EXXONMOBIL PRODUCTION COMPANY, A DIVISION OF EXXON MOBIL CORPORATION

Incident Narrative

PART H - NARRATIVE DESCRIPTION OF ACCIDENT (SUPPLEMENT TO FORM PHSMA 7000-1) THE DISCHARGE ROV'S (2643A/B/C/D) ON THE CO2 SALES COMPRESSORS A, B, C AND D TRIPPED CLOSED DUE TO PT2682 MALFUNCTION, BLOCKING COMPRESSORS OUTLET RESULTING IN SUDDEN PRESSURE INCREASE. THE CONTROL ROOM CALLED I&E TO INVESTIGATE FAILED PT2682 AND CLOSURE OF DISCHARGE ROV'S. THREE I&E TECHS RESPONDED TO CO2 SALES FOLLOWED BY THE I&E TECH FOREMAN. I&E TECH FOREMAN NOTICED SIGNIFICANT MOVEMENT IN THE DISCHARGE PIPING, DIRECTED THE TEAM TO EVACUATE THE AREA TO THE PDC AND CALLED CONTROL ROOM FOR AN E-STOP. CONTROL ROOM INITIATED CONTROLLED SHUTDOWN OF COMPRESSORS A THROUGH D WHICH WAS COMPLETED. DURING THE EVENT, COMPRESSOR DISCHARGE PIPING AND RECYCLE LINES SHOOK DAMAGING A SUPPORT BEAM ON ""A"" COMPRESSOR DISCHARGE LINE AND BROKE A 3/4 INCH DRAIN VALVE OFF COMPRESSOR ""A"" RECYCLE LINE CAUSING A LOW CO2 ALARM ON FIXED MONITORS. PERSONAL MONITORS NEVER ALARMED. ENHANCEMENTS MADE TO THE CONTROL LOGIC OF PT2682 TO ELIMINATE THE CLOSURE OF VALVES WHEN THE PRESSURE TRANSMITTER FAILS. * PART G, NO. 6 (ADDITIONAL INFORMATION) - PIPE MOVEMENT FROM THE INCREASE PRESSURE IN THE SYSTEM WAS IDENTIFIED; WOULDN'T NECESSARILY CALL THIS VIBRATION FROM UNSUPPORTED PIPE. - THE PIPING WAS SUPPORTED, DUE TO THE INCREASED PRESSURE THE PIPE MOVED.