Cathodic Protection Session 2
17 August, Wednesday - Kedah Room - 1:30pm - 3:15pm

Chair : Anand Kulkarni, Corrosion Control Services (B) Pvt. Ltd.

Cathodic Protection Retrofit of Aged Underground Pipelines

17 August, Wednesday - Kedah Room - 1:35pm - 2:05pm

Bio of Speaker


Full Name :  Tennya Kua Yen Fong
Title / Position :  Reliability (Strategy) Engineer
Company name :  ExxonMobil Asia Pacific Pte. Ltd. 

Tennya Kua is a Strategy Engineer at Jurong Refinery, ExxonMobil Asia Pacific Pte. Ltd. She joined the company in 2011 after completing her B.Eng (Honours) Mechanical at Nanyang Technological University, Singapore. She is involved in areas of materials, corrosion and inspection of Offsites fixed equipment such as atmospheric storage tanks and process piping. Her present role is in the development of Risk Based Inspection programs to optimize inspection, repair and maintenance strategies whilst meeting safety, environmental and reliability requirements. She has been actively involved in areas of pipeline integrity such as intelligent pigging and leak detection (among other initiatives), and has led efforts for the application of Best Practices for pipelines in the public domain. During this time, Tennya has also been managing and improving the integrity of cathodic protection systems in the Refinery by reviewing maintenance records, troubleshooting repairs and upgrading CP systems. She attained her NACE CP 1 and CP 2 qualifications in 2014 and 2015 respectively.
Corrosion is a leading cause of pipeline failures. Cathodic protection (CP) is a method for external corrosion protection of buried or submerged pipelines, and is achieved through galvanic anode or impressed current type systems. Impressed current CP systems can be designed using a deepwell groundbed anode or distributed anodes. For a long length of buried pipeline with an existing galvanic anode CP system that has exceeded its lifespan and is deficient, installation of a deepwell impressed current CP system to replace it can be more physically and/or cost attractive than excavation for the replacement of the sacrificial anodes along its entire length. Retrofitting buried pipelines across shorter length of road crossings with a CP system has to be assessed for effectiveness and possible limitations. One possible limitation is buried pipelines without insulating flanges for isolation from the aboveground sections. To protect these relatively short sections, distributed anodes are placed parallel and near to the pipelines. These anodes are then connected to a transformer rectifier to produce sufficient localized cathodic protection current. This paper will provide some examples of the abovementioned retrofitting installations done for buried pipelines and their effectiveness.

Case of Challenges in Optimizing Cathodic Protection in High and Low Temperature Environment

17 August, Wednesday - Kedah Room - 2:10pm - 2:40pm

Bio of Speaker


Name:  Bob Phang P. Ping
Title / Position:  Principal Eng. Technical Director 
Company:  Best Wide Corrosion Tech S/B

Bob Phang has over 30 years experience as a professional engineer graduated from Monash University Australia in 1982 with a Bachelor’s Degree in Materials Engineering and later undertook R & D in the Corrosion of Steel Reinforced Concrete Matrix in Marine Environment in a Masters program with the University in 1991. 
He has executed projects and designs involving new petrochemical and processing plants for Oil & Gas, FEED, Rejuvenation & Revamping existing refineries, EPCC central processing plants with innovative and cost effective Corrosion Control Systems,  Asset Integrity Management Audit Surveys and Cathodic Protection System designs.
Protection of infrastructure is key success contribution to any country, locally and internationally. Onshore Oil Tanks, gathering lines, production lines, deepwell casings, production pipes, satellite stations, field gathering, underground LPG bullet tanks, including Offshore Platforms and FSO / FPSO facilities. Projects outside of Malaysia include Australia, Turkmenistan, Vietnam, Myanmar ,Thailand, Brunei, Singapore, Sudan, Saudi Arabia, Egypt - to name a few.   
Bob is a certified NACE International Corrosion Specialist, CP Instructor involved in  training young engineers worldwide and sharing technical knowledge and experiences through technical publications, symposiums and conferences.
He is currently the NACE Malaysia Trustee and has served in capacity of Vice Chair, Chair and NACE International’s Director for the East Asian & Pacific Region for 2004 – 2008
He is Principal Engineer and Technical  Director of Best Wide Corrosion Tech S/B​​
This paper discusses the challenges faced in an installation far north of the Tropic of Cancer just below the Arctic Circle.
The onset of cold arctic conditions and desert temperatures auger into the Gas Plant and the infrastructure that supports the operations from Import pipelines, process facilities and export sales pipelines from the Caspian sea to the hinterland interiors of land locked countries. In the several years that included materials selection, construction, commissioning and later operations have provided a base line of unexpected challenges from buried structures, foundations to above ground infrastructures.
In mitigating the commissioned status of the plant and buried pipelines, this case study involves design parameters for several sets of pipelines, coating requirements, onshore and offshore monitoring of the assets involving corrosion retardation and onshore cathodic protection systems, erosion, vandalism and unwarranted interference.
Results of the various inspection techniques on the buried structures, in line monitoring, external corrosion controls and evaluation of the surveyed results will be discussed along with the limitations by very high and very low temperatures are presented.
Lessons learnt are most interesting in this part of the world when prehistoric sites where craters formed by crashed meteorites are prevalent.


17 August, Wednesday - Kedah Room - 2:45pm - 3:15pm

Bio of Speaker


Name: Goh Toke Aik (Bryan)
Title / Position:  Corrosion Engineer
Company:  Best Wide Corrosion Tech. Sdn. Bhd.

Bryan Goh Toke Aik hails from Kuala Lumpur, Malaysia. He received his Advanced Diploma and Diploma in Materials and Manufacturing Engineering from Tunku Abdul Rahman College (TARC) M’sia.
In 2008, he received his B.Eng (Hons) in Materials and Manufacturing Engineering from Sheffield Hallam University (SHU), United Kingdom.
Presently, he is with Best Wide Corrosion Tech. Sdn. Bhd. and performed a numerous of offshore, onshore and MOPU projects over the past 3 years. Cathodic protection designs implementation and performance of every successful project is being supervised by Mr. Bob Phang, NACE Corrosion Specialist where key works include asset monitoring, supervision for Impressed Current Cathodic Protection (ICCP) and Sacrificial Anode Cathodic Protection (SACP) surveys and operations.
His other experiences include 2 coat painting systems, 3 coat painting systems, Thermal Spray Aluminium (TSA) coating, Thermal Spray Zinc (TSZ) coating, Aluminium and Zinc anode manufacturing and some corrosion prevention products.
Certification Courses and Professional Association:
Cathodic Protection Technician – CP2
Cathodic Protection Tester – CP1
BGAS-CSWIP Painting Inspector – Grade 2
An investigation has been performed to find the root cause of the coating anomalies for the 16 inch carbon steel pipeline transporting hydrocarbon fuel over 130 kilometres. Intelligent Pigging (IP) survey that was done for the fuel pipeline indicated erratic conditions at some sections of the pipeline. Subsequently, Direct Current Voltage Gradient (DCVG) survey was conducted and successfully verified the problematic sections of the pipelines. It shows that there were coating faults along the fuel pipeline. Therefore, as a Corrosion Engineer, recommendations and resolutions have been provided in order to prevent any further metal losses
Field Direct Assessment was performed at every measured defect section of the pipeline ranging from defect inspection, pipe-soil potential survey as well as the Wenner 4 Pin Method. All the corrosion-ferrous oxides defects on the pipe wall was completely grinded, scraped and clean. Successively, Ultrasonic Testing (UT) has been carried out in order to verify and recorded the metal loss of the fuel pipeline wall. A new set of anti-oxidant primer was applied on the damaged coating area with an additional 50% double overlapping coating wrap PE tape to provide premium protection. Existing TRU has been energized and fine tune to raise “off potential’ over -850mV CSE to protect the pipelines immediately after completing the coating repair work.
As a result of this case study, high soil resistivity area that surrounded 16 inch carbon steel fuel pipeline would require additional hot spot sacrificial magnesium anodes to provide extra protection.
In conclusion, the 16 inch carbon steel hydrocarbon fuel pipeline has now achieved protection by means of PE coating reinstatement and electrochemical cathodic protection. The results are kept within the limits protection criteria, in accordance to NACE SP-0169 for buried or submerged structures.