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Valero (26003), Norco

Releases in 2006

LDEQ Accident Number
Accident Date
Point Source/Release CauseNotes
92855

2006-12-27
Point Source(s):
Coker unit

Pollutant(s):
Sulfur Dioxide - 2,280 pounds
Cause of Problem: Other

Process safety valve associated with the wet gas compressor in the Coker Unit lifted and diverted gas to the refinery flare system Reason that process safety valve lifted is Under Investigation.
SO2 released from flares and dispersed. Emissions were minimized by first isolating the PSV and then resealing it.
92784

2006-12-20
Point Source(s):
Transformer T-2, millisecond catalytic cracking unit

Pollutant(s):
Sulfur Dioxide - BRQ
Cause of Problem: Equipment Failure

Transformer T-2, which supplies 480 volt power to certain pieces of equipment in the millisecond catalytic cracking unit (MSCCU), had an internal short circuit. This in turn caused unstable operations in the MSCCU resulting in flaring.
Restored power to the MSCCU and stabilized operations
92308

2006-11-28
Point Source(s):
Thermal oxidizer

Pollutant(s):
Hydrogen Sulfide - BRQ
Cause of Problem: Other

Thermal oxidizer had lost the flame and there was a possibility of Hydrogen Sulfide exceedance. After review, found BRQ.
Letter states that emissions were BRQ.
91842

2006-11-03
Point Source(s):
Thermal oxidizer stack

Pollutant(s):
Hydrogen Sulfide - 629 pounds
Sulfur Dioxide - 1,315 pounds
Cause of Problem: Equipment Failure

Incline mixer for the sulfer recover units' tail gas treating unit malfunctioned. Led to higher Hydrogen Sulfide gas concentrations being send to the TOX causing it to trip. Also, the temperature in the TOX dropped due to both the TOX trip and loss ofheat from the incline mixer. Precise cause of failure is Under Investigation
Restarted the TOX ASAP so that any residual H2S could be combusted. Restarted the TGU as soon as practical to minimize SO2 emissions.
91199

2006-10-06
Point Source(s):
Flare 1, flare 2, thermal oxidizer

Pollutant(s):
Sulfur Dioxide - 0 pounds
Cause of Problem: Under Investigation

Under Investigation
Combustion products were rapidly dispersed. There was no apparent offsite impact from the unit shut down.
No LDEQ Number Available

2006-10-06
Point Source(s):
None Reported
Pollutant(s):
Cause of Problem: Start Up, Shut Down

emissions associated with startup and shutdown of several West Plant sources as a part of a planned outage.
90110

2006-08-20
Point Source(s):
Uninterruptable power supply in East Plant motor control building went out causing electrical system to go into fail safe mode.

Pollutant(s):
Sulfur Dioxide - 0 pounds
Cause of Problem: Equipment Failure

Uninterruptable power supply in East Plant motor control building No. 8 failed and caused the electrical system to go into fail safe mode. Electrical equipment assocaited with boilers shut down resulting in loss of steam pressure throughout the refinery. In turn, other process units shut down. Excess gas from shutting down units was directed to refinery flare system
Restarted critical equipmt as quickly as possible to return to normal operation.
89296

2006-07-17
Point Source(s):
None Reported
Pollutant(s):
Cause of Problem: Maintenance/Procedures

MSCC fractionator overhead receiver started venting to flare as result of the unit being shut down for a mechanical repair to the hot stripper side valve.
Letter states that emissions were BRQ.
89015

2006-07-02
Point Source(s):
Flare 1, flare 2

Pollutant(s):
Sulfur Dioxide - 800 pounds
Cause of Problem: No Information Given

No information given
88169

2006-05-26
Point Source(s):
None Reported
Pollutant(s):
Cause of Problem: Start Up, Shut Down

Starting up units on west plant and there was a chance that some flaring might occur. Start up was without incident.
According to letter,
88153

2006-05-23
Point Source(s):
None Reported
Pollutant(s):
Cause of Problem: Other

see notes. Flange fire in our CCR unit. Quickly extinguished.
Letter states that emissions were BRQ.
88077

2006-05-23
Point Source(s):
None Reported
Pollutant(s):
Cause of Problem: No Information Given

No information given
St. Charles refinery worker notices odor and calls in incident.
87993

2006-05-20
Point Source(s):
Coker flaring (fire)
Coker flaring (SD)
DHT liquid burnoff
GHT flaring (fire)
KHT flaring (fire)
NHT flaring (fire)

Pollutant(s):
Carbon Monoxide - 108 pounds
Nitrogen Oxide - 50 pounds
Particulate Matter - 1 pounds
Volatile Organic Compounds - 19 pounds
Sulfur Dioxide - 4,663 pounds
Hydrogen Sulfide - 12 pounds
Carbon Monoxide - 123 pounds
Nitrogen Oxide - 57 pounds
Particulate Matter - 1 pounds
Volatile Organic Compounds - 22 pounds
Sulfur Dioxide - 1,429 pounds
Hydrogen Sulfide - 4 pounds
Carbon Monoxide - 172 pounds
Nitrogen Oxide - 80 pounds
Particulate Matter - 1 pounds
Volatile Organic Compounds - 31 pounds
Sulfur Dioxide - 2,686 pounds
Hydrogen Sulfide - 7 pounds
Carbon Monoxide - 145 pounds
Nitrogen Oxide - 463 pounds
Particulate Matter - 58 pounds
Volatile Organic Compounds - 6 pounds
Sulfur Dioxide - 705 pounds
Hydrogen Sulfide - 2 pounds
Carbon Monoxide - 38 pounds
Nitrogen Oxide - 18 pounds
Particulate Matter - 0 pounds
Volatile Organic Compounds - 7 pounds
Sulfur Dioxide - 1,954 pounds
Hydrogen Sulfide - 5 pounds
Carbon Monoxide - 30 pounds
Nitrogen Oxide - 14 pounds
Particulate Matter - 0 pounds
Volatile Organic Compounds - 5 pounds
Sulfur Dioxide - 796 pounds
Hydrogen Sulfide - 2 pounds
Carbon Monoxide - 91 pounds
Nitrogen Oxide - 42 pounds
Particulate Matter - 1 pounds
Volatile Organic Compounds - 16 pounds
Sulfur Dioxide - 2,367 pounds
Hydrogen Sulfide - 6 pounds
Cause of Problem: Under Investigation

Emissions were minimized by shutting down the affected units and the fire was extinguished.
87975

2006-05-19
Point Source(s):
Coker wet gas compressor trip from high level in the interstage drum

Pollutant(s):
Sulfur Dioxide - 5,600 pounds
Cause of Problem: Process Upset

Wet gas compressor tripped due to a high level in the suction drum Gas processed by the compressor was directed to the refinery flare system
SO2 released from flares and dispersed. Emissions were minimized by cutting coker charge rates, emptying the liquid level to the interstage drum, and restarting the coker WGC. Flaring of gases stopped upon startup of the coker WGC.
No LDEQ Number Available

2006-05-07
Point Source(s):
Reduced crude exchangers

Pollutant(s):
Sulfur Dioxide - 1,980 pounds
Cause of Problem: Piping or Tubing

Old boulder feed water preheat line was inadvertently lined up to the reduced crude exchangers. Water was carried from the exchangers to the crude columns. As result, the crude column and the overhead accumulators overpressured and vented to the flare.
Locked out and tagged the boiler water feed valves upstream of the reduced crude exchangers. Demolish the old boiler feed water line.
87595

2006-05-02
Point Source(s):
None Reported
Pollutant(s):
Cause of Problem: Seal or Gasket

Primary seal failed, secondary seal was still intact. Odor was reported.
Letter states that emissions were BRQ.
87053

2006-04-07
Point Source(s):
None Reported
Pollutant(s):
Cause of Problem: Piping or Tubing

Millisecond catalytic cracking unit developed a small leak on the reactor inlet line.
Letter states that emissions were BRQ.
86961

2006-04-04
Point Source(s):
None Reported
Pollutant(s):
Cause of Problem: Other

see notes. Experiencing power dips from Entergy due to a fire at another facility.
Letter states that emissions were BRQ.
86848

2006-03-30
Point Source(s):
Vacuum jet tower receiver

Pollutant(s):
Sulfur Dioxide - 1,200 pounds
Cause of Problem: Instrument Failure

Vacuum tower jet receiver pressured up causing the liquid level in the seal legs to backup and create a higher discharge pressure on the vacuum ring pumps. The increased pressure at the jet receiver resulted in the drum PSV lifting to the flare. The increased pressure on the discharge of the ring pumps cause al 3 pumps to trip on high amps. The ring pumps were drained and restarted at which time the flaring stopped. Exact cause of incident unknown.
Emissions were minimized by roperations reducing charge to the unit. The overhead receiver was drained, the ring pumps were de-inventoried to start up level, and the ring pumps were restarted to reestablish the vacuum on the vac tower and stop the flaring of gases.
86947

2006-03-29
Point Source(s):
Millisecond catalytic cracking unit off gas treatment system

Pollutant(s):
Sulfur Dioxide - 3,200 pounds
Cause of Problem: Equipment Failure

Due to a problem with off gas treatment system, the off gas did not meet the specification for feedstock use. Therefore, the gas was diverted to the flare while we corrected the problem with the treatment system By visual observation, they discovered that there was another source of gas in the flare. A process safety valve had lifted on the HP overhead receiver for the off gas system The PSV did not reseat automatically.
Emissions reduced by making adjustments to the MSCCU to reduce the quantity of off gas produced.
No LDEQ Number Available

2006-02-21
Point Source(s):
None Reported
Pollutant(s):
Cause of Problem: Equipment Failure

Off-gas amine treater was encountering problems that led to a flaring event.
Letter states that emissions were BRQ.
85824

2006-02-14
Point Source(s):
None Reported
Pollutant(s):
Cause of Problem: Other

Coker D drum had developed a crack that allowed vapors to be released into the atmosphere.
Letter states that emissions were BRQ.
85406

2006-01-26
Point Source(s):
None Reported
Pollutant(s):
Cause of Problem: Equipment Failure

Wet gas compressor was encountering problems that could possibly lead to a flaring event.
Letter states that emissions were BRQ.
No LDEQ Number Available

2006-01-22
Point Source(s):
None Reported
Pollutant(s):
Cause of Problem: Equipment Failure

Wet gas compressor was encountering problems that could possibly lead to a flaring event.
Letter states that emissions were BRQ.
85294

2006-01-20
Point Source(s):
Uninterrupted power supply system

Pollutant(s):
Sulfur Dioxide - 4,600 pounds
Cause of Problem: Equipment Failure

UPS system failed causing the power at the DCS consoles to be lost. Resulted in flaring of gases at Flares 1 and 2.
Emissions were minimized by reestablishing power to the West Plant DCS consolves and reestablishing normal operation as soon as possible.
85926

2006-01-20
Point Source(s):
None Reported
Pollutant(s):
Cause of Problem: Equipment Failure

Off-gas amine treater was encountering problems that led to a flaring event.
Letter states that emissions were BRQ.
84906

2006-01-02
Point Source(s):
None Reported
Pollutant(s):
Cause of Problem: Equipment Failure

# 2 Debutanizer was encountering problems that may have lead to a flaring event.
Letter states that emissions were BRQ.