The invention discloses a film type liquid cargo containment
system which comprises a plane insulation module, a corner insulation module and a
nitrogen pipeline, the plane insulation module and the corner insulation module are fastened on the inner wall of a
storage tank cabin, and each of the plane insulation module and the corner insulation module is composed of a main layer insulation module and a
secondary layer insulation module. The main layer insulation module is fixed above the
secondary layer insulation module to form step surfaces, a first bridging module, a second bridging module and a corner region bridging module are respectively mounted on the step surfaces at different positions, and
nitrogen pipe mounting grooves are formed in the first bridging module, the second bridging module and the corner region bridging module through which a
nitrogen pipeline passes; the arranged nitrogen
pipe mounting grooves are connected to form a nitrogen arrangement pipeline; the invention further discloses a nitrogen pipeline mounting method. According to the thin film type liquid cargo containment
system, the nitrogen pipelines are embedded in the bridging modules, so that the flatness of the upper surface of the main layer insulation structure of the containment
system can be kept, and the thin film type liquid cargo containment system is adaptive to more types of corrugated plate structures.