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Motiva Enterprises (1406), Norco

LDEQ Accident Report

Accident #153484
State Police #14-00388
Accident Date2014-01-23
Report Date 2014-01-30
Follow-up Date 0000-00-00
Follow-up: No

Pollutants Released

Pollutant Duration Point Source Greenhouse Gas Criteria Pollutant Ozone forming chemical Amount of Release
Isobutane2 h 33 mElevated Flare (FE-201)NONOYES 
n-Butane2 h 33 mElevated Flare (FE-201)NONONO 
Propane2 h 33 mElevated Flare (FE-201)NONOYES 
Propylene2 h 33 mElevated Flare (FE-201)NONOYES 
Isobutylene2 h 33 mElevated Flare (FE-201)NONOYES 

Accident Classified As: No Information Given

Cause of Problem: Equipment Failure

Motiva's RCCU Unit had a relief Valve (RV) on its Debutanizer Column lift and relieve to atmosphere. The RV lifted as its designed pressure setting after a pressure transmitter failed in the unit causing a pressure control valve to fail into closed position. Once this valve did not move to open position, the pressure within the Debutanizer Column built up and over pressured causing the RV to relieve as designed. To help relieve the pressure in the debutanizer column and to stop the RV from relieving the material was routed to the flare. Isobutane, Isobutene, N-Butane, Propane, and Propylene were potentially released from Motiva's Residual Catalytic Cracking Unit's (RCCU) Elevated Flare (FE-201).

Discharge Preventable - Under Investigation

Notes/Remedial Actions

Data gathering to perform calculations and investigation are ongoing. Shell will provide and update within 60 days as required by LAC 33:1:3925.A.3.