KR200465533Y1 - Connecting structure of transfer pipe for liquefied gas - Google Patents

Abstract

Connection structure for the liquefied gas transfer pipe which detachably connects the transfer pipe installed in the liquefied gas carrier and the transfer hose connected to the transfer pipe for unloading the liquefied gas, at one end there is a first flange detachably connected to the transfer pipe A connecting pipe having a second flange formed at the other end and detachably connected to the transfer hose, an arm hinged to one end of the first flange, and coupled to the other end of the arm to rotate the arm according to the rotation of the arm. A connection structure for a liquefied gas delivery tube is provided that includes a blind flange that opens or closes an end.

Description

CONNECTING STRUCTURE OF TRANSFER PIPE FOR LIQUEFIED GAS}

The present invention relates to a connecting structure for a fluid transfer pipe, and more particularly to a connecting structure for a liquefied gas transfer pipe.

Natural gas and petroleum gas, which are widely used as fuels, are transported in a liquefied gas state in which the volume is reduced through liquefaction for efficient transport.

For example, liquefying natural gas to liquefied natural gas (Liquefied Natural Gas, LNG) reduces its volume to about one-sixth, increasing the amount it can carry at one time. The liquefied natural gas carried to the destination is then regasified and used as fuel.

In order to transport such liquefied gas over a long distance, a liquefied gas carrier equipped with a storage tank capable of storing cryogenic liquids is used. Recently, LNG Floating Production Storage and Offloading (LNG-FPSO) and Floating Liquefied Petroleum Gas Production Storage and Unloading Facilities (LPG-) FPSOs and Floating Storage and Regasification Units (FSRUs) have been developed and used.

The liquefied gas carrier carries the loading and unloading of the liquefied gas by supplying and storing the liquefied gas from the above-described floating facilities or ground facilities and then moving to the demand site to supply the liquefied gas. In this process, a pipeline for liquefied gas is to be connected between the liquefied gas carrier and the ground and floating facilities.

However, the relative position of the liquefied gas carrier and the ground facilities or floating equipment may be continuously changed by the influence of waves, wind and currents. Therefore, a flexible transfer hose that can withstand cryogenic temperatures can be used for connection of the pipeline for the transfer of liquefied gas.

A liquefied gas carrier ship is illustrated in FIG. 1, and a portion indicated by A in FIG. 1 is enlarged in FIG. 2.

Referring to FIG. 1, the hull 11 of the liquefied gas carrier 10 includes a manifold deck 12, a tank dome 13, a transfer pipe 14, and a davit 19. Is installed.

Referring to FIG. 2, the feed pipe 14 is supported on the manifold deck 12 by the support 17. At the end of the transfer pipe 14, a flange 15 is installed, which is connected to the transfer pipe 14 from the outside of the liquefied gas carrier 10, that is, above ground or floating facilities (not shown). May be connected.

In this case, when the specifications of the transfer pipe 14 and the transfer hose (not shown) are different, the transfer hose (not shown) cannot be directly connected to the transfer pipe 14, so that the two can be connected to each other. You can use a structure. A connection structure for a general liquefied gas transfer pipe will be described with reference to FIG. 3.

3 is an exploded perspective view of a connection structure for a general liquefied gas transfer pipe.

Referring to FIG. 3, a typical liquefied gas transfer pipe connection structure includes a connection pipe 20 and a blind flange 30.

First and second flanges 21 and 22 are formed at both ends of the connection pipe 20, respectively.

The first flange 21 is manufactured to be coupled to the flange 15 formed in the transfer pipe 14. That is, the fastening hole 23 corresponding to the position and the number of the fastening holes 16 formed in the flange 15 of the feed pipe 14 is formed in the 1st flange 21.

In addition, the second flange 22 is formed with a fastening hole 24 corresponding to the position and the number of fastening holes (not shown) formed in the flange (not shown) of the transfer hose (not shown) as described above.

After the transfer of the liquefied gas through the transfer hose (not shown) after separating the connecting pipe 20 and the transfer hose (not shown), seawater, rainwater and foreign matter, etc. into the transfer pipe 14 transfer pipe (14) In order to prevent the inflow into the blind flange 30 is combined.

Fastening holes 34 corresponding to the position and number of fastening holes 24 formed in the second flange 22 are formed at the edges of the flange body 31 so that fastening members such as bolts 40 and nuts 41 may be formed. Are combined by. For reference, the transfer pipe 14 and the first flange 21 are also coupled by fastening members such as bolts 40 and nuts 41.

The connecting pipe 20 and the blind flange 30 are mostly made of metal and their weight is considerable. Therefore, the lugs 25 and 35 are formed in the first flange 21 and the flange body 31, respectively, so that a crane (not shown) or davit is used for coupling, detaching, and carrying the connecting pipe 20 and the blind flange 30. (19 in Fig. 1) is used.

The manifold (not shown) on the manifold deck 12 is provided with a plurality of transport pipes (not shown) such as the transport pipe 14 shown. That is, before starting or ending the transfer of the liquefied gas, the coupling pipe 20 and the blind flange 30 are coupled to and separated from each of the transfer pipes (not shown).

Therefore, even when using the davit (19 in Fig. 1) for the connection, separation and transport has a disadvantage in that a lot of time and manpower is required because the work to be connected and disconnected to the lugs (25, 35), respectively.

Embodiments of the present invention seek to facilitate coupling and disengagement of the connector and the blind flange by having the blind flange hinged to the connector.

According to an aspect of the present invention, a liquefied gas transfer pipe connecting structure for detachably connecting the transfer pipe installed in the liquefied gas carrier and the transfer hose connected to the transfer pipe for unloading the liquefied gas, one end of the transfer pipe A first flange which is detachably connected to the first flange, and the other end of which is provided with a second flange having a second flange detachably connected to the transfer hose; An arm hinged to the first flange; And a blind flange coupled to the other end of the arm, the blind flange opening or closing the other end of the connecting pipe according to the rotation of the arm.

When the connecting pipe and the transfer hose are connected, the mirror surface processing portion and the concave-convex portion may be formed at a portion in contact with the end portion of the transfer hose of the second flange. Here, the mirror processing portion and the concave-convex portion may be sequentially arranged in a concentric circle toward the radial direction from the center direction of the connecting pipe.

A support bracket protruding from one of an edge portion of the first flange and one end of the arm, supporting a hinge pin, and having a fixing pin hole formed therein; A hinge head protruding from one of an edge portion of the first flange and one end of the arm and having a hinge pin hole through which the hinge pin penetrates; A fixing bracket protruding from the hinge head and having a fixing hole formed at an end thereof; And a fixing pin inserted into the fixing hole and the fixing pin hole, wherein an angle formed by the arm and the fixing bracket is formed when the arm is rotated so that the blind flange completely opens the other end of the connecting pipe. The fixing pin hole and the fixing hole may have a size arranged in a line.

In addition, the other end of the arm may be coupled to the rear surface of the surface for closing the connecting pipe of the blind flange.

In addition, the diameter of the hinge pin hole may be 2 ± 1mm larger than the diameter of the hinge pin.

Embodiments of the present invention facilitate the coupling and separation of the connection pipe and the blind flange, saving time and manpower required to connect and disconnect the transfer hose to the transfer pipe.

1 is a front view illustrating a liquefied gas carrier ship.
2 is an enlarged view of a portion indicated by A in FIG. 1.
Figure 3 is an exploded perspective view of a connection structure for a general liquefied gas transfer pipe.
Figure 4 is an exploded perspective view of the connecting structure for the liquefied gas transfer pipe according to an embodiment of the present invention.
5 is a plan view of the connecting structure for the liquefied gas transfer pipe according to an embodiment of the present invention.
FIG. 6 is an enlarged view of a portion indicated by B in FIG. 5; FIG.
7 is a plan view of a connecting structure for liquefied gas transfer pipe according to another embodiment of the present invention.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It should be understood, however, that the intention is not to limit the invention to the particular embodiments, but to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. In describing the present invention, when it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is an exploded perspective view of the connecting structure for the liquefied gas transfer pipe according to an embodiment of the present invention.

Referring to Figure 4, the liquefied gas transfer pipe connecting structure 100 according to an embodiment of the present invention includes a connection pipe 110, a blind flange 130 and an arm 132 connected to the transfer pipe (14). Can be.

As described above, the connection structure 100 for the liquefied gas transport pipe according to an embodiment of the present invention is the transport pipe 14 and the liquefied gas transport ship (10) installed in the liquefied gas carrier ship (10) Removably connects a transfer hose (not shown) connected to the transfer pipe 14 from the outside of 10).

Since the transfer pipe 14, the flange 15 and the fastening hole 16 formed in the transfer pipe 14 have been described above, overlapping descriptions are omitted.

The connector 110 may include a hollow tube-shaped connector tube body 111, a first flange 112 formed at one end of the connector tube body 111, and a second flange 113 formed at the other end thereof.

A pair of support brackets 122 and 123 may protrude from the edge portion of the first flange 112. A hinge pin hole 124 is formed in the support bracket 122, and a hinge pin hole is formed in the other support bracket 123 although not indicated by a separate sign. A fixing pin hole 125 is formed in the support bracket 122, which will be described below with reference to FIG.

The lug 116 may protrude from the edge of the first flange 112.

The first flange 112 has a position and number of fastening holes 16 formed in the flange 15 of the transfer pipe 14 so that the connection pipe 110 can be detachably connected to the transfer pipe 14. A corresponding plurality of fastening holes 114 are formed.

Although not shown, a fastening member such as the bolt 40 and the nut 41 shown in FIG. 3 may be separated from the fastening hole 16 of the flange 15 and the fastening hole 114 of the first flange 112. When coupled so as to, the flange 15 and the first flange 112 can be detachably connected.

A plurality of fastening holes 115 are also formed in the second flange 113. The fastening hole 115 is formed to correspond to the position and number of fastening holes (not shown) formed in the flange (not shown) of the transfer hose (not shown), so that the connection pipe 110 is detached from the transfer hose (not shown). Make the connection possible.

The blind flange 130 may include a flange body 131 and a handle 137. A plurality of fastening holes 134 are formed in the flange body 131 to correspond to the positions and the numbers of the plurality of fastening holes 115 formed in the second flange 113. The lug 135 may protrude from one edge of the flange body 131.

A hinge head 133 is formed at one end of the arm 132, and a hinge pin hole 136 through which the hinge pin 120 penetrates is formed in the hinge head 133. The other end of the arm 132 is coupled to the blind flange 130, ie the edge of the flange body 131.

The hinge head 133 is disposed between the pair of support brackets 122 and 123 protruding from the first flange 112. At this time, the hinge head 133 is arranged such that the hinge pin hole 124 of the support bracket 122 and the hinge pin hole 136 of the hinge head 133 are arranged in a row, and then the hinge pin 120 is hinge pin hole 124. When coupled to penetrate through 136, the arm 132 is hinged to the first flange 112.

The hinge pins 120 are supported at both ends by a pair of support brackets 122 and 123, and the hinge heads 133 are rotatably coupled to the intermediate region of the hinge pins 120. The hinge pin 120 may be coupled to the fixing member 121 to prevent the hinge pin 120 from being separated from the support brackets 122 and 123.

Therefore, when the arm 132 rotates about the hinge pin 120, the blind flange 130 coupled to the arm 132 also rotates with respect to the connecting pipe (110). At this time, the length of the arm 132 is formed so that the blind flange 130 can open or close the other end of the connecting pipe 110 as the arm 132 rotates.

That is, one side of the flange body 131 is moved to a position that can be coupled to the second flange 113 according to the rotation of the arm 132 so that the other end of the connecting pipe 110 is closed by the blind flange 130. Alternatively, the flange body 131 may be sufficiently spaced apart from the second flange 113 so that the other end of the connecting pipe 110 is completely opened.

The reason why one end of the arm 132 is hinged to the first flange 112 is because a transfer hose (not shown) is to be connected to the second flange 113. That is, since a fastening member and a traction device for closely contacting and coupling the second flange 113 and the transfer hose (not shown) are coupled to or attached to the edge portion of the second flange 113, the second flange 113 is connected to the second flange 113. This is because a member for hinge engagement is difficult to form or attach.

When one surface of the flange body 131 is moved to a position where it can be coupled to the second flange 113, the second flange (using a fastening member such as a bolt (40 in FIG. 1) and a nut (41 in FIG. 1) is used. The blind flange 130 may be coupled to 113 to close the other end of the connection pipe 110.

This is to prevent rainwater, seawater and foreign substances, etc. through the other open end of the connection pipe 110 when the transfer hose (not shown) is not connected to the connection pipe 110 as described above. It is for. In this case, a gasket (160 of FIG. 5) may be interposed between the second flange 113 and the blind flange 130 to increase the sealing property. This will be described with reference to FIG. 5.

In addition, reference numerals such as the fixing pin 140, the loss preventing member 141, the fixing bracket 142, and the fixing hole 143 will be described with reference to FIG. 5.

5 is a plan view of the connecting structure for the liquefied gas transfer pipe according to an embodiment of the present invention.

Referring to FIG. 5, when the blind flange 130 closes the other end of the connection pipe 110 according to the rotation of the arm 132, the state when the blind flange 130 is closed is represented by a solid line, and the state when the arm 132 is opened as a dashed chain line. Is illustrated.

As described above, when a transfer hose (not shown) is connected to the connection pipe 110, since the second flange 113 must be coupled to an end of the transfer hose (not shown), the blind flange 130 is connected to the connection pipe ( 110 and a sufficient distance from the second flange 113 so as not to interfere with the connection of the transfer hose (not shown).

For reference, the connecting structure 100 for the liquefied gas transfer pipe according to an embodiment of the present invention illustrates that the first flange 112 and the second flange 113 is connected to the fastening member such as bolts and nuts. will be. Although not shown, the second flange 113 is pulled toward the end of the transfer hose (not shown) by using a plurality of towing rings (not shown) operated by hydraulic pressure according to the type of the transfer hose (not shown). By closely contacting, a connection pipe 110 and a transfer hose (not shown) may be used in such a manner as to detachably connect. In this case, the fastening member as described above may not be used.

As such, various methods may be used to connect the connection pipe 110 and the transfer hose (not shown), but the blind flange 130 may be used to secure a space required for the connection work, a movement path of the equipment, and the tool. It is necessary to be sufficiently spaced apart from the second flange 113 and to maintain the spaced apart state.

However, as described above, the hull (see 11 in FIG. 1) may be shaken by the influence of wind, waves, and currents. If the blind flange 130 is moved in the direction of the second flange 113 by this shaking, it may cause a problem in the connection of the connector 110 and the transfer hose (not shown), or the blind flange 130 and the transfer hose (not shown). C) may collide and the transfer hose (not shown) may be damaged.

Therefore, the fixing pin 140 may be utilized to maintain the connection pipe 110 sufficiently spaced apart from the blind flange 130. This will be described in more detail with reference to FIGS. 4 and 5 as follows.

A fixing bracket 142 is protruded from one side edge portion of the hinge head 133, and a fixing hole 143 is formed at an end of the fixing bracket 142. Here, the fixing bracket 142 forms a predetermined angle with the arm 132 about the hinge pin 120.

The position of the arm 132 when the blind flange 130 closes the other end of the connecting pipe 110 is referred to as the first position, and the blind flange 130 is connected to the connecting pipe 110 and the transfer hose (not shown). The position of the arm 132 when sufficiently spaced apart from the second flange 113 so as not to interfere with the connection of is referred to as a second position.

The predetermined angle is an angle at which the fixing bracket 142 is disposed in parallel with the support bracket 122 when the arm 132 is in the second position, and the fixing hole 143 from the central axis of the hinge pin 120. When the distance from the center of the hinge pin 120 to the center of the fixing pin hole 125 is equal to the distance from the center of the hinge pin 120, the fixing pin hole 125 and the fixing pin when the arm 132 is rotated to the second position. The holes 143 are arranged in a line.

In this case, when the fixing pin 140 is inserted to penetrate the fixing pin hole 125 and the fixing hole 143, the arm 132 is fixed at the second position so that the hinge pin 120 does not rotate about the hinge pin 120.

That is, the angle formed by the arm 132 and the fixing bracket 142 is fixed pin hole 125 and when the arm 132 is rotated so that the blind flange 130 is completely open to the other end of the connecting pipe 110 When the fixing holes 143 have a size arranged in a row, the fixing pin 140 may be used to maintain the second position of the arm 132.

Connection structure for the liquefied gas transfer pipe 100 according to an embodiment of the present invention having a structure as described above is easy to open and close the other end of the connection pipe (110).

That is, when removing the blind flange 130 from one end of the connecting pipe 110 in order to connect the transfer hose (not shown), such as bolts (see 40 in Figure 3) and nuts (see 41 in Figure 3) After removing the member, one end of the connection pipe 110 may be opened by pulling the handle 137. In this case, the fixing pin 140 may be used to prevent rotation of the arm 132.

On the contrary, when the blind flange 130 is coupled to close the other end of the connecting pipe 110, the fixing pin 140 is separated from the fixing pin hole 125 and the fixing hole 143, and the arm 132 rotates. The blind flange 130 is moved to make contact with the second flange 113 at the other end of the connecting pipe 110, and then the second flange 113 and the blind flange 130 are coupled with the fastening member as described above. At this time, the gasket 160 may be interposed between the two in order to improve the sealing property as described above.

As such, since the davit (19 of FIG. 1) is not used for the operation of separating and coupling the blind flange 130 from the second flange 113 of the connecting pipe 110, the transfer hose (not shown) is detached. Save time and manpower.

In addition, since the blind flange 130 is not completely separated from the connecting pipe 110 when the blind flange 130 is separated from the second flange 113, an accident due to the drop of the blind flange 130 is reduced, and the blind flange Since the 130 does not need to be mounted on the manifold deck (see 12 in FIG. 1), it is advantageous to secure the worker's copper wire for the detachment operation of the transfer hose (not shown).

For reference, the lug 135 formed at one edge of the flange body 131 is formed for an emergency, such as when the blind flange 130 is separated from the connecting pipe 110 due to breakage of the hinge pin 120 or the like. .

And, the anti-lost member 141 is to prevent the loss of the fixing pin 140, one end is coupled to the fixing pin 140, the other end may be coupled to the arm 132. As the anti-lost member 141, various flexible members such as a chain, a rubber band, and a strap may be used.

On the other hand, the depression 117 may be formed in the middle region of the connector tube body 111. The depression 117 is a portion for fastening a fixing device (not shown) for a rigid connection of the transfer hose (not shown) when connecting the transfer hose (not shown) to the connector 110.

FIG. 6 shows an enlarged view of the portion indicated by B in FIG. 5.

Referring to FIG. 6, a mirror surface processing portion 118 and an uneven portion 119 may be formed at a portion of the second flange 113 that is in contact with a blind flange (130 of FIG. 4) or a transfer hose (not shown).

Here, mirror processing means that the surface roughness is processed to be low and flat, and that the surface is processed to a degree similar to the mirror surface. Therefore, the mirror surface processing unit 118 may be a portion where the surface roughness is very low and processed flat. Concave-convex portion 119 is a portion in which a plurality of concave-convex is formed on the surface of the second flange 113, a plurality of concave-convex may be formed concentrically around the central axis of the connector tube body (111).

And, as shown, the mirror surface processing unit 118 and the concave-convex portion 119 may be sequentially arranged in a concentric circle toward the radial direction from the central axis direction of the connector tube body 111.

Therefore, as described above, when the transfer hose (not shown) pulls the end of the transfer hose (not shown) to the second flange 113 by using a plurality of traction rings (not shown) operated by hydraulic pressure. The sealing property between the end of the transfer hose (not shown) and the second flange 113 may be improved by the mirror processing unit 118. Alternatively, when a gasket (not shown) is used between the end of the transfer hose (not shown) and the second flange 113, the sealing property may be improved by the uneven portion 119.

Referring back to FIG. 5, when the blind flange 130 remains coupled to the connection pipe 110 for a long time for distant transportation of liquefied gas, the gasket 160 includes the second flange 113 and the flange body. In close contact with the 131, the blind flange 130 may not be easily separated from the connection pipe 110.

In addition, the spacing between the plurality of transfer pipes (see 14 in FIG. 1) installed on the manifold deck (see 12 in FIG. 1) is insufficient, or sufficient rotation of the blind flange 130 to secure a working space. Even if the radius is not secured, the blind flange 130 may not be easily separated from the connector 110.

In the case described above, the blind flange 130 can be easily moved from the connecting pipe 110 by allowing the blind flange 130 to move somewhat in the direction of the center axis of the connecting pipe main body 111 with respect to the second flange 113. Can be dislodged.

To this end, the diameter of the hinge pin hole (136 of FIG. 4) is formed to be larger than the diameter of the hinge pin 120 by about 2 ± 1mm to have a gap (裕 隔).

On the other hand, when it is easy to secure a working space for the connection of the transfer hose (not shown), the blind flange 130 may have a sufficient radius of rotation, it can be easily separated from the connecting pipe (110). This will be described with reference to FIG. 7.

7 is a plan view of the connecting structure for the liquefied gas transfer pipe according to another embodiment of the present invention.

Referring to FIG. 7, the connection structure 200 for the liquefied gas delivery pipe according to another embodiment of the present invention may include a connection pipe 210, an arm 232, and a blind flange 230.

The connector 210 may include a connector body 211, a first flange 212, a second flange 213, and a lug 216, which are connected to the liquefied gas transfer pipe according to an embodiment of the present invention. Since the connection pipe main body 111, the 1st flange 112, the 2nd flange 113, and the lug 116 of the structure 100 are respectively the same, overlapping description is abbreviate | omitted.

In addition, the blind flange 230 may include a flange body 231, the lug 235 and the handle 237, these are the flange body of the connection structure 100 for the liquefied gas transfer pipe according to an embodiment of the present invention ( 131, the lug 135, and the handle 137, respectively, are the same as the description thereof will be omitted.

A support bracket 222 may protrude from one side of the first flange 212. One end of the arm 232 may be rotatably hinged to the support bracket 222 by the hinge pin 220.

The first refraction portion 232a and the second refraction portion 232b may be extended to the other side of the arm 232. The first refracting portion 232a extends in a direction different from one side of the arm 232 and the second refracting portion 232b extends in a direction different from the first refracting portion 232a, and the other end of the arm 232 is provided. That is, the end of the second refraction portion 232b is coupled to one surface of the flange body 231 of the blind flange 230.

At this time, one surface of the flange body 231 to which the other end of the arm 232 is coupled is the rear surface of the surface where the blind flange 230 closes the connection pipe 210, that is, the surface contacting the second flange 213 ( Refers to the surface.

Therefore, the liquefied gas transfer pipe connecting structure 200 according to another embodiment of the present invention is increased in distance between both ends of the arm 232 compared to the liquefied gas delivery pipe connecting structure 100 according to an embodiment of the present invention. As a result, the radius of rotation of the blind flange 230 is increased.

Therefore, even when the blind flange 230 and the connection pipe 210 are in close contact by the gasket 260, the blind flange 230 can be easily separated from the connection pipe 210 by pulling the handle 237.

Here, the second flange 213 and the flange body 231 may be detachably coupled to a fastening member such as a bolt (see 40 of FIG. 3) and a nut (see 41 of FIG. 3). Therefore, the second refraction portion 232b may be manufactured to form the interval d between the first refraction portion 232a and the flange body 231 to perform the fastening operation.

Although the connection structure for the liquefied gas transfer pipe according to the embodiment of the present invention has been described above, the idea of the present invention is not limited to the embodiments presented herein, and those skilled in the art to understand the idea of the present invention have the same scope of the idea. Within the scope of the present invention, other embodiments may be easily proposed by adding, changing, deleting, and adding components, but this will also fall within the spirit of the present invention.

100: connecting structure for liquefied gas transfer pipe 110: connector
112: first flange 113: second flange
118: mirror processing 119: uneven portion
120: hinge pin 122, 123: support bracket
124: hinge pin hole 125: fixed pin hole
130: blind flange 131: flange body
132: arm 133: hinge head
136: hinge pin hole 140: fixed pin
142: fixing bracket 143: fixing hole

Claims (6)

As a connection structure for the liquefied gas transfer pipe for detachably connecting the transfer pipe installed in the liquefied gas carrier ship and the transfer hose connected to the transfer pipe for unloading the liquefied gas,
A first flange having a first flange detachably connected to the transfer pipe at one end thereof, and a second flange having a second flange detachably connected to the transfer hose at the other end thereof;
An arm hinged to one end of the first flange; And
And a blind flange coupled to the other end of the arm, the blind flange opening or closing the other end of the connection pipe as the arm rotates.
The method of claim 1,
When the connecting pipe and the transfer hose is connected, the connecting structure for the liquefied gas transfer pipe, characterized in that the mirror surface processing portion and the concave-convex portion is formed in the portion in contact with the end of the transfer hose of the second flange.
The method of claim 2,
The mirror surface processing portion and the concave-convex portion connecting structure for a liquefied gas transfer pipe, characterized in that arranged in a concentric circle in a radial direction from the direction of the central axis of the connecting pipe.
The method of claim 2,
A support bracket protruding from one of an edge portion of the first flange and one end of the arm, supporting a hinge pin, and having a fixing pin hole formed therein;
A hinge head protruding from one of an edge portion of the first flange and one end of the arm and having a hinge pin hole through which the hinge pin penetrates;
A fixing bracket protruding from the hinge head and having a fixing hole at an end thereof; And
A fixing pin inserted into the fixing hole and the fixing pin hole,
The angle formed by the arm and the fixing bracket has a size in which the fixing pin holes and the fixing holes are arranged in a line when the arm is rotated such that the blind flange completely opens the other end of the connecting pipe. Connecting structure for liquefied gas transfer pipe.
The method according to any one of claims 1 to 4,
The other end of the arm is connected to the rear surface of the surface for closing the connecting pipe of the blind flange, liquefied gas transfer pipe connecting structure.
The method according to any one of claims 1 to 4
The hinge pin hole diameter is 2 ± 1mm larger than the diameter of the hinge pin connection structure for a liquefied gas transfer pipe.

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