Controlled ferrite for LNG and Cryogenic application

Liquefied natural gas (LNG) is becoming more important in the world fuel market and with increasing demand the construction of LNG facilities is on the increase. LNG facilities make use of various materials for the onerous conditions that they will be subject to, including concrete, aluminium, 9% nickel steel and austenitic stainless steels. Welding Consumables for MMA, TIG, SAW, FCAW specifically designed and manufactured to achieve excellent mechanical properties at -196°C.

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The Isle of Grain facility is owned by National Grid Transco’s subsidiary, Grain LNG Limited. The £355million expansion tripled the storage capacity and a second phase, due to be completed in 2008, will again increase the capacity to import and process up to 9.8 million tonnes of LNG, representing 12% of the UK’s annual gas demand.

The most important criterion for service at cryogenic temperatures is normally toughness, and it is important that the weld metals used are capable of achieving good toughness. Large land based storage tanks are normally fabricated from 9% nickel steel and ship’s storage tanks of aluminium but pipework for distribution etc is often made from austenitic stainless steel. The welding consumables for 9% nickel steels and 304L/316L austenitic stainless steels are tested down to -196°C (-320°F).

The Metrode CF electrodes were originally designed in the early 1990’s to satisfy the requirements of Mobil/Ralph M Parsons for the SAGE (Scottish Area Gas Evacuation) project terminal at St Fergus. The plant, run by Exxon- Mobil, has now been processing gas since 1993. A number of weld procedures were completed covering different welding processes and pipe sizes.

Gas shielded flux cored arc welding, Supercore 308LCF, being used for the first time during construction of the Grain-LNG importation facility on the Isle of Grain, UK