The manual excavation of oil storage cavern is to excavate tank chamber in mountain rock. After the formation of tank chamber, steel vault roof is set up inside to store oil products. The cavern is concealed, low temperature all the year round featuring safe reservation with good quality of oil products and low loss.

Based on the technology of the underground water-sealed cavern reservoir, CEI has completed design of a manual-excavation cavern storage for China oil reservation. Its complete engineering and technical ability reaches the advanced level in the industry.