Data recorded by electronic geometry pigs make it possible to reveal anomalies of internal pipeline bore and estimate their sizes. During electronic geometry survey, girth welds and pipeline construction features are registered, as well as pipeline passability is estimated for further inspection by magnetic or ultrasonic intelligent tools.

If required (as an option) the electronic geometry pigs can be equipped with navigation unit.

Analysis of signals of navigation unit, if the electronic geometry pig is equipped, makes it possible to detect and classify bends (deviations of the pipeline axis from the straight direction) and calculate geodetic coordinates of all the detected anomalies and pipeline construction features.

Electronic Geometry Pigs (EGP)

EGP-1200 Ø 1200 mm

Tasks

EGP is intended for measurement of internal pipeline bore profile and determination of pipeline axis position.

Operation principle of electronic geometry pig is based on reconstruction of pipe internal cross section according to the data of lever measuring system. Cross section is reconstructed by means of recording angular position of the levers covering 100% of pipe internal circumference. Pipeline axis position is determined with the use of inertial navigation system data.

Pipeline features and deformations of pipeline surface detectable by electronic geometry pig:

Pipeline location features

• bends (turns)

• bend radius

• turn angle

Cross section deformation

• ovalities

• dents

• wrinkles

Construction features

• girth welds

• valves

• tees

• ties-in

• change of internal diameter

Operation parameters

Minimum pipeline bend radius:

11.5 of pipeline outside diameter

Minimal passable diameter:

0.7 of pipeline outside diameter

Operation speed range:

0.5 - 4 m/s

Optimal movement speed:

2.0 – 3.0 m/s

Maximum pressure of the medium:

12 MPa

See more:

In-line inspection

Electronic Geometry Survey