Northeast of the Yamal Peninsula (South Tambey) in 2013 became a place for development of a large gas condensate field, whose commissioning is scheduled for 2017. By that time, three production lines of the plant to produce liquefied natural gas (LNG) with a total capacity of 16.5 million tons of LNG per year will have been installed, and off-loading facilities shall be completed in the port of Sabetta.
Estimated natural gas production from this field exceeds 27 billion m3 per year. It is planned to drill more than 200 wells in 19 sites to achieve this volume.
Up to date works on South Tambey field development and drilling of exploratory wells have been already completed, the site and pile foundation for Train 1 of LNG plant are being prepared, 26 wells have been drilled. Dredging was carried out in the port of Sabetta that helped to open winter navigation in 2013 for the first time ever. This enabled more than 2.5 times increase loads accepted in 2014 goods including equipment and materials needed to continue construction. At the same time we completed the construction of the first phase of Sabetta airport that meets international standards and is able to accept aircraft such as Boeing 737.
During "Yamal LNG" project implementation Velesstroy concluded contracts with the French companies VINCI CONSTRUCTION GRANDS PROJETS and ENTREPOSE PROJETS, which works package includes construction of the unique facility worldwide - four cryogenic tanks for liquefied gas storage.
Each tank’s capacity is 160,000 cubic meters of liquefied gas. Total nominal scale of the field resource base is more than 1.2 trillion cubic meters. Operating capacity of the production, storage and dispatch of gas will be 27 billion cubic meters of gas per year. Never before such have been constructed in Russia!
The first contract concluded for the project in October 2013 concerned works on the construction of tanks base slab, external walls, as well as construction of a concrete domed roof. Contracts for the construction of a tanks steel roof and works on tanks inside and the external platforms were signed in June and November 2014. Thus, we can say that Velesstroy is completely responsible for construction of cryogenic tanks.
Each tank is made of more than 17 500 cubic meters of concrete and 3400 tons of rebars. The concrete grades used in construction are B25, B45 and B55, 1000 cubic meters of which is concrete base and 5 300 cubic meters is concrete slab, 8350 cubic meters is the tanks wall with the height of 44 meters, and 2 800 cubic meter refers to concrete roof. Weight of tanks steel roof consisting of 28 sections is up to 764 tons. The total weight of steel material for construction of tank inside part is more than 2 200 tons under the contract and the length of welds exceeds 23 000 meters.
Currently all four tanks have already been constructed and equipment installation inside the tanks have been already started.
One of the most pivotal operations was sliding formwork technology which had never been used by Velesstroy before. Therefore, the employees involved in the construction of the wall, were trained hard. Theoretical training for all those involved in the process ended with a practical exam, i.e. the construction of an experimental ten-meter wall at the test site. But the real challenge was the first tank construction. It became a ground for developing technological and organizational nuances, it showed what kind of sudden things can happen and how to avoid them when constructing the other three ones.
It should be noted that it is courage and drive for results of the employees and that helps Velesstroy to perform the work just in time, as well as to overcome the severe climatic conditions, the polar night, storm winds and strong Arctic frosts.