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Motiva Enterprises (2719), Convent

Releases of Benzene

LDEQ Accident Number
Accident Date
Point Source(s) Notes Amount of Release

Tank 20D-12
Cause: Floating roof on Tank 20D-12 partially collapsed into the hydrocarbon product during heavy rains, releasing product to ground via the roof drain and into air via evaporation. Exceeded RQs. No LDEQ report in this file--hazmat and two letters.

Followup: Yes

Notes: discontinued product transfers to and from tank and began preparations to remove product from the floating roof and the tank.
855.3 pounds

001 Outfall
Cause: a main wastewater line ruptures following a repair on a small line

Followup: Yes

Notes: Massive process water release (872,000 gallons). Motiva submits lengthy incident report (~50 pp.) a
9.0 pounds

Catalytic Reforming Unit
Cause: A leak on a warm up line to a discharge check valve that released naptha, a gasoline component, directly onto the unit slab.

Followup: No

Notes: The incident was initially reported as a potential exceedance of the 10 pound reportable quantity for benzene. However, after further calculation, the total benzene emissions from this incident were not able reportable quantity.

pump 4G-559
Cause: On August 19, 2013, a fire was experienced on pump 4G-559 due to a seal failure. HTU-1's recycle compressor tripped on high K.O. drum level. A decision was made to slowdown, stabilize, and shutdown. Part of the activities to slowdown included putting the CRU unit on hydrogen circulation; therefore, operations shutdown the CRU charge pumps, 4G-501/559. Shortly after the pumps were stopped, 4G-559 failed, and a seal fire occurred. After thorough investigation, the cause of the seal fire was determined to be the failure of a check valve on the discharge of 4G-559. When the charge pumps were stopped, the downstream hydrogen pushed the naptha in the line backwards through the discharge line. the check valve in the discharge line did not operate as designed and the naptha and hydrogen entered 4G-559 causing it to spin in reverse. This caused friction, heat, and vibration significant enough for the pump to seize. Under these conditions, a seal fire is expected.

Followup: Yes

Notes: The units were brought down in order to stabilize the situation. The materials involved in the fire were largely combusted, as were the materials routed to the flare; they were then dispersed naturally into the air. All residual unburned materials from the pump seal fire were captured by the unit secondary containment system and recycled back into the refinery's recovered oil system. A second check valve has been installed on the discharge line to provide an additional factor of safety against the potential failure of a single check valve.
185.8 pounds

wastewater sewer trench
Cause: On July 10, a release was reported at the Fluidized Catalytic Cracking Unit. The event was caused by a partially opened pump bleeder valve that released Heavy Straight Run (HSR), a gasoline component, directly into a process wastewater sewer drain. The drain overflowed and HSR pooled in an open sewer trench and was subject to evaporation losses to the air.

Followup: No

Notes: No remedial actions given. Incident initially reported as potential exceedance of 10 pound RQ for benzene. After further calculation, the total benzene emissions were not above RQ.