Starting at the beginning of 2024, specialists from the Gas TSO of Ukraine (GTSOU) in cooperation with ROSEN Europe B.V. carried out in-line inspection (ILI) of 1,091.64 km of the linear part of main gas pipelines. This comprises 75% of the planned scope of work for the current year, and by the end of 2024 it is planned to inspect another 360 km.

The diagnostic process is supposed to be performed in several stages. The first stage, which is preparatory, involves the use of a cleaning piston (cleaning pigs) to clean the internal cavity of the gas pipeline. Following this, a direct diagnosis is performed: an intelligent intra-pipe inspection projectile moves with the flow of transported gas to detect and record the location and nature of defects.

The data received is being analyzed by GTSOU’s specialists, who identify areas of the gas transportation system that require attention. Based on the diagnostic results, decisions are made to change the operating modes and take measures to enhance the system reliability.

“The GTSOU team is continuing the Inline inspection project to examine the condition of metal and welded joints in gas pipelines. Thanks to modern methods, we are able to conduct diagnostics without having to open the system. Even during military operations, GTSOU performs a wide scope of works to ensure the reliability of gas transmission. Timely detection and elimination of defects reduces the probability of emergency situations. This activity is of great importance, especially with the heating season approaching,” emphasized Chief Engineer of GTSOU, Yuriy Zyabchenko.

Every year, the diagnostics department of GTSOU, based on the Inline inspection results, identifies defects that could impact gas transmission and need immediate examination. They also pinpoint are as requiring urgent repairs, specifically focusing on complex insulation repairs that involve partially replacing pipes.

GTSOU initiated the Inline inspection program for the gas transportation system in 2021, and entered into a corresponding agreement with ROSEN. Performing the diagnostics does not depend on the volume of gas being transmitted and is considered one of the most effective methods for assessing the condition of metal and welded joints in gas pipelines without the need for physically opening them. Every year, several thousand kilometers of the linear section of gas pipelines undergo inspection.