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ONEOK NGL PIPELINE, LLC

hazardous_liquid Incident —

Incident Information

Report Date—
OperatorONEOK NGL PIPELINE, LLC
Commodity—
Pipeline Typehazardous_liquid

Location

State
Coordinates32.80816, -97.66014

Cause

CauseEQUIPMENT FAILURE
Subcause—

Casualties

Fatalities0
Injuries0

Costs

Property Damage—
Lost Commodity—
Public/Private Damage—
Emergency Response—
Environmental Remediation—
Other Costs—

Location Map

Incident Narrative

FILTER VESSEL MAINTENANCE WAS PERFORMED ONEOK'S SILVER CREEK INJECTION SITE AND THE FILTER VESSEL BROUGHT BACK ONLINE ON JULY 6TH 2018. ON JULY 9TH AT APPROXIMATELY 13:15 ONEOK CONTRACTORS WORKING AT THE SITE NOTICED AN ICE BALL ON THE FILTER VESSEL DOOR AND CONTACTED THE LOCAL ONEOK PIPELINE OPERATOR. OPERATIONS PERSONNEL ARRIVED ON SCENE AT APPROXIMATELY 13:48 AND ISOLATED THE FILTER VESSEL. PRODUCT IN THE VESSEL AND ASSOCIATED PIPING WAS THEN FLARED DOWN. PRIOR TO OPENING THE VESSEL, NITROGEN WAS USED TO PURGE THE VESSEL OF ALL COMBUSTIBLES. ON 11 JULY, A MAINTENANCE CREW STEAMED THE VESSEL, REMOVED AND REPLACED THE FILTER ELEMENTS, AND INVESTIGATED THE VESSEL TO DETERMINE A CAUSE OF THE RELEASE. THE SEALING ELEMENT SHOWED SIGNS OF TEARING AT THE 11 O'CLOCK POSITION, WHICH WAS DETERMINED TO BE THE CAUSE OF THE RELEASE. A REPRESENTATIVE OF THE VENDOR OF THE SEALING ELEMENT, USED ON THE VESSEL DOOR, WAS ON SITE DURING THE INVESTIGATION AND WITNESSED THE INSTALLATION OF A NEW SEALING ELEMENT. THE VESSEL WAS THEN RETURNED TO SERVICE. INITIAL COMMUNICATION FROM THE OEM REPRESENTATIVE INDICATED THE SEALING ELEMENT HAD NOT BEEN INSTALLED IN THE CORRECT POSITION. THE OEM REPRESENTATIVE STATED THE OPERATOR MUST VERIFY THE SEAL GLAND IS SMOOTH AND USE APPROPRIATE AMOUNTS OF LITHIUM GREASE SO THE SEALING ELEMENT IS ABLE MOVE INTO THE PROPER OPERATING POSITION DURING INSTALLATION. AS A RESULT OF A SUBSEQUENT REPORTABLE ACCIDENT (7/13/2018) AND ADDITIONAL CONSULTATION WITH THE OEM, THE OEM DETERMINED THE CLOSURE LIDS MANUFACTURED PRIOR TO 2009 WERE DESIGNED FOR A TWO PIECE SEALING ELEMENT WHICH HAS BEEN DISCONTINUED. IN SOME CASES THESE OLDER CLOSURES COULD NOT SUCCESSFULLY USE THE NEWER OEM RECOMMENDED ONE PIECE SEAL DESIGN DUE TO THE TOLERANCE RANGE OF THE CLOSURE LID DURING THE INITIAL MILLING. THE OEM IS CURRENTLY IN THE PROCESS OF RE-ACTIVATING PRODUCTION OF THE ORIGINAL TWO PIECE SEALING ELEMENT DESIGN FOR OPERATORS WITH CLOSURE LIDS MADE PRIOR TO THE DESIGN CHANGE IN 2009. 18/08/08 - UPDATED PART C QUESTION 1 - PIPELINE IS INTERSTATE PER NPMS AND ANNUAL REPORT. NJONES

About This Pipeline Incident

Pipeline incident data is reported to the Pipeline and Hazardous Materials Safety Administration (PHMSA). All significant incidents involving fatalities, injuries, or property damage over $50,000 must be reported.

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