Binhai LNG project is located in the northeast of Subei faulted basin in the Yangtze fault block area. The strata are well developed and a set of shallow marine, coastal and continental materials are deposited. The Quaternary sedimentary thickness is about 150m. The ground elevation is generally between 0.6m and 9.8m.
According to the ground elevation (zero point of the waste Yellow River), the whole county can be divided into three types: high elevation land, sub highland and low-lying polder area. The general landform can be divided into marine sedimentary Shagang paleosol area, high beach area along the waste Yellow River, yellow pan slope area, Qunan water network area and Fanshen River low-lying area.
Under this complex geological condition, in addition to complex construction conditions such as large population, wide water network, vertical and horizontal roads and discontinuous pipeline laying operation surface. Sichuan Oil Engineering & Construction Co., Ltd. adopts 5 sets of Xionggu A-806/36 internal welding machines and 40 pieces of A-610 dual torch pipeline automatic welding machines (20 welding workstations). Till November 19th, there were 5 spreads of automatic welding machines. The number of welded joints per day of the first spread was 56, the number of welded joints per day of the fifth spread was 55, the number of welded joints per day of the second spread and the third spread were 24 respectively, and the total number of welded joints per day was 159.
This set a new record for the number of welded joints. Sichuan Oil Engineering & Construction Co., Ltd. also set a record in the number of welded joints per day in the same project using the welding spread of Xionggu pipeline internal welding machine and dual torch pipeline automatic welding machine.