JP5912980B2 - Pressure vessel pressure test method, pressure test device and pressure test device construction method - Google Patents

Description

  The present invention relates to an on-site pressure vessel pressure test method, a pressure test device, and a pressure test device construction method.

In pressure vessels such as atmospheric tanks of oil refining equipment and main distillation towers of vacuum distillation equipment, etc., if a part of the shell plate is thinned due to corrosion after many years of use, it must be renewed or repaired. is there.
The thing of patent document 1 is known as an example of the partial renewal construction method of the trunk plate of such tower tanks.
This construction method is a method of renewing a large cylindrical body part of a part of a body plate of a tower tank. The large cylindrical body part to be renewed is divided into a plurality of cylindrical body parts in the vertical direction. The cylindrical body parts are sequentially updated by repeatedly cutting and removing the cylindrical body parts in the circumferential direction and repeatedly attaching the new body parts to the openings formed by welding. The large cylindrical body plate portion is renewed.

Thus, a pressure test may be performed on a pressure vessel such as a tower tank or the like obtained by updating the large cylindrical body plate portion.
As the pressure test, a pressure test by water pressure and a pressure test by gas pressure are considered.
The pressure test with water pressure is performed at a pressure 1.5 times the maximum operating pressure (design pressure) in accordance with laws and regulations, and it is necessary to confirm that there is no leakage and pressure resistance performance.
On the other hand, the pressure resistance test by gas pressure is performed at a pressure 1.25 times the maximum operating pressure (design pressure), and it is necessary to confirm that there is no leakage and the pressure resistance performance.

Japanese Patent No. 4837135

However, the pressure resistance test using water pressure has the following problems because the entire container is filled with water.
(1) Since the weight of the test water is added to the weight of the container itself, the strength of the container itself, the foundation, and the anchor bolt may be insufficient in the earthquake resistance during the test, and the test may not be performed.
(2) In a container holding a tray such as a distillation tower, it takes a very long time because the flow rate must be limited so that the tray does not break due to differential pressure during water injection or drainage after the test. It is not realistic in the short-term construction period such as regular repair work.
(3) Since the amount of water in a large container is enormous, it takes too much time to secure and pour water, which is not realistic.

  Moreover, in the pressure test by gas pressure, since the entire container is filled with gas, the existing pressure-resistant parts other than the modified part must be checked for soundness before time to ensure safety. For verification, the plate thickness of the pressure-resistant part and the nondestructive inspection of the welded part are performed.However, since most of the general pressure vessels are kept warm during the implementation, removal and restoration of this, installation of scaffolds inside and outside the container, Removal, surface treatment of welds for non-destructive inspection, etc. must be performed as time-honored work. After these, since soundness confirmation is performed, a series of work amount becomes enormous, and the cost and the construction period become unrealistic.

  The present invention has been made in view of the above circumstances, and it is possible to easily and reliably modify or update a part of the pressure vessel in a renewed portion of the pressure vessel without taking the effort required for the conventional pressure resistance test. An object of the present invention is to provide a pressure test method capable of performing a pressure test, a pressure test device, and a construction method of the pressure test device.

In order to achieve the above object, the pressure vessel pressure test method of the present invention is a pressure vessel pressure test method in an updated portion obtained by remodeling or updating a part of a cylindrical pressure vessel whose both ends are closed. And
The inside of the pressure vessel is divided into a plurality of chambers by partitioning in the axial direction by at least one partition wall intersecting the axial direction of the pressure vessel,
At least one chamber of the plurality of chambers includes the update portion;
A pressure test pressure with gas is applied to the chamber including the renewal part, and a predetermined pressure with a gas lower than the pressure test pressure and higher than the outside of the pressure vessel is applied to a chamber not including the renewal part adjacent to the chamber. It is characterized by applying.

Here, “the chamber includes an updated portion” means that the chamber faces a barrel portion formed by renewing a part of the body of the pressure vessel, and the cylinder is not required to be renewed. When a part such as a nozzle provided in the part is updated, this means that a part of the nozzle faces the chamber.
In addition, the predetermined pressure applied to the chamber not including the renewal portion is preferably the design pressure of the pressure vessel and may be somewhat lower than this design pressure, but a pressure exceeding the design pressure is not preferable.

In the present invention, the inside of the pressure vessel is divided into a plurality of chambers by partition walls, and a pressure test pressure is applied to the chamber including the renewed portion by gas, so that the pressure resistance test is performed on the entire body of the chamber including the renewed portion. Pressure is applied. Therefore, it is possible to perform the pressure resistance test of the pressure vessel in the renewal portion easily and surely without taking time and effort required for the conventional pressure resistance test.
In addition, since a predetermined pressure is applied to the chamber not including the renewal portion adjacent to the chamber including the renewal portion by a gas having a pressure lower than the pressure test pressure and higher than the outside of the pressure vessel, the partition wall has a predetermined pressure from the pressure test pressure. The pressure (differential pressure) obtained by reducing the pressure acts. Therefore, the soundness of the partition wall can be maintained without applying an excessive pressure test pressure to the partition wall. As a result, a reliable pressure container pressure test can be performed.

In addition, since the pressure resistance test can be performed in a limited manner, it is possible to make modifications and partial updates that could not be handled by the pressure resistance test of the entire container.
Further, since a pressure (differential pressure) obtained by subtracting a predetermined pressure from the pressure resistance test pressure acts on the partition wall, the partition wall can be designed by a differential pressure design. For this reason, the partition wall can be made thinner and lighter, and can be used in a pressure test of a large pressure vessel. In particular, since the thickness of the partition can be designed at a maximum of 1/5 of the test pressure, the partition can be significantly reduced in weight.
Furthermore, since the pressure resistance test with gas can be performed within a limited range, problems such as temporary removal and damage of internal parts such as trays installed in the existing body are eliminated.
In addition, by making the gas pressure applied to the existing body part (body part not including the renewal part) within the design pressure during the pressure resistance test, a nondestructive inspection for confirming the soundness of the existing body part becomes unnecessary.

  In the configuration of the present invention, the partition wall is formed in a spherical shape, and an outer peripheral portion thereof is joined to an inner peripheral surface of a body portion of the pressure vessel, and the partition wall is provided on the chamber side to which the pressure resistance test pressure is applied. It is preferable that the concave curved surface faces.

  According to such a configuration, the pressure resistance test pressure applied to the chamber including the renewal portion acts evenly on the concave curved surface of the missing spherical partition wall, and the predetermined pressure acts equally on the convex curved surface on the back side of the partition wall. Can be made evenly and as thin as possible.

The pressure vessel pressure test apparatus of the present invention is a pressure test device used in the pressure vessel pressure test method,
By partitioning the inside of the pressure vessel in the axial direction of the pressure vessel, a plurality of chambers are formed inside the pressure vessel so that at least one of the chambers includes the renewal portion. When,
A pressure test pressure by gas is applied to the chamber including the renewal portion, and a predetermined pressure is applied to the chamber not including the renewal portion adjacent to the chamber by a gas having a pressure lower than the pressure test pressure and higher than the outside of the pressure vessel. Pressure applying means for applying pressure.

In the present invention, since a pressure-resistant test pressure is applied to the chamber including the renewed portion by the gas by the pressure applying means, the pressure-resistant test pressure is applied to the entire body of the chamber including the renewed portion. Therefore, it is possible to perform the pressure resistance test of the pressure vessel in the renewal portion easily and surely without taking time and effort required for the conventional pressure resistance test.
In addition, since a predetermined pressure is applied to the chamber not including the renewal portion adjacent to the chamber including the renewal portion by the pressure application means by a gas having a pressure lower than the pressure resistance test pressure and higher than the outside of the pressure vessel, A pressure (differential pressure) obtained by subtracting a predetermined pressure from the pressure resistance test pressure acts. Therefore, the soundness of the partition wall can be maintained without applying an excessive pressure test pressure to the partition wall. As a result, a reliable pressure container pressure test can be performed.

  In the configuration of the present invention, the partition wall is formed in a spherical shape, and an outer peripheral portion thereof is joined to an inner peripheral surface of a body portion of the pressure vessel, and the partition wall is provided on the chamber side to which the pressure test air pressure is applied. It is preferable that the concave curved surface faces.

  Here, the “partially formed partition wall” is a curved plate-like partition wall made up of a curved surface forming a part of a spherical surface by cutting a hollow sphere with a plane perpendicular to its axis. Means that.

  According to such a configuration, the pressure resistance test pressure applied to the chamber including the renewal portion acts equally on the concave curved surface of the missing spherical partition, and the predetermined pressure acts equally on the convex curved surface on the back side of the partition. The thickness of the partition wall can be reduced as much as possible because the strength can be calculated with these offset pressures.

In the configuration of the present invention, the missing spherical partition wall is a ring-shaped missing ball ring joined to the inner peripheral surface of the body portion of the pressure vessel, and the missing ball fixed to the missing ball ring. With a missing ball end plate that closes the inside of the ring,
The missing ring is preferably configured by joining together ring pieces divided into a plurality in the circumferential direction.

Here, the “missing ball ring” means a ring formed by cutting a missing ball having a hollow inside along a plane perpendicular to the axis of the missing ball.
Further, the “missing spherical end plate” means a curved plate formed of a curved surface constituting a part of a spherical surface by cutting a hollow sphere with a plane perpendicular to the axis thereof.

According to such a configuration, the missing ball ring joined to the inner peripheral surface of the body portion of the pressure vessel is constituted by joining the ring pieces divided into a plurality in the circumferential direction thereof. Are joined to the inner peripheral surface of the body of the pressure vessel so as to constitute the missing ball ring, and adjacent ring pieces are joined to each other so that the missing ring can be easily formed on the inner peripheral surface of the body of the pressure vessel. Can be attached to. Then, a missing spherical partition wall can be easily formed by fixing a missing ball end plate to the missing ball ring so as to block the inside of the missing ball ring.
In addition, even if the existing body part (body part not including the renewal part) is deformed and the roundness is distorted, the length of the ring piece is joined to the inner circumference of the body part. Therefore, the roundness deviation is dispersed by the number of divisions of the ring pieces. Therefore, it is easy to match the skin to the inner peripheral surface of the existing barrel portion, and a missing ball ring can be easily formed.
Further, by dividing the missing ball ring, the weight is reduced and the size is reduced, so that the workability at the site is improved, and the time can be shortened and the safety can be improved.

Moreover, the construction method of the pressure test apparatus of the pressure vessel of the present invention,
Carrying the missing ball ring divided into the ring pieces and the missing ball end plate to the site where the pressure vessel is installed;
Next, the ring pieces are welded to the inner peripheral surface of the body portion of the pressure vessel so as to constitute the missing ball ring, and adjacent ring pieces are welded and joined together,
Next, the partition wall is provided by welding the missing ball end plate so as to close the inside of the missing ball ring welded to the inner peripheral surface of the body part,
Next, the pressure applying means is attached to the pressure vessel.

  In the present invention, the ring pieces carried into the site are welded to the inner peripheral surface of the body portion of the pressure vessel so as to form a missing ball ring, and adjacent ring pieces are welded and joined to each other. Thus, the missing ball ring can be easily welded to the inner peripheral surface of the body of the pressure vessel. Then, a missing spherical partition can be easily formed in the field by welding a missing ball end plate so as to close the inside of the missing ball ring welded to the inner peripheral surface of the body portion.

  ADVANTAGE OF THE INVENTION According to this invention, the pressure | voltage resistant test of the pressure vessel in the update part formed by remodeling or updating a part of pressure vessel can be performed easily and reliably without the effort which a conventional pressure | voltage resistant test requires.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional front view illustrating a pressure vessel for performing a pressure test, for explaining a pressure test method according to an embodiment of the present invention. 4A is an exploded perspective view of a lower partition, FIG. 3B is a perspective view of a lower partition, FIG. 3C is an exploded perspective view of an upper partition, and FIG. 3D is a perspective view of an upper partition. It is sectional drawing which shows the principal part of the pressure vessel which performs a pressure-resistant test. It is sectional drawing which shows the state which cut | disconnected the trunk | drum part of the part which should be updated similarly. (A) is sectional drawing which shows the state which provided the missing ball ring in the upper end part of the existing trunk | drum, (b) is a top view which shows the state which provided the missing ball ring in the upper end part of the existing trunk | drum, (C) is a top view which shows the state which provided the missing ball ring in the upper end part of the said existing trunk | drum in case the diameter of the existing trunk | drum is large. It is a perspective view which shows the case where an adjustment allowance is provided in the ring piece. FIG. 5A is a cross-sectional view showing a state in which a partition wall is provided at the upper end of an existing body, and FIG. 5B is a plan view showing a state in which a partition is provided at the upper end of the existing body. It is sectional drawing which shows the state which joined the new trunk | drum part (update part) to the upper end part of the existing trunk | drum similarly. It is sectional drawing which shows the state which installed the scaffold inside the new trunk | drum part (update part) same as the above. It is sectional drawing which shows the state which suspended the existing trunk | drum part above the new trunk | drum part (update part) similarly. It is sectional drawing which shows the state which joined the existing trunk | drum part to the new trunk | drum part (update part) equally. It is sectional drawing which shows the state which joined the missing ball ring to the existing trunk | drum part equally. It is sectional drawing which shows the state which joined the partition to the existing trunk | drum part equally. It is sectional drawing which shows the state which attached the pressure provision means to the trunk | drum similarly. It is sectional drawing of the principal part which shows the state which cut | disconnected the partition after the pressure | voltage resistant test. It is sectional drawing which showed the some example of the other pressure vessel which implements the pressure | voltage resistant test method based on this invention to (a)-(e), respectively.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In this embodiment, the present invention is applied to a case where the body of a pressure vessel which is a main distillation tower of an atmospheric distillation apparatus of a petroleum refining apparatus or a vacuum distillation apparatus is partially updated.

In FIG. 1, reference numeral 1 denotes a pressure vessel. The pressure vessel 1 has a cylindrical body portion 2 whose top portion is formed in a spherical shape, and its lower end portion is installed on a foundation provided on the ground. In addition, the diameter of the trunk | drum 2 is about 4-10m.
The body portion 2 is formed in a cylindrical shape by joining a plurality of circular plate-shaped body plates 3 in the circumferential direction and the axial direction of the body portion 2 by welding.

And in this Embodiment, the trunk | drum 5 which is a part of intermediate part of the up-down direction among the trunk | drums 2 is changed into a new thing (update part), and the pressure resistance test of the pressure vessel 1 after the change is performed.
Hereinafter, a pressure test method for the pressure vessel 1 will be described with reference to FIGS.
First, as shown in FIGS. 2 (a) and 2 (c), components constituting partition walls for partitioning the inside of the pressure vessel 1 are manufactured at a factory.
The structure shown in FIG. 2A constitutes a partition wall 10 for the lower part, and the partition wall 10 is constituted by an annular missing ball ring 11 and a missing ball end plate 12 closing the inside of the missing ball ring 11. It is configured.

The missing ball ring 11 is constituted by joining a plurality of ring pieces 11a divided in the circumferential direction by welding, and a predetermined number of the ring pieces 11a are manufactured in a factory.
The missing spherical end plate 12 is constituted by an end plate main body 12a formed in an oval shape and a manhole portion 12c having a lid 12b formed on the top of the end plate main body 12a.
Then, as shown in FIG. 2 (b), the partition wall 10 is formed by welding and fixing the missing spherical end plate 12 to the missing ball ring 11 so as to close the inside thereof. Such a partition wall 10 is formed in a spherical shape that protrudes downward.

FIG. 2C shows an upper partition 20, which is similar to the partition 10, and has an annular missing ring 21 and an inner side of the missing ring 21. It is constituted by a closed spherical plate 22 to be closed.
Similarly to the missing ball ring 11, the missing ball ring 21 is configured by joining ring pieces 21 a to each other by welding.
The missing spherical end plate 22 is constituted by an end plate main body 22a formed in an oval shape and a manhole portion 22c having a lid 22b formed on the top of the end plate main body 22a.
Then, as shown in FIG. 2 (d), the partition wall 20 is formed by welding and fixing the missing lens end plate 22 to the missing ball ring 21 so as to close the inside thereof. Such a partition wall 20 is formed in a spherical shape that is convex upward.
Since the partition wall 10 and the partition wall 20 are merely reversed in the vertical direction, in practice, one partition wall 10 (20) may be manufactured in a factory or the like.

Further, when a member constituting the partition wall 10 (20) is manufactured, a lacking spherical member formed by a thin plate (a member obtained by cutting a part of a hollow sphere with a plane perpendicular to the axis of the sphere) is lacking. The spherical ring 11 (21) and the end plate body 12a (22a) are manufactured by cutting and dividing the spherical ring 11 (21) and the end plate body 12a (22a). What is necessary is just to produce several ring piece 11a (21a) by dividing | segmenting into several in the circumferential direction.
Further, a holeless end plate 12 (22) is manufactured by forming a hole at the top of the end plate body 12a (22a) and attaching a manhole portion 12c (22c) to the hole.

  FIG. 3 shows an intermediate part of the body part 2 of the pressure vessel 1, and the body part 5 which is a part of the intermediate part is cut and removed. In this case, the cutting position to be cut is marked on the outer peripheral portion of the barrel portion 2 to determine the cutting lines S and S, and the mounting portion (not shown) attached to the barrel portion 5 and its periphery is removed. Then, as shown in FIG. 4, the trunk | drum 2 is cut | disconnected by the cutting lines S and S, and is removed. In addition, while removing the trunk | drum part 5 using a crane etc., the existing trunk | drum part 6 which existed above the said trunk | drum part 5 moves with a crane etc., and is temporarily set | placed on the appropriate place.

Next, as shown in FIG. 5A, the missing ball ring 11 constituting the partition wall 10 is predetermined from the upper end of the body part 2 on the inner peripheral surface of the upper end part of the existing body part 2 after the body part 5 is cut and removed. Join the lower position by the length.
The plurality of ring pieces 11a and the missing ball end plate 12 constituting the missing ball ring 11 are carried in advance from the factory to the site.
When the missing ball ring 11 is joined to the inner peripheral surface of the trunk portion 2, the ring piece 11 a is welded to the inner circumferential surface of the upper end portion of the trunk portion 2 so as to form the missing ball ring 11, and adjacent ring pieces 11 a. , 11a are welded together.

  That is, first, as shown in FIG. 5A (a), after determining the attachment position on the inner peripheral surface of the upper end portion of the trunk portion 2 by marking, the ring piece 11a is aligned with the attachment position of the inner peripheral surface of the trunk portion 2. Arrange them. In this case, the positioning jig 25 is attached to the outer peripheral portion of the ring piece 11 a in advance, and the positioning jig 25 is set along the inner peripheral surface of the trunk portion 2, whereby the inner circumference of the trunk portion 2 is set. The positioning jig 25 is removed from the ring piece 11a after the outer peripheral part of the ring piece 11a is arranged and temporarily fixed on the surface, and then the outer peripheral part of the ring piece 11a and the inner peripheral surface of the body part 2 Weld. By doing in this way, the ring piece 11a can be easily welded to the inner peripheral surface of the trunk portion 2 so that the angle formed by the ring piece 11a and the inner peripheral surface of the barrel portion 2 becomes a predetermined angle.

  And, as shown in FIG. 5A (b), after arranging the outer peripheral portion of the ring piece 11a along the inner peripheral surface of the trunk portion 2 in the order indicated by the circled numbers, The outer peripheral part of the said ring piece 11a and the inner peripheral surface of the trunk | drum 2 are welded sequentially. Then, the adjacent ring pieces 11a and 11a are welded together. That is, the next ring piece 11a is welded and joined to the ring piece 11a previously welded to the inner peripheral surface of the body portion 2.

In this case, in a factory or the like, the backing metal 26 is attached to the back surface of one of the adjacent ring pieces 11a and 11a by welding so as to protrude from the end of the ring piece 11a, and The abutting portion 27 is welded after the end of the ring piece 11a is abutted against the end of one ring piece 11a. In this way, the ring pieces 11a are successively welded to the inner peripheral surface of the upper end portion of the trunk portion 2 along the circumferential direction. Thereafter, the ring-shaped ring 11 is formed on the inner peripheral surface of the upper end portion of the trunk portion 2 by welding adjacent ring pieces 11a and 11a.
In addition, when there is an error in the inner peripheral length of the body portion 2, since the backing metal 26 is attached to the joint portion between the ring pieces 11a and 11a, the distance between the abutting portions between the ring pieces 11a and 11a Can be adjusted evenly little by little to adjust the error of the inner peripheral length of the body 2.

In addition, when joining the missing ball ring 11 to the inner peripheral surface of the upper end portion of the trunk portion 2 as described above, a reinforcing ring is provided on the outer peripheral surface of the trunk portion 2 as shown in FIG. 5A. 28 may be joined to the missing ring 11 by welding.
Also, when the diameter of the body portion 2 is large and the missing ball ring 11 is large as shown in FIG. 5A (c), the number of ring pieces 11a is increased and the ring pieces 11a are welded in the circumferential direction. An error occurs. In this case, by changing the interval between the ring pieces 11a and 11a little by little by the backing metal 26 attached to the joint between the ring pieces 11a and 11a, an error in the inner peripheral length of the body 2 can be reduced. The case where adjustment cannot be performed is assumed.
In order to absorb this error, an adjustment allowance 29 may be provided at an appropriate joint portion of the joint portions between the ring pieces 11a and 11a of the missing ball ring 11. In this case, the ring pieces 11a are arranged in the circumferential direction in the order indicated by the circled numbers and welded, while the ring pieces 11a are arranged in the same direction as the circumferential direction in the order indicated by the numbers enclosed by the squares. Then, we are welding diagonally at the same time. An adjustment allowance 29 (see FIG. 5B) formed on one ring piece 11a is provided between the first ring piece 11a surrounded by a circle and the fourth ring piece 11a enclosed by a square, An adjustment allowance 29 formed on one of the ring pieces 11a is also provided between the first ring piece 11a surrounded by a circle and the fourth ring piece 11a surrounded by a circle.
Accordingly, as shown in FIG. 5B, adjustment of the inner peripheral length of the body 2 is performed by cutting the adjustment allowance 29 at an appropriate position, so that the missing ball ring 11 can be easily and reliably removed even if the error is large. 2 can be joined to the inner peripheral surface.

  When the adjustment allowance 29 is provided, as shown in FIG. 5B, the predetermined ring piece 11a is formed in advance to be longer than the other ring pieces 11a and includes the adjustment allowance 29 so as to be adjacent to the predetermined allowance. After confirming that the gap between the ring pieces 11 a and 11 a is appropriate, the ring pieces 11 a including the adjustment piece 29 are welded to each other.

Next, as shown in FIG. 6, the missing ball end plate 12 is welded and fixed so as to close the inside of the missing ball ring 11.
In this case, the missing ball end plate 12 is suspended from above the missing ball end plate 11 with a crane or the like with its convex curved surface facing downward, and the manhole portion 12 c at the top of the missing ball end plate 12 is located below the missing ball end ring 11. The outer peripheral part of the end plate body 12a is placed on the inner peripheral part of the missing ring 11 and then welded.
In this case, the outer peripheral edge of the end plate body 12 a and the portion slightly inside the inner peripheral edge of the missing ring 11 are welded. Further, if necessary, the inner peripheral edge of the missing ball ring 11 and a portion slightly inside the outer peripheral edge of the end plate body 12a are welded, and further, the central portion of the portion where the end plate body 12a and the missing ball ring 11 overlap each other. Plug welding may be performed.
In addition, since this joining method joins the joining part of the missing ball ring 11 and the missing ball end plate 12 by double-sided fillet welding, it is not necessary to match the joint surface like butt welding, and the missing ball ring Even if an error occurs between the inner diameter of 11 and the outer diameter of the missing spherical end plate 12, adjustment is possible within the range of overlap of the connecting portions.

  The partition wall 10 configured as described above is formed in a spherical shape, and its outer peripheral portion is joined to the inner peripheral surface of the upper end portion of the body portion 2 of the pressure vessel 1 so as to be subjected to a pressure test air pressure to be described later. The concave curved surface of the partition wall 10 faces the side.

Next, as shown in FIG. 7, a new body portion 30 is installed on the upper end portion of the existing body portion 2, and the lower end portion of the body portion 30 and the upper end portion of the existing body portion 2 are welded and joined. To do. This trunk portion 30 is the update portion 30 in the present embodiment.
The barrel portion 30 which is the renewal portion 30 has a shape equal to the size of the removed barrel portion 5. Further, a joining portion (welded portion) 30 a between the upper end of the body portion 2 and the lower end of the body portion 30 is located above the partition wall 10 including the missing ball ring 11 and the missing ball end plate 12.
Next, the scaffold 31 is installed above the center of the new trunk portion 30 in the vertical direction.

Next, as shown in FIG. 8, a plurality of ring pieces 21 a and missing ball end plates 22 that are constituent members of the partition wall 20 are temporarily placed on the scaffold 31. In this case, the ring piece 21 a is temporarily placed along the inner peripheral surface of the barrel portion 30, and the missing spherical end plate 22 is temporarily placed at the center portion of the barrel portion 30 in plan view.
The plurality of ring pieces 21a and the missing ball end plate 22 constituting the missing ball ring 21 are carried in advance from the factory to the site.

  Next, as shown in FIGS. 9 and 10, the existing barrel portion 6 that has been temporarily placed in an appropriate place is lifted by a crane or the like and installed on the barrel portion 30. And the upper end of the body portion 30 are welded together.

  Next, as shown in FIG. 10, the missing spherical end plate 22 temporarily placed on the scaffold 31 is lifted by a chain block 32 and held on the trunk portion 6. The lifted spherical end plate 22 is positioned above the joint (welded portion) 30b between the body portion 30 and the body portion 6.

Next, as shown in FIG. 11, the ring piece 21a temporarily placed on the scaffold 31 is joined to the trunk portion 6 in the same manner as when the ring piece 11a is joined to the inner peripheral surface of the trunk portion 2 by welding. Are welded and joined to the inner peripheral surface of the lower end portion.
That is, the ring pieces 21a are welded to the inner peripheral surface of the lower end portion of the trunk portion 6 along the circumferential direction. Thereafter, the ring-shaped ring 21 is formed on the inner peripheral surface of the lower end portion of the trunk portion 6 by welding the adjacent ring pieces 21a and 21a.

Next, as shown in FIG. 12, the missing ball end plate 22 is welded so as to close the inside of the missing ball ring 21. In this case, the suspended missing spherical end plate 22 is suspended with its convex curved surface facing upward, and the outer peripheral portion of the end plate main body 22 a is placed on the inner peripheral edge of the missing spherical ring 11 from above the missing spherical ring 21. Weld on top.
In this case, as shown in FIG. 6 (b), the outer peripheral edge of the end plate body 22 a and the portion slightly inside the inner peripheral edge of the missing ring 21 are welded. Further, the inner peripheral edge of the missing ball ring 21 and a portion slightly inside the outer peripheral edge of the end plate body 22a are welded, and further, the center portion of the portion where the end plate body 22a and the missing ball ring 21 overlap is plug welded. Good.

  The partition wall 20 configured in this manner is formed in a spherical shape, and its outer peripheral portion is joined to the inner peripheral surface of the lower end portion of the body portion 6 of the pressure vessel 1 so that a pressure test air pressure described later is applied. The concave curved surface of the partition wall 20 faces the side.

Thus, by providing the partition walls 10 and 20 in the pressure vessel 1, the inside of the pressure vessel 1 has two hollow spherical partition walls 10 that intersect the axial direction of the pressure vessel 1 as shown in FIG. 13. , 20 in an axial direction, whereby the interior of the pressure vessel 1 is divided into three chambers 1a, 1b, 1c.
Of these chambers 1 a, 1 b and 1 c, the chamber 1 a includes the renewal portion 30.

Next, the pressure applying means 40 is attached to the pressure vessel 1.
The pressure applying means 40 applies a pressure test pressure by air to the chamber 1a including the renewal portion 30, and is lower than the pressure test pressure in the chambers 1b and 1c not including the renewal portion 30 adjacent to the chamber 1a. A design pressure is applied by high-pressure air from the outside of the pressure vessel 1.

  The pressure applying means 40 includes a compressor 41, a pipe line 42 for sending compressed air from the compressor 41 to the chamber 1a, a pipe line 43 for sending compressed air from the compressor 41 to the chambers 1b and 1c, and the pipe line 42 and the pipe line 43. The connecting line 44 is connected to the connecting line 44, the valve 45 is provided on the compressor 41 side from the connecting part to the connecting line 44, and the connecting line 44 is provided with the valve 46.

Therefore, in such a pressure applying means 40, both the valves 45 and 46 are opened, and compressed air is sent from the compressor 41 to the chambers 1a, 1b, and 1c through the pipe line 42, the connection pipe line 44, and the pipe line 43. These chambers 1a, 1b, and 1c can be pressurized to the design pressure.
Then, the pressure test pressure can be applied to the chamber 1a by closing the valve 46 and further sending compressed air from the compressor 41 to the chamber 1a. The pressure test pressure is 1.25 times the design pressure.

  In this way, a pressure test pressure by air is applied to the chamber 1a including the renewal portion 30, and the chambers 1b and 1c not including the renewal portion 30 adjacent to the chamber 1a are lower than the pressure test pressure and are pressure vessels. A pressure test of the pressure vessel 1 in the renewal portion 30 is performed by applying a design pressure with a high-pressure gas from the outside of 1.

  After completion of the pressure resistance test, the valves 45 and 46 are opened, and the chambers 1a, 1b and 1c are decompressed to normal pressure. At that time, the valves 45 and 46 are opened with care so that the chamber 1a does not become negative pressure.

Next, the missing ball rings 11 and 21 constituting the partition walls 10 and 20 are cut, the lid 22b of the manhole portion 22c of the missing ball end plate 22 is removed, and the missing ball rings 11 and 21 are cut from the manhole portion 22c. Unload the piece to the outside.
In this case, as shown in FIG. 14, the existing barrel portion 2 and barrel portion 6 are separated from the missing ball rings 11 and 21 by 10 to 16 mm.

As described above, according to the present embodiment, the inside of the pressure vessel 1 is divided into the three chambers 1a, 1b, and 1c by the partition walls 10 and 20, and the pressure test pressure by air is applied to the chamber 1a including the renewal portion 30. Therefore, pressure resistance test pressure is applied to the entire body 2 of the chamber 1a including the renewal portion 30. Therefore, it is possible to perform the pressure vessel test of the pressure vessel in the renewal portion 30 easily and surely without taking time and effort required for the conventional pressure test.
Further, since the design pressure is applied to the chambers 1b and 1c not including the renewal portion 30 adjacent to the chamber 1a including the renewal portion 30 by air having a pressure lower than the pressure resistance test pressure and high pressure from the outside of the pressure vessel 1. , 20 is a pressure obtained by subtracting the design pressure from the pressure resistance test pressure. Therefore, the soundness of the partition walls 10 and 20 can be maintained without applying an excessive pressure test pressure to the partition walls 10 and 20, and as a result, a reliable pressure test of the pressure vessel 1 can be performed.

  Further, the partition walls 10 and 20 are formed in a spherical shape, and the outer peripheral portion thereof is joined to the inner peripheral surface of the body portion 2 of the pressure vessel 1 so that the partition walls 10 and 20 are disposed on the side of the chamber 1a where the pressure test air pressure is applied. Since the concave curved surface faces, the pressure resistance test pressure acts equally on the concave curved surface, and the design pressure acts evenly on the convex curved surface on the back side of the partition walls 10 and 20, so that the thickness of the partition walls 10 and 20 is equalized. And can be made as thin as possible.

  Further, the missing spherical partition walls 10, 20 are fixed to the missing ball rings 11, 21, which are joined to the inner peripheral surface of the body portion 2 of the pressure vessel 1, and the missing ball ring 21, 21. 11 and 21, which are configured by joining the ring pieces 11 a and 21 a divided into a plurality of parts in the circumferential direction. The ring pieces 11a and 21a carried into the site are joined to the inner peripheral surface of the body 2 of the pressure vessel 1 so as to form the missing ball rings 11 and 21 and adjacent ring pieces 11a and 11a (21a and 21a). ) By joining together, the missing ball rings 11 and 21 can be easily attached to the inner peripheral surface of the body portion 2 of the pressure vessel 1 in the field. Then, the missing ball end plates 12 and 22 are fixed to the missing ball rings 11 and 21 so as to close the inner sides of the missing ball rings 11 and 21, thereby easily forming the partition walls 10 and 20 in a missing ball shape on the spot. it can.

In the present embodiment, the case where the two partition walls 10 and 20 are provided in the vertical pressure vessel 1 has been described as an example, but the present invention is not limited to this.
For example, as shown in FIG. 15 (a), in the pressure test method of the pressure vessel 1 in the updated portion 30a obtained by updating the top of the vertical pressure vessel 1, the inside of the pressure vessel 1 is formed as one missing spherical partition wall. 10 is divided into two chambers 1d and 1e by partitioning in the axial direction. Of the two chambers 1d and 1e, the chamber 1d includes an updated portion 30a, and the pressure resistance test pressure is applied to the chamber 1d including the updated portion 30a. In addition, a design pressure lower than the pressure resistance test pressure may be applied to the chamber 1e that does not include the updated portion 30a adjacent to the chamber 1d.

  Further, as shown in FIG. 15B, in the pressure test method of the pressure vessel 1 in the updated portions 30b and 30b obtained by updating the nozzle at the top of the vertical pressure vessel 1, the inside of the pressure vessel 1 is By partitioning in the axial direction by a single spherical partition 10, the chamber 1d of the two chambers 1d and 1e includes update parts 30b and 30b. The update parts 30b, A pressure resistance test pressure may be applied to the chamber 1d including 30b, and a design pressure lower than the pressure resistance test pressure may be applied to the chamber 1e not including the update portion 30b adjacent to the chamber 1d.

  Further, as shown in FIG. 15C, in the pressure test method for the pressure vessel 1 in the updated portion 30c obtained by updating the right end portion of the horizontal pressure vessel 1, the inside of the pressure vessel 1 has a single spherical shape. By partitioning in the axial direction by the partition wall 10, the chamber 1d is divided into two chambers 1d and 1e, and the chamber 1d of the two chambers 1d and 1e includes an updated portion 30c, and a pressure resistance test is performed on the chamber 1d including the updated portion 30c. While applying pressure, a design pressure lower than the pressure resistance test pressure may be applied to the chamber 1e not including the renewal portion 30c adjacent to the chamber 1d.

  Further, as shown in FIG. 15D, in the pressure test method of the pressure vessel 1 in the updated portion 30d obtained by updating the nozzle at the right end of the horizontal pressure vessel 1, the inside of the pressure vessel 1 is By partitioning in the axial direction by the partition wall 10, the two chambers 1d and 1e are divided into two chambers 1d and 1e. The chamber 1d of the two chambers 1d and 1e includes an updated portion 30d. In addition, a design pressure lower than the pressure resistance test pressure may be applied to the chamber 1e that does not include the updated portion 30d adjacent to the chamber 1d.

Further, as shown in FIG. 15 (e), in the pressure test method for the pressure vessel 1 in the updated portion 30e obtained by updating the lower end portion of the vertical pressure vessel 1, the inside of the pressure vessel 1 has a single spherical shape. The two chambers 1f and 1g are divided into two chambers 1f and 1g by partitioning in the axial direction by the partition wall 20 of the two chambers, and the chamber 1f of the two chambers 1f and 1g includes an update portion 30e. While applying the test pressure, a design pressure lower than the pressure resistance test pressure may be applied to the chamber 1g not including the renewal portion 30e adjacent to the chamber 1f.
In this case, when the skirt portion provided at the lower end portion of the pressure vessel 1 and supporting the pressure vessel 1 is updated, the internal pressure in the pressure vessel 1 does not act on the updated portion 1s of the skirt portion.

  Further, in the present embodiment, the partition walls 10 and 20 are all formed in a spherical shape, but the present invention is not limited to this. For example, the partition wall may be formed in a flat plate shape or other shape as long as the partition wall can maintain its soundness when a pressure obtained by subtracting the design pressure from the pressure resistance test pressure is applied to the partition wall.

  In the present embodiment, the pressure vessel pressure resistance test method according to the present invention has been described by taking as an example the case where the cylindrical barrel portion 5 is replaced with a new barrel portion (updated portion) 30 at once. The present invention can also be applied to an apparatus in which the body portion is sequentially updated by repeatedly cutting and removing the portion in the circumferential direction and repeatedly attaching a new partial body plate to the opening generated by the removal. In this case, the members (ring pieces 11a and 21a, missing spherical end plates 12 and 22) constituting the partition walls 10 and 20 may be carried into the body from the opening.

DESCRIPTION OF SYMBOLS 1 Pressure vessel 1a, 1b, 1c, 1d, 1e, 1f, 1g Chamber 2 trunk | drum 10,11 Partition 11,21 Missing ring 12,22 Missing endplate 30,30a, 30b, 30c, 30d, 30e Update part

Claims (6)

A pressure vessel pressure test method in an updated part obtained by remodeling or updating a part of a cylindrical pressure vessel whose both ends are closed,
The inside of the pressure vessel is divided into a plurality of chambers by partitioning in the axial direction by at least one partition wall intersecting the axial direction of the pressure vessel,
At least one chamber of the plurality of chambers includes the update portion;
A pressure test pressure by gas is applied to the chamber including the renewal portion, and a predetermined pressure is applied to the chamber not including the renewal portion adjacent to the chamber by a gas having a pressure lower than the pressure test pressure and higher than the outside of the pressure vessel. A pressure test method for a pressure vessel, wherein pressure is applied.   The partition wall is formed in a spherical shape, and its outer peripheral portion is joined to the inner peripheral surface of the body portion of the pressure vessel, and the concave curved surface of the partition wall faces the chamber side to which the pressure test pressure is applied. The pressure resistance test method for a pressure vessel according to claim 1. A pressure test apparatus used in the pressure test method for a pressure vessel according to claim 1 or 2,
By partitioning the inside of the pressure vessel in the axial direction of the pressure vessel, a plurality of chambers are formed inside the pressure vessel so that at least one of the chambers includes the renewal portion. When,
A pressure test pressure by gas is applied to the chamber including the renewal portion, and a predetermined pressure is applied to the chamber not including the renewal portion adjacent to the chamber by a gas having a pressure lower than the pressure test pressure and higher than the outside of the pressure vessel. And a pressure applying means for applying a pressure.   The partition wall is formed in a spherical shape, and its outer peripheral part is joined to the inner peripheral surface of the body of the pressure vessel, and the concave curved surface of the partition wall faces the chamber side where the pressure test air pressure is applied. The pressure vessel pressure resistance test apparatus according to claim 3, wherein The missing spherical partition includes a ring-shaped missing ball ring joined to the inner peripheral surface of the body portion of the pressure vessel, and a missing ball end plate fixed to the missing ball ring and closing the inside of the missing ball ring; With
5. The pressure vessel pressure test device according to claim 4, wherein the missing ring is configured by joining ring pieces divided into a plurality in the circumferential direction thereof. A construction method for constructing the pressure vessel pressure test apparatus according to claim 5,
Carrying the missing ball ring divided into the ring pieces and the missing ball end plate to the site where the pressure vessel is installed;
Next, the ring pieces are welded to the inner peripheral surface of the body portion of the pressure vessel so as to constitute the missing ball ring, and adjacent ring pieces are welded and joined together,
Next, the partition wall is provided by welding the missing ball end plate so as to close the inside of the missing ball ring welded to the inner peripheral surface of the body part,
Next, the pressure container is attached to the pressure vessel, and the pressure vessel pressure test apparatus construction method is provided.

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