Design and Construction of a 140,000 Cubic Metre LNG Inground Storage Tank

A 140,000 m3 LNG inground storage tank is now being constructed at the Tokyo Gas Sodegaura LNG receiving terminal. In order to reduce costs, we made improvements over the 130,000 m3 tanks constructed previously. Improvements in the slurry wall included utilizing it as the major component of the side wall by using high strength underwater concrete with a high performance water reducing agent, modifying the circumferential joint and by integrating the slurry wall with the side wall by binding rebars. The slurry wall itself can withstand earthpressure and groundwater pressure during construction and the composite side wall can withstand seismic and thermal loads after completion. We also adopted a drainage bottom type structure based on actual seepage-water flow rate of the 100-m deep slurry wall developed and constructed for 130,000 m3 tanks. In addition to these, this tank is designed to receive LNG from different source by adopting countemeasures such as top/bottom feed, densitometer, etc., against roll-over phenomenon.