Code Modification Forum Clayton Hotel, Cork Wednesday, 26 September 2018
Agenda (1 of 2) 1. Review of minutes from last meeting 2. Review of Action Items from last meeting 3. GNI Scheduled Maintenance Update – Operational /IT/ Maintenance report on Pipeline between Correcunna and Raheen AGIs 4. Emergency Exercises 2018 5. Intra-day Nomination Patterns and Profiles / Cod Mod Proposal A086-Incentives for Intra-day Balancing 6. Code Modification Proposal A087- Implementing a new framework for Suppliers to contract their payment channels for PPM customers 7. Biogas update including review of 1) Code Modification Proposal A091- Modification of oxygen content levels for Renewable Natural Gas (RNG) injected from RNG Entry Points and, 2) Code Modification Proposal A093-RNG Outline Code Modification 2
Agenda (2 of 3) 8. Code Modification Proposal A095- Adjustment of Daily Shipper Imbalance Charges/ Code Modification Proposal A094 – Changes to Shipper Portfolio Tolerances 9 . Brexit and ROI Gas Market 10. Data Sharing Agreement 11. Shrinkage Gas Report 12. Gas and Electricity Interaction 13. Transparency Data Update 14. Website Feature Update 15. Trading Platform Update- GNI Participation 16. AOB Next Code Modification Forum Meeting 3
1. Review of minutes from last meeting 4
2. Review of Action Items from last meeting 5
Code Modification Forum – Open Actions (Slide 1 of 2) ID Action Responsibility Status Priority Transporter Open High C538 Transporter to continue consultation process surrounding intra-day nomination patterns and profiles C566 Transporter to publish data on regular intervals in relation to IBP System Marginal Prices Transporter Open Medium Open C567 Transporter to carry out development work on its Website to make it more user friendly Transporter Medium for Shipper 6
Code Modification Forum 3. GNI Scheduled Maintenance Update 7
Network Maintenance Update 1. Upstream Operator Maintenance GNI have been advised of the following scheduled Maintenance Upstream of Entry Points: Impact on flows at Planned Timings (Subject Duration Entry/Exit Points Location Nature of Works entry/exit points to change) (days) Affected affected NOTHING TO REPORT 8
2017/ 2018 GNI Proposed Maintenance Days Maintenance Programme Gas Year 2017/2018 Entry Date Duration Commentary Points 1 day Corrib Not required 7th Feb 2018 1 day Inch Not required 1 day Corrib SCADA signal validation testing . Now postponed due to deferment of SEPIL transition date 31 May-1June In-Line Inspection (ILI) run between Inch, Lochcarrig Lodge and Caherlag. Date to be finalised with pigging 9 May 1 day Inch contractor/Odorant tank refill at Inch. Zero flow whilst this takes place. Fuel gas skid connection at Cappagh South. May not affect flow. Now postponed, was scheduled to tie-in with 1 day Corrib maintenance which is now deferred 4th Jul 2018 1 day Inch Not scoped yet 1 day Corrib Not scoped yet 12th Sep 2018 1 day Inch Not scoped yet Note: Dates and maintenance programme may be subject to change 9
2018/ 2019 Maintenance Days Maintenance Programme Gas Year 2018/2019 Date Duration Entry Points Commentary 8th November 2018 1 Inch Deferred in line inspection. Risk to flow during intelligent pigging run 7th March 2019 1 Bellanaboy Station testing, valve check and validations at Cappagh South. 9th May 2019 1 Inch Odourant injection system planned maintenance 4th Jul 2019 1 Moffat Station testing, valve checks and validations at Beattock and Brighouse Bay compressor station 12th Sep 2019 1 Bellanaboy ESD testing at the Corrib Terminal 10
IT Maintenance Update Nature of Works Planned Timings (Subject to change) Duration (days) Systems Affected Nothing to report Please note the above works/timings/duration are subject to change 11
Gas Networks Ireland Repair of Pipeline 07 – Anglesboro Liam Murphy – Regional Operations Manager - South
Background • Following an in-line inspection (ILI) of pipeline PL07, Goatisland to Curraleigh West, by Baker Hughes-GE, a corrosion anomaly of depth 25% of the nominal pipeline wall thickness was identified between the Corracunna and Raheen above ground installations (AGIs). The corrosion was scheduled for excavation and detailed inspection as one of 12 pipeline anomalies in GNI’s ILI verification programme. Upon excavation and inspection, the corrosion anomaly was measured to have a depth of 51% of the local pipeline wall thickness and was found to be interacting with a larger area of general corrosion spanning a girth weld. 13
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Location and Extent of the Defect: • The corrosion pit was discovered at the 4 o’clock position under a field fitted shrink sleeve at a girth weld. It was not located in the girth weld heat affected zone (HAZ) however it was found to be interacting with a larger area of general corrosion which spans the girth weld. Based on the available information, the corroded area is broadly rectangular shaped, area of general corrosion, including a number of pits with a peak metal loss depth of 3.164 mm (51% local wall thickness), axial length 360 mm and circumferential width 400 mm. 16
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Repair Options • The installation of an Epoxy Resin Sleeve • Double Stopple and Bypass • Welded Steel Sleeve 18
Pressure Reduction for Repair • Required Pressure of 23 bar • Isolation of Pipeline 07 to Achieve Reduction • Line Shut in at Raheen AGI and Corracunna AGI • Line Pressure Reduced by demand at Mitchelstown • Pipeline Pressure Reduction Started at 00:01 03/09/18 • Pipeline back in Service 04:30 06/09/18 19
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Laser Scan to determine levels of corrosion 21
Pipeline shot blasted to SA 2.5 22
Shell of Epoxy Resin Sleeve positioned 23
Shell bolted and torqued 24
Ends sealed and shell filled with epoxy 25
Pipeline wrapped and excavation backfilled 26
Code Modification Forum 4. Emergency Exercises 2018 27
NEC Exercise Zeus - 3 rd & 4 th October • Exercise Zeus is the UK Gas Industry’s annual Network Gas Supply Emergency (NGSE) Network Emergency Coordinator (NEC) validation exercise. • Exercise will simulate a high demand day (1 st March 2018) with a scenario set to trigger a NGSE. • Exercise will seek to test communication methods between National Grid’s Network Emergency Management Team (NEMT) and all exercise participants including GNI. • Further Information available at: ‒ https://www.nationalgridgas.com/safety-and-emergencies/network-gas-supply-emergencies- ngse 28
NGEM Exercise - 24 th October • The National Gas Emergency Manager (NGEM) exercise will take place on the 24 th October. • Validation of the Natural Gas Emergency Plan (NGEP); plan available at: ‒ https://www.gasnetworks.ie/corporate/company/our-network/ • Exercise will simulate a high demand day with a scenario set to trigger a natural gas emergency. • Gas Emergency Response Team (GERT) will be convened as part of the exercise (GERT members: DCCAE, CRU, EirGrid, GNI). 29
Code Modification Forum 5. Intra-day Nomination Patterns and Profiles /Code Mod Proposal A086 – Incentives for intra-day Balancing 30
Outline of proposed GNI Modification A086 • Modification Raised by GNI to address concerns that the aggregate system imbalance intra-day is creating operational difficulties. • At times, there are large deviations between the prevailing exit nominations on the system and the prevailing entry nominations. GNI wish to introduce an incentive to encourage more alignment of entry and exit • PROPOSAL: At check points during the gas day (11:00, 17:00, 23:00) a shippers portfolio Nomination Imbalance position will be recorded. • A tolerance will be applied at each point • Worked Example: A shipper has 24 units of Aggregate Exit Nomination at 11:00. ‒ Deemed flow at Exit = (24 units * 6hrs/24hrs) = 6 units ‒ Total Entry Nomination = 4 units ‒ Apply a [10%] tolerance: Adjusted Nomination Imbalance Position Nomination Imbalance Position = (6 * 90 %) – 4 = 1.4 units ‒ The Adjusted Nomination Imbalance Position at the 3 time checks will be added ‒ The total for the day will be multiplied by [SAP] * [x%] 31 ‒ The amounts for each day in a month will be invoiced at month end.
Impact if Code Mod was applied in November 2017 – August 2018 • There was a marked improvement in Shipper Nominations following discussions of the proposed modification at recent code mod forums. The estimated monthly financial impact dropped from € 334k (November) to € 67k (January). • However, during Mid February to June late day nominations (attributable to 3 Shippers) has resulted in almost hourly batches late in the gas day, causing operational difficulties once again for both GNI and National Grid. • July showed an improvement in the behaviour of these 3 Shippers, • August shows a further improvement of shippers 1 & 3. Shipper 2, although having a 3% decrease in July, has a 64% increase on potential costs from July to August. 32
Impact if Code Mod was applied in November 2017 – August 2018 Intraday Imbalance Nov 2017 - August 2018 500000 450000 400000 350000 300000 Euro 250000 200000 150000 100000 50000 0 NOVEMBER DECEMBER JANUARY FEBRUARY MARCH APRIL MAY JUNE JULY AUGUST 33
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