In March 2015, Transneft North, JSC completed scheduled repair works at sections of the Ukhta – Yaroslavl oil trunk pipeline (OTPL) of the Volodga RPD.
During the 50-hour oil pipeline shutdown, specialists of the Central Repair Service of the Vologda RPD of Transneft North, JSC successfully carried out scheduled repairs on the linear part at two sections: Gryazovets – Yaroslavl and Nyuksenitsa – Pogorelovo.
After stopping oil transportation, the Gryazovets – Yaroslavl section was isolated from the main pipeline using two main pipeline gate valves. Then, repair and connection of the new main pipeline gate valve were performed as a part of the transition program to a pitless oil evacuation method during scheduled repair works at a linear section. The new technology allows for making repairs in an environmental-friendly mode. No contractor organizations were engaged for this purpose.
The Ukhta – Yaroslavl OTPL was commissioned in 1974, and the scheduled replacement of the pipeline made of low-reliable steel was performed to improve its reliability during further operation and to reduce the risk of emergencies. When replacing a pipeline section, the most important work involves cutting a section of the operating pipeline and connecting a new one. All the phases of “tapping” were completed in full compliance with work implementation on replacement of pipeline sections.
By the end of the year, the Vologda RPD will complete scheduled repair works at another six sections of the Ukhta – Yaroslavl oil trunk pipeline. In total, about 49 km of the oil trunk pipeline have to be replaced, including pipe replacement at two sections across the minor water streams of the Erga and Neznakha Rivers. The works are performed to ensure the safe operation of the oil trunk pipeline and to prevent negative impacts on the environment.