Incident details
Operator, cause, commodity and consequences with raw source fields.
HL incident on 2013-10-14 — TX
Operator
Exxonmobil Oil Corporation-Terminals
Cause
Incorrect Operation
Commodity
Refined And/or Petroleum Product (Non-Hvl) Which Is A Liquid At Ambient Conditions
Program
HL
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$0
Incident datetime
2013-10-14 13:27
Report number
Location
TX
Narrative
The exxonmobil atwood terminal was receiving gasoline/water mixture from m-3 hydrotest into tank 14. Tank level was being monitored by terminal personnel for safe level shut down of 42ft. At 13:20, with the tank level showing ~41, the tank began to overfill out of the three lower tank vents in to secondary containment. Emergency overfill protection did not activate. The incoming pipeline was shut down via emergency shut down and system was isolated at the atwood meter station (valves #1 & #3 and mov #14). Root cause of incident the atwood tank 14 automatic tank gauging system utilizes two pressure transmitters to calculate mass and density and calculates a tank level based on the tank dimensions. Because the pressure transmitters are located at a fixed distance at the bottom of the tank, the system does not have the capability of accurately calculating tank levels when there is stratification of different density liquids such as gasoline and water. This is the direct cause of the inaccurate tank levels that led to the overfilling of the tank.
Detailed record list
Report Received Date
2013-11-13 00:00:00
Iyear
2013
Report Number
20130363
Supplemental Number
23003
Report Type
Supplemental Final
Operator Id
32009
Name
Exxonmobil Oil Corporation-Terminals
Operator Street Address
22777 Springwoods Village Parkway Emhc/e3.5a.385
Operator City Name
Spring
Operator State Abbreviation
TX
Operator Postal Code
77389
Local Datetime
2013-10-14 13:27:00
Location Latitude
33.86657
Location Longitude
-117.838615
Commodity Released Type
Refined And/or Petroleum Product (Non-Hvl) Which Is A Liquid At Ambient Conditions
Commodity Subtype
Gasoline (Non-Ethanol)
Unintentional Release Bbls
133
Recovered Bbls
113
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Accident Identifier
Ground Patrol By Operator Or Its Contractor
Operator Type
Operator Employee
Incident Identified Datetime
2013-10-14 13:27:00
System Part Involved
Onshore Breakout Tank Or Storage Vessel, Including Attached Appurtenances
On Off Shore
Onshore
Shutdown Due Accident Ind
Yes
Shutdown Datetime
2013-10-14 13:27:00
Restart Datetime
2013-10-16 08:00:00
On Site Datetime
2013-10-14 13:40:00
Nrc Rpt Datetime
2013-10-14 14:14:00
Nrc Rpt Num
1062992
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
21
Pipe Fac Name
Atwood Terminal
Segment Name
Atwood Terminal, Orange County, California
Onshore State Abbreviation
Ca
Onshore Postal Code
92807
Onshore City Name
Anaheim
Onshore County Name
Orange
Designated Location
Milepost/valve Station
Designated Name
Tank #14
Federal
No
Location Type
Totally Contained On Operator-Controlled Property
Incident Area Type
Tank, Including Attached Appurtenances
Crossing
No
Pipe Facility Type
Intrastate
Item Involved
Tank/vessel
Tank Vessel Subtype
Other
Tank Vessel Details
Tank Overfill While Moving Test Water
Tank Type
Atmospheric
Installation Year
Unknown
Material Involved
Carbon Steel
Release Type
Overfill Or Overflow
Wildlife Impact Ind
No
Soil Contamination
Yes
Long Term Assessment
Yes
Remediation Ind
Yes
Soil Remed Ind
Yes
Water Contam Ind
No
Could Be Hca
Yes
Commodity Reached Hca
Yes
High Pop Ind
Yes
High Pop Yes No
Yes
Other Pop Ind
Yes
Other Pop Yes No
Yes
Usa Drinking Ind
Yes
Usa Drinking Yes No
Yes
Usa Ecological Ind
Yes
Usa Ecological Yes No
Yes
Est Cost Oper Paid
0
Est Cost Gas Released
18660
Est Cost Prop Damage
0
Est Cost Emergency
30000
Est Cost Environmental
215000
Est Cost Other
0
Est Cost Other Details
Environmental Analysis Ongoing At Site.
Prpty
263660
Accident Psig
15
Mop Psig
15
Accident Pressure
Pressure Did Not Exceed Mop
Pressure Restriction Ind
No
Pipeline Function
> 20% Smys Regulated Transmission
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
No
Scada Conf Ind
No
Cpm In Place Ind
No
Investigation Status
Yes, specify investigation result(s): (select all that apply)
Invest Schedule Ind
Yes
Invest No Control Room Ind
Yes
Invest No Controller Ind
Yes
Employee Drug Test Ind
Yes
Contractor Drug Test Ind
No
Num Employees Tested
1
Num Employees Failed
0
Cause
Incorrect Operation
Cause Details
Tank, Vessel, Or Sump/separator Allowed Or Caused To Overfill Or Overflow
Operation Type
Tank, Vessel, Or Sump/separator Allowed Or Caused To Overfill Or Overflow
Overflow Other Ind
Incorrect Reference Data/calculation
Related Inadequate Proc Ind
Yes
Category Type
Other Maintenance
Operator Qualification Ind
No
Preparer Name
K***** Y****
Preparer Title
Pipeline Safety Advisor
Preparer Email
K*************@e*********.com
Preparer Telephone
225-324-3055
Prepared Date
2017-12-29 00:00:00
Authorizer Name
M*** D* W******
Authorizer Telephone
713-656-0227
Authorizer Title
She Manager
Authorizer Email
M*************@e*********.com
Narrative
The exxonmobil atwood terminal was receiving gasoline/water mixture from m-3 hydrotest into tank 14. Tank level was being monitored by terminal personnel for safe level shut down of 42ft. At 13:20, with the tank level showing ~41, the tank began to overfill out of the three lower tank vents in to secondary containment. Emergency overfill protection did not activate. The incoming pipeline was shut down via emergency shut down and system was isolated at the atwood meter station (valves #1 & #3 and mov #14). Root cause of incident the atwood tank 14 automatic tank gauging system utilizes two pressure transmitters to calculate mass and density and calculates a tank level based on the tank dimensions. Because the pressure transmitters are located at a fixed distance at the bottom of the tank, the system does not have the capability of accurately calculating tank levels when there is stratification of different density liquids such as gasoline and water. This is the direct cause of the inaccurate tank levels that led to the overfilling of the tank.
| Report Received Date | 2013-11-13 00:00:00 |
|---|---|
| Iyear | 2013 |
| Report Number | 20130363 |
| Supplemental Number | 23003 |
| Report Type | Supplemental Final |
| Operator Id | 32009 PHMSA Enforcement |
| Name | Exxonmobil Oil Corporation-Terminals |
| Operator Street Address | 22777 Springwoods Village Parkway Emhc/e3.5a.385 |
| Operator City Name | Spring |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77389 |
| Local Datetime | 2013-10-14 13:27:00 |
| Location Latitude | 33.86657 Google Maps OpenStreetMap |
| Location Longitude | -117.838615 Google Maps OpenStreetMap |
| Commodity Released Type | Refined And/or Petroleum Product (Non-Hvl) Which Is A Liquid At Ambient Conditions |
| Commodity Subtype | Gasoline (Non-Ethanol) |
| Unintentional Release Bbls | 133 |
| Recovered Bbls | 113 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Accident Identifier | Ground Patrol By Operator Or Its Contractor |
| Operator Type | Operator Employee |
| Incident Identified Datetime | 2013-10-14 13:27:00 |
| System Part Involved | Onshore Breakout Tank Or Storage Vessel, Including Attached Appurtenances |
| On Off Shore | Onshore |
| Shutdown Due Accident Ind | Yes |
| Shutdown Datetime | 2013-10-14 13:27:00 |
| Restart Datetime | 2013-10-16 08:00:00 |
| On Site Datetime | 2013-10-14 13:40:00 |
| Nrc Rpt Datetime | 2013-10-14 14:14:00 |
| Nrc Rpt Num | 1062992 NRC Report How to search |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 21 |
| Pipe Fac Name | Atwood Terminal |
| Segment Name | Atwood Terminal, Orange County, California |
| Onshore State Abbreviation | Ca |
| Onshore Postal Code | 92807 |
| Onshore City Name | Anaheim |
| Onshore County Name | Orange |
| Designated Location | Milepost/valve Station |
| Designated Name | Tank #14 |
| Federal | No |
| Location Type | Totally Contained On Operator-Controlled Property |
| Incident Area Type | Tank, Including Attached Appurtenances |
| Crossing | No |
| Pipe Facility Type | Intrastate |
| Item Involved | Tank/vessel |
| Tank Vessel Subtype | Other |
| Tank Vessel Details | Tank Overfill While Moving Test Water |
| Tank Type | Atmospheric |
| Installation Year | Unknown |
| Material Involved | Carbon Steel |
| Release Type | Overfill Or Overflow |
| Wildlife Impact Ind | No |
| Soil Contamination | Yes |
| Long Term Assessment | Yes |
| Remediation Ind | Yes |
| Soil Remed Ind | Yes |
| Water Contam Ind | No |
| Could Be Hca | Yes |
| Commodity Reached Hca | Yes |
| High Pop Ind | Yes |
| High Pop Yes No | Yes |
| Other Pop Ind | Yes |
| Other Pop Yes No | Yes |
| Usa Drinking Ind | Yes |
| Usa Drinking Yes No | Yes |
| Usa Ecological Ind | Yes |
| Usa Ecological Yes No | Yes |
| Est Cost Oper Paid | 0 |
| Est Cost Gas Released | 18660 |
| Est Cost Prop Damage | 0 |
| Est Cost Emergency | 30000 |
| Est Cost Environmental | 215000 |
| Est Cost Other | 0 |
| Est Cost Other Details | Environmental Analysis Ongoing At Site. |
| Prpty | 263660 |
| Accident Psig | 15 |
| Mop Psig | 15 |
| Accident Pressure | Pressure Did Not Exceed Mop |
| Pressure Restriction Ind | No |
| Pipeline Function | > 20% Smys Regulated Transmission |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | No |
| Scada Conf Ind | No |
| Cpm In Place Ind | No |
| Investigation Status | Yes, specify investigation result(s): (select all that apply) |
| Invest Schedule Ind | Yes |
| Invest No Control Room Ind | Yes |
| Invest No Controller Ind | Yes |
| Employee Drug Test Ind | Yes |
| Contractor Drug Test Ind | No |
| Num Employees Tested | 1 |
| Num Employees Failed | 0 |
| Cause | Incorrect Operation |
| Cause Details | Tank, Vessel, Or Sump/separator Allowed Or Caused To Overfill Or Overflow |
| Operation Type | Tank, Vessel, Or Sump/separator Allowed Or Caused To Overfill Or Overflow |
| Overflow Other Ind | Incorrect Reference Data/calculation |
| Related Inadequate Proc Ind | Yes |
| Category Type | Other Maintenance |
| Operator Qualification Ind | No |
| Preparer Name | K***** Y**** |
| Preparer Title | Pipeline Safety Advisor |
| Preparer Email | K*************@e*********.com |
| Preparer Telephone | 225-324-3055 |
| Prepared Date | 2017-12-29 00:00:00 |
| Authorizer Name | M*** D* W****** |
| Authorizer Telephone | 713-656-0227 |
| Authorizer Title | She Manager |
| Authorizer Email | M*************@e*********.com |
| Narrative | The exxonmobil atwood terminal was receiving gasoline/water mixture from m-3 hydrotest into tank 14. Tank level was being monitored by terminal personnel for safe level shut down of 42ft. At 13:20, with the tank level showing ~41, the tank began to overfill out of the three lower tank vents in to secondary containment. Emergency overfill protection did not activate. The incoming pipeline was shut down via emergency shut down and system was isolated at the atwood meter station (valves #1 & #3 and mov #14). Root cause of incident the atwood tank 14 automatic tank gauging system utilizes two pressure transmitters to calculate mass and density and calculates a tank level based on the tank dimensions. Because the pressure transmitters are located at a fixed distance at the bottom of the tank, the system does not have the capability of accurately calculating tank levels when there is stratification of different density liquids such as gasoline and water. This is the direct cause of the inaccurate tank levels that led to the overfilling of the tank. |
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