Incident details
Operator, cause, commodity and consequences with raw source fields.
HL incident on 2024-07-03 — OK
Operator
Williams Oil Gathering, Llc
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
2024-07-03 00:00 UTC
Report number
Location
OK
Narrative
On june 5th, 2024, williams oil gathering was conducting dewatering/oil filling of the whale oil export pipeline segment number 20556 (row ocs-g29496). During the seawater discharge portion of the operation, the rov feed captured what was assumed to be an oily water mix dissipating upward from the water discharge point (ac-730 plet). As soon as this anomaly was noticed, all flow on the pipeline ceased and at 21:35 no signs of discharge remained visible from the rov. The flow rate at the time of the assumed oily water discharge was approximately 6.94 bbl/minute, the discharge lasted from 21:05 to 21:16 placing the discharge total at approximately 76.34 bbls of assumed oily water (an undetermined combination of seawater, mono ethylene glycol, and crude). Assumed volume of crude oil is 7.71 bbls of the total released assumed oily water.
Detailed record list
Report Received Date
2024-07-03 00:00:00
Iyear
2024
Report Number
20240160
Supplemental Number
40547
Report Type
Supplemental Final
Operator Id
32091
Name
Williams Oil Gathering, Llc
Operator Street Address
One Williams Center, Md Wrc3-4 P.o. Box 645
Operator City Name
Tulsa
Operator State Abbreviation
OK
Operator Postal Code
74172
Time Zone
Central
Daylight Savings Ind
Yes
Location Latitude
26.358361
Location Longitude
-94.5165
Commodity Released Type
Refined And/or Petroleum Product (Non-Hvl) Which Is A Liquid At Ambient Conditions
Commodity Subtype
Other
Commodity Details
Assumed Crude Portion Of Oily Water Mix
Unintentional Release Bbls
7.71
Recovered Bbls
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Accident Identifier
Local Operating Personnel, Including Contractors
Operator Type
Operator Employee
System Part Involved
Offshore Pipeline, Including Riser And Riser Bend
On Off Shore
Offshore
Status When Identified
Post-Construction Commissioning
Communication State Fed Ind
Yes
Party Initiated Communication
Operator
Nrc Rpt Num
1401010
Additional Nrc Report Numbers
1401190
Ignite Ind
No
Upstream Action Taken
Valve Closure
Upstream Valve Type Ind
Manual
Downstream Action Taken
Valve Closure
Downstream Valve Type Ind
Manual
Num Pub Evacuated
0
Pipe Fac Name
Whale 18-In Oil Export Pipeline
Segment Name
20556 (Row Ocs-G29496)
Off Water Depth
8600
Off Accident Origin
On The Outer Continental Shelf (Ocs)
Ocs Type
Ocs-Gulf Of Mexico
Off Ocs Area
Alaminos Canyon
Off Ocs Block
730
Off Area Accident Type
Below Water, Pipe On Or Above Seabed
Pipe Facility Type
Interstate
Item Involved
Other
Item Involved Details
Pig Trail, 3 Pigs
Installation Year
2023
Manufactured Year
2023
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
Unintended Bypass Of Seawater, Meg, And 34.6 Api Gravity Oil Mix From The Perdido Field, In The Dewatering Pig Train (3 Pigs)
Wildlife Impact Ind
No
Soil Contamination
No
Long Term Assessment
No
Remediation Ind
No
Water Contam Ind
Yes
Ocean Seawater Ind
Yes
Surface Contam Ind
Yes
Amount Released
7.71
Rel Water Name
Gulf Of Mexico
Could Be Hca
No
Commodity Reached Hca
No
Est Cost Oper Paid
0
Est Cost Gas Released
0
Est Cost Prop Damage
0
Est Cost Emergency
0
Est Cost Environmental
0
Est Cost Other
1500000
Est Cost Other Details
Vessel Day Rate: Cleaning, Equipment Rent, Pm, & Personnel For Offshore Support
Prpty
1500000
Num Persons Hosp Not Ovnght
0
Num Injured Treated By Emt
0
Num Resident Building Affctd
0
Num Business Building Affctd
0
Accident Psig
560
Mop Psig
3705
Mop Cfr Section
Component Design Pressure �195.406(A)(2)
Maop Established Date
2024-05-14 00:00:00
Maop Reversal Flow Ind
No
Accident Pressure
Pressure Did Not Exceed Mop
Pressure Restriction Ind
Yes
Exceed Restriction Ind
No
Phmsa Restriction Ind
Not Mandated
Length Segment Isolated
40
Internal Inspection Ind
Yes
Operation Complications Ind
No
Pipeline Function
< 20% Smys Regulated Transmission
Scada In Place Ind
No
Cpm In Place Ind
No
Investigation Status
No, the operator did not find that an investigation of the controller(s) actions or control room issues was necessary due to: (provide an explanation for why the operator did not investigate)
Investigation Status Details
Operations were done as per planned procedure in terms of flow control, the unintended by-pass of the meg, seawater, and crude oil across the pigs was the result of the discharge not the operations of the work or control of the same.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Incorrect Operation
Cause Details
Other Incorrect Operation
Operation Type
Other Incorrect Operation
Operation Details
Unintended Bypass Of Meg, Seawater, And Crude Oil In The Dewatering Pig Train (3 Pigs)
Related Other Ind
Yes
Operation Related Details
Loss Of Seal With Pipe Internal Diameter
Category Type
Commissioning
Operator Qualification Ind
No
Preparer Name
S*** R***
Preparer Title
Pipeline Safety Engineer
Preparer Email
S********@w*******.com
Preparer Telephone
7134492720
Prepared Date
2025-02-25 00:00:00
Local Contact Name
J** G*****
Local Contact Email
J*********@w*******.com
Local Contact Telephone
9794764900
Authorizer Name
E*** W****
Authorizer Telephone
2815369504
Authorizer Title
Pipeline Safety Manager
Authorizer Email
E*********@w*******.com
Narrative
On june 5th, 2024, williams oil gathering was conducting dewatering/oil filling of the whale oil export pipeline segment number 20556 (row ocs-g29496). During the seawater discharge portion of the operation, the rov feed captured what was assumed to be an oily water mix dissipating upward from the water discharge point (ac-730 plet). As soon as this anomaly was noticed, all flow on the pipeline ceased and at 21:35 no signs of discharge remained visible from the rov. The flow rate at the time of the assumed oily water discharge was approximately 6.94 bbl/minute, the discharge lasted from 21:05 to 21:16 placing the discharge total at approximately 76.34 bbls of assumed oily water (an undetermined combination of seawater, mono ethylene glycol, and crude). Assumed volume of crude oil is 7.71 bbls of the total released assumed oily water.
| Report Received Date | 2024-07-03 00:00:00 |
|---|---|
| Iyear | 2024 |
| Report Number | 20240160 |
| Supplemental Number | 40547 |
| Report Type | Supplemental Final |
| Operator Id | 32091 PHMSA Enforcement |
| Name | Williams Oil Gathering, Llc |
| Operator Street Address | One Williams Center, Md Wrc3-4 P.o. Box 645 |
| Operator City Name | Tulsa |
| Operator State Abbreviation | OK |
| Operator Postal Code | 74172 |
| Time Zone | Central |
| Daylight Savings Ind | Yes |
| Location Latitude | 26.358361 Google Maps OpenStreetMap |
| Location Longitude | -94.5165 Google Maps OpenStreetMap |
| Commodity Released Type | Refined And/or Petroleum Product (Non-Hvl) Which Is A Liquid At Ambient Conditions |
| Commodity Subtype | Other |
| Commodity Details | Assumed Crude Portion Of Oily Water Mix |
| Unintentional Release Bbls | 7.71 |
| Recovered Bbls | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Accident Identifier | Local Operating Personnel, Including Contractors |
| Operator Type | Operator Employee |
| System Part Involved | Offshore Pipeline, Including Riser And Riser Bend |
| On Off Shore | Offshore |
| Status When Identified | Post-Construction Commissioning |
| Communication State Fed Ind | Yes |
| Party Initiated Communication | Operator |
| Nrc Rpt Num | 1401010 NRC Report How to search |
| Additional Nrc Report Numbers | 1401190 |
| Ignite Ind | No |
| Upstream Action Taken | Valve Closure |
| Upstream Valve Type Ind | Manual |
| Downstream Action Taken | Valve Closure |
| Downstream Valve Type Ind | Manual |
| Num Pub Evacuated | 0 |
| Pipe Fac Name | Whale 18-In Oil Export Pipeline |
| Segment Name | 20556 (Row Ocs-G29496) |
| Off Water Depth | 8600 |
| Off Accident Origin | On The Outer Continental Shelf (Ocs) |
| Ocs Type | Ocs-Gulf Of Mexico |
| Off Ocs Area | Alaminos Canyon |
| Off Ocs Block | 730 |
| Off Area Accident Type | Below Water, Pipe On Or Above Seabed |
| Pipe Facility Type | Interstate |
| Item Involved | Other |
| Item Involved Details | Pig Trail, 3 Pigs |
| Installation Year | 2023 |
| Manufactured Year | 2023 |
| Material Involved | Carbon Steel |
| Release Type | Other |
| Release Type Details | Unintended Bypass Of Seawater, Meg, And 34.6 Api Gravity Oil Mix From The Perdido Field, In The Dewatering Pig Train (3 Pigs) |
| Wildlife Impact Ind | No |
| Soil Contamination | No |
| Long Term Assessment | No |
| Remediation Ind | No |
| Water Contam Ind | Yes |
| Ocean Seawater Ind | Yes |
| Surface Contam Ind | Yes |
| Amount Released | 7.71 |
| Rel Water Name | Gulf Of Mexico |
| Could Be Hca | No |
| Commodity Reached Hca | No |
| Est Cost Oper Paid | 0 |
| Est Cost Gas Released | 0 |
| Est Cost Prop Damage | 0 |
| Est Cost Emergency | 0 |
| Est Cost Environmental | 0 |
| Est Cost Other | 1500000 |
| Est Cost Other Details | Vessel Day Rate: Cleaning, Equipment Rent, Pm, & Personnel For Offshore Support |
| Prpty | 1500000 |
| Num Persons Hosp Not Ovnght | 0 |
| Num Injured Treated By Emt | 0 |
| Num Resident Building Affctd | 0 |
| Num Business Building Affctd | 0 |
| Accident Psig | 560 |
| Mop Psig | 3705 |
| Mop Cfr Section | Component Design Pressure �195.406(A)(2) View CFR 49 §192 |
| Maop Established Date | 2024-05-14 00:00:00 |
| Maop Reversal Flow Ind | No |
| Accident Pressure | Pressure Did Not Exceed Mop |
| Pressure Restriction Ind | Yes |
| Exceed Restriction Ind | No |
| Phmsa Restriction Ind | Not Mandated |
| Length Segment Isolated | 40 |
| Internal Inspection Ind | Yes |
| Operation Complications Ind | No |
| Pipeline Function | < 20% Smys Regulated Transmission |
| Scada In Place Ind | No |
| Cpm In Place Ind | No |
| Investigation Status | No, the operator did not find that an investigation of the controller(s) actions or control room issues was necessary due to: (provide an explanation for why the operator did not investigate) |
| Investigation Status Details | Operations were done as per planned procedure in terms of flow control, the unintended by-pass of the meg, seawater, and crude oil across the pigs was the result of the discharge not the operations of the work or control of the same. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Incorrect Operation |
| Cause Details | Other Incorrect Operation |
| Operation Type | Other Incorrect Operation |
| Operation Details | Unintended Bypass Of Meg, Seawater, And Crude Oil In The Dewatering Pig Train (3 Pigs) |
| Related Other Ind | Yes |
| Operation Related Details | Loss Of Seal With Pipe Internal Diameter |
| Category Type | Commissioning |
| Operator Qualification Ind | No |
| Preparer Name | S*** R*** |
| Preparer Title | Pipeline Safety Engineer |
| Preparer Email | S********@w*******.com |
| Preparer Telephone | 7134492720 |
| Prepared Date | 2025-02-25 00:00:00 |
| Local Contact Name | J** G***** |
| Local Contact Email | J*********@w*******.com |
| Local Contact Telephone | 9794764900 |
| Authorizer Name | E*** W**** |
| Authorizer Telephone | 2815369504 |
| Authorizer Title | Pipeline Safety Manager |
| Authorizer Email | E*********@w*******.com |
| Narrative | On june 5th, 2024, williams oil gathering was conducting dewatering/oil filling of the whale oil export pipeline segment number 20556 (row ocs-g29496). During the seawater discharge portion of the operation, the rov feed captured what was assumed to be an oily water mix dissipating upward from the water discharge point (ac-730 plet). As soon as this anomaly was noticed, all flow on the pipeline ceased and at 21:35 no signs of discharge remained visible from the rov. The flow rate at the time of the assumed oily water discharge was approximately 6.94 bbl/minute, the discharge lasted from 21:05 to 21:16 placing the discharge total at approximately 76.34 bbls of assumed oily water (an undetermined combination of seawater, mono ethylene glycol, and crude). Assumed volume of crude oil is 7.71 bbls of the total released assumed oily water. |
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