CN111108051A - Lining body repairing method for factory equipment - Google Patents
Lining body repairing method for factory equipment Download PDFInfo
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- CN111108051A CN111108051A CN201880059081.9A CN201880059081A CN111108051A CN 111108051 A CN111108051 A CN 111108051A CN 201880059081 A CN201880059081 A CN 201880059081A CN 111108051 A CN111108051 A CN 111108051A
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- corrosion
- resistant strip
- existing
- strip plate
- lining
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/02—Wall construction
- B65D90/04—Linings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
A method for repairing a lining of a urea plant facility (10) in which a repair hole (2) is formed in the upper end of the urea plant facility (10) by repairing a damage occurring in the inner peripheral surface of an existing lining (4) in the urea plant facility (10) with a new lining. The repairing method comprises a preparation step of preparing a plurality of corrosion-resistant strip plates (6) as new lining bodies. Each corrosion-resistant strip plate (6) has a short side (7) shorter than the inner diameter of the manhole (2) and a long side (8) longer than the inner diameter of the manhole (2). The repairing method further comprises a disposing step of placing the corrosion-resistant strip plate (6) into the urea plant equipment (10) from the manhole (2) in a posture in which the long side (8) is along the vertical direction, and disposing the corrosion-resistant strip plate (6) on the inner peripheral surface of the existing lining body (4) while keeping the long side (8) along the vertical direction. The arrangement in the arranging step is to join the adjacent corrosion-resistant strip plates (6) to each other and join the corrosion-resistant strip plates (6) to the inner peripheral surface of the existing lining body (4).
Description
Technical Field
The invention provides a method for repairing a lining body of a factory device having an existing lining body damaged by corrosion or the like.
Background
In plant equipment which is stationary equipment such as a pressure vessel and a heat exchanger in a plant, for example, urea plant equipment has a thick pressure housing for handling a high-pressure corrosive fluid and an existing corrosion-resistant liner provided on an inner peripheral surface of the pressure housing. Although this existing lining has corrosion resistance, the lining is damaged by thickness reduction due to corrosion by corrosive fluid over the years.
As the thinning damage progresses, the thickness of the existing liner may be caused to fail design criteria. Therefore, when the thickening damage develops to a certain extent, appropriate maintenance of the plant equipment is required.
As for the maintenance, there is, for example, a repair method: after the upper part of the plant equipment is cut, the existing lining body with the thickness reduction damage is taken out from the interior of the plant equipment, and then a new lining body is arranged to replace the existing lining body. However, this repairing method is a large-scale process corresponding to the repair of plant equipment, and requires a large amount of cost and a long construction period, and the plant equipment is lost due to the stoppage of the operation during this period. Therefore, a method is currently proposed to solve this problem: instead of removing an existing liner damaged by thickness reduction, a new liner is disposed on an inner peripheral surface of the existing liner (see, for example, patent document 1).
Documents of the prior art
Patent document
Patent document 1: japanese Kohyo publication Hei 10-505795
Disclosure of Invention
Technical problem to be solved
However, in the method described in patent document 1, a new lining body is hung from a manhole formed at an upper end portion of a plant (urea plant). On the other hand, on page 19 of patent document 1, it is described that the inner diameter of the manhole is 550mm, and on page 20, it is described that the size of the metal plate divided by the new lining body is 400 × 1500mm, and therefore, the metal plate is hung from the manhole in a posture in which the long side (1500mm) is along the vertical direction. However, as shown in fig. 2 of patent document 1, the metal plate is disposed on the existing liner in a posture in which the long side extends in the horizontal direction. Therefore, in order to change the posture (vertically long posture) in which all the metal plates are suspended from the existing liner to the posture (horizontally long posture), all the metal plates must be rotated by 90 ° around the horizontal axis inside the plant equipment. It is time-consuming to rotate all the metal plates in the plant equipment in a narrow space. Therefore, the method described in patent document 1 cannot sufficiently shorten the construction time.
Accordingly, an object of the present invention is to provide a method for repairing a lining of a plant facility, which can sufficiently shorten the construction time.
(II) technical scheme
In order to solve the above-mentioned problems, a first aspect of the present invention is a method for repairing a lining of a plant facility, in which a new lining is used to repair a damage occurring on an inner surface of an existing lining of the plant facility, the plant facility having a manhole formed at an end in a longitudinal direction,
the method includes a preparation step of preparing a plurality of corrosion-resistant strip plates as the new lining bodies, each corrosion-resistant strip plate having a short side shorter than the inner diameter of the manhole and a long side longer than the inner diameter of the manhole,
further comprising an arranging step of placing the corrosion-resistant strip plate from the manhole into the plant equipment in a posture in which the long side is along the longitudinal direction of the plant equipment, and arranging the corrosion-resistant strip plate on the inner surface of the existing lining body while keeping the long side along the longitudinal direction of the plant equipment,
the arranging in the arranging step is to join the corrosion-resistant strip plates adjacent to each other and to join the corrosion-resistant strip plates to the inner surface of the existing liner.
In the method for repairing a lining of a plant facility according to the second aspect of the present invention, the preparation step is a step of dividing the plate as the new lining into a plurality of corrosion-resistant strip plates, and bending each of the corrosion-resistant strip plates in a direction in which both long sides thereof are close to each other, so that the corrosion-resistant strip plate is formed into a shape along an inner surface of an existing lining.
A third aspect of the present invention is the method for repairing a liner of a plant according to the first or second aspect of the present invention, wherein a longitudinal direction of the plant is a vertical direction, the manhole is formed at an upper end portion of the plant,
a jig for positioning the lower end, i.e., the short side, of the corrosion-resistant strip plate is provided in a part of an existing lining body on which the corrosion-resistant strip plate is disposed.
In addition, a method for repairing a lining body for a plant facility according to a fourth aspect of the present invention is the first or second aspect of the present invention, wherein the joining of the corrosion-resistant strip plates adjacent to each other in the arranging step is full penetration welding,
the method further comprises a through-hole forming step of forming a through-hole in a portion corresponding to the existing lining body on which each of the corrosion-resistant strip plates is arranged, the through-hole guiding the liquid leaked from the new lining body to the outside of the plant equipment and detecting the liquid.
(III) advantageous effects
According to the lining repair method for plant equipment, the corrosion-resistant strip plate can be arranged on the inner surface of the existing lining while being kept in the plant equipment, and therefore, the corrosion-resistant strip plate does not need to be rotated about the horizontal axis, and the construction time can be sufficiently shortened.
Drawings
Fig. 1 is a partially cut-away sectional view of a urea plant facility showing a lining repair method for a urea plant facility according to an embodiment of the present invention.
FIG. 2 is a sectional view showing the inside of the plant for urea plants.
FIG. 3 is a plan view of a corrosion-resistant plate as a new lining disposed in the plant for urea plants and a corrosion-resistant strip plate divided from the plate.
Fig. 4A is a front view showing a state where the corrosion-resistant strip plate is bent.
Fig. 4B is a perspective view for explaining a short side of the bent corrosion-resistant strip plate.
FIG. 5 is a side view showing a state where a corrosion-resistant elongated plate is hung from a manhole of the facility for urea plants.
FIG. 6 is a sectional view showing a state where a corrosion-resistant strip is brought close to an existing liner of the plant for urea plants.
Fig. 7 is a cross-sectional view showing a state where the corrosion-resistant elongated plate is positioned by a jig provided inside the urea plant facility.
Fig. 8 is a perspective cross-sectional view showing a state where corrosion-resistant strip plates are joined by welding.
FIG. 9 is a perspective sectional view showing a plant for a urea plant before a new lining body is disposed.
FIG. 10 is an expanded view of the pressure housing and existing liner of FIG. 9 shown expanded in a planar configuration.
Fig. 11 is an expanded view of fig. 10 with an additional lining portion through hole, lining portion communication groove, and new lining.
Detailed Description
Hereinafter, a method for repairing a liner of a plant facility according to an embodiment of the present invention will be described with reference to the drawings.
First, an outline of a plant for a urea plant will be described with reference to fig. 1 as an example of the plant for a urea plant.
As shown in fig. 1, the facility 10 for a urea plant includes: a container body 1 for producing urea inside; and a base 9 that supports the container body 1 such that the longitudinal direction of the container body 1 is the vertical direction. The container body 1 has a cylindrical body portion, and upper and lower portions thereof are hemispherical, so that the upper and lower portions of the body portion are sealed. An access hole 2 is formed in an upper end portion of the container body 1, and the access hole 2 is used for allowing a desired operator, materials, and the like to pass therethrough. In fig. 1, the manhole 2 is concentric with the vessel body 1 in the horizontal direction (the direction perpendicular to the longitudinal direction of the vessel body 1), but is not limited thereto. For example, the manhole 2 may be inclined from the horizontal direction, or may not be concentric with the vessel body 1. The manhole 2 is closed by a cover, not shown, when the urea plant 10 is in operation.
When the plant 10 for urea plants is in operation, inside it there is a corrosive fluid at high pressure, which is required for the urea production process. Therefore, the container body 1 is required to have pressure resistance and corrosion resistance, and therefore the container body 1 includes: a thick pressure housing 3 made of carbon steel or low alloy steel (alloy steel to which several percent of chromium, nickel, molybdenum, etc. are added), and a corrosion-resistant existing liner 4 provided on the inner peripheral surface of the pressure housing 3. Although the existing lining body 4 has corrosion resistance, it is damaged by corrosion of the corrosive fluid on its inner surface (specifically, its inner circumferential surface) over a long period of time. In addition to the thinning damage, various damages due to aging or the like may occur. In order to repair such a damage, a new liner 5 needs to be disposed on the inner peripheral surface of the existing liner 4. The method of arranging the new lining body 5 on the damaged inner peripheral surface of the existing lining body 4, that is, the lining body repairing method of the urea plant equipment 10, is the gist of the present invention.
The method for repairing a lining of a plant 10 for a urea plant, which is the subject of the present invention, is explained in detail below. Since most of the damage occurring on the inner peripheral surface of the existing liner 4 is a thinning damage, the thinning damage will be described below for convenience.
Since the height of the urea plant facility 10 is generally over 10m, a temporary scaffold 11 for workers W to work is installed inside the container main body 1 as shown in fig. 2. For example, the temporary scaffold 11 is assembled by using a tray (not shown) that is an existing member inside. The worker W smoothes the inner peripheral surface of the existing lining body 4, which is formed with the irregularities due to the thickness reduction damage, by grinding or the like using the temporary scaffold 11 and the grinder G.
On the other hand, since the corrosion-resistant plate serving as the new lining 5 is disposed so as to cover the inner peripheral surface of the existing lining 4, the plate itself cannot pass through the manhole 2. Therefore, as shown in fig. 3, as a preparatory step, a corrosion-resistant plate serving as a new lining body 5 is cut into a plurality of pieces (16 pieces in fig. 3 as an example) so as to be suspended into the container main body 1 through the access hole 2. The thus divided plate is hereinafter referred to as a corrosion-resistant strip plate 6. The corrosion-resistant strip plate 6 can be hung from the manhole 2 in a posture in which the long side 8 is along the vertical direction because the short side 7 is shorter than the inner diameter of the manhole 2. Further, if the long side 8 of the corrosion-resistant strip plate 6 is at the same height as the new lining 5 (height to be repaired), the circumferential weld 53 required for the arrangement on the inner circumferential surface of the existing lining 4 can be shortened. However, in consideration of the length limitation of the corrosion-resistant strip plate 6 during transportation, the long side 8 is actually 1/2 or 1/3 of the height of the new lining body 5 (the height to be repaired). The long side 8 needs to be at least longer than the inner diameter of the manhole 2. Each corrosion-resistant strip plate 6 is preferably sized in consideration of internal existing components such as the tray. In addition, each corrosion-resistant strip plate 6 is preferably substantially the same thickness as the thickness of the existing lining body 4 reduced by the thickness reduction damage and the grinding in order to exhibit the effect as a repair and to reduce the weight of the new lining body 5. In order to implement this embodiment, the thickness decreased by the thinning damage may be measured over the entire surface (in a range where repair is necessary), and the average of the measured values may be set as the thickness decreased by the thinning damage. In addition, if there is a deviation locally due to the measured value being large in some parts and small in other parts over the entire face, etc., an average value is calculated for these parts. The average value of the respective portions may be a thickness reduced by the thickness reduction damage. In this case, the thicknesses of the corrosion-resistant strip plates 6 corresponding to the respective portions are made different so as to be substantially the same as the thicknesses of the existing liners 4 reduced by the thickness reduction damage (average value) and the grinding.
As shown in fig. 4A, each corrosion-resistant strip plate 6 is bent into a shape along the inner peripheral surface of the existing lining body 4. Specifically, since 16 corrosion resistant strip plates 6 are joined in parallel to form the new lining 5 having a circumferential shape (360 °), the corrosion resistant strip plates 6 are bent so that the short sides 7 of the corrosion resistant strip plates 6 form an arc having a central angle of 360 °/16 of 22.5 °. In this way, after the corrosion-resistant plate as the new lining 5 is divided into the plurality of corrosion-resistant strip plates 6 by cutting, the corrosion-resistant strip plates 6 are bent into a shape along the inner peripheral surface of the existing lining 4, thereby improving the shape accuracy required for the corrosion-resistant strip plates 6.
The bending of the corrosion-resistant elongated plate 6 shown in fig. 4A is not necessary. Therefore, the corrosion-resistant strip plate 6 is a concept including a bent plate (in the case of bending) and a flat plate (in the case of not bending). In the case where the corrosion-resistant strip plate 6 is a curved plate, the short side 7 is a chord on the outer peripheral surface (curved surface) of the corrosion-resistant strip plate 6 shown in fig. 4B, that is, a straight line corresponding to the short side 7 of the rectangle R in which the corrosion-resistant strip plate 6 is projected in parallel to the plane P. In fig. 4B, the center angle of the corrosion-resistant strip plate 6 is shown not at 22.5 ° as shown in fig. 4A but at a larger angle in order to easily understand that the short side 7 in the case where the corrosion-resistant strip plate 6 is a bent plate.
Thereafter, as shown in fig. 5, as a placement step, the corrosion-resistant strip plates 6 are lifted one by a crane 22 movable along the horizontal guide rail 21, and the corrosion-resistant strip plates 6 are lifted from the manhole 2. The crane 22 is provided with a steel cable 23 and a non-damage clamp 24, wherein the steel cable 23 can be lifted up and down so as to lift up and down the corrosion-resistant strip plate 6; the atraumatic clamp 24 is attached to the lower end of the wire 23. Since the scratch-free jig 24 is held in the vicinity of the short side 7 of the corrosion-resistant strip plate 6, the corrosion-resistant strip plate 6 lifted by the crane 22 is in an attitude in which the long side 8 is along the vertical direction (the longitudinal direction of the urea plant facility 10). The horizontal guide rail 21 is erected at a position crossing directly above the manhole 2 at a height higher than the manhole 2 at a lower end of the corrosion-resistant strip 6 which can be lifted by the crane 22, so that the corrosion-resistant strip 6 can be lifted from the manhole 2.
As shown in fig. 6, when the corrosion-resistant strip plate 6 is gradually suspended inside the container body 1, the operator W manually brings the corrosion-resistant strip plate 6 close to the inner peripheral surface of the existing liner 4, which has been smoothed. Even if the corrosion-resistant strip plate 6 is slightly inclined in the process of approaching the corrosion-resistant strip plate 6 to the existing lining body 4, the long side 8 of the corrosion-resistant strip plate 6 can be made to be in the vertical direction by welding the corrosion-resistant strip plate 6 to the existing lining body 4 in a posture in which the long side 8 is in the vertical direction. Here, it is preferable that the jig 41 for positioning the short side 7, which is the lower end of the corrosion-resistant strip plate 6, be provided in advance at the position thereof. As shown in fig. 7, the jig 41 is a circular arc member divided into a plurality of circular arc members by a circumferential L-shaped steel 42, and the circular arc members are joined to each other by bolts 43 so that the circumferential length can be adjusted. After placing the short side 7, which is the lower end of the corrosion-resistant strip plate 6, on the jig 41, the worker W pushes the corrosion-resistant strip plate 6 to a position where the outer peripheral surface thereof is in contact with the inner peripheral surface of the existing lining body 4. When the corrosion-resistant strip plate 6 reaches a predetermined position, the corrosion-resistant strip plate 6 is temporarily fixed to the inner peripheral surface of the existing liner 4 by temporary welding. In addition, the corrosion-resistant strip plate 6 may be held by a support bar or the like, not shown, in order to stabilize the corrosion-resistant strip plate 6 during the temporary welding.
In this way, when a predetermined number of corrosion-resistant strip plates 6 are temporarily fixed to the inner peripheral surface of the existing liner 4 by temporary welding, the main welding is performed as shown in fig. 8. The main welds are welds 53 along the circumferential direction of the short sides 7 of the corrosion-resistant strip plates 6 and welds 54 along the longitudinal direction of the long sides 8 of the corrosion-resistant strip plates 6. The corrosion-resistant strip plates 6 adjacent in the longitudinal direction are joined to each other by the circumferential welds 53, and the corrosion-resistant strip plates 6 adjacent in the circumferential direction are joined to each other by the longitudinal welds 54. In the main welding, the long sides 8 of the corrosion-resistant strip plates 6 are in the vertical direction, and therefore, the circumferential weld 53 is shorter and the longitudinal weld 54 is longer than in patent document 1 in which the long sides 8 are in the horizontal direction. Generally, the worker W who performs welding has a large risk and burden of welding 53 in the circumferential direction and a small risk and burden of welding 54 in the longitudinal direction. The reason for this is that: when performing the circumferential welding 53, the worker W needs to move in the circumferential direction in order to change the welding position in the circumferential direction, and there is a possibility that the temporary scaffold 11 is stepped on and is damaged, dropped, or the like, which may cause a dangerous accident, and the moving range of the arm performing the welding is large. On the other hand, when performing the vertical welding 54, the worker W does not need to change the standing position by changing the welding position in the vertical direction, and therefore, the risk of stepping on the temporary scaffold 11 is reduced, and the worker W only needs to bend and extend the knee portion while the arm to be welded is substantially fixed. In the main welding, since the circumferential weld 53 and the longitudinal weld 54 are all penetration, the weld metal between the long sides 8 and the short sides 7 reaches the inner peripheral surface of the existing liner 4. Therefore, all the corrosion-resistant strip plates 6 are firmly joined to the inner peripheral surface of the existing liner 4, and the outer peripheral side of one corrosion-resistant strip plate 6 is spatially separated from the outer peripheral side of the adjacent corrosion-resistant strip plate 6 by the weld metal.
In the urea plant facility 10, if the corrosive fluid inside leaks from the existing liner 4 and reaches the pressure housing 3, which is a strength member of the vessel main body 1, is corroded. In order to detect this early, the urea plant 10 is provided with detection means for detecting corrosive fluid leaking from the existing liner 4 by being guided to the outside of the pressure housing 3. Since the detection mechanism is not shown in fig. 1 to 8, the detection mechanism (in particular, a flow path for guiding a leaking corrosive fluid to the outside of the pressure housing 3) will be described with reference to fig. 9 to 11.
Fig. 9 is a perspective view of the container body 1 divided in the longitudinal direction. The vessel body 1 shown in fig. 9 is in a state before a new liner 5 is disposed, that is, in a state of being constituted by the pressure housing 3 and the existing liner 4. The dotted line drawn on the inner peripheral surface of the existing lining body 4 shown in fig. 9 is a line corresponding to the welding 54 in the predetermined longitudinal direction of the arranged corrosion-resistant strip plate 6. As shown in fig. 9, the pressure housing 3 and the existing liner 4 are substantially circumferential, but for simplicity of explanation, the following description will be made with reference to fig. 10 in which the pressure housing 3 and the existing liner 4 are developed into a planar shape.
As shown in fig. 10, through holes 37 (hereinafter, referred to as pressure-resistant part through holes 37) are formed in the pressure housing 3 at predetermined intervals in the circumferential direction and the longitudinal direction, and the pressure-resistant part through holes 37 guide the corrosive fluid leaking from the existing liner 4 to the outside. Further, a communication groove 38 (hereinafter, referred to as a pressure-resistant portion communication groove 38) is formed in the inner peripheral surface of the pressure-resistant housing 3, and the pressure-resistant portion communication groove 38 communicates pressure-resistant portion through holes 37 adjacent in the circumferential direction and the longitudinal direction. Therefore, the corrosive fluid leaking from the existing liner 4 passes through the pressure-resistant section communication groove 38 or directly leads to the pressure-resistant section through hole 37, and is led from the pressure-resistant section through hole 37 to the outside of the pressure housing 3. The corrosive fluid introduced to the outside of the pressure housing 3 is detected by a detector not shown. The detection means is not limited to a means for guiding the corrosive fluid leaking from the existing liner 4 to the outside of the pressure housing 3 and detecting the corrosive fluid, and may be a means for detecting the corrosive fluid inside the pressure housing 3. In this case, the detector, not shown, is provided inside the pressure housing 3, and the detection result can be obtained outside the pressure housing 3.
Here, as shown in fig. 11, in the present invention, the new lining 5 is disposed on the inner peripheral surface of the existing lining 4, and as described above, the outer peripheral side of the adjacent corrosion-resistant strip plate 6 (the gap with the existing lining 4) is spatially blocked by the weld metal, so that there is a possibility that the corrosive fluid leaking from the corrosion-resistant strip plate 6 remains on the outer peripheral side of the corrosion-resistant strip plate 6. In order to prevent this, after the inner peripheral surface of the existing liner 4 is smoothed by grinding or the like by the grinder G, as a through-hole forming step, a through-hole 47 (hereinafter referred to as a liner portion through-hole 47) as shown in fig. 11 is formed in a corresponding portion of the existing liner 4 where each corrosion-resistant strip plate 6 is arranged. Preferably, the lining portion through-holes 47 are provided in plural numbers (two upper and lower in fig. 11 as an example) at corresponding portions of the existing lining 4 where the corrosion-resistant strip plates 6 are arranged. In this case, a communication groove 48 (hereinafter referred to as a liner portion communication groove 48) that communicates the plurality of liner portion through holes 47 is also formed. The liner portion through hole 47 is preferably formed at a position corresponding to the pressure-resistant portion communication groove 38, but may be formed at a position corresponding to the periphery of the pressure-resistant portion communication groove 38. Thereby causing: the corrosive fluid leaking from the corrosion-resistant strip plate 6 does not remain on the outer peripheral side of the corrosion-resistant strip plate 6, but is guided from the pressure-resistant portion through hole 37 to the outside of the pressure housing 3 through the pressure-resistant portion communication groove 38 after passing through the liner portion communication groove 48 or directly guiding to the liner portion through hole 47.
Thus, according to the lining repairing method of the urea plant facility 10, since the corrosion-resistant strip plate 6 can be disposed on the inner peripheral surface of the existing lining 4 while being held in the container main body 1, it is not necessary to rotate the corrosion-resistant strip plate 6 about the horizontal axis, and the working time can be sufficiently shortened.
Further, by dividing the corrosion-resistant plate as the new lining 5 into a plurality of corrosion-resistant strip plates 6 by cutting and then bending the corrosion-resistant strip plates 6 into a shape along the inner peripheral surface of the existing lining 4, the accuracy of the shape required for the corrosion-resistant strip plates 6 is improved, and the corrosion-resistant strip plates 6 are easily arranged on the inner peripheral surface of the existing lining 4, so that the construction time can be further sufficiently shortened.
Further, since the lower end of the corrosion-resistant strip plate 6, that is, the short side 7 can be positioned by the jig 41, the corrosion-resistant strip plate 6 can be easily arranged on the inner peripheral surface of the existing lining body 4, and the working time can be further sufficiently shortened.
Further, since the circumferential weld 53 is shortened, the risk and burden of welding for the worker W who performs welding are reduced, and thus the construction time can be further sufficiently shortened.
Further, since the corrosion-resistant strip plates 6 are joined to each other by full penetration welding, all the corrosion-resistant strip plates 6 are firmly joined to the inner peripheral surface of the existing liner 4, but the corrosive fluid can be detected without remaining on the outer peripheral side of the corrosion-resistant strip plates 6 by the liner portion through holes 47, thereby improving the reliability of the urea plant facility 10.
In the above embodiment, the case where the longitudinal direction of the plant 10 for a urea plant is the vertical direction has been described, but the present invention is not limited thereto, and may be an inclined or horizontal direction. When the longitudinal direction of the urea plant facility 10 is the horizontal direction, the corrosion-resistant strip plate 6 can be placed from the manhole 2 in a posture in which the long side 8 thereof is along the horizontal direction, and can be arranged on the inner peripheral surface of the existing liner 4 while maintaining the posture.
In the above embodiment, the corrosion-resistant elongated strip 6 is hung by the crane 22 to be put into the urea plant facility 10 from the manhole 2, but the invention is not limited thereto and any other suitable method may be used.
In the above embodiment, the case where the adjacent corrosion-resistant strip plates 6 are joined to each other and the corrosion-resistant strip plates 6 are joined to the inner circumferential surface of the existing liner 4 by the main welding has been described, but the present invention is not limited to this and may be any joining.
In the above embodiment, the urea plant facility 10 has been described as an example of a plant facility, but the present invention is not limited to this, and any plant facility may be used as long as it includes the existing lining body 4 that needs to be repaired. Specific examples of the plant facilities include ammonia plant facilities and petroleum refining plant facilities.
In the above embodiment, the pressure housing 3 is illustrated as a single layer for simplicity of explanation, but may be a plurality of layers.
In addition, the above embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined not by the above description but by the appended claims, and all changes that come within the meaning and range of equivalency of the claims are intended to be embraced therein. The configuration described in the above embodiment is arbitrary except for the first invention of "means" and can be deleted or changed as appropriate.
Claims (4)
1. A method of repairing a lining of a plant facility, in which a new lining is used to repair a damage occurring on an inner surface of an existing lining of the plant facility, the plant facility having an access hole formed at an end in a longitudinal direction,
the method includes a preparation step of preparing a plurality of corrosion-resistant strip plates as the new lining bodies, each corrosion-resistant strip plate having a short side shorter than the inner diameter of the manhole and a long side longer than the inner diameter of the manhole,
further comprising an arranging step of placing the corrosion-resistant strip plate from the manhole into the plant equipment in a posture in which the long side is along the longitudinal direction of the plant equipment, and arranging the corrosion-resistant strip plate on the inner surface of the existing lining body while keeping the long side along the longitudinal direction of the plant equipment,
the arranging in the arranging step is to join the corrosion-resistant strip plates adjacent to each other and to join the corrosion-resistant strip plates to the inner surface of the existing liner.
2. The liner repair method of claim 1,
the preparation in the preparation step is to divide the plate as the new lining body into a plurality of corrosion-resistant strip plates, and bend each corrosion-resistant strip plate in a direction in which both long sides thereof are close to each other, thereby forming the corrosion-resistant strip plate into a shape along the inner surface of the existing lining body.
3. The method for repairing a liner of a plant according to claim 1 or 2,
the length direction of the factory equipment is vertical, the upper end part of the factory equipment is provided with the access hole,
a jig for positioning the lower end, i.e., the short side, of the corrosion-resistant strip plate is provided in a part of an existing lining body on which the corrosion-resistant strip plate is disposed.
4. The method for repairing a liner of a plant according to claim 1 or 2,
the joining of the adjacent corrosion resistant strip plates in the arranging step is full penetration welding,
the method further comprises a through-hole forming step of forming a through-hole in a portion corresponding to the existing lining body on which each of the corrosion-resistant strip plates is arranged, the through-hole guiding the liquid leaked from the new lining body to the outside of the plant equipment and detecting the liquid.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-227307 | 2017-11-28 | ||
| JP2017227307A JP6537582B2 (en) | 2017-11-28 | 2017-11-28 | Repairing method of lining for plant equipment |
| PCT/JP2018/021400 WO2019106866A1 (en) | 2017-11-28 | 2018-06-04 | Method for repairing lining of plant equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111108051A true CN111108051A (en) | 2020-05-05 |
| CN111108051B CN111108051B (en) | 2021-11-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880059081.9A Active CN111108051B (en) | 2017-11-28 | 2018-06-04 | Lining body repairing method for factory equipment |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6537582B2 (en) |
| CN (1) | CN111108051B (en) |
| WO (1) | WO2019106866A1 (en) |
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| JP2005306392A (en) * | 2004-04-16 | 2005-11-04 | Kfc Ltd | Lining structure of storage pit and method for constructing the same |
| JP2006062324A (en) * | 2004-08-30 | 2006-03-09 | Fuji Heavy Ind Ltd | Resin layer forming method on curved surface |
| CN107116783A (en) * | 2017-05-15 | 2017-09-01 | 丁冲 | A kind of cylinder of steel internal lining antisepsis method |
-
2017
- 2017-11-28 JP JP2017227307A patent/JP6537582B2/en active Active
-
2018
- 2018-06-04 WO PCT/JP2018/021400 patent/WO2019106866A1/en active Application Filing
- 2018-06-04 CN CN201880059081.9A patent/CN111108051B/en active Active
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| JPS5473875A (en) * | 1977-11-25 | 1979-06-13 | Sorijiyuuru Japan Kk | Lining surface |
| JPS5730958Y2 (en) * | 1978-12-20 | 1982-07-07 | ||
| JPH0469499A (en) * | 1990-07-09 | 1992-03-04 | Ishikawajima Harima Heavy Ind Co Ltd | Method for installing side membrane for underground tank and package box |
| JPH10505795A (en) * | 1994-09-22 | 1998-06-09 | スナムプロジェッティ ソシエタ ペル アチオニ | Method for restoring the function of a severely eroded device in a urea production plant |
| JP2005306392A (en) * | 2004-04-16 | 2005-11-04 | Kfc Ltd | Lining structure of storage pit and method for constructing the same |
| JP2006062324A (en) * | 2004-08-30 | 2006-03-09 | Fuji Heavy Ind Ltd | Resin layer forming method on curved surface |
| CN107116783A (en) * | 2017-05-15 | 2017-09-01 | 丁冲 | A kind of cylinder of steel internal lining antisepsis method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6537582B2 (en) | 2019-07-03 |
| WO2019106866A1 (en) | 2019-06-06 |
| CN111108051B (en) | 2021-11-09 |
| JP2019093532A (en) | 2019-06-20 |
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