Stray Current Mitigation & Cathodic Protection Regulation Pipeline Corrosion Management seminar Melbourne 29 June 2017 Peter Wade Manager Electrolysis Mitigation

What is Electrolysis Electrolysis is a term used for corrosion relating to the effects from Stray (DC) Electrical Currents on buries metallic assets The 2 main sources of Stray Electrical Currents are: From Trains and Trams From Cathodic Protection (CP) systems

Electrolysis Mitigation Section Energy Safe Victoria (ESV) has the legislative powers in the State of Victoria to ensure the protection of underground and underwater structures from the corrosive effects of stray electrical currents. In discharging this responsibility, ESV is advised by the Victorian Electrolysis Committee (VEC). The VEC is a government appointed committee consisting of 8 members representing: ESV; Train; Tram; Gas; Water; Telecommunications; Electricity; & Oil industries. (Est. 30 August 1927)

Unique section of ESV Two distinct roles: Customer Service Role: Balance/test/inspect/calibrate the Electrolysis Mitigation systems to protect all underground metallic assets Unbiased/independent adjudicator Regulatory Role (Electricity Safety Act): Ensure Train and Tram operators comply with their obligations to minimise stray currents Ensure CP owners and operators don’t interfere with 3rd party assets

Legislative Framework

Stray Traction Current Corrosion Corrosion Occurs

Electrolysis Drainage System

Anodic – Corrosion occurring Cathodic – Reduced Corrosion Stray Current Effects Anodic – Corrosion occurring Cathodic – Reduced Corrosion

Electrolysis Drainage Bond 880 Electrolysis drainage bonds, inspected each month, with 1,200 connections to individual pipelines/cables Approx. 300km Electrolysis Drainage feeders

Thyristor Drainage Unit (TDU) 87 TDU’s installed within Train and Tram substations, tested and calibrated every month

Tram network

Train network

Electricity Safety Act 1998 - Sect 93 Operation of cathodic protection systems (1) The owner of a cathodic protection system must not operate or allow another person to operate that system unless it is registered by Energy Safe Victoria in accordance with the regulations. (2) The owner of a cathodic protection system must ensure that the system is operated in accordance with— (a) this Act and the regulations; and (b) any conditions to which the registration is subject.

Registered CP systems Numbers of registered systems: Galvanic Anodes = 15,700 Impressed Current Units = 1,300 Total = 17,000 There are 3 fee categories for registration: Current O/P Fee* No. Registered Period <250mA $134.48 14,300 Until withdrawn 250mA – 2A $336.58 2,000 >2A $760.11 700 10 years *Based on government gazetted fee units

Galvanic Anodes

Cathodic Protection systems 1st CP system in Australia -1935 St Georges Rd, Northcote - MMBW pipes

Interference from Impressed Current Cathodic Protection Unit CORROSION OCCURS

ESVConnect

ESV Connect

CP applications Demo Purposes only

CP Application

CP Application Review Ability to: Pre-populate information from your User Profile Copy previous applications Save and complete later Mandatory fields and attachments so you don’t forget to include important information All on your mobile device

Consultations Report Important to consult with all 3rd party structure owners (Affected Parties) to see whether they have objections to your installation Testing for interference may be required prior to gaining registration approval The Code of Practice recommends 20 working days notice for them to respond Unless this is complied with your application could be delayed

Certificate of Registration 1 CoR each for Owner, Contractor, & ESV File

Manage your CP systems Status of current applications Links to other interactions with ESV Overview of your registered systems Highlights when renewal is required

Manage your CP systems Ability to: Renew; Change; Cancel; & Print Certificates Notify Date of Operation

CP Regulations Revision due 2019 Opportunity to re-define what a “Prescribed Systems” is What should be exempt? Is a Provision for testing always required? Contact ESV with any suggested changes Respond to the RIS

Gas & Pipeline Infrastructure Safety section Are responsible for regulating natural gas transmission, non-natural gas and liquid hydrocarbon pipelines, the Australian Energy Market Operator (AEMO), natural and LP gas distribution networks, landfill gas, biogas, LNG, natural gas and LPG retailers.

Safety Case & Safety Management Plans Integrity Management is the main game AS 2885.3 (2012) sets the rules for Operation & Maintenance The key is a Safety Case/Safety Management Plan which: Complies with Gas Safety Act (1997), Pipelines Act (2005) and AS2885.3 (2012) Covers the risks to pipeline integrity Describes how risks are controlled Ensures controls are effective & consistent Is audited to ensure compliance and effectiveness Is complied with.

Inspection Inspection, assessment and monitoring are critical processes to pipeline management, if there’s no inspection then you don’t know what you don’t know.

Intelligent Pigging Intelligent pigging and coating surveys are 2 methods used to inspect the pipelines which have measurement uncertainty. Therefore verification digs on these results, with a direct inspection method, is an important part of the inspection process. The verification digs should also be addressed in the Pipeline Integrity Management Plan.

Integrity Inspections For pipelines which cannot be intelligently pigged, just using coating surveys for inspection is not a comprehensive anomaly / defect identification process. The inspection process needs to be suitable for the risks associated with that pipeline. Consideration also needs to be given to environmental conditions the coating survey is conducted in. If the threat of CP shielding is credible to that pipeline, this should also be addressed.

Electrolysis Testing

Drainage Bond testing

Electrolysis Drainage Bond

Contact: peter.wade@energysafe.vic.gov.au Questions For more information: http://www.esv.vic.gov.au/technical-information/electrolysis-mitigation-and-cathodic-protection/ Contact: peter.wade@energysafe.vic.gov.au