CH-HW-ENG-Tyumen Region, Jetty Bottom Reinforcement in Sabetta

CASE HISTORY Rev: 01, Issue date: April 22, 2020 JETTY BOTTOM REINFORCEMENT IN SABETTA PORT YAMALO-NENETS AUTONOMOUS OKRUG, TYUMEN REGION HYDRAULIC WORKS, OFFSHORE AND ONSHORE STRUCTURES Products: Reno mattresses®, Jumbo Gabions

Site Description The Northern Sea Route, the main shipping route of the Russian Arctic, plays a key role in development of the Russian Arctic zone and of its unique natural resources. For establishing this route, development and upgrading of associated port facilities as well as the transport infrastructure are of primary importance.

The port of Sabetta is an Arctic port near Sabetta settlement at the western coast of the Gulf of Ob in Yamal district of Yamalo-Nenets Autonomous Okrug, Tyumen Region. The port is intended for transportation of liquefied natural gas and for year-round navigation along the Northern Sea Route.

Sabetta, the youngest among Russian sea ports, has become the absolute leader in the country in terms of cargo turnover growth. Raw hydrocarbons are produced at South Tambey gas condensate field of Yamal Peninsula for further processing and transportation. Liquefied natural gas is Sabetta port construction on Jamal Peninsula exported to Western Europe, Americas, and Asia-Pacific countries.

The port is being built as part of Yamal LNG project based on public–private partnership and is the largest infrastructure project in the world today being implemented in Arctic.

Customer: YAMAL LNG OJSC Designer: LENMORNIIPROEKT JSC Assembly tests of Reno mattresses®. Weighing according to the Rus-

General Contractor: sian State System for Ensuring the Uniformity of Measurements

MRTS SEA PORTS LLC Contractor: © COPYRIGHT ARKHANGELSK RIVER PORT CJSC Contractor: FERTOING LLC MACCAFERRI Applied products: ® NON-STANDARD SIZE RENO MATTRESSES 10.5 × 1.5 × 0.3 – 7,000 PCS. JUMBO GABIONS 6 × 2 × 0.5 – 675 PCS. reserved. rights All isprohibited. copying Any 2020 © Construction period: JULY 2018 TO THE PRESENT DAY (SEPTEMBER 2019) Transportation of filled Reno mattresses® The total investments in the project amount to 108 billion A problem was found during the navigation season: wave rubles including 72 billion rubles provided from the Federal flows from vessel engines were scouring foundations of budget of Russia. The project's general contractor is process jetty support walls. This problem was aggravated by Mezhregiontruboprovodstroy JSC. Construction of the port soft soils at the bottom of the approach channel. began in 2012, and the first cargo vessels were received here in 2013. Solution Experts of LENMORNIIPROEKT, MRTS SEA PORTS, and Challenge FERTOING together with engineers of Maccaferri Gabions Three large hydraulic structures are being built within the CIS decided to reinforce the space under the jetties with Reno framework of sea port construction near Sabetta settlement: mattresses®.  approach channel: 6 km long, 495 m wide, 15.1 m deep;  sea channel: 49 km long, 295 m wide, 15.1 m deep; Harsh Arctic conditions, absence of developed infrastructure, and geographical remoteness of the construction site caused  harbor basin: 15.2 m deep. certain difficulties in project implementation.

The works are performed in harsh geological, climatic and The main problem was that it was impossible to fill Reno hydrological conditions inside the Arctic Circle. This is a mattresses® with rock material directly on site in Yamal. completely greenfield construction project. There is absolutely Contractors had to find an assembly area and fill the no transport infrastructure at the coast, and the navigation structures prior to transport them and to install at the work season when dredging can be performed and heavy cargoes site. can be delivered by sea is very short, about 70 days (August to October).

Reno mattresses® stacked at the test stage Preparation of Reno mattresses® for dispatch to Yamal

Reno mattresses® being tested in Arkhangelsk 1. Assembly Tests of Reno Mattresses® In May 2017, Reno mattresses® were tested at the site of FERTOING LLC: they were assembled, fit with embeds for fixing to a lift spreader and hoisted and handled as complete structures. The tests helped to define the proper types of embeds and of the lift spreader and to developed recommendations on stacking, separation and transportation of gabion structures.

Actual installation, filling of mattresses with rock material and further transportation from Arkhangelsk to Yamal were performed by MRTS SEA PORTS LLC, Arkhangelsk River Port CJSC, and FERTOING LLC.

2. Development of Process Flow Chart Due to the high level of criticality of Sabetta sea port facilities ® and high safety requirements for diving and loading Preparation of Reno mattresses for transportation operations, experts of all the companies involved in the project jointly developed a special process flow chart.

This process flow chart addressed the following factors:  structure weight: each mattress was assembled on a weighing system.  number of lifts of a structure on a lift spreader to ensure firm and correct installation of embeds.

The final and the most critical part of the process was transportation of Reno mattresses® to the installation site and their laying to the seabed near process jetties.

Hoisting and handling of Reno mattresses® with a lift spreader

Loading and transportation of Reno mattresses® to the installation site

Installation of Reno mattresses® using GPS navigation Reno mattresses® being laid to the bottom of the approach channel

3. Laying Reno Mattresses® to the Seabed Near This system enabled installation of four filled mattresses with Process Jetties the total area of 63 m2 during one submersion to the depth of ® The installation process was complicated by a significant 15 m. Reno mattresses were installed to their design depth of the approach channel. Contractors’ specialists positions with high accuracy. The total area of seabed 2 decided to install Reno mattresses® using pre-calculated reinforcement near the process jetties was 118,350 m . coordinates tied in to the mattress layout map. For this purpose a submersible lifting complex Tetris with GPS navigation engineered by FERTOING LLC and an

automatically detaching lift spreader were used.

Reinforcement of the seabed with Reno mattresses® under the jetties in the port of Sabetta MACCAFERRI GABIONS CIS LLC 13 Sharikopodshipnikovaya Street, bldg. 1, Moscow, 115088 Tel.: +7 (495) 108-58-84 E-mail: [email protected] www.maccaferri.ru