Included below is the maintenance schedule for Southern Natural Gas Company, L.L.C. (“Southern”) for 2019. It is being placed on Southern's electronic bulletin board (EBB) to allow our customers advance notice of scheduled work and to assist our customers in planning their business.
Anticipated impacts are estimates. Actual nominations, market demand, weather and pipeline conditions, etc. will determine if, and through what level, restrictions become necessary. Unless otherwise stated, all scheduled dates represent gas days as defined in the Southern Tariff to mean a period of twenty-four consecutive hours, beginning and ending at 9:00 a.m. (Central Clock Time). Scheduled dates are subject to change. Projects may be added, altered, delayed or cancelled. SNG will provide notice of such additions or changes via EBB Postings. Updates as posted on Southern's EBB should be deemed correct in the event of conflicts between subsequent updates posted on the EBB and dates within this monthly notice.
Please note that at any time maintenance is being performed, IT, secondary firm service and hourly flexibility could be impacted depending on demand downstream of the subject maintenance. Also at times primary firm service could be impacted. This will be noted in the project descriptions below if known in advance or posted on the EBB as we become aware.
Color Key for projects:
Yellow
1. Restrictions are possible
2. With extended duration, restrictions could be necessary from time to time
3. Lower than normal pressures may be experienced
Red
1. Restrictions are probable.
While Southern has highlighted the work it anticipates is most likely to have an impact on customers, we ask that you read the entire posting each month and call Gas Control to discuss any other items of interest or concern.
Please note that we have expanded this report to include all pigging operations for the year.
General Information: Southern will be conducting Compressor Station maintenance throughout the year and some impact to the level of service is possible. Please note the heaviest maintenance periods are normally April through May and September through October. These timeframes are historically the lowest periods of demand on the system.
Southern will also be conducting various pipeline projects on its system throughout the year. The projects include pipeline integrity work (facility modifications and inspections on various sections of the pipeline), expansion work, class location upgrades, all pigging, and other miscellaneous projects.
Unscheduled Maintenance
1. A portion of SNG's South Section 28 line in Segment 340 is out of service due to damage to the line that will need to be replaced. The work has started again in September 2019 and the work is expected to complete in December 2019. This unplanned outage constitutes an event of Force Majeure under Section 8.3 of the General Terms and Conditions of SNG's FERC Gas Tariff until further notice. For more information on the outage and effect on receipt points, please refer to Critical Notice 703716 posted on 9-16-19.
2. Southern has experienced unscheduled unit outages at the Gallion compressor station. As a result of this outage Segment 440 scheduled capacity of 2,283 Mdth/d could be reduced by 25 Mdth/d. Return to service is unknown at this time. We do not anticipate a customer impact, however, if demand increases an impact to Interruptible and Out of Path nominations may become necessary.
3. Southern has experienced an unscheduled unit outage at the Thomaston compressor station. As a result of this outage Segment 490 capacity of 1,663 Mdth/d could be reduced by 46 Mdth/d. Return to service is estimated to be 11-22-19. Depending on system demand, an impact to Interruptible and Out of Path nominations may be impacted.
4. Southern has experienced an unscheduled unit outage at the Enterprise compressor station. As a result of this outage Segment 430 capacity of 2,427 Mdth/d could be reduced by 130 Mdth/d. Return to service is unknown at this time. Depending on system demand, an impact to Interruptible and Out of Path nominations may be impacted.
North System November/December 2019 Maintenance
5. Southern will be conducting maintenance at the Bienville compressor station on 11-20-19. This will require the station to be out of service for 8-12 hours. Producers may experience higher than normal pressures during these operations.
South System November/December 2019 Maintenance
6. Southern will be conducting remediation on the South Main Loop line east of the Ellerslie compressor station beginning 11-21-19 to 11-27-19. Segment 490 capacity of 1,663 Mdth/d could be impacted up to 139 Mdth/d in addition, Segment 530 capacity of 900 Mdth/d could be impacted up to 57 Mdth/d. Based on current nominations, Southern does not anticipate an impact to nominations, however if demand increases an impact to IT and Out of Path nominations could become necessary.
7. Southern is conducting station upgrades at our Gwinville compressor station in Jefferson Davis County, Mississippi from 10-8-19 to 11-20-19.
Posted Segment 410 capacity of 1,658 Mdth/d could be reduced as much as 270 Mdth/d until November 1st.
Starting 11-1-19 Segment 410 capacity of 1,802 Mdth/d could be reduced as much as 414 Mdth/d.
While SNG does not anticipate an impact to customers, depending on system demand, IT and Out of Path services could be impacted.
South Louisiana November/December 2019 Maintenance
Nothing to report
General Information
Monthly postings and associated con calls/WebEx will be conducted monthly from February thru November during the year to inform shippers/operators of scheduled work for the following months. Typically, the monthly WebEx is the 3rd Wednesday of the month at 1:30 p.m. CCT, but it will be posted in advance. Southern will post updates on the critical notices bulletin board anytime there are significant changes to timing and/or service impacts of these projects.
If you have any questions, call Kal Dankovich at (713) 420-7522, Jimmy Reese (713) 420-7310, Daniel Mitchell (713) 420-5874, or Reese Hart (713) 420-4774.