JPH01172690A - Installation of double piping in pipeline fluid transportation - Google Patents

Abstract

PURPOSE:To enable different kinds of fluid being transported through a single pipe by installing a double piping in such a way that a guide member is mounted on the external periphery of an inner pipe having a specified length and used as an inner insertion pipe and the inner pipe is inserted into an external pipe with an insertion means. CONSTITUTION:Of the inner pipes 1 which are to be inserted into an external pipe, the desired number of inner pipes longer than the others are prepared. Sleeves 3 as guide means are mounted at the specified interval on the external periphery 1a of the inner pipes 1. In addition, an inner pipe 1 is inserted into the external pipe 2 using a pull wire 7, that is, an insertion means. Subsequently a next pipe 1 to be inserted into the external pipe 2 is connected to the previously inserted pipe 1 and such pipe insertion action into the external pipe is made repeatedly using a pull wire 7, that is, an insertion means. As a result, different kinds of fluid may be transported using a single pipe line and the pulsation and vibration generated due to the operation of the pipe line is damped so that the protection for the internal wall of the external pipe and the internal wall can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of constructing a pipeline fluid transport 21r pipe.

[Conventional technology]

Conventionally, in order to transport two types of fluids in this type of pipeline, it was necessary to construct and install two separate pipelines.

[Problem that the invention seeks to solve]

However, in conventional equipment, in order to transport two types of fluids by pipeline, two separate pipelines must be laid, so this construction requires the installation of two pipelines. 'i? However, since it requires the cost of materials for two pipelines and the pipeline is long, there is a problem in that the cost becomes extremely high.

(tJ-like) This invention was made to solve these problems, and involves providing an inner pipe in one pipeline and transporting two different types of fluids to the outer pipe and the inner pipe. The purpose of the present invention is to propose a construction method for pipeline fluid transportation knee pipes that requires only the installation cost of one pipe and the material costs of two pipes, is easy to work with, is low in cost, and can damp pulsation and vibration. It is said that

[Means for solving problems]

For this reason, the construction method of the pipeline fluid transport double piping according to the present invention is to store a guiding means around the outer circumference of an inner pipe of a predetermined length inside an outer pipe, and insert this inner pipe into the outer pipe by an insertion means. By constructing double piping, it is possible to transport different types of fluids using a single pipeline, thereby achieving the above-mentioned objective.

(Function) In the construction method of the pipeline fluid transport double pipe of the present invention, by inserting a longer inner pipe into the outer pipe using an insertion means to create a double pipe, two types of pipes can be constructed with one wooden pipeline. It can transport fluids, is easy to manufacture, and has a guide member attached to the outer periphery of the inner tube inserted into the outer tube, making it easier to insert the inner tube and reducing pulsations and vibrations that occur due to pipeline operation. Attenuates and helps protect the inner wall of the outer tube and the inner tube.

〔Example〕

A construction method for a pipeline fluid transport double pipe according to an embodiment of the present invention will be explained below with reference to the drawings.

Figures 1 to 4 are explanatory diagrams of one embodiment of the present invention, in which Figure 1 is an overall schematic diagram, Figure 2 is an explanatory diagram of the construction method,
Figure 3 is a sectional view showing the existing outer tube, Figure 4 is a sectional view showing the inner tube with a sleeve attached to it inserted into the outer tube, and Figure 5 is the inner tube with the sleeve attached. FIG.

The double piping construction method according to this embodiment is an example in which an inner pipe is inserted into an existing pipe, and before constructing a double pipe by inserting an inner pipe 1 into an existing outer pipe 2, The inner tube 1 is shaped according to the shape of the outer tube 2 into which the inner tube 1 is inserted, and the length is made to correspond to the desired number of tubes required for the double piping.

In order to insert the inner tube 1 into the existing outer tube 2, in order to prevent friction between the inner wall 2a of the existing outer tube 2 and the outer wall 1b of the inner tube 1 when the inner tube is pulled in, By installing sleeves 3, which serve as guide means, at predetermined intervals, after this installation is completed, a structure is created that absorbs pulsations, vibrations, etc. during pipeline operation, and helps protect the existing outer pipe 2 and inner pipe 1. It becomes.

Depending on the outer diameter of the inner tube 1, the sleeve 3 is attached to the outer circumference of the inner tube by making a slit or dividing it into two or more parts. In 9, it is possible to take A/J with appropriate spacing and inclination.

In the case of an existing outer pipe, the diameter of the inner pipe to be inserted into the existing outer pipe, whether installed on the seabed, underground, or underground, is appropriately selected depending on the purpose of use.

The applicable pipe dimensions are, for example, 1 pipe - 178B (6A) specified in industry standards (JIS).
80B (2000A), and 1/8B to 80B defined in the ANS I standard. - As an example, 24B
When a 10B (250A) inner pipe is installed within an existing outer pipe (600A), the change in flow rate due to changes in the cross-sectional area of the existing outer pipe is considered to have virtually no effect in practical terms.

As the material for the pipe used in the double piping, depending on the type of fluid and design conditions, metal pipes such as steel pipes, stainless steel pipes, steel pipes, and lead pipes, and pipes made of nonmetallic materials such as polyethylene pipes can be used.

In order to lay the inner pipe 1, a flange 6 is provided in advance at the insertion part 4 for inserting the inner pipe 1 into the existing outer pipe 2 and at the exit port 5 for taking it out, and the work after inserting the inner pipe 1 is carried out. Make it easy.

Next, the wire 7 for pulling the inner tube 1, which is the insertion means, is sent from the insertion port 4 to the salt outlet 5. The end of this wire 7 is connected to the tip of the inner tube 1, and the wire 7 is connected to a winch (not shown). Gradually roll it up.

Before this, as mentioned above, for example, insert "Part 1 4".
In the plane of , the inner tube 1 is connected to the required length and the sleeve 3 is attached to the outer circumference 1a of the inner tube 1 before insertion.

Next, the inner tube 1 with this sleeve 3 attached is connected to the inner tube previously inserted into the outer tube 2 with the wire 7, and then inserted into the outer tube 2 with the wire 7, and this inner tube 1 is inserted into the outer tube 2 with the wire 7. The operation of inserting the inner tube into the outer tube 2 is continued until the inner tube is completely drawn into the existing outer tube 2. After the installation is completed, a pressure test is conducted on the existing outer pipe 2 and inner pipe 1 to confirm that there are no leaks.

According to an embodiment of the present invention, seven flange 6 are provided in advance in the outer tube 2 at the insertion port 4 for inserting into the inner tube l and the extraction port 5 for taking out the tube, and the insertion port 4 is inserted into the outer tube 2 from the insertion port 4. The inner tube 1 is connected to a predetermined length, and the inner tube 1 is connected to the outer tube 2.
Attach the sleeve 3 to the outer circumference 1a before inserting it into the
Insert the inner tube 1 with this sleeve 3 attached into the outer tube 2 using the wire 7 up to the insertion opening 4 of the outer tube 2.
After connecting the tip of the next inner tube to be inserted into the inner tube 1 to the rear end of the inner tube 1, the operation of inserting it into the outer tube 2 with the wire 7 is repeated, and after completing this operation, the outer tube 2 and the inner tube 1 are connected to the rear end of the inner tube 1. By conducting a pressure test and confirming that there is no leakage at 4T, the inner pipe is inserted into one pipeline, and two different types of fluids are inserted into the inner pipe and the gap between the inner pipe and the outer pipe. Since it is possible to transport either one of these fluids, the installation cost for one pipeline and the material cost for two pipelines are reduced, the space is small, the work is easy, the cost is low, and it is easy to operate the pipeline. It has the effect of damping the pulsations and vibrations that occur.

(Other Embodiments) In an embodiment of the present invention, a method for constructing a pipeline fluid transport double pipe in which an inner pipe is inserted into an outer pipe using an inner pipe insertion means has been described. As in the other embodiments shown in FIGS. 9 to 9, when manufacturing the pipes, the straight pipe section 8 and the curved pipe section 9 are respectively connected to the outer pipe 2. The inner tubes 1 are manufactured separately, and the inner tubes 1 are inserted into each of the outer tubes 2. When installing on-site, in order to connect the inner tubes 1 first, for example, connect the end 1c of the inner tubes 1. It is convenient for work if you make it a little longer and take it to the job site. In addition, by attaching the sleeve 3 to the outer periphery 1a of the inner tube, the work of inserting the inner tube is facilitated, pulsations and vibrations that occur during operation are absorbed, and the inner wall 2a of the outer tube 2 and the inner tube 1 are protected. The same effect as in the previous embodiment is provided.

As described above, the construction method of the pipeline fluid transport double piping according to the present invention includes cases where the outer pipe is an existing or newly installed pipe, etc.
Also, there are various forms depending on the situation at the site.

(Effects of the Invention) As described above, according to the present invention, by inserting a longer inner pipe into the outer pipe using the insertion means to create double piping, different types of pipeline can be used. It can transport different fluids, is easy to manufacture, takes up little space, and has a guide member attached to the outer periphery of the inner tube to be inserted into the outer tube, making the work of inserting the inner tube easier and making it easier to operate the pipeline. The present invention has the effect of providing a construction method for pipeline fluid transport double piping, which is useful for attenuating the movement and vibrations caused by piping and protecting the inner wall of the outer pipe.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a construction method for a pipeline fluid transport double pipe according to an embodiment of the present invention, FIG. 1 is an overall schematic diagram of the same, FIG. 2 is an explanatory diagram of the construction method, and The figure is a cross-sectional view showing the existing outer tube, Figure 4 is a cross-sectional view showing the inner tube with a sleeve attached to it inserted into the outer tube, and Figure 5 is a cross-sectional view showing the inner tube with the sleeve attached. The perspective view and FIGS. 6 to 9 are explanatory views of other embodiments, FIG. 6 is an explanatory view of the same construction method, FIG. 7 is a front view showing the inner pipe of the straight pipe section, and FIG. 9 and 9 are front views showing the inner tube of the curved tube portion, respectively. In the figure, 1...Inner tube 1a...Outer periphery 2...Outer tube 3...Sleeve 6...Flange 7...Wire In addition, the same reference numerals indicate the same or equivalent parts throughout the country.

Claims (3)

[Claims] (1) Before inserting the inner tube into the outer tube to form a double piping, make the desired number of inner tubes longer to match the shape of the outer tube to be inserted, Depending on the shape of this longer inner tube, a guide means is attached to the outer periphery, the inner tube with the guide means attached is inserted into the outer tube by the insertion means, and then the next inner tube to be inserted into the outer tube is A double pipeline fluid transport system characterized in that after connecting to the inner pipe, the insertion operation is repeated into the outer pipe using an insertion means, and after the work is completed, the presence or absence of leakage is confirmed by a pressure test of the outer pipe and the inner pipe. Piping construction method. (2) A construction method for a pipeline fluid transport double piping according to claim 1, characterized in that flanges are provided at both ends of the outer pipe. (3) When inserting the inner tube with the guide means attached into the outer tube by the insertion means, add another outer tube to this outer tube if necessary, and insert the inner tube with the guide means inside the added outer tube. A method for constructing a pipeline fluid transport double piping according to claim 1, characterized in that the double piping for pipeline fluid transport is inserted by an insertion means.