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Corrosion Control

Incharge(CorrCont)

AHMAD JAWAD KHAN

Incharge

Corrosion Control Department is proactive in protecting the company’s buried pipelines infrastructure laid down in Transmission sections and Distribution regions from the attack of corrosion and rust by applying Cathodic protection technique through 1,812 Nos CP stations covering MS Distribution network of 71,725 Kms and Transmission Network of 9,014 Kms. CP System is monitored through 38,631 Nos PSP test points on pipeline network. The CP data collected from field is compiled in data base cell at corrosion control Centre Kot Lakhpat, Lahore.

Core Functions

The department has been established to perform following core activities.

1- Design and Construction

  • Front End Engineering Design
  • installation and commissioning of Cathodic Protection System
  • Production of Corrosion Control hardware and allied material
Fabrication of Transformer Rectifier Unit Soil resistivity survey

2-Monitoring and Maintenance

  • Bi-annual Pipe to Soil Potential surveys
  • DCVG surveys of new & old Transmission & Distribution lines
  • Close Interval Potential Survey (CIPS)
  • Fortnightly inspection of Cathodic Protection Stations.
  • Periodic Technical Audit of existing CP System in Transmission & Distribution.
  • Pipeline Integrity assessment for External Corrosion
  • Preventive and Break down Maintenance of TR units & CP Instruments.
  • Renovation of Ground-bed.
 

Supporting Functions

1- Underground Gas Leakage Detection

Corrosion Control Department is also contributing in reduction of company's losses (UFG) by conducting Underground Gas Leakage detection survey through Laser based leak detection equipment (hand held and vehicle mounted).

  • The entire distribution network (105,586 Km) has been scanned successfully by detecting 190,732 Nos. leak points, as per company's UFG reduction plan (F.Y. 2012 to 2017)
  • More than 60% distribution network has been scanned during 03 years (F.Y. 2017 to 2020) as per "Key Monitoring Indicators" and further scanning is in progress.
 

2- Coat & Wrap Section (Transmission)

The health assessment of existing coating system is performed as a part of pipeline integrity assessment programme and coating rehabilitation plan is devised in view of the findings of assessment. Coating Rehabilitation of 12,300 meters of pipeline segment has been completed during last three years.

  • The entire distribution network (105,586 Km) has been scanned successfully by detecting 190,732 Nos. leak points, as per company's UFG reduction plan (F.Y. 2012 to 2017)
  • More than 60% distribution network has been scanned during 03 years (F.Y. 2017 to 2020) as per "Key Monitoring Indicators" and further scanning is in progress.
 

Long Term Objectives

Remote Monitoring of CP System

To effectively monitor such a huge CP system in SNGPL, a GSM operated remote monitoring data transmission unit (RMU) is developed by utilizing the in-house expertise and output of 1,390 CP stations is now remotely monitored on daily basis. The data is centrally registered and is easily accessible through a web based data management application. Further 38 CP stations on Transmission network are also being monitored through company’s SCADA system.

 

Alternate Source of Energy for Un-interrupted System

In view of the prevailing energy crisis in the country power outages are very common which compromises our CP system performance.

In order to ensure integrity of our high pressure transmission networks against external corrosion; Un-interrupted Cathodic Protection is our high priority objective. In pursuance to this objective we have employed alternate energy sources i.e. thermoelectric Generators (TEG), Solar Panel system, battery backup system etc.

 

Pipeline Integrity Management Programme

In order to ensure the integrity of our high pressure Transmission network; a risk based pipeline integrity Management Plan had been chalked out in line with ASME B31.8S.

All the functions of pipeline integrity i.e. historical data, threat identification, high consequence areas, risk assessment, inspection technique, inspection plan, remnant life calculations etc. are managed through a centralized web based software application. The Integrity of ~600 KMs of pipeline segments has been assessed during last three years.