Patent Application
20230058589
The present invention relates to a technology of determining an arrangement of devices included in a processing plant.
Processing plants configured to process fluid include, for example, natural gas plants configured to liquefy natural gas or separate and recover natural gas liquid, petroleum refining plants configured to distill or desulfurize crude oil or various intermediates, and chemical plants configured to produce petrochemical products, intermediate chemicals, or polymers. In this application, the “fluid” includes, in addition to gas and liquid, granular materials (powder, grains, pellets, and the like) having flowability.
Those processing plants each have a configuration in which a large number of devices are arranged in a predetermined installation area and those devices are connected to each other by pipes. Examples of the large number of devices include static devices such as columns, tanks, and heat exchangers, and dynamic devices such as pumps and compressors. At this time, designers have been required to determine the arrangement of the large number of devices included in the processing plant through trial and error with comprehensive consideration of, for example, the order to process the fluid, restrictions on a landform and area of the installation area, restrictions in terms of safety, and use amounts of materials for forming the devices and pipes (economic efficiency).
However, a processing plant in which a large number of devices are connected to each other via pipes often has a complicated configuration. At this time, not only work of searching for a more efficient device arrangement within a range of a large number of restrictions tends to require a large load for investigation, but also a result of the work may depend on the skill of the designer. Therefore, there has been a demand for a method with which, while the load of the work required for determining the device arrangement is reduced, the economic efficiency of the determined device arrangement can be quantitatively grasped.
In Patent Literature 1, there is described a natural gas processing apparatus in which a range in which the devices are actually arranged is limited within a device arrangement area set in advance so as to correspond to a range of a working radius of a maintenance crane, which is determined in accordance with a lifting load. In Patent Literature 1, however, there is no reference about the technology of quantitatively grasping the economic efficiency of the determined device arrangement.
[PTL 1] WO 2018/235267 A1
The present technology provides a technology of searching for an arrangement having a smaller total use amount of a pipe material for device groups each including devices included in a processing plant.
According to one embodiment of the present invention, there is provided a method of arranging devices of a processing plant configured to process fluid, the method including the steps of: dividing a plurality of devices included in the processing plant into a plurality of device groups which are distinguishable from one another, and each include at least one device and each have set therefor an occupied area including an arrangement area for the at least one device, and setting, for the plurality of device groups, connection information representing that, in order to transfer the fluid between each device included in one device group and a counterpart device included in another device group, two specific device groups are connected and paired via a pipe, and pipe information required for calculating a use amount of a pipe material per unit length of the pipe corresponding to the connection information; setting an installation area of the processing plant, and a pipe-rack arrangement area having a band-like planar shape of a pipe rack to be provided in the installation area to support the pipe; and repeatedly executing, by a computer, a first step and a second step while changing an arrangement of the plurality of device groups to obtain a plurality of arrangements, and selecting a plurality of arrangements having small total use amounts of the pipe materials from the obtained plurality of arrangements, the first step including arranging the plurality of device groups in the installation area so that an outer edge of the occupied area of the one device group is brought into contact with a long side of the pipe-rack arrangement area having the band-like planar shape and so that the occupied area of the one device group and the occupied area of another device group are prevented from overlapping each other, the second step including calculating, for the arrangement of the plurality of device groups, the total use amount of the pipe material of the pipe to be supported by the pipe rack based on a position at which the outer edge of each occupied area is brought into contact with the long side and on the connection information.
The method of arranging devices of a processing plant may include the following features.
Further, according to one embodiment of the present invention, there is provided a method of manufacturing a processing plant configured to process fluid, the method including a step of arranging a plurality of device groups based on an arrangement included in a plurality of arrangements having small total use amounts of pipe materials, which are selected by the method of arranging the devices of the processing plant described above, to thereby manufacture the processing plant.
According to this method, regarding the arrangement of the device groups obtained by dividing the large number of devices included in the processing plant, the computer obtains arrangements having small total use amounts of pipe materials. As a result, the economic efficiency of the determined device arrangement can be quantitatively grasped while the load of the work required for determining the device arrangement is reduced.
As the processing plant 1 to which the device arrangement method of this example is applicable, there can be exemplified, for example, the natural gas plants, the petroleum refining plants, and the chemical plants described above. Those processing plants 1 each include a large number of devices 31 configured to process fluid such as gas, liquid, or granular materials having flowability. As examples of the devices 31 to be provided in the processing plant 1, there can be exemplified static devices such as various processing columns, for example, a fractionator column and a reaction column, and receiver tanks and heat exchangers in which gas-liquid separation is performed. There can also be exemplified dynamic devices such as pumps and compressors. The devices 31 provided in the processing plant 1 are connected to each other via pipes 4 through which the fluid is allowed to flow.
When the processing plant 1 is constructed in an installation area 10 set in advance, and the large number of devices 31 included in the installation area 10 are arranged in a disordered state, the pipes 4 for connecting the devices 31 to each other are increased in length, and a total use amount of a pipe material is increased. Further, also from the viewpoints of maintenance management and safety management, the devices 31 are desired to be arranged in order based on the way of thinking set in advance.
Therefore, in the processing plant 1 in which the large number of devices 31 are provided, the devices are divided into groups (hereinafter referred to as “device groups 3”) in accordance with the order to process the fluid or relevance between the devices 31, and the devices 31 included in a common device group 3 may be collectively arranged in a unit area. The above-mentioned “unit area” is hereinafter referred to as “occupied area 30.”
For example,
There is no particular limitation on a method of dividing the large number of devices 31 provided in the processing plant 1 into the plurality of device groups 3 as in the example illustrated in
Further, the applicant is developing a method involving analyzing, by a computer, the relevance between the devices 31 based on data on a piping & instrument flow diagram created when the processing plant 1 is designed, and performing grouping so that the devices 31 having high relevance are included in the common device group 3. As described above, through use of a computer, the devices 31 may be automatically divided into groups based on a predetermined algorithm.
Moreover, in some cases, dynamic devices such as pumps and compressors, or packed columns having catalyst or adsorbents packed therein are provided redundantly in such a manner that a plurality of same devices are provided to allow switching and use at the time of maintenance, regeneration of the packing, and replacement, for example. Those redundant devices are often provided in the common device group 3.
Further, like a surge tank at an outlet of a compressor, there are also devices 31 designed on the premise that the devices 31 are provided at positions close to each other. In order to prevent the devices 31 of those types from being separated into different device groups 3 at the time of grouping, those devices 31 may be regarded as a set corresponding to one device 31, or those devices 31 may be set as one device group 3 in advance.
When the device group 3 includes a plurality of devices 31, the pipes 4 for connecting the devices 31 included in the common device group 3 to each other are arranged in the common occupied area 30 in which the device group 3 is arranged.
Meanwhile, the pipes 4 for connecting the devices 31 included in different device groups 3 to each other are arranged so as to pass through, in principle, pipe racks (main pipe rack 21, sub-pipe rack 22, and sub-sub-pipe rack 23) outside of the occupied area 30. The pipe racks 21, 22, and 23 are framework structures each configured to support the pipes 4 and formed into a band shape in plan view. In this example, an area having a band-like planar shape in which the pipe rack 21, 22, or 23 is to be arranged is referred to as “pipe-rack arrangement area 20.”
As described above, the large number of devices 31 provided in the processing plant 1 are divided into a plurality of device groups 3, and the devices 31 included in each device group 3 are arranged in a common occupied area 30. In this manner, for example, devices 31 that are relevant to each other can be arranged at positions close to each other. As a result, as compared to a case in which the large number of devices 31 are arranged in a disordered state, excessive increase in length of the pipes 4 for connecting the devices 31 to each other can be suppressed, and the total use amount of the pipe material can be suppressed.
Meanwhile, in the processing plant 1 including the large number of devices 31, a large number of device groups 3 may be obtained after the grouping, and those device groups 3 may be able to be arranged in the common installation area 10 in a large number of patterns. Further, the length of the pipe 4 for connecting the devices 31 included in different device groups 3 to each other changes depending on arrangement positions of those device groups 3. Further, pipes 4 having different diameters and thicknesses also vary in use amount of a pipe material. Further, a pipe cost per unit weight varies as the selected pipe material is changed.
As described above, the total use amount or a total cost of the pipe material, which affects a construction cost of the processing plant 1, changes complicatedly depending on the pattern of the arrangement of the devices 31. Therefore, a considerable labor is required for the designer involved in the arrangement of the devices 31 in the processing plant 1 to search for an arrangement of the devices 31 having a smaller value in total use amount or total cost of the pipe material of the pipes 4 through trial and error. Further, the result may depend on the skill of the designer.
In view of the above, the device arrangement method of this example uses a computer to search for an arrangement of the device groups 3 having a smaller total use amount (which may be converted into total cost, the same holds true in the following) of the pipes 4 to be arranged to pass through the pipe racks 21, 22, and 23.
This problem can be understood as an optimization problem for searching for an arrangement having a smaller total use amount of the pipe material of the pipes 4 to be supported by the pipe racks 21, 22, and 23 when the plurality of device groups 3 are arranged in the installation area 10 of the processing plant 1.
The area installation area 10 is an area in which the occupied areas 30 and the pipe-rack arrangement areas 20 are arranged. The installation area 10 has coordinates set therein so that an area in which the occupied area 30 or the pipe-rack arrangement area 20 is arranged can be specified. In
Further, it is not essential to arrange, in the installation area 10, all of the devices 31 included in the processing plant 1 based on the device arrangement method of this example. For example, regarding devices having predetermined arrangement positions, for example, devices for receiving raw materials from the outside, areas in which those devices are arranged may be excluded when the shape of the installation area 10 is set. The device arrangement area to be excluded from the installation area 10 may be set like an enclave inside the installation area 10.
Further, the pipe-rack arrangement areas 20 are set for the installation area 10 in advance. The arrangement positions of the pipe racks 21, 22, and 23 and the number of pipe racks 21, 22, and 23 to be arranged can be changed when the arrangement of the device groups 3 is searched for. Details thereof are described later.
As described above, the devices 31 of the processing plant 1 to be arranged in the installation area 10 are divided into a plurality of device groups 3 in advance. The device groups 3 are distinguishable from one another, and identification numbers of from “ (1)” to “(25)” are assigned thereto in the example illustrated in
For each device group 3, an area and an outer-edge shape of the occupied area 30 are set in consideration of, for example, the number of devices 31 to be arranged, the size of each device 31, and an arrangement interval between the devices 31, which is set from the viewpoints of maintenance management and safety management. The outer-edge shape of the occupied 30 is also not limited to a rectangular shape exemplified in
In this case, the area and the outer-edge shape of the occupied area 30 can be specified by determining a specific arrangement of devices 31 to be provided in the corresponding occupied are 30. At this time, a framework having a plurality of floors may be provided in the occupied area 30 so that the devices 31 are installed separately in those plurality of floors.
However, determining the specific arrangement of the devices 31 is not an essential requirement to specify the area and the outer-edge shape of the occupied area 30. For example, the area and the outer-edge shape of the occupied area 30 may be automatically calculated simply based on variables such as the number of devices 31 to be provided in the occupied area 30, the size of each device 31 (area of occupation), the arrangement interval between the devices 31, and presence or absence of the framework and the number of floors thereof.
In the above-mentioned process, a plurality of devices 31 relevant to the fractionator column 311a on the front-stage side are grouped as the device group 3a, and a plurality of devices 31 relevant to the fractionator column 311b on the rear-stage side are grouped as the device group 3b.
In this case, when attention is paid to the flow of the liquid from the receiver 313a to the fractionator column 311b, the liquid feed pump 314 being the device 31 included in the device group 3a and the fractionator column 311b being the device 31 included in the device group 3b are connected to each other via the pipe 4. At this time, in the device arrangement method of this example, the device group 3a and the device group 3b are regarded as being paired via the pipe 4.
Further, as illustrated in
As information representing the relationship described above, each device group 3 illustrated in
As the connection information, there is set information that allows identification of via which pipe 4 a specific device 31 (in the example of
Similarly, also regarding one device group 3 (in the example of
When any one device group 3 includes a plurality of devices 31 connected to devices 31 included in other device groups 3 via pipes 4, a plurality of pieces of the above-mentioned connection information are set so as to correspond to those devices 31.
Further, there may be a case in which the pipe 4 connected to one device 31 included in a certain device group 3 is branched at the outside of the corresponding device group 3 to be connected to devices 31 included in a plurality of other device groups 3, respectively. In this case, the connection information may be set supposing that the one device 31 is connected to each of the other devices 31 via a plurality of pipes 4 different from each other.
Further, for the pipe 4 corresponding to the connection information, information corresponding to a use amount of a pipe material per unit length is set as pipe information in accordance with the diameter and the thickness of the corresponding pipe 4. Further, when the total cost is calculated as the total use amount of the pipe 4, pipe materials are further taken into consideration to set the cost per unit length of the pipe 4 as the pipe information. Those pieces of pipe information are not required to directly indicate the actual use amount (weight) or price of the pipe material per unit length, and may be, for example, identification information set in association with those values.
Description is now given with reference to
As a restriction condition for the arrangement of the occupied areas 30, in the installation area 10, the next occupied area 30 cannot be arranged with an overlap in areas in which the pipe-rack arrangement areas 20 are arranged in advance or areas in which other occupied areas 30 are arranged in advance.
When the connection side 301 is set, each occupied area 30 is arranged in the installation area 10 so that the corresponding connection side 301 is brought into contact with a long side of the pipe-rack arrangement area 20. When the connection side 301 is not set, each occupied area 30 is arranged in the installation area 10 so that any side thereof that can have an interface for the pipe 4 with the pipe rack 21, 22, or 23 (which is generally a straight line but may be a curved line) is brought into contact with the long side of the pipe-rack arrangement area 20.
As long as the occupied area 30 can be arranged so that the side thereof corresponding to the interface for the pipe 4 (for example, the connection side 301) is brought into contact with the long side of the pipe-rack arrangement area 20, a part of the occupied area 30 may be allowed to protrude from the installation area 10 (occupied area 30 of (3) of
In those examples, the fluid to be processed flows from a position indicated by reference symbol “IN” of
Meanwhile, positions in “(4) → (1) → (3) →OUT” are connected by pipes B having set therefor pipe information that is different from that for the pipes A (in
Then, within the coordinates of the installation area 10, directions of the occupied areas 30 of “(1)” to “(4)” and coordinate ranges to be occupied by those occupied areas 30 are determined based on the above-mentioned restriction. With this, there is obtained a state in which the device groups 3 are arranged in the installation area 10. Then, the pipes 4a and 4b are arranged so that the pipes 4a and 4b pass through the pipe-rack arrangement areas 20 (main pipe racks 21 and 22) and connect the connection sides 301 (including the positions of “IN” and “OUT” of the installation area 10) by the shortest path.
In this case, from the viewpoint of searching for the arrangement of the device groups 3 having a smaller total use amount of the pipes 4 (4a and 4b), it is only required to grasp the influence of the change in length of the pipe 4 based on the difference in arrangement of the device groups 3. Therefore, it is not essential to strictly specify the actual length of the pipes 4 to be used at this stage of searching for the optimum arrangement.
From this viewpoint, it may be enough as long as there can be set, as the “shortest path” of each of the pipes 4a and 4b, a path of the pipe 4 that connects between interface positions of each device group 3 (or a position of “IN” or “OUT,” the same holds true hereinafter in the description of
Description is further given here of the interface positions of each device group 3 and the pipe rack 21 or 22. For example, when a specific arrangement of the devices 31 to be provided in the occupied area 30 has been determined, interface positions close to the actual positions may be set in accordance with the arrangement. Further, when a specific arrangement of the devices 31 in the occupied area 30 has not been determined, for example, a simple setting of uniformly setting center positions of the connection sides 301 as the interface positions may be performed.
With the above-mentioned method, the paths in which the pipes 4a and 4b are arranged are determined so as to correspond to the arrangement of the device groups 3, and the length of each of the pipes 4a and 4b can be calculated based on the coordinates of the paths. Then, the lengths of the pipes 4a and 4b for connecting the device groups 3 to each other are added for each type of pipe, and thus the total length of each of the pipes A and B can be calculated.
For example, in the example illustrated in
In contrast, in the example illustrated in
After the total lengths of the various pipes 4a and 4b are calculated, the use amount or the cost of the pipe material per unit length is multiplied based on the pipe information set for each of the pipes A and B. In this manner, the total use amount or the total cost of the pipe material of the pipes 4a and 4b can be calculated in accordance with the difference in arrangement of the device groups 3.
As described above, the device arrangement method of this example uses the computer to repeatedly perform the above-mentioned calculation while changing the arrangement positions of the device groups 3, to thereby search for the arrangement of the device groups 3 having a smaller total use amount or total cost of the pipes 4a and 4b.
In the examples described with reference to
In those cases, in order to prevent the calculation amount of the computer from becoming excessively large, the optimum arrangement of the device groups 3 may be searched for with various restrictions described below being provided.
Parts (a) to (c) of
In the main pipe rack 21, short sides of the band-shaped pipe-rack arrangement area 20 are independently provided without being connected to other pipe racks. In the examples illustrated in parts (a) to (c) of
The arrangement direction of the main pipe rack 21, the lengths of the long side and the short side of the band-shaped pipe-rack arrangement area 20, and the number of main pipe racks 21 to be arranged are not limited to those of the examples of
The sub-pipe rack 22 is a pipe rack in which a short side of the band-shaped pipe-rack arrangement area 20 is connected to a long side of the pipe-rack arrangement area 20 of the main pipe rack 21, and which extends in a direction of intersecting with the long side. Part (a) of
In this case, the lengths of the long side and the short side of the pipe-rack arrangement area 20 of the sub-pipe rack 22 and the number of sub-pipe racks 22 to be arranged may also be changed for each case.
As exemplified in parts (a) to (c) of
Meanwhile, fixing the arrangements of the main pipe racks 21 and the sub-pipe racks 22 only to those positions exemplified in
For example, part (a) of
Further, in the example illustrated in part (a) of
The movement of the position of each pipe-rack arrangement area 20 described above is executed by a computer when the optimum arrangement of the device groups 3 is searched for.
As compared to part (a) of
Meanwhile, the movable range of the pipe-rack arrangement area 20 of the sub-pipe rack 22 is set similarly to that of the example of part (a) of
In addition to the examples illustrated in parts (b) and (c) of
As described above, for the case of part (c) of
Further, the case is not limited to the case of part (c) of
Those cases and sub-cases are similar to the examples described with reference to parts (a) to (c) of
In the device arrangement method of this example, the optimum arrangement of the device groups 3 is searched for through use of a computer for each of the plurality of cases and sub-cases described above. As described above, there are prepared in advance cases and sub-cases in which the number of main pipe racks 21 and sub-pipe racks 22 to be arranged, the connection relationships thereof, and the movable range of the pipe-rack arrangement area 20 are limited in advance. In this manner, the calculation amount can be reduced as compared to a case in which the searching for the optimum arrangement of the device groups 3 is started from a state in which those conditions are not defined at all.
When the connection side 301 is not set in advance conversely, any side of the occupied area 30 may be connected to the long side of the pipe rack 21, 22, or 23. However, when the connection side 301 is set in advance, the calculation amount of the computer can be reduced when the optimum arrangement of the device groups 3 is searched for.
Further, in
Further, in the occupied area 30 in which the connection side 301 is not set in advance, a side selected to be connected to the long side of the pipe rack 21, 22, or 23 (pipe-rack arrangement area 20) is set as the connection side. Then, the above-mentioned maintenance area 5 may be provided in an area on the opposite side of this connection side across the occupied area 30. This point is similar to that of the example illustrated in
In addition, as illustrated in
In light of the restrictions and the installation cases of the main pipe racks 21 and the sub-pipe racks 22 described above, in the device arrangement method of this example, the arrangement positions of the occupied areas 30 of the plurality of device groups 3 and the arrangement positions of the pipe-rack arrangement areas 20 of the pipe racks 21, 22, and 23 are set as variable parameters. In other words, in the installation area 10, coordinate ranges to be occupied by the occupied areas 30 and the pipe-rack arrangement areas 20 are set as variable parameters.
Then, the variable parameters are changed for each of the cases and sub-cases prepared in advance. Thus, for each of the cases and sub-cases, the arrangement of the device groups 3 having a smaller total use amount or total cost of the pipes 4 is searched for.
The searching for the arrangement of the device groups 3 satisfying such conditions can be executed by a computer through use of commercially-available and general-purpose optimization software. Examples of such software include modeFRONTIER of ESTECO, HyperStudy of Altair, Optimas of Noesis Solutions, and HEED of Red Cedar Technology. In this case, it is not an essential requirement to execute the searching for the optimum arrangement of the device groups 3 through use of general optimization software, and the optimal arrangement may be searched for through use of a specifically-developed search tool.
The optimum arrangement can be searched for through use of such optimization software or search tool by means of a genetic algorithm or a particle swarm optimization method. As specific examples of the algorithm for executing those optimization methods, there can be exemplified Neighborhood Cultivation Genetic Algorithm (NCGA), Normal Boundary Intersection (NBI), and Indirect Optimization on the basis of Self-Organization (IOSO). However, the searching for the optimum arrangement is not limited to the case of using those exemplified methods, and any method that can search for the arrangement of the device groups 3 having a small total use amount or total cost of the pipes 4 can be used.
Further, in the device arrangement method of this example, the computer, which is configured to search for the optimum arrangement of the device groups 3 by means of the above-mentioned method, selects, from the found arrangements of the device groups 3, a plurality of arrangements having smaller total use amounts or total costs of the pipe materials of the pipes 4, and outputs the selected arrangements to a user.
As the arrangements to be selected, a preset number of arrangements may be output in the order of a smaller target value (total use amount or total cost) among the respective cases (including the sub-cases). Further, all arrangements having a target value smaller than a threshold value set in advance may be selected and output.
First, the plurality of devices 31 included in the processing plant 1 are divided into a plurality of device groups 3 in advance, and the area and the outer-edge shape of the occupied area 30 are determined in advance for each device group 3.
After that, for the plurality of device groups 3, the connection information representing that two specific device groups 3 are paired via the pipe 4 and the pipe information for the corresponding pipe 4 are set based on the way of thinking described with reference to
Then, there are prepared a plurality of cases (including sub-cases, the same holds true hereinafter in the description of
After that, for a predetermined case, the plurality of device groups 3 are arranged in the installation area 10 with the arrangement positions of the occupied areas 30 and the pipe-rack arrangement areas 20 being set as variable parameters (processing P3 of
At this time, for example, when an area for arranging the occupied area 30 cannot be secured, the arrangement positions of the pipe-rack arrangement areas 20 may be changed within a range of the restriction described with reference to
Then, for the arrangement of the device groups 3 obtained in the first step, the total use amount or the total cost (target value) of the pipe material of the pipes 4 is calculated based on the above-mentioned connection information and pipe information (processing P4 of
After that, the first and second steps are repeated until an end condition set in advance (for example, a case in which, during a predetermined repetitive calculation period, an arrangement of the device groups 3 having a target value smaller than those of other arrangements cannot be found any more) is satisfied.
Further, when the first and second steps are executed, for example, as in the case 1 of part (a) of
For the case for which the searching is thus executed, when the end condition is achieved, a plurality of arrangements of the device groups 3 having small target values are stored. After that, the execution of the above-mentioned first and second steps is repeated while changing the case for which the optimum arrangement is searched for.
After the searching for the optimum arrangement of the device groups 3 is completed for all of the prepared cases, combinations of cases and arrangements of the device groups 3 having smaller total use amounts or total costs of the pipe materials, which have been stored, are output (processing P5 of
From the plurality of output arrangements of the device groups 3, the user selects a more realistic arrangement of the device groups 3 in consideration of restrictions such as maintenance management and safety management, and cost factors other than the total use amount or the total cost of the pipe material. After that, the arrangement of the device groups 3 is adjusted in light of also the various restrictions described above. As a result, as illustrated in
The arrangement of the devices 31 included in the processing plant 1 is determined based on the arrangement of the device groups 3 determined as described above, and the processing plant 1 is constructed based on this arrangement.
According to the device arrangement method of this embodiment, regarding the arrangement of the device groups 3 obtained by dividing a large number of devices 31 included in the processing plant 1, the computer obtains arrangements having small total use amounts or total cost of pipe materials. As a result, while the load of the work required for determining the device arrangement is reduced, the economic efficiency of the determined device arrangement can be quantitatively grasped.
In this case, it is not an essential requirement to prepare in advance the cases described with reference to
Conversely, for example, as in the example illustrated in
Further, it is not essential to set each pipe-rack arrangement area 20 to be movable in each of the cases and sub-cases described with reference to
Still further, when the processing plant 1 is constructed, it is not essential to arrange all of the pipes that have been arranged in the pipe racks 21, 22, and 23 when the optimum arrangement is searched for even in the pipe racks 21, 22, and 23 in the actual processing plant 1. For example, between devices 31 included in device groups 3 whose occupied areas 30 are arranged adjacent to each other, the pipe may connect those devices 31 without passing through the pipe rack 21, 22, or 23. It may be possible to further reduce the length of the pipe 4 as compared to a case in which the pipe 4 is routed from the arrangement position of each device 31 to the pipe rack 21, 22, or 23.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2020/016039 | 4/9/2020 | WO |
