CN109353459B

CN109353459B - Installation method of insulating layer at welding seam of independent liquid cargo tank

Info

Publication number: CN109353459B
Application number: CN201811231543.9A
Authority: CN
Inventors: 陈兵; 朱彦; 周清华; 王亮; 于瑶; 王洁
Original assignee: Jiangnan Shipyard Group Co Ltd
Current assignee: Jiangnan Shipyard Group Co Ltd
Priority date: 2018-10-22
Filing date: 2018-10-22
Publication date: 2020-06-09
Anticipated expiration: 2038-10-22
Also published as: CN109353459A

Abstract

The invention provides a method for installing an insulating layer at a welding seam of an independent liquid cargo tank, wherein a plurality of welding seams are arranged on an outer plate of the independent liquid cargo tank, and the method comprises the following steps: s1, manufacturing a protective cover according to design requirements, wherein two support legs are arranged at the bottom of the protective cover, and a concave part is formed between the two support legs at the bottom of the protective cover; s2, adhering two support legs to the outer plates on two sides of the welding seam by using an adhesive; and S3, arranging an insulating layer with the same height as the protective cover on the outer surface of the outer plate. The liquid cargo protective cover has the beneficial effects that the concave part is arranged at the bottom of the protective cover, the cavity is formed between the concave part and the protective cover, and the protective cover is not in direct contact with a welding line, so that the falling of an insulating layer caused by the expansion caused by heat and the contraction caused by cold of the welding line can be greatly reduced, and the liquid cargo operation safety is ensured.

Description

Installation method of insulating layer at welding seam of independent liquid cargo tank

Technical Field

The invention relates to a method for installing an insulating layer at a welding seam of an independent liquid cargo tank.

Background

A liquefied gas carrier is a special vessel for transporting low-temperature liquid cargo such as liquefied petroleum gas or liquefied natural gas, which is loaded in a cargo tank of the liquefied gas carrier, and an insulation layer is attached to an outer surface of the cargo tank because the temperature of the liquid cargo is low. The primary purpose of the tank insulation is to prevent external heat from entering the interior of the tank and thereby reduce the amount of evaporation of the cargo.

For an independent cargo tank, a plurality of butt welds are arranged on the outer plate of the independent cargo tank, and the traditional insulation layer installation process is to directly lay an insulation layer on the outer plate of the cargo tank and the outer surface of the butt welds. Due to the characteristic of low temperature of liquid cargo, the phenomena of expansion with heat and contraction with cold can occur at the outer plate and the butt weld of the liquid cargo tank when the liquid cargo is loaded and unloaded, but the deformation at the butt weld is very obvious, so that an insulating layer laid on the butt weld is easy to fall off, and the operation safety of the liquid cargo is seriously influenced.

Disclosure of Invention

Aiming at the defects, the invention aims to provide a method for installing an insulating layer at the welding seam of an independent liquid cargo tank, thereby effectively preventing the insulating layer from falling off caused by thermal expansion and cold contraction and ensuring the operation safety of liquid cargo.

The invention provides a method for installing an insulating layer at a welding seam of an independent liquid cargo tank, wherein a plurality of welding seams are arranged on an outer plate of the independent liquid cargo tank, and the method comprises the following steps:

s1, manufacturing a protective cover according to design requirements, wherein two support legs are arranged at the bottom of the protective cover, and a concave part is formed between the two support legs at the bottom of the protective cover;

s2, adhering two support legs to the outer plates on two sides of the welding seam by using an adhesive;

and S3, arranging an insulating layer with the same height as the protective cover on the outer surface of the outer plate.

Preferably, the insulating layer is formed by spraying a polyurethane material.

Preferably, the protective cover is made of polyurethane material.

Preferably, the polyurethane material density of the protective cover is greater than the polyurethane material density of the insulating layer.

Preferably, the recess is symmetrical about the weld.

Preferably, the protective cover has a rectangular cross-section.

Preferably, the cross section of the concave part is in a circular arc shape.

Preferably, the depression depth of the depression is 50-100 mm.

Preferably, the height of the insulating layer is 100-.

Preferably, the adhesive is an epoxy glue.

The liquid cargo protective cover has the beneficial effects that the concave part is arranged at the bottom of the protective cover, the cavity is formed between the concave part and the protective cover, and the protective cover is not in direct contact with a welding line, so that the falling of an insulating layer caused by the expansion caused by heat and the contraction caused by cold of the welding line can be greatly reduced, and the liquid cargo operation safety is ensured.

Drawings

FIG. 1 is a schematic view of the construction of a protective shield bonded at a weld;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is a schematic view of the structure of the welded joint where the insulating layer is installed.

Element number description:

1 outer plate

2 weld seam

3 protective cover

31 recessed part

32 feet

4 adhesive

5 insulating layer

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to limit the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

The invention provides an installation method of an insulating layer at a welding seam of an independent liquid cargo tank, which is mainly applied to a welding seam 2 on an outer plate 1 of the independent liquid cargo tank as shown in figure 1, and comprises the following steps:

s1, manufacturing the protective cover 3 according to design requirements, wherein two support legs 32 are arranged at the bottom of the protective cover 3, a concave part 31 is formed at the bottom of the protective cover 3 between the two support legs 32, preferably, the cross section of the protective cover 3 is rectangular, the cross section of the concave part 31 is arc-shaped and is symmetrical about the welding line 2, the concave depth h2 of the concave part 31 is 50-100mm, and the protective cover 3 can be spaced from the welding line 2 by a sufficient distance in subsequent steps.

S2, as shown in FIG. 2, adhering two support legs 32 to the outer panel 1 on both sides of the welding seam 2 by using an adhesive 4, preferably, the distance L between the support leg 32 and the welding seam 2 is 100-200mm, the adhesive 4 is an epoxy glue, the thickness h1 is 5-15mm, and the adhering width L1 of the support leg 32 and the outer panel 1 is 10-50 mm.

S3, as shown in FIG. 3, an insulating layer 5 with the same height as the protective cover 3 is arranged on the outer surface of the outer plate 1, the insulating layer 5 is arranged by spraying, wherein the height H of the protective cover 3 is the same as the height H of the insulating layer 5, and is 100-450 mm.

Preferably, the protective cover 3 and the insulating layer 5 are made of polyurethane materials, and the polyurethane material density of the protective cover 3 is greater than that of the insulating layer 5, so that the influence of the concave part 31 on the heat preservation performance is reduced, and a better heat preservation effect is achieved.

In conclusion, the liquid cargo protective cover has the advantages that the concave parts are arranged at the bottom of the protective cover, the cavity is formed between the concave parts and the protective cover, and the protective cover is not in direct contact with the welding line, so that the phenomenon that the insulating layer falls off due to expansion caused by heat and contraction caused by cold of the welding line can be greatly reduced, and the liquid cargo operation safety is ensured.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. The installation method of the insulating layer at the welding seam of the independent liquid cargo tank is characterized by comprising the following steps of:

s1, manufacturing a protective cover (3) according to design requirements, wherein two support legs (32) are arranged at the bottom of the protective cover (3), a concave part (31) is formed between the two support legs (32) at the bottom of the protective cover (3) and used for reducing the falling of an insulating layer caused by heat expansion and cold contraction of a welding line, and the protective cover (3) is made of a polyurethane material;

s2, adhering the two support legs (32) to the outer plates (1) on two sides of the welding seam (2) by using an adhesive (4);

and S3, providing an insulating layer (5) with the same height as the protective cover (3) on the outer surface of the outer plate (1).

2. Insulation layer mounting method according to claim 1, characterized in that the insulation layer (5) is spray-formed of a polyurethane material.

3. Insulation layer mounting method according to claim 2, characterized in that the polyurethane material density of the protective cover (3) is greater than the polyurethane material density of the insulation layer (5).

4. Insulation-layer mounting method according to claim 1, characterized in that the recess (31) is symmetrical with respect to the weld seam (2).

5. Insulation blanket installation method according to claim 1, wherein the protective cover (3) has a rectangular cross-section.

6. An insulation-layer mounting method according to claim 5, characterized in that the cross section of the recess (31) is arc-shaped.

7. The insulation layer mounting method as claimed in claim 6, wherein the depression depth of the depression (31) is 50-100 mm.

8. The insulation layer mounting method as claimed in claim 1, wherein the height of the insulation layer (5) is 100-450 mm.

9. Insulation layer mounting method according to claim 1, characterized in that the adhesive (4) is an epoxy glue.