JPS6184500A - Low temperature storage tank - Google Patents

Abstract

PURPOSE:To prevent generation of stress accompanying temperature change and improve heat sealing performance by providing a corrugation corresponding to a joint position of a panel kept cool on a metal lining and providing a clamp seal on a bolt inserting portion. CONSTITUTION:A metal lining 2 and a panel 3 kept cool are fixed to be attached to the inner face side of an outer tank body 1 by stud bolts 5 put at a proper interval, and proper joints are provided between respective panels 3 and an inner tank membrane 6 is applied to outside of the inner face of the panel 3. And the metal lining 2 is applied corresponding to the joint position of the panel 3 and corrugation 2a is provided with proper distance. Connecting portion of the metal lining 2 is connected by welding 2'a the distance between top points by making an adjacent end edge portion of the metal lining 2 bent on flange at a right angle and making the bent portion fit each other on their back.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of sedentary use) The present invention relates to a membrane type low temperature storage tank for storing liquefied gas (LNG, LPG), etc. at low temperature.

(Prior Art) In the conventional example of the low temperature storage tank and membrane type low temperature ground storage tank, a secondary barrier is provided on the inner surface of the concrete outer tank frame, and the secondary barrier is of the coating type. It can be roughly divided into metal lining type and metal lining type, but with the coating type mentioned above, there is a risk that the containing membrane may be destroyed due to the "ice ranging phenomenon" when the outer tank frame repeatedly freezes and thaws due to large temperature fluctuations inside the storage tank. This causes reliability problems and makes repairs, etc. troublesome. Further, in the metal lining type, since the stored material is at an extremely low temperature, countermeasures against thermal stress are required, and there are also problems such as airtightness at the bolt insertion hole portion where the metal lining is fixed.

(Objective of the Invention, Means for Solving Problems) The present invention was developed to address the above-mentioned problems in conventional low-temperature storage tanks, and includes a metal lining placed on the inner surface of the outer tank body. Further, a cold insulation panel is arranged on the inner surface of the metal lining and attached with planting bolts, and a corrugation is provided on the metal 2 innings described in mI corresponding to the eye position 14 of the cold insulation blankel described in MiJ, and the bolts of the metal lining are The insertion part is characterized by a tightening seal, and a cooling/ξ panel is further attached to the inner surface of the metal lining attached to the inner surface of the outer tank body, and a cooling panel is attached to the metal lining. By providing corrugations corresponding to the joint positions and providing tightening seals at the bolt insertion portions, stress generation due to temperature changes is prevented and heat sealing performance is significantly improved, improving the storage performance and reliability of ultra-low temperature stored items. Point F provides a low-temperature storage tank that significantly improves... and eliminates the problems mentioned in Section I.

(Embodiment of the invention) An embodiment of the present invention is shown in FIGS. 1 to 4,
In the figure, (1) is a concrete outer tank frame with appropriate reinforcement, and the metal lining (2) is placed all over the inner surface of the outer tank frame m. Furthermore, cold insulation panels (3) formed into blocks of various appropriate shapes are disposed on the inner surface of the metal lining (2) in a V stiff manner, and are placed at appropriate intervals on the inner surface of the outer tank body fil. The metal lining (2) and the cold insulation panel (3) are fixed by the planting bolts 5) planted at the same time.
Appropriate joints are provided between the cold insulation piles (3), and an inner tank membrane (6) is installed on the inner surface of the cold insulation spring '/L-(3+). As shown in the figure, it is applied over the entire inner side surface and bottom surface of the outer tank frame (1).

Furthermore, the Aij metal lining (2) is provided with corrugations (2α) at appropriate intervals to correspond to the joint positions of the cold insulation panel (3), and the connecting portion of the metal lining (2) is connected to the second As shown in the figure, the adjacent end edges of the metal lining (2) are bent at right angles with 7 lunges to put them back to back, and the vertices are connected integrally with the corrugation (2'α) by bathing (2'α). In addition to having a similar configuration, the flat plates may be overlapped and welded to connect each other if necessary.

(Illustration omitted) Furthermore, as shown in Fig. 3, metal lining (2
)K provided bolt insertion hole (in hole 2, there is a tightening seal made by applying force and tightening the packing material (7) with the tightening nut (9) through the washer (8)). Further, after the tightening nut (9) is installed, an adhesive to prevent screw loosening can be applied to seal the whole.

A flanged nut can be used for the tightening seal mechanism, or a resin seal can be used and tightened only with the nut.

(Operations and Effects of the Invention) Since the present invention has the above-mentioned configuration, the extremely low temperature inside the low temperature storage tank is handled by the inner tank membrane (6) and the cold insulation tube (6).
3) The multi-layered structure of layers and metal lining (2) significantly improves insulation and sealing performance, and
Inner tank membrane 16) and metal lining (2)
Since the corrugations (2α) are arranged at appropriate intervals, the corrugations (2α) flexibly expand and contract in response to large internal temperature changes, that is, have an opening effect, and the surface The occurrence of thermal stress inside is almost eliminated, and
The M tightening seal significantly improves the airtightness of the bolt insertion hole (2b), and greatly improves heat insulation performance and reliability.

Although the present invention has been described above with reference to an exemplary embodiment, the present invention is, of course, not limited to such embodiments, and may be modified in various ways without departing from the spirit of the present invention. be.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a part of the inner surface of a low-temperature furnace showing an embodiment of the present invention, Fig. 2 is a cross-sectional view showing the combination of metal lining and corrugation, Fig. 3 is a cross-sectional view of the bolt insertion hole portion, FIG. 4 is a longitudinal sectional view showing the overall shape of the low temperature storage tank. 1: Outer tank frame 2: Metal lining 2α: Corrugation 2b: Bolt insertion hole 3: Cold insulation pile
5: Stud bolt 6: Internal membrane 7: Packing material 8: Washer 9 = Tightening nut sub-agent
Patent attorney: Shige Okamoto, 3 people (Fig. 3)

Claims (1)

[Claims] A metal lining is arranged on the inner surface of the outer tank frame, and a cold insulation panel is further arranged on the inner surface of the metal lining and attached with planting bolts, and corrugations are provided on the metal lining corresponding to the joint positions of the cold insulation panel. A low-temperature storage tank characterized in that a tightening seal is provided at a bolt insertion portion of the metal lining.