From the beginning of production to the completion of the production of LNG storage tanks, the process is relatively complicated and takes a long time. Each process must be rigorously operated, and there must be no sloppy, otherwise the entire tank may not be used. From the following:

1) First assemble the 3 tube sections to ensure that the long-arm submerged arc welding machine can weld.

2) Use the cylinder body group to pair the tooling group to the cylinder section, and fix the outer side by hand welding.

3) Inner submerged arc welding, outer carbon arc gouging to clean the roots and polished with a grinding wheel to make the luster, outer submerged arc welding.

4) After welding, 3 to 4 girth welded support molds can be removed, but the girth welded support molds at both ends must be retained.

5) In the future, each group will weld one section of the cylinder, or two sections of the cylinder can be welded together, provided that the long-arm submerged arc welding can be welded.

6) By analogy, the final cylinder body is said to maintain 6 girth welded supporting molds.

7) Surface grinding of all welds, and 20% of the welds are qualified by radiographic inspection.

8) After the flaw detection is qualified, the reinforcement ring is assembled, the mixed gas shielded welding spot is fixed, the mixed gas shielded welding is welded, the welding is interrupted, and the welding is 100 and 80.

9) Scribe the cylinder body and open the pipe. The opening position should avoid the welding seam distance not less than 100mm. Use a grinding wheel and grinding head to polish the groove, set the explosion-proof device to take over the pipe and perlite filling tooling, and hand arc welding. Point fixing, manual welding, welding wire H10Mn2.

10) The inner surface of the outer cylinder must be sandblasted to remove rust before the inner and outer cylinders are assembled.

11) Assemble and weld the horizontal pull strap lugs and assemble the horizontal pull strap.

12) Group butt welding explosion-proof device, group butt welding perlite filling hole, group butt welding horizontal connection with craft hole.