JPH04219599A - Fluid supplying method - Google Patents

Abstract

PURPOSE:To reduce a space required for supplying fluid and the amount of work as far as possible in the case where a new pipeline for supply of another kind of fluid is installed in a pipeline system of an existing pipeline by inserting the new pipeline into the existing pipeline. CONSTITUTION:A pipeline 2 having a diameter smaller than that of an existing pipeline 1 is newly inserted into the pipeline 1. Fluid can be supplied respectively through both the existing pipeline 1 and the newly disposed pipeline 2. According to this supplying method, a space to be newly formed can be dispensed since the newly disposed pipeline is inserted into the existing pipeline. Therefore, different kinds of fluid can be supplied or a high pressure fluid can be supplied through the newly disposed pipeline so that supply quantity can be remarkably increased.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention is applicable to an increase in fluid demand at the supply destination when piping is installed as an existing pipe to supply fluids such as gas or water to the supply destination such as each household. In order to respond to requests such as supplying a different type of fluid than the fluid that was previously supplied, new piping is installed to supply a different type of fluid or the same type of fluid to the supply destination, and the fluid is supplied. The present invention relates to a fluid supply method.

0001

2. Description of the Related Art Conventionally, the following methods have been adopted in response to an increase in demand for fluid at supply destinations. That is, the first method is to increase the fluid supply amount by increasing the fluid pressure using the existing first piping,
The second method is to newly install a second pipe capable of transporting an amount of fluid commensurate with the increased amount, and use this second pipe to supply fluid. Note that in the second method, the second pipe is laid separately from the existing first pipe, so it is also possible to supply different types of fluid using the first pipe and the second pipe. .

0002

[Problems to be Solved by the Invention] However, when the first method is adopted, for example, when it is desired to increase the amount of fluid to be supplied, the following problems occur. (a) If the first piping uses a joint, there is a risk that leakage will occur or the amount of leakage will increase due to an increase in fluid pressure. (b) To prevent such fluid leakage, there is a method to prevent leakage by pasting resin or tubes on the inner surface of the piping, but this is costly and requires the fluid to be kept for a considerable period of time. It is necessary to stop the supply of

On the other hand, if the second method is adopted, the following problems occur. (b) If the second pipe is a buried pipe, especially in urban areas,
Because water, gas, sewage, electricity, and telegraph pipes and cables are intertwined underground, there is little room to install new secondary piping. (b) In addition, the installation requires road excavation work, which may cause traffic disturbances.

[0004] Therefore, an object of the present invention is to be able to respond to an increase in the amount of fluid supplied or the demand for supply of a different type of fluid, while still being able to supply the first fluid through the first piping, and to be able to supply new fluid. It is an object of the present invention to provide a fluid supply method that can minimize the space required.

[0005]

[Means for Solving the Problems] The characteristic means of the fluid supply method of the present application is to employ a piping member having a smaller diameter than the first piping as the second piping, and to insert the second piping into the first piping. , the second fluid is supplied through the second piping while maintaining the state in which the first fluid can be supplied between the first piping and the second piping, and its operation and effect. is as follows.

[0006]

[Operation] That is, in the fluid supply method of the present application, the second pipe for supplying the second fluid is arranged as an inner tube with respect to the first pipe. Here, it is natural that the second fluid is supplied to the second supply destination through the second piping, but furthermore, the first fluid is also supplied through the flow path formed between the first piping and the second piping. It will be supplied.

In other words, if the first and second fluids are the same fluid, the total amount of fluid flowing through these channels will be supplied, whereas if they are different fluids, the total amount of fluid flowing through these channels will be supplied. The fluids will be supplied separately. Now, considering the space required for transporting these fluids, in the region where the second pipe is inserted into the first pipe, this required space is only the space occupied by the first pipe. That is, in general, there is often some margin in the supply capacity of the first fluid using only the existing first piping, and there is also often some margin in the supplyable pressure of the fluid itself. Therefore, by making effective use of this surplus capacity and supply pressure, we can increase the supply pressure to solve problems such as an increase in pressure drop in the first pipe and a decrease in flow rate due to the insertion of the second pipe. If countermeasures are taken, it will be possible to properly supply fluid through the first pipe even if the second pipe is inserted.

[0008]

[Effects of the Invention] Therefore, when the fluid supply method of the present application is adopted, the second pipe runs within the first pipe. This made it possible to adjust the amount of fluid supplied and respond to the demand for supply of different types of fluids while still being able to supply one fluid.

[0009] When this method is adopted, in order to insert a new second pipe inside the existing first pipe, only the construction work (excavation work in the case of a buried pipe) is required for the insertion and removal parts. New installation space (site for buried pipes)
This makes it possible to eliminate the need for securing the pipe and laying work over the entire length of the second pipe (excavation and pipe burying work in the case of a buried pipe). In this case, only two excavations will be required, so there will be no major traffic disruption during construction.

Furthermore, for example, if the first pipe is a buried pipe,
There is no need to consider earth pressure or wheel load at the design stage for laying the second pipe, and the wall thickness of the second pipe is determined by considering only the pressure state of the second fluid supplied by the second pipe as an internal tube. This makes it possible to reduce the wall thickness of the second pipe. In this respect as well, it is possible to prevent the supply state of the first fluid from being impaired.

Furthermore, in the above characteristic means, the first fluid and the second fluid are the same fluid, and in the second pipe,
If the second fluid is supplied at a pressure higher than the supply pressure in the first pipe, it becomes possible to supply the second fluid in a high pressure state (high density state) in the second pipe. Therefore,
The total amount of fluid supplied from the first pipe and the second pipe can be significantly increased due to the marked increase in the amount of fluid supplied by the second pipe. In this case, in the second pipe,
Since it is in a high-pressure supply state, the diameter of this pipe can be made thinner, and the decrease in the supply capacity of the first pipe can be further suppressed.

[0012] As a further advantage, in this configuration, a large pressure increase in the existing pipe as the first pipe can be prevented, so the first pipe can be used in a state similar to the conventional one, and the There is no need to be concerned about leakage from the joints or an increase in the amount of leakage. Furthermore, when installing the second pipe, it is possible to eliminate the need for new measures to prevent leakage, except for the insertion and removal portions of this pipe. Further, if the second piping member is made of a flexible piping member, it is possible to cope with a case where the first piping has a bent portion.

[0013]

[Embodiment] An embodiment of the present application will be explained based on the drawings. FIG. 1 shows a state in which a second pipe 2 is inserted into an existing first pipe 1 that supplies gas g as a first fluid to a supply destination.

First, the configuration of the first pipe 1 will be explained. The first pipe 1 includes a straight channel section 1a and a pair of curved channel sections 1b provided at both ends thereof. In the figure, a predetermined gas flow rate Q1 is supplied from the first pipe inlet 3 side connected to the curved flow path portion 1b on the left side. The gas g supplied to the first pipe 1 in this way is supplied from the plurality of branch pipes 4 provided in the above-mentioned DC path section 1a to a branch supply destination 5 located at the end of these branch pipes 4. It is. Furthermore, the remaining gas flow rate Q2 of the gas flow rate Q1 is calculated from the other curved flow path portion 1b shown on the right end side of the figure.
It is discharged from the first pipe outlet 6 provided at the end of the pipe. Here, this remaining gas flow rate Q2 is supplied to the first piping downstream supply destination 7 connected to the downstream side of the first piping outlet 6 described above. The aforementioned branch supply destination 5 and first piping downstream supply destination 7 are collectively referred to as a first supply destination. Also, the supply pressure of gas g in this first pipe 1 is 100 to 230 mm.
It is about H2O. Next, the second pipe 2 inserted into the first pipe 1 described above will be explained. The second pipe 2 is formed of a straight pipe, and is configured to be inserted into the first pipe via an insertion part 2a and a take-out part 2b provided in the pair of curved flow path parts 1b. There is. This second pipe 2 supplies the liquid to a second supply destination 8 on the right side of the drawing. Also, the gas g in this second pipe 2
The supply pressure is about 1 to 3 kg/cm2.

[0015] Changes in the supply state when such a configuration is adopted (the relationship between the pipe diameters of the first and second pipes when the method of the present application is adopted, the gas supply amount in a single pipe low pressure supply state, and the second A comparison of the total gas supply of the first and second pipes 1 and 2 when the pipe 2 is provided and the second pipe 2 is in a high-pressure supply state will be described below. Example 1: Existing first piping: Size -100A (inner diameter 100mm
) Extension -100
m, without branch pipe Pressure
Force-input side: 230mmH2 O
Output side: 200mmH2
O Supply amount-160m
In the case of 3/hr, second piping: pipe type - steel pipe
Extension -100m
Pressure - Inlet side: 3kg/cm2
G
Outlet side: 1kg/cm2 Allowable pressure conditions for G first piping, (a) In the case of 250mmH2 O, the pipe size that can be adopted as the second piping is -20A (inner diameter 2
1mm) to 40A (inner diameter 39mm) The rate of increase in supply amount is up to 4 times the maximum supply flow rate (200m3/hr) of the first pipe. (b) In the case of 300mmH2O, the pipe size that can be adopted as the second pipe is -20A (inner diameter 2
1mm) to 50A (inner diameter 48mm) Increase rate of supply amount up to 5 times compared to the maximum supply flow rate (300m3/hr) of the first pipe.

Example 2: Existing first piping: Size -200A (
Inner diameter 200mm) Extension -200m, no branch pipe
Pressure - Inlet side: 230mmH2O
Output side: 2
00mmH2O Supply amount-650m3/hr Second piping: Pipe type-Steel pipe
Extension -200m
Pressure - Inlet side: 3kg/cm2
G
Outlet side: 1kg/cm2 Allowable pressure conditions for G first piping (a) In the case of 250mmH2 O, pipe size -25A (inner diameter 2
7mm) to 75A (inner diameter 72mm) Increase rate of supply amount up to 4 times the maximum supply flow rate (800m3/hr) of the first pipe. (b) In the case of 300mmH2O, the pipe size that can be adopted as the second pipe is -50A (inner diameter 4
8mm) to 100A (inner diameter 92mm) The rate of increase in supply amount is up to 5 times the maximum supply flow rate (1200m3/hr) of the first pipe.

Example 3: Existing first piping: Size -400A (
Inner diameter 400mm) Extension -500m, no branch pipe
Pressure - Inlet side: 230mmH2O
Output side: 2
00mmH2O Supply amount-2300m3/hr Second piping: Pipe type-Steel pipe
Extension -500m
Pressure - Inlet side: 3kg/cm2
G
Outlet side: 1kg/cm2 Allowable pressure conditions for G first piping (a) In the case of 250mmH2 O, pipe size -50A (inner diameter 4
8mm) to 150A (inner diameter 133mm) The rate of increase in supply amount is up to 3 times the maximum supply flow rate (3000m3/hr) of the first pipe. (b) In the case of 300mmH2O, the pipe size that can be adopted as the second pipe is -100A (inner diameter 92mm) to 200A (inner diameter 174mm).Increase rate of supply amount with respect to the maximum supply flow rate (4000m3/hr) of the first pipe Maximum 4 times.

In the above embodiment, the case where the first pipe 1 does not have the bent portion 10 etc. has been explained, but the method of the present application uses a flexible piping member as the second pipe 2 to eliminate the bent portion. It can also be applied to a piping system having 10. An example of this is shown below. FIG. 2 shows an example in which a flexible polyethylene pipe is applied as a second pipe 2 to a first pipe 1 having a branch pipe 4 and a bent portion 10. An example of such piping is shown with the same configuration as above. Example 4: First piping: Size -100A (inner diameter 100A
mm) Extension -1
00m, 3 branch pipes, 2 bends
Pressure - Inlet side: 230mmH2O
Output side: 200mmH2O
Supply amount - downstream side of first pipe: 70m3 /hr

Branch pipe side: 15
In the case of 0m3/hr Second piping: Pipe type - Polyethylene pipe
Extension -100m
Pressure - Inlet side: 3kg
/cm2 G

Output side: 1kg/cm2 G
Allowable pressure conditions for the first pipe (a) If 250 mm H2 O, the pipe size that can be adopted as the second pipe is -20A (inner diameter 2
1mm) to 40A (inner diameter 39mm) The rate of increase in supply amount is up to 6 times the maximum supply flow rate (120m3/hr) of the first pipe. (b) Permissible pressure of first pipe: 300 mmH2O In the case of 300 mm H2O, the pipe size that can be adopted as the second pipe - 20A (inner diameter 21 mm) to 50 A (inner diameter 48 mm) for the maximum supply flow rate of the first pipe (200 m3 / hr) , supply increase rate up to 6 times.

Example 5: First piping: Size -200A (inner diameter 200A
mm) Extension -1
00m, 3 branch pipes, 3 bends
Pressure - Inlet side: 230mmH2O
Output side: 200mmH2O
Supply amount - First pipe downstream: 560m3 /hr
Branch pipe side: For 600m3/hr Second pipe: Pipe type - Polyethylene pipe
Extension -100m
Pressure - Inlet side: 3kg
/cm2 G
Outlet side: 1kg/cm2 Allowable pressure conditions for G first piping (a) In the case of 250mmH2 O, pipe size -25A (inner diameter 2
7mm) to 75A (inner diameter 72mm) The rate of increase in supply amount is up to 4.5 times the maximum supply flow rate (800m3/hr) of the first pipe. (b) In the case of 300mmH2O, the pipe size that can be adopted as the second pipe is -50A (inner diameter 4
8mm) to 100A (inner diameter 92mm) The rate of increase in supply amount is up to 5 times the maximum supply flow rate (1200m3/hr) of the first pipe.

Example 6: First piping: Size -400A (inner diameter 400A
mm) Extension length -5
00m, 3 branch pipes, 6 bends
Pressure - Inlet side: 230mmH2O
Output side: 200mmH2O
Supply amount - First pipe downstream: 500m3 /hr
Branch pipe side: For 3000m3/hr Second pipe: Pipe type - Polyethylene pipe
Extension -500m
Pressure - Inlet side: 3kg
/cm2 G
Output side: 1kg/cm2 Allowable pressure conditions for G first piping (a) In the case of 250mmH2 O, pipe size -75A (inner diameter 7
2mm) to 150A (inner diameter 133mm) The rate of increase in supply amount is up to 6 times the maximum supply flow rate (1200m3/hr) of the first pipe. (b) In the case of 300mmH2O, the pipe size that can be adopted as the second pipe is -100A (inner diameter 92mm) to 200A (inner diameter 174mm).Increase rate of supply amount with respect to the maximum supply flow rate (1200m3/hr) of the first pipe Maximum 5.5 times.

In the above embodiment, the pressure relationship in the second pipe 2, the allowable pressure conditions allowed in the first pipe 1,
While satisfying the condition that the supply amount of the branch supply destination 5 in the first piping 1 and the supply amount of the first piping downstream supply destination 7 is not changed,
The size of the second pipe 2 is determined. Piping and supply conditions that satisfy these conditions should be calculated and determined individually, but in general, the size of the second piping 2 is
Approximately 1/5 to 1/2 of the first pipe 1 can be applied. If smaller than this size, first,
Even if the second pipes 1 and 2 are combined, no improvement in supply capacity can be expected. On the other hand, if the size is larger than this, in order to maintain the initial supply amount of the first pipe 1, it will be necessary to make the supply pressure in the first pipe 1 higher than the allowable pressure, resulting in leakage from the joint and the amount of leakage. This may cause problems such as an increase in

[Another Embodiment] Another embodiment will be described below. (a) In the above embodiments, the gas g was shown as being supplied by piping, but any gas may be used as long as it can be transported through piping. These are collectively called fluids. (B) In the above embodiment, a case was shown in which the same type of gas g (a type of fluid) was supplied through the first pipe 1 and the second pipe 2, but different types of fluid may be supplied. Therefore, the fluid supplied by the first pipe 1 is called the first fluid, and the fluid supplied by the second pipe 2 is called the second fluid. (c) In addition to the above-mentioned polyethylene tube, it is also possible to use a bellows tube or the like as the flexible tube.

[0023]Although reference numerals are written in the claims for convenience of comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

FIG. 1 is a schematic partial cross-sectional view of an embodiment in which a straight pipe is used as the second pipe.

FIG. 2 is a schematic partial cross-sectional view of an embodiment in which the first pipe has a bent portion.

[Explanation of symbols]

1 First piping 2 Second piping

Claims (4)

[Claims] Claim 1: Existing first piping (1) that supplies the first fluid to the first supply destination, and a newly installed second piping (2)
A fluid supply method for supplying a second fluid to a second supply destination by using the first pipe (1) as the second pipe (2).
), and this second pipe (2) is inserted into the first pipe (1), and between the first pipe (1) and the second pipe (2). A fluid supply method in which the second fluid is supplied through the second pipe (2) while maintaining the fluid in a state where the first fluid can be supplied. 2. The first fluid and the second fluid are the same fluid, and the second fluid has a higher pressure in the second pipe (2) than the supply pressure in the first pipe (1). The fluid supply method according to claim 1. 3. The fluid supply method according to claim 2, wherein the diameter of the second pipe (2) is set to 1/5 to 1/2 of the diameter of the first pipe (1). 4. The fluid supply method according to claim 3, wherein the second pipe (2) is composed of a flexible pipe member.