{"operation":"document","citation":"PHMSA Report 20170120","title":"NORTHERN NATURAL GAS CO — Gas transmission and gathering — incident on 2017-12-07","source_type":"incident","agency":"Pipeline and Hazardous Materials Safety Administration","status":"historical","official":true,"published_on":"2017-12-12","effective_on":"2017-12-07","summary":"Gas transmission and gathering incident in Not Within a Municipality, SAUK County, WI. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 3396 NATURAL GAS released, $0 reported property damage. Operator-reported incident data submitted to PHMSA, generally within 30 days. Records may be supplemented or corrected and do not represent final agency causal findings. PHMSA trend classification: not significant, not serious.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-incident-ae07fe6957a02f3ffc8f0823.json","markdown":"https://regulus.evalyn.ai/document/phmsa-incident-ae07fe6957a02f3ffc8f0823.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-incident-ae07fe6957a02f3ffc8f0823","source_url":"https://data.transportation.gov/api/views/27nc-rsge/files/2b05c2d8-d14a-4c56-ac1c-7d23a4bc31c8?download=true&filename=Gas%20Transmission%20%26%20Gathering%20Incident%20Data%20-%20January%202010%20to%20present.zip","body":"Gas transmission and gathering incident in Not Within a Municipality, SAUK County, WI. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 3396 NATURAL GAS released, $0 reported property damage. Operator-reported incident data submitted to PHMSA, generally within 30 days. Records may be supplemented or corrected and do not represent final agency causal findings.\n\nReport number: 20170120.\n\nOperator ID: 13750.\n\nReported incident date: 12/7/2017 2:15.\n\nLocation detail: MP 40.75\n\nCause detail: MALFUNCTION OF CONTROL/RELIEF EQUIPMENT\n\nCause detail: ON DECEMBER 7, 2017, AT APPROXIMATELY 0357 HOURS, THE SAUK COUNTY SHERIFF'S OFFICE NOTIFIED THE OPERATIONS COMMUNICATION CENTER THAT A LOUD NOISE WAS OBSERVED AT THE SPRING GREEN COMPRESSOR STATION. OPERATIONS RESPONDED AND FOUND NO ISSUES WITH THE UNIT OR STATION THAT WOULD HAVE CAUSED A HIGH PRESSURE SITUATION. THE RELIEF VALVE IS SET AT 880 PSIG BUT ACTUATED AT 798 PSIG. THE VALVE WAS DISASSEMBLED FOR INSPECTION AND A BUILDUP OF ICE IN THE PILOT WAS DISCOVERED. THE RELIEF VALVE WAS REPAIRED AND PLACED BACK IN SERVICE.\n\nPHMSA trend classification: not significant, not serious.\n\nPHMSA standardized cause: EQUIPMENT FAILURE — MALFUNCTION OF CONTROL/RELIEF EQUIPMENT.\n\nPHMSA indexed costs: $9,621 reported total cost, $9,135.325 in 1984 dollars, $11,216.791 in current-year dollars.\n\nPHMSA trend flags, standardized causes, and indexed costs are analytical fields added to operator-reported incident data. They do not represent final agency causal findings.","truncated":false,"body_characters":1545}