Tank top installing and welding process of single-coating double-wall low temperature storage tank

Abstract

The invention relates to a tank top installing and welding process of a single-coating double-wall low temperature storage tank, which is characterized by comprising the following steps of: (1) installing temporary buttresses on an outer tank base plate and on an outer tank wall, installing and welding pressure bearing rods on the temporary buttresses, and building a full scaffold in the outer tank of the low temperature storage tank; (2) welding a net rack on the outer tank top; (3) welding top plate: welding each top plate on the net rack; (4) installing each suspension rod on each corresponding H-shaped steel, and removing the internal full scaffold; (5) installing and welding an inner tank suspended ceiling on the outer tank base plate; (6) lifting the welded inner tank suspended ceiling by using a leading chain, and connecting with each suspension rod; and (7) welding compression resisting rings: installing and welding the compression resisting rings at the junctions of the pressure bearing rods and the top plates of the outer tank top. Compared with the prior art, the process only requires building the full scaffold once and has the advantages of fewer temporary tooling quantity, low construction difficulty, simple construction procedures, capability of ensuring working safety, high construction quality and construction efficiency and low construction cost.

Description

technical field [0001] The invention relates to a tank top assembly and welding process for a single-containment double-wall cryogenic storage tank. Background technique [0002] Single-containment double-wall suspended ceiling low-temperature storage tanks are mainly used to hold liquefied hydrocarbon gases such as methane, ethane, ethylene, and propylene. The schematic diagram of the cross-sectional structure of a single-containment double-wall suspended ceiling cryogenic storage tank is as follows: figure 1 As shown, the cryogenic storage tank includes an inner tank and an outer tank, and the inner tank is located inside the outer tank. There is a certain distance between the peripheral wall of the inner tank and the peripheral wall of the outer tank, and the gap between the two is filled with cold insulation materials to form a cold insulation layer; the ceiling of the inner tank is flat and welded to the upper end of the peripheral wall of the inner tank; the cryogen...

AI Technical Summary

Problems solved by technology

[0005]In short, the existing single-containment double-wall suspended ceiling cryogenic storage tank roof welding process is difficult to construct, has a long construction period, and costs a lot, and is not conducive to engineering safety. , quality and cost comprehensive control

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