What is a Pig?
A pig is defined as:
A device that moves through the inside of a pipeline for the
purpose of cleaning, dimensioning, or inspecting.
Why Pig in a Pipeline?
1- Construction and commissioning .
2- In service (Cleaning & Sealing).
3- Routine pigging for corrosion and metal loss inspection
1- Construction and
After the pipeline is built, it will be necessary to run
pigs to :
1- Remove any debris left in the line from new
construction; items such as lunch boxes, tools, welding
rods, dead animals trapped in the line, etc.
2- Verify the ovality of the pipeline by the owner.
MBD-18-LRR_LGRR: BIDI with Brush and
Gauge Plate (410 mm) (2010)
CLP-MBD-18-LRR_LRR: 18” Heavy Duty
Cleaning Tool (2011)
MBD-18-LRR_LRR: BIDI with Ring Brushes
MBD-18-LRR_LGRR: BIDI with Brush and
Gauge Plate (401 mm) (2012)
H16-3.A: Heavy Duty Cleaning Tool (2012)
2- In service:
When the pipeline is in service :
1- Remove accumulated water in product pipelines
2- Remove any water that has accumulated in the low
spots of the pipeline and reduce corrosion.
3- Separate products in pipelines that handle multiple
products such as various grades of gasoline, heating
oils, and jet fuels
3- Routine pigging for corrosion
and metal loss inspection:
Before Inspection pigging:
1- Pre-Inspection pigging before running an ILI (In Line
Inspection) tool will not only require the pipe be clean but a
dummy pig be run to assure the ILI tool will go through the
2- Under certain conditions pipelines may require chemical
cleaning or a train of gel pigs may be used for certain
1-Insert Intelligent Inspection Pig at certain point and follow
him and receive it at certain point, for inspect metal loss and
• A profile pig multiple gauging plates, usually three
plates. One plate is mounted on the front, one in the
middle, and one on the rear of the pig.
• It is normally used before running an ILI (In Line
Inspection) tool to assure the tool's passage around
bends and through the pipeline.
• is a gauging pig with
How it works:
» Instrumented pig travels with the propelling force of the fluid being
pumped through the pipeline. While traveling inside the pipeline the
onboard data recording systems record the defect data. The data is retrieved
and interpreted after receiving the pig at the receiving pump station.
» The data on external and internal defects is reported with fairly good
accuracy with respect to defects sizing and location.
» On the basis of this data the pipeline operator can take appropriate
corrective measures depending upon the severity of the defects.
Instrumented Pig is a device for inline inspection of buried pipelines
to monitor their health and assess the risk associated with their
Principle of operation of Intelligent PIG:
» Instrumented pig works on the principle of Magnetic Flux
Leakage (MFL) and detect the mechanical defects by sensing
the change in flux near the pipe wall under the influence of
applied magnetic field.
» The change in magnetic flux signal depends upon the
extent and type of metal loss, changes in material and its
Principle of operation of Intelligent PIG: (MFL)
Magnetic Flux Leakage (MFL)
Corrosion Detection Pig(CDP)
Axial MFL (CDP) (2010 & 2011)
Three Axis MFL (2012)
Transverse Field (TFI)
To detect a specifically (Axially) shaped defects like
tunnel corrosion and longitudinal weld anomalies.
Offshore Cathodic Protection
Survey Service & ROV
Corrosion can be defined as “the destruction or deterioration
of a material because of reaction with its enviroment”.
For corrosion to occur, all four of the following conditions
need to be present:
Site for the reduction reaction to take place (cathode)
Site for oxidation reaction to take place (anode)
Electrical path – electrical continuity to allow electrons to
transfer to the corrosion site.
Ionic path – Medium that allows the metallic ions to be