JP2017116061A - Removal method for storage inside nozzle pipe, and split type flange - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a removal method for a storage inside a nozzle pipe capable of preventing jetting of dangerous gas to enable safe construction, without attaching a valve, and a split type flange.SOLUTION: A removal method for a storage inside a nozzle pipe employs means of arranging a first seal material 40 on a split surface 2 of a pair of split flanges 1 configured to hold a plurality of suspended inner pipe members 111, and arranging a second seal material on an attachment surface of the pair of split flanges attached to an end part of a nozzle pipe, in step of holding the inner pipe members 111 with the pair of split flanges 1 to support them at the end part of the nozzle pipe.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a method for removing nozzle tube internals and a split flange.

  Patent Document 1 listed below discloses a tank accessory replacement device used in maintenance and inspection work for a hazardous material storage tank that stores flammable gas, toxic gas, or the like. This tank accessory replacement device is used, for example, when removing a failed capacitive liquid level gauge in a liquefied natural gas (LNG) storage tank. The capacitance-type liquid level gauge has a guide pipe (nozzle pipe) inserted into the tank and a liquid level sensor (accommodated object) accommodated inside the nozzle pipe. The level gauge sensor is a plurality of units composed of an inner pipe member having a flange, and a plurality of the level gauge sensors are connected in series according to the height of the tank.

  Conventionally, when removing a liquid level sensor (container), first, a cylindrical seal device (glove box chamber) is attached so as to surround an end portion of a guide tube. Next, a valve having an opening area through which the liquid level sensor can pass is attached to the upper part of the cylindrical seal device, and a cylindrical shape having a sealed space in which at least one unit of the liquid level sensor can be accommodated at the upper part of the valve Install the replacement cylinder (pipe chamber). Inside the replacement cylinder, there is a wire rope and hook that pulls up the level gauge sensor. After the unit of the level gauge sensor is lifted and accommodated in the replacement cylinder, the valve is closed to form a cylindrical shape. The level gauge sensor can be taken out from the replacement tube in a state where the seal device is cut off.

Japanese Patent Laid-Open No. 1-23392

  In the above prior art, a valve is attached to the upper part of the cylindrical sealing device and can be cut off from the replacement cylinder. However, the cylindrical sealing device needs to support the load of the valve. A valve | bulb is a large sized thing which has an opening area which can pass a liquid level sensor, for example, is about 200 kg. For this reason, strength is required for the cylindrical sealing device, the weight is increased, and there is a problem in construction in assembling and the like.

  The present invention has been made in view of the above problems, and provides a method for removing the internal contents of a nozzle tube and a split flange that can be safely constructed by preventing ejection of hazardous gas without attaching a valve. Objective.

  In order to solve the above-mentioned problem, the present invention is a method for removing the internal contents of a nozzle tube for removing the internal contents of the nozzle tube, and the stored contents are detachably connected via a flange. A first step of including a plurality of inner pipe members and setting a chamber so as to surround the end of the nozzle pipe; and lifting the plurality of inner pipe members through the end of the nozzle pipe; A second step of accommodating at least one of the plurality of inner tube members; a third step of sandwiching the plurality of suspended inner tube members between a pair of split flanges and supporting the end portions of the nozzle tubes; A fourth step of removing the inner pipe member connected above the inner pipe member sandwiched between the pair of split flanges among the plurality of inner pipe members, and in the third step, The pair of sandwiching the inner pipe member With arranging the first sealing member in the split surface of the split flange, placing a second sealing member to the mounting surface of the pair of split molds flange attached to the end of the nozzle tube, to adopt a means of.

  In the present invention, the split surface includes a curved surface along the outer peripheral surface of the inner tube member, and a plane serving as a mating surface of the pair of split mold flanges. Separately from the pair of split flanges, the cylindrical seal portion is attached to the outer peripheral surface of the inner pipe member, and comes into contact with the curved surface when the inner pipe member is sandwiched between the pair of split flanges, and the pair of split flanges And a plate-like seal portion attached in advance to the flat surface of the mold flange.

  In the present invention, a means is adopted in which the plate-like seal portion is screwed to the flat surface.

  Moreover, in this invention, the said plate-shaped seal part employ | adopts the means that it has a counterbore which arrange | positions a screw in the position deeper than a sealing surface.

  Moreover, in this invention, the said cylindrical seal part employ | adopts the means that it has the cut | interruption formed from one end to the other end.

  Moreover, in the present invention, it is a split mold flange having a split surface including a plane that becomes a mating surface and a curved surface that is recessed from the plane, and a plate-like seal portion is attached to the plane. Adopt means.

In the present invention, after accommodating at least one of the plurality of inner tube members accommodated in the nozzle tube in a chamber installed so as to surround the end portion of the nozzle tube, the plurality of inner tube members are divided into a pair. It is sandwiched between mold flanges and supported at the end of the nozzle tube. At this time, the first seal material is disposed on the split surfaces of the pair of split mold flanges sandwiching the inner pipe member, and the second seal material is disposed on the mounting surfaces of the pair of split mold flanges attached to the end portions of the nozzle pipe. Therefore, it is possible to prevent the ejection of dangerous gas from the gap between the inner pipe member and the pair of split flanges and the gap between the pair of split flanges and the end of the nozzle pipe.
Therefore, in the present invention, without attaching a valve to the chamber, the inner pipe member is connected above the inner pipe member sandwiched between the pair of split flanges in a state of being cut off from the inside of the nozzle pipe. The inner pipe member can be safely removed.

It is a top view of the split flange in the embodiment of the present invention. It is a front view which shows the split surface of the split-type flange in embodiment of this invention. It is arrow AA sectional drawing of FIG. It is the (a) top view of the cylindrical seal part 43 arrange | positioned on the split surface of a pair of split-type flange in embodiment of this invention, (b) It is a right view. It is a top view when combining a pair of split-type flange in embodiment of this invention. It is a figure which shows the 1st process of the removal construction method of the nozzle pipe internal accommodation thing in embodiment of this invention. It is a figure which shows the 2nd process and 3rd process of the removal construction method of the nozzle pipe internal accommodation in embodiment of this invention. It is a figure which shows the 4th process of the removal construction method of the nozzle pipe internal accommodation in embodiment of this invention. It is a figure which shows the 2nd process repeated after the 4th process of the removal method of the nozzle pipe internal accommodation in embodiment of this invention. It is a longitudinal cross-sectional view which shows the principal part of the tank in embodiment of this invention.

  The removal method (hereinafter referred to as this method) of the nozzle pipe internal contents and the split flange according to the embodiment of the present invention will be described with reference to the drawings.

First, the outline of the tank 100 to which the present technique is applied will be described with reference to FIG.
FIG. 10 is a longitudinal sectional view showing a main part of the tank 100 in the embodiment of the present invention.
The tank 100 is a tank that stores liquefied natural gas (hereinafter referred to as LNG), and is filled with a combustible gas (such as CH ₄ ) vaporized by LNG. The tank 100 includes a nozzle pipe 101 provided through the tank roof at the landing 105 at the top of the tank, and a liquid level accommodated inside the nozzle pipe 101 in order to measure the liquid level height of the LNG inside. And a meter sensor 110 (container).

  A flange 101a is provided at the upper end of the nozzle tube 101, and an adapter tube 102 is attached via the flange 101a. A connector pipe 103 is attached to the upper part of the adapter pipe 102. A transmission cable 104 that transmits liquid level measurement data to a control room (not shown) is connected to the connector tube 103.

  The level gauge sensor 110 has a plurality of inner tube members 111 that are detachably connected via a flange 111a, one end connected to each of the plurality of inner tube members 111, and the other end connected to the transmission cable 104. Cable 112. The cable 112 transmits measurement data of capacitance that changes due to the presence of LNG between the inner tube member 111 and the nozzle tube 101. An eye nut 111 b is attached to the uppermost inner tube member 111 among the plurality of inner tube members 111.

Next, with reference to FIGS. 1-5, the structure of the split flange 1 used for this method is demonstrated.
FIG. 1 is a plan view of a split flange 1 according to an embodiment of the present invention. FIG. 2 is a front view showing a split surface 2 of the split flange 1 in the embodiment of the present invention. 3 is a cross-sectional view taken along the line AA in FIG. FIGS. 4A and 4B are a plan view and a right side view of the cylindrical seal portion 43 disposed on the split surface 2 of the pair of split flanges 1 in the embodiment of the present invention. FIG. 5 is a plan view when a pair of split flanges 1 are combined in the practice of the present invention.

As shown in FIG. 1, the split flange 1 is a lid that is divided into substantially semicircular arcs. The split flange 1 includes a lid body 10, a rib 20, and a support support 30.
The lid body 10 is a plate formed in a substantially semicircular arc shape. A plurality of through holes 11 are formed in the outer peripheral edge of the lid body 10 at intervals in the circumferential direction. Bolts 52 for attaching the split flange 1 are inserted into the flange 101a of the nozzle tube 101 shown in FIG. 1 (see FIG. 5).

  As shown in FIG. 1, the rib 20 is a plate joined to the lid body 10 along the split surface 2 of the split flange 1. The rib 20 is erected with respect to the lid body 10. As shown in FIGS. 1 and 2, a plurality of through holes 21 are formed in the rib 20 at intervals in the longitudinal direction. As shown in FIG. 5, when the inner pipe member 111 is sandwiched between the pair of split flanges 1, bolts 50 for combining the pair of split flanges 1 are inserted into the through holes 21. The direction of the bolt 50 is changed on the left and right so that the nut 51 can be easily turned with the right hand. That is, on the left half surface of the pair of split mold flanges 1, the nut 51 is arranged on the lower side in FIG. 5 (on the right hand side of the operator), and on the right half surface of the pair of split flanges 1, the nut 51 is arranged. Is disposed on the upper side of the drawing (on the right hand side of the operator) in FIG.

  As shown in FIG. 1, the support support 30 is a plate joined to the lid body 10 on the back side of the rib 20. The support support 30 is erected with respect to the lid body 10. As shown in FIG. 5, the support support 30 is disposed at a position where it can contact the lower surface of the flange 111 a of the inner pipe member 111 when the inner pipe member 111 is sandwiched between the pair of split flanges 1.

As shown in FIG. 1, the split mold flange 1 includes a split surface 2 including a flat surface 2 a serving as a mating surface and a curved surface 2 b that is recessed from the flat surface 2 a.
The curved surface 2b is formed in the semicircular arc shape along the outer peripheral surface of the inner pipe member 111, as shown in FIG. The radius of curvature of the curved surface 2 b is slightly larger than the radius of the outer peripheral surface of the inner tube member 111 and smaller than the radius of the flange 111 a of the inner tube member 111.

  The plane 2a is formed on both sides of the curved surface 2b. As shown in FIGS. 1 and 2, a plate-like seal portion 41 is attached to the plane 2 a. The plate-like seal portion 41 is a seal rubber and constitutes the first seal material 40 together with a cylindrical seal portion 43 described later. As shown in FIG. 2, a plurality of through holes 41 a 1 are formed in the seal surface 41 a of the plate-like seal portion 41. The through hole 41a1 has a position and a size capable of communicating with the through hole 21 of the rib 20.

  The plate-shaped seal portion 41 is screwed to the rib 20 by screws 42 arranged between adjacent through holes 41a1. As shown in FIG. 3, the plate-like seal portion 41 has a counterbore 41 a 2 in which the screw 42 is disposed at a position deeper than the seal surface 41 a. The screw 42 of the present embodiment is a countersunk screw, and the counterbore 41a2 is formed in a conical shape corresponding to the head part of the countersunk screw. The size (depth) of the spot facing 41a2 is designed according to the crushing allowance of the plate-like seal portion 41. Note that the plate-like seal portion 41 is attached to the flat surface 2a using not only the screw 42 but also an adhesive in order to prevent dropping.

  As shown in FIG. 5, the cylindrical seal portion 43 is a seal rubber sandwiched between the split surfaces 2 of the pair of split mold flanges 1 that sandwich the inner pipe member 111. 1 is not attached. That is, the cylindrical seal portion 43 is attached to the outer peripheral surface of the inner tube member 111 separately from the pair of split flanges 1, and abuts against the curved surface 2 b when the inner tube member 111 is sandwiched between the pair of split flanges 1. Is. That is, the curved surface 2b is difficult to form the screw hole 22 (see FIG. 3) like the flat surface 2a, is difficult to screw, and there is a concern that the sealing material may fall with only the adhesive. .

  As shown in FIG. 4A, the cylindrical seal portion 43 has a cut 43a and a fall prevention piece 43b. The cut 43a is formed from one end 43A to the other end 43B of the cylindrical seal portion 43 as shown in FIG. The cut 43a of the present embodiment is formed in a puzzle shape (ant groove shape) in which concaves and convexes are combined at the central portion in the longitudinal direction of the cylindrical seal portion 43. The fall prevention piece 43 b is provided so as to protrude in the radial direction from the outer peripheral surface of one end 43 </ b> A of the cylindrical seal portion 43. The fall prevention piece 43b is formed with a through hole 43b1 capable of securing a fall prevention rope.

  As shown in FIG. 5, the cylindrical seal portion 43 is sandwiched between the split surfaces 2 of the pair of split mold flanges 1 with the fall prevention piece 43 b placed on the rib 20. A rope (not shown) secured to the fall prevention piece 43b is secured to an appropriate portion of a chamber 60 (see FIG. 6) described later. Thereby, dropping of the cylindrical seal part 43 is prevented.

The split flange 1 has a mounting surface 3 shown in FIG. 2 and can be mounted on the flange 101 a of the nozzle tube 101. The mounting surface 3 is formed with the plurality of through holes 11 described above. A step 3 a is formed on the bottom surface of the lid body 10. The step 3 a is a positioning groove for arranging a second sealing material 90 (see FIG. 7), which will be described later, along the mounting surface 3.
In addition, since the split-type flange 1 of the said structure repeats attachment / detachment in this method mentioned later, it is preferable to use the volt | bolts 50 and 52 shown in FIG. 5 as machine bolts.

Subsequently, the procedure (process) of the present method will be described with reference to FIGS.
Drawing 6 is a figure showing the 1st process of the removal construction method of the nozzle pipe internal contents in the embodiment of the present invention. Drawing 7 is a figure showing the 2nd process and the 3rd process of the removal construction method of the nozzle pipe internal contents in the embodiment of the present invention. Drawing 8 is a figure showing the 4th process of the removal construction method of the nozzle pipe internal contents in the embodiment of the present invention. Drawing 9 is a figure showing the 2nd process repeated after the 4th process of the removal construction method of the nozzle pipe internal contents in the embodiment of the present invention.

  In this method, after the connector tube 103 and the adapter tube 102 shown in FIG. 10 are removed, the chamber 60 is installed so as to surround the end of the nozzle tube 101 as shown in FIG. 6 (first step). The chamber 60 includes a glove box chamber 61 and a pipe chamber 62. First, the glove box chamber 61 is airtightly attached to the outer peripheral surface of the nozzle tube 101 via a sealing material (not shown) to form a working space. The working space of the glove box chamber 61 accommodates the working tool, the above-described split flange 1 and the like.

  On the side surface of the glove box chamber 61, a glove 62a is attached inward and airtight. Furthermore, a peep window 63 for internal inspection is provided on the side surface of the glove box chamber 61. Further, a flange 64 for attaching the pipe chamber 62 in an airtight manner is provided on the upper surface of the glove box chamber 61. The glove box chamber 61 has purge means (not shown) that can replace the inside with an inert gas atmosphere (for example, a nitrogen gas atmosphere).

  Next, the pipe chamber 62 is hermetically attached to the flange 64 of the glove box chamber 61 to form an accommodation space in which at least one of the inner pipe members 111 can be accommodated. A wire rope 65 for lifting the inner pipe member 111 is disposed inside the pipe chamber 62. The upper end of the pipe chamber 62 is closed by a lid 66. The lid 66 is provided with a wire seal member 66a for allowing the wire rope 65 to pass therethrough. On the other hand, a flange 67 is provided at the lower end of the pipe chamber 62 and is connected to the flange 64 of the glove box chamber 61 without a valve.

  A suspension frame 70 is installed at the landing 105. A plurality of geared trolleys 71 are suspended from the suspension frame 70. A winch 72 capable of winding up the wire rope 65 is supported on the geared trolley 71 directly above the pipe chamber 62. A chain block 73 that receives the load of the pipe chamber 62 is supported on the geared trolleys 71 on both sides of the pipe chamber 62.

  A lifting balance 80 is attached to the lower end of the wire rope 65. The balance 80 is attached in advance to the lower end of the wire rope 65 before connecting the pipe chamber 62 to the glove box chamber 61. Next, the lifting jig 81 is inserted into the nozzle tube 101 and hooked on the eye nut 111 b of the inner tube member 111. When one end of the lifting jig 81 is hooked on the inner tube member 111 side, the other end of the lifting jig 81 is secured to the eye nut on the lower surface of the balance 80. The second lifting jig 81 is secured to a diagonal position.

  Next, in this method, as shown in FIG. 7, the plurality of inner tube members 111 are lifted through the end portion of the nozzle tube 101, and at least one of the plurality of inner tube members 111 is accommodated in the chamber 60. (Second step). Then, the plurality of suspended inner pipe members 111 are sandwiched between the pair of split flanges 1 and supported on the end of the nozzle pipe 101 (third step). Specifically, the plurality of inner pipe members 111 are lifted by one unit via the wire rope 65, and the split flange 1 is interposed between the flange 111a at the upper end of the second stage inner pipe member 111 and the flange 101a of the nozzle pipe 101. Is inserted, and the load of the plurality of inner tube members 111 is supported at the end of the nozzle tube 101 via the split flange 1.

  In the third step, the first sealing material 40 is disposed on the split surface 2 of the pair of split mold flanges 1 that sandwich the inner pipe member 111, and the pair of split mold flanges 1 attached to the ends of the nozzle pipe 101 are used. A second sealing material 90 is disposed on the mounting surface 3. Specifically, first, the cylindrical seal portion 43 shown in FIG. 4 is attached to the outer peripheral surface of the second-stage inner tube member 111 suspended in the second step. The cylindrical seal portion 43 has a cut 43a formed from one end 43A to the other end 43B. For this reason, the cylindrical seal | sticker part 43 can be expand | deployed from a cylinder to a sheet | seat body by opening the cut 43a. By deploying the cylindrical seal portion 43 in this way, the outer peripheral surface of the inner tube member 111 can be easily covered from the side, and the workability in the limited working space of the glove box chamber 61 is improved. .

  Next, as shown in FIG. 5, the second-stage inner pipe member 111 to which the cylindrical seal portion 43 is attached is sandwiched between the pair of split flanges 1. Specifically, the inner pipe member 111 is sandwiched between a pair of split flanges by inserting bolts 50 into the plurality of through holes 21 formed in the rib 20 and tightening with the nuts 51. The tubular seal portion 43 abuts against the curved surface 2b when the inner tube member 111 is sandwiched between the pair of split flanges 1, thereby sealing the gap between the outer peripheral surface of the inner tube member 111 and the curved surface 2c in an airtight manner. In addition, a plate-like seal portion 41 is attached in advance to the flat surface 2a serving as the mating surface, and when the inner tube member 111 is sandwiched between the pair of split flanges 1, the seal surfaces 41a abut each other, A gap between the split surfaces 2 of the pair of split flanges 1 is hermetically sealed.

  Since the plate-like seal portion 41 is attached in advance to the flat surface 2 a serving as a mating surface, the work of arranging the seal material like the cylindrical seal portion 43 can be saved. As shown in FIG. 3, the plate-like seal portion 41 is screwed to the flat surface 2a. Unlike the curved surface 2b, the flat surface 2a is easy to form the screw hole 22, so that the plate-like seal portion 41 can be screwed and the plate-like seal portion 41 can be reliably prevented from falling. In particular, in the tank 100 for storing LNG, since the bottom surface is formed from a thin steel plate, the influence of the drop of the sealing material is great, and screwing of the plate-like seal portion 41 is effective. Further, since the plate-like seal portion 41 has a counterbore 41a2 in which the screw 42 is disposed at a position deeper than the seal surface 41a, the crushing margin of the seal material can be secured, and the split surfaces of the pair of split mold flanges 1 2 gaps can be reliably sealed.

  Then, as shown in FIG. 7, the second seal member 90 is sandwiched between the pair of split flanges 1 that sandwich the inner tube member 111 and the flange 101 a of the nozzle tube 101. Specifically, bolts 52 are inserted into a plurality of through holes 11 formed in the lid body 10 shown in FIG. 5 and tightened with nuts 53, whereby the second sealing material 90 is paired with the pair of split flanges 1 and nozzles. The tube 101 is sandwiched between the flange 101a. The second sealing member 90 is a sealing rubber formed in an annular shape, and is positioned by the step 3a shown in FIG. 1 and disposed along the mounting surface 3, so that the pair of split flanges 1 and the nozzle tube 101 are disposed. The gap with the flange 101a is hermetically sealed.

  Next, as shown in FIG. 8, the present method removes the inner tube member 111 connected to the upper side of the inner tube member 111 sandwiched between the pair of split flanges 1 among the plurality of inner tube members 111. (4th process). Specifically, the connection between the first-stage inner tube member 111 and the second-stage inner tube member 111 is released, and the first-stage inner tube member 111 is accommodated in the pipe chamber 62. Next, the jig 82 is attached to the second-stage inner pipe member 111, and the opening of the second-stage inner pipe member 111 is airtightly closed. The jig 82 is provided with a lifting eye nut 82a. After the jig 82 is attached to the second-stage inner pipe member 111, the inside of the chamber 60 is purged with an inert gas by a purge means (not shown), and then the pipe chamber 62 is removed from the glove box chamber 61, The pipe member 111 is removed together with the pipe chamber 62.

At this time, the first sealing member 40 is disposed on the split surface 2 of the pair of split mold flanges 1 that sandwich the inner pipe member 111, and the attachment surfaces 3 of the pair of split mold flanges 1 that are attached to the ends of the nozzle pipe 101. Since the second sealing material 90 is disposed on the inner surface of the gas pipe, the flammability from the gap between the inner pipe member 111 and the pair of split mold flanges 1 and the gap between the pair of split mold flanges 1 and the end of the nozzle pipe 101 is determined. Gas ejection can be prevented.
Therefore, according to the present method, the two stages sandwiched between the pair of split flanges 1 among the plurality of inner pipe members 111 in a state where the inside of the nozzle pipe 101 is cut off without attaching a valve to the glove box chamber 61. The first-stage inner tube member 111 connected to the upper side of the inner tube member 111 can be safely removed together with the pipe chamber 62.

  Next, in this method, as shown in FIG. 9, the pipe chamber 62 where the first-stage inner pipe member 111 is lowered is connected to the glove box chamber 61 again in order to remove the second-stage inner pipe member 111. To do. At this time, the lower end of the wire rope 65 is a hook 83 from which the balance 80 is removed and the eye nut 82a of the jig 82 can be lifted. After the pipe chamber 62 is connected to the glove box chamber 61, the inside of the chamber 60 is purged with an inert gas by a purge means (not shown), the pair of split flanges 1 is removed, and the above-described procedure is repeated (return to FIG. 7). Then, the inner tube member 111 at the bottom is removed. Finally, the end of the nozzle tube 101 is closed with a lid (not shown), and the removal of the liquid level sensor 110 is completed.

  As described above, according to the above-described embodiment, the nozzle pipe internal contents are removed by removing the liquid level sensor 110 inside the nozzle pipe 101, and the liquid level sensor 110 is interposed via the flange 111a. A plurality of inner pipe members 111 detachably connected to each other, a first step of installing the chamber 60 so as to surround the end of the nozzle pipe 101, and a plurality of inner pipe members via the end of the nozzle pipe 101 The second step of lifting 111 and accommodating at least one of the plurality of inner tube members 111 inside the chamber 60 and the end of the nozzle tube 101 by sandwiching the plurality of lifted inner tube members 111 with a pair of split flanges 1 And a fourth step of removing the inner tube member 111 connected to the upper side of the inner tube member 111 sandwiched between the pair of split flanges 1 among the plurality of inner tube members 111. In the third step, the first sealing material 40 is disposed on the split surface 2 of the pair of split flanges 1 that sandwich the inner pipe member 111, and the pair of splits attached to the end portion of the nozzle pipe 101. By adopting the means that the second sealing material 90 is arranged on the mounting surface 3 of the mold flange 1, it is possible to safely perform construction by preventing ejection of combustible gas without mounting a valve. Further, the workability is improved by reducing the weight of the glove box chamber 61.

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, in the above-described embodiment, the present invention is applied to the LNG tank, but the present invention may be applied to a tank (for example, an LPG tank) that ejects another combustible gas. In addition, the present invention can be applied to a tank that contains chemicals and the like and ejects a dangerous gas such as a toxic gas.

  Further, for example, in the above-described embodiment, the configuration in which the first sealing material is not attached in advance to the curved surface of the split surface of the split flange has been described. The material may be attached in advance.

DESCRIPTION OF SYMBOLS 1 Split type flange 2 Split surface 2a Plane 2b Curved surface 3 Attachment surface 40 1st sealing material 41 Plate-shaped seal part 41a Seal surface 41a2 Counterbore 42 Screw 43 Cylindrical seal part 43a Cut 43A One end 43B Other end 60 Chamber 90 Second seal Material 101 Nozzle tube 101a Flange 110 Liquid level sensor (container)
111 Inner pipe member 111a Flange

Claims (6)

A method for removing the internal contents of the nozzle tube, which removes the internal contents of the nozzle tube,
The container includes a plurality of inner pipe members that are detachably connected via a flange,
A first step of installing a chamber so as to surround an end of the nozzle tube;
A second step of lifting the plurality of inner tube members through an end of the nozzle tube and accommodating at least one of the plurality of inner tube members in the chamber;
A third step of sandwiching the plurality of suspended inner pipe members between a pair of split flanges and supporting the end parts of the nozzle pipe;
A fourth step of removing the inner pipe member connected above the inner pipe member sandwiched between the pair of split flanges among the plurality of inner pipe members,
In the third step, a first sealing material is disposed on a split surface of the pair of split mold flanges sandwiching the inner pipe member, and an attachment surface of the pair of split mold flanges attached to an end portion of the nozzle pipe A method for removing the internal contents of the nozzle tube, wherein a second sealing material is disposed. The split surface is
A curved surface along the outer peripheral surface of the inner tube member;
A plane that becomes a mating surface of the pair of split flanges,
The first sealing material is
A cylindrical seal portion that is attached to the outer peripheral surface of the inner pipe member separately from the pair of split flanges, and that contacts the curved surface when the inner pipe member is sandwiched between the pair of split flanges,
2. The method for removing a nozzle tube internal container according to claim 1, further comprising: a plate-like seal portion attached in advance to the flat surface of the pair of split flanges.   The removal method of the nozzle pipe internal contents according to claim 2, wherein the plate-like seal portion is screwed to the flat surface.   The said plate-shaped seal | sticker part is a removal method of the nozzle pipe internal accommodation of Claim 3 which has a counterbore which arrange | positions a screw in the position deeper than a sealing surface.   The said cylindrical seal part is a removal method of the nozzle pipe internal accommodation as described in any one of Claims 2-4 which has the cut | interruption formed from one end to the other end. A split flange including a split surface including a plane that becomes a mating surface and a curved surface that is recessed from the plane,
A split flange having a plate-like seal portion attached to the plane.

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