall not be liable for any guidance and/or recommendation and/or statement herein contained. The information contained in this document does not fulfil or replace any individual’s or Member's legal, regulatory or other duties or obligations in respect of their operations. Individuals and Members remain solely responsible for the safe, lawful and proper conduct of their operations.