Manga LNG natural gas terminal was completed in late 2017 in Röyttä, Tornio, with Wärtsilä Projects Oy as the main contractor. Tormets Oy signed a subcontracting agreement regarding the installation of the terminal's transfer pipes and pipe bridge steel structures.
Transfer pipework consists of both process and installation pipes.
Liquefied natural gas (LNG) transfer pipes from the vessel unloading area to the storage tank, and from there to the evaporator compressor building and the tank truck loading terminal, circulation pipes included. The temperature of the LNG varies between -165...-51 oC and the pipes are insulated with 2 or 3 layers of polyurethane. Vaporized natural gas (BOC) transfer pipework needed for circulating gas between the vessel, the tank and the vaporizer station as part of the vaporization process. Working temperature of warm natural gas is -50...+50 oC and the pipes have one layer of insulation.
The system includes a Flare, to which gas can be led in exceptional situations and burnt in a controlled manner. All process subsections are fitted with a connection to Flare's exhaust line for controlled burning.
Due to impact resistance requirements and the temperature of the medium, all process pipes used while handling liquefied natural gas are made of austenitic steel.
Gas pipeworks comply with PED 2014/68/EU (pressure equipment directive), EN 13480 (metallic industrial piping) and the Finnish SFS-EN 15001-1 standard (gas infrastructure).
In addition, the system contains installation pipes for both the process and the facilities. These include nitrogen, fire water, driving water and district heating pipes, some of which are insulated. In all, the gas and installation pipework is more than 4 kilometers long and requires some 200 tons of steel structures as support.
Tormets' delivery also included the pipework and equipment installation for the terminal fire water pump house and the underground fire water network (DN400/PEH) for the entire terminal, including 11 fire water hydrants and two automatic water cannons positioned in the most critical locations. The pump house has two diesel pumps and one electric motor pump to ensure sufficient supply in every situation.