One year after the GIPL gas pipeline connecting the Lithuanian and Polish gas transmission networks was put into operation, internal diagnostic tests of the pipeline are carried out as planned. The testing checks the condition of the pipeline and assesses whether the pipeline is free from damage and defects after one year of operation.
“Even though the GIPL pipeline is new, properly tested and safely operated, we have an obligation to inspect the initial condition of the pipeline by means of internal diagnostics and ensure its maintenance. The first internal diagnostic testing for the connection with Poland was planned when the pipeline was designed. This year, the Polish gas transmission system operator will also carry out diagnostic work on its part of the pipeline. The GIPL pipeline carries gas to both Lithuanian and Polish consumers, so it is important to ensure uninterrupted operation of this gas interconnector," said Andrius Dagys, Technical Director of Amber Grid.
The inspection of the GIPL pipeline, which is being carried out by Amber Grid specialists together with UK contractors, will last until 4 July. First, the cavity in the pipeline is cleaned using a special device that travels inside the pipeline pushing the gas flow. Afterwards, the walls of the pipeline will be scanned with a smart device. Contractors are expected to provide an analysis of the pipeline’s condition a month later.
In the first half of 2022, prior to the commissioning of the GIPL, all necessary tests were carried out, the pipeline’s welds were X-rayed, the most important ones were ultrasonically inspected, and the pipeline was subjected to high-pressure hydraulic tests. Using high-resolution diagnostic equipment, the internal geometry of the pipe was checked by measuring the internal cavity of the pipeline with a special robot to look for possible mechanical damages. Once the internal diagnostic tests were positive, the pipeline was connected to the existing section of the gas transmission system.
Later, in autumn 2022, the GIPL was tested at maximum capacity. Two tests were carried out to ensure that the pipeline can carry the full flow of gas within the technical parameters of the GIPL construction without interference.
The GIPL pipeline has been in active operation since its launch in May 2022. Gas suppliers have already commercially transported 12.6 terawatt hours (TWh) of gas on the new transmission line. The interconnection is not only of interest to Lithuanian and Polish system users, but also to the entire surrounding Baltic and Finnish region.
The length of the GIPL in Lithuania is 165 km. Lithuania has a total of 2,285 km of main gas pipelines installed.
