JP2521080B2 - Underwater organism adhesion preventive device for pipe inner surface - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is arranged in important points such as the inner surface of a connecting portion and the inner surface of a T-shaped portion of a pipeline, such as a seawater transport pipeline, to which aquatic organisms adhere. The present invention relates to a device for preventing aquatic organisms from adhering to a pipe inner surface for preventing adhesion of aquatic organisms at that site.

[Problems to be Solved by Prior Art and Invention]

In seawater transportation pipelines, etc.
Aquatic organisms such as mussels may attach to them, obstructing transport, or detaching them, which may interfere with downstream equipment.
In order to prevent such organisms from adhering, it is necessary to take measures such as ensuring a high flow velocity according to the pipe inner surface specifications. However, since organisms often adhere to the site where the flow velocity changes locally such as the flange connection part and the T-shaped part, it is necessary to remove them periodically or to apply antifouling paint to the site. Taken. Here, although the effect of preventing biofouling by the latter is remarkable, it is necessary to repaint every 2-3 years to renew the function. In addition, since polyethylene lining pipes, which are widely used because of their excellent durability and low biofouling limit flow velocity, have low paint adhesion, they require complicated treatment such as pretreatment on the target surface during painting. Was needed.

In view of such a situation, the present inventors have conducted various studies on biofouling prevention means that can be easily applied to important points in pipelines with various inner surface specifications and have a long effect period, and as a result, have achieved the present invention. It is a thing.

[Means for solving problems]

The present invention is composed of a copper-based metal body, and can form a ring by being brought into contact with an important point on the inner surface of the pipe, at least on the circumference.
It has a ring-shaped main body with separated parts and an interconnecting mechanism for interconnecting mutually facing circumferential end portions of the ring-shaped main body, and at least one of the interconnecting mechanisms has a ring diameter adjusting function. The feature of this invention is the aquatic organism attachment preventive device for the inner surface of the pipeline.

[Action]

According to the aquatic organism adhesion preventing device for an inner surface of a pipe having the above structure, the ring-shaped body is inserted into a portion of the inner surface of the pipe where aquatic organisms are likely to adhere, and then the circumferentially separated circumferential end. The part is an interconnecting mechanism with a ring diameter adjustment function,
By connecting while enlarging the ring diameter, the outer peripheral surface of the ring-shaped main body can be pressed against the inner surface of the pipe and easily fixed. Since this ring-shaped body is made of copper-based metal, it is possible to prevent the attachment of aquatic organisms.

The term “pipe” as used in the present invention means a metal pipe whose inner surface is coated with polyethylene or epoxy resin-based paint, mortar, or the like, or a fume pipe, a bare metal pipe, etc., such as a flange, a victor joint, a plug joint, or welding. It has a conduit for mainly transporting seawater, which is connected by the above and the welded part is repaired and coated as necessary. In addition, the important point in the pipeline is a site where aquatic organisms usually attach easily. For example, the inside of a connection part such as a flange, the inside of a weld bead, or a T-shaped part adjacent to these connection parts, L For example, the character part.

The material forming the ring-shaped body of the present invention is a copper-based metal, and specifically, pure copper or cupronickel can be exemplified. When applying such a copper-based metal ring-shaped main body to the bare metal surface of the inner surface of the pipeline, make sure that the copper-based metal used for the ring-shaped main body prevents battery corrosion from occurring between the ring-shaped main body and the pipe. It is good to insulate with a resin film or cloth sandwiched between them.

Like flange connections or weld beads in pipelines,
It is preferable that the ring-shaped main body used for the portion having the recess or the protrusion on the inner surface of the conduit is provided with the protrusion or the recess on the outer peripheral surface thereof. Such protrusions or depressions fit into the depressions or protrusions on the inner surface of the conduit to act as stoppers that prevent movement of the ring-shaped body.

Hereinafter, the present invention will be described in more detail with reference to the embodiments shown in the drawings.

〔Example〕

FIG. 1 is a cross-sectional view showing an example in which the underwater organism adhesion preventing device for an inner surface of a pipeline according to an embodiment of the present invention is applied to a flange connection portion of the pipeline, 1 is a tubular body constituting the pipeline, 2 Is a flange for connecting the tube body, 3 is a resin coating provided on the inner surface of the tube body 1 and the end surface of the flange 2, and 4 is a packing interposed between the flanges.

Reference numeral 5 denotes an aquatic organism attachment preventive tool attached to the inner surface of the flange connection portion of the pipeline, which has a ring-shaped main body 6 made of a copper-based metal body and a connecting plate 7. The ring-shaped body 6 is the second
As shown in the figure, the whole is in the shape of a ring, and one groove on the circumference is cut off to form a groove 8. The ring-shaped main body 6 is inserted into the pipe body 1 to By expanding the outer diameter of the ring-shaped main body 6 by widening the interval, it is possible to press the outer peripheral surface of the ring-shaped main body 6 against the inner surface of the pipe to mount it.
As shown in FIG. 3, the circumferential ends 6A, 6A of the ring-shaped body
Has a tapered shape, and the connecting plate 7 is inserted between the tapered circumferential end portions 6A, 6A, and is attached to the wedge portion 7A that spreads the end portions 6A, 6A and the inner surface of the ring-shaped body 6. And a flange portion 7B for. Therefore, by pushing the rib portion 7A between the circumferential end portions 6A, 6A and fixing the flange portion 7B to the ring-shaped main body 6 with the screw 9, the outer diameter of the ring-shaped main body 6 is enlarged and the outer peripheral surface is covered with a pipe. It can be pressed and fixed to the inner surface of the body 1. The connecting plate 7 constitutes an interconnecting mechanism for interconnecting the circumferential ends, which has a function of adjusting the outer diameter of the ring-shaped body. In addition, the circumferential end
6A, 6A and the wedge portion 7A are not only tapered in the radial direction of the pipe as shown in FIG. By moving the ring-shaped main body 6 in the longitudinal direction, the outer diameter of the ring-shaped main body 6 can be further increased, which is preferable.

The interconnecting mechanism for interconnecting the circumferential ends of the ring-shaped body 6 is not limited to the connecting plate 7 shown in FIG. 3, but various modifications are possible. FIG. 4 and FIG. 5 show an example thereof, in which the cut-and-raised parts 10 are formed in the vicinity of the respective end portions of the ring-shaped main body 6 facing each other in the circumferential direction, and between the cut-and-raised parts 10 and the ring-shaped main body 6. The plate wedge 11 is engaged. By pushing this plate-shaped wedge 11 in the direction of the arrow in FIG. 5, the ring-shaped body 6 is deformed in the direction of the arrow in FIG. 4, the ring diameter is enlarged, and the outer peripheral surface is pressed against the inner surface of the pipe. You can FIG. 6 shows another example,
The end portion of the ring-shaped main body 6 is processed into a step shape, superposed on each other, and fixed by a flat head screw 12. Here, the hole through which the flat head screw 12 passes is an elongated hole, which allows the ring diameter adjusting function to be fulfilled. FIG. 7 shows still another example, in which a flange 13 is provided near the end of the ring-shaped body 6.
The flanges 13 and 13 are connected by a turnbuckle 14 to adjust the ring diameter. Of course, it is also possible to use screwing and a turnbuckle together.
The interconnecting mechanism for connecting the ends of the ring-shaped body 6 minimizes unevenness in the state where the ring-shaped body is arranged in the conduit so as to reduce new disturbance in the flow in the conduit. Is good. Further, it is desirable to use the same metal as that of the ring-shaped body as the material of the parts used for the end connection mechanism.

In FIG. 2, a continuous protrusion 6B extending in the circumferential direction is formed on the outer peripheral surface of the ring-shaped body 6. The protrusion 6B is provided so as to be fitted into the recess of the inner surface of the flange connection portion, and the protrusion 6B of the ring-shaped body 6 is fitted into the recess of the inner surface of the conduit to attach the ring-shaped body 6 The movement of the ring-shaped body 6 in the tube axis direction can be effectively prevented. That is, the protrusion 6B acts as a stopper that prevents the ring-shaped body 6 from moving.

As shown in FIG. 2, the protrusion provided on the outer peripheral surface of the ring-shaped body 6 is not limited to being continuous in the circumferential direction, but may be intermittent. These protrusions can be formed integrally with the ring-shaped body by pressing the ring-shaped body, roll forming, or shaving from the raw material metal. Further, as shown in FIG. 8, a part 6C of the ring-shaped main body 6 may be cut and raised and used as a projection. Further, the protrusion may be formed by erecting a bolt or a rivet on the ring-shaped body 6 or by welding the outer peripheral surface of the ring-shaped body. In this case, consideration should be given to avoiding attachment materials and welding materials made of dissimilar metals so that battery corrosion does not occur. In addition,
As described above, when the projection is integrally formed with the ring-shaped body by pressing, roll forming, shaving, etc., the above consideration is not necessary and the bending to the pipe diameter is performed uniformly. obtain. In addition, the bending method is a cold method,
Any of the hot methods may be used. It is economical to perform bending and projection forming at the same time using a grooved roll.

In FIG. 1, since the ring-shaped main body 6 is attached to the inner surface of the pipe, it is desirable to minimize the occurrence of turbulence in the flow inside the pipe. Therefore, in the illustrated embodiment, the cross-section is flat and both peripheral edges are formed. 6D is gently formed.
The cross-sectional shape can be variously changed, and for example, as shown in FIG. 9, the inner surface may have a gentle arc shape. In the case where the flat plate shown in FIG. 1 or the inner surface shown in FIG. 9 has an arcuate shape, the preferable thickness of the ring-shaped body 6 varies depending on the metal composition, the pipe diameter, the length of the target portion, etc. For example, pure copper provides moderate rigidity in the range of 1 to 5 mm, and there is little risk of corrosion disappearance. The width of the ring-shaped body 6 varies depending on the object, but in the case of the flange portion, the range of 3 to 300 mm is suitable.

Fig. 10, Fig. 11 and Fig. 12 show the ring-shaped body 6 respectively.
FIG. 10 shows still another cross-sectional example of the ring-shaped main body 6 of FIG. 10 having a projection 6B which fits into a recess on the inner surface of the flange connection portion.
The left and right lengths of which are different, Fig. 11 shows the projection 6B formed on one end of the ring-shaped body 6, and Fig. 12 shows the ring-shaped body consisting of only the part that fits into the recess of the flange connection part. It is 6. In the case of the ring-shaped main body 6 shown in FIG. 12, rod-shaped, tubular, groove-shaped or wedge-shaped or trapezoidal cross-section can be used.

The ring-shaped main body 6 shown in FIG. 2 has an integrated structure in which only one place on the circumference is cut away, but instead of this,
The ring-shaped body 6 may be divided into a plurality of segments and the plurality of segments may be connected to form a ring. In this case, any connecting means can be used to connect the segments. For example, as shown in FIGS. 13 and 14, the pin insertion portion 16 is provided at the end of each segment 6a, 6b.
Can be formed, and the pin insertion portion 16 can be connected by a pin (not shown).

FIG. 15 shows another embodiment of the present invention, showing an aquatic organism attachment preventive tool 4a attached to the T-shaped portion of the conduit. In the figure, reference numeral 20 denotes a weld bead portion for connecting the pipe body 1. Because of this bead portion 20, the pipe body 1 has a protrusion on its inner surface. The aquatic organism attachment preventing device 4a has a ring-shaped main body 6c having the same shape as the ring-shaped main body shown in FIG. 2 and a connecting plate 7a having the same shape as the connecting plate 7 shown in FIG. 7a spreads the diameter of the ring-shaped main body 6c and presses the outer peripheral surface against the inner surface of the tube to fix it in the position shown. Unlike the embodiment shown in FIG. 2, the outer peripheral surface of the ring-shaped body 6c is formed with a recess 6E that fits into the bead portion 20. By fitting the recess 6E and the projection (bead portion 20) on the inner surface of the tubular body, the ring-shaped main body 6c does not move in the tubular body to prevent biological attachment.

In each of the above embodiments, the ring-shaped main body is fitted with the projection 6B or the recess 6E provided on the outer peripheral surface thereof and the recess or the projection on the inner surface of the tube to prevent the movement of the ring-shaped main body. It is also possible to omit the protrusions or depressions on the outer peripheral surface of the ring-shaped main body and fix the ring-shaped main body only by frictional contact between the outer peripheral surface of the ring-shaped main body and the surface of the fitting body. Further, in this case, in order to secure the fixing of the ring-shaped main body, an arc-shaped plate material may be joined to at least the downstream inner surface of the ring-shaped main body to act as a stopper. Further, in the above-mentioned embodiment, only the case where the underwater organism adhesion preventive tool is installed in the existing pipeline has been described. However, this underwater organism adhesion preventive tool is attached to the flange joint portion or the victoric pipe joint portion at the time of pipe connection work. It goes without saying that it may be installed in the pipeline by such means. In this case, the protrusion of the ring-shaped body can be made longer and sandwiched between the flanges.

Hereinafter, the experimental results using the aquatic organism adhesion preventing device of the present invention will be described.

[Example I]

A pure copper aquatic organism adhesion preventive device with a structure as shown in Fig. 1 was attached to the flange connection part of the seawater transportation pipeline to which a flanged inner polyethylene lining steel pipe with a nominal diameter of 1000 A was connected. However, the ring-shaped body of the device for preventing attachment of aquatic organisms used in this experiment, unlike the structure shown in FIG. 1, is a two-part type and is made by cutting out integrally (without forming grooves on the inner surface). It is flat). The plate thickness of the ring-shaped body is 3 mm, the width is 200 mm, and the protrusions on the outer peripheral surface have a base width of 5 mm.
It is a continuous projection with a mountain-shaped cross section with a height of 5 mm.

As a result of observing the state of biofouling during 12 months from September 1985 to September of the following year by flowing seawater at a flow rate of about 3.5 m / sec into this pipeline, the underwater biofouling preventive device according to the present invention was attached. No organisms adhered to the other two places, whereas mussels and barnacles were densely present in the recesses of the untreated joints.

Example II

A pure copper aquatic organism adhesion preventive device having the structure shown in Fig. 15 was attached to the T-shaped portion of the above-mentioned pipe where 1000A to 600A was transferred. As a result of water flow observation, as in Example I, the effect of the aquatic organism adhesion preventing device of the present invention was remarkably observed.

〔The invention's effect〕

As described in detail above, the aquatic organism adhesion preventive device for an inner surface of a pipe of the present invention can be easily installed in a pipe such as a seawater transport pipe to which aquatic organisms tend to adhere, thereby facilitating the attachment of organisms. In addition, it can be prevented for a long period of time, and can be easily removed and replaced, making a great contribution to the operation and maintenance of such transportation pipes.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a flange connection part to which an aquatic organism attachment preventing device for pipe inner surface according to an embodiment of the present invention is attached, FIG.
The figure is a perspective view of a ring-shaped body used in the embodiment, the third.
The figure is a side view showing the interconnecting mechanism at the circumferential ends of the ring-shaped body, Fig. 4 is a side view showing a modification of the interconnecting mechanism at the circumferential ends of the ring-shaped body, and Fig. 5 is its bottom surface. 6 and 6 are cross-sectional views showing another modification of the interconnecting mechanism at the circumferential ends of the ring-shaped body, and FIG. 7 is yet another modification of the interconnecting mechanism at the circumferential ends of the ring-shaped body. Side view showing the eighth
Fig. 9 and Fig. 9 are cross-sectional views showing modifications of the cross section of the ring-shaped body, and Figs. 10, 11 and 12 show modification examples of the cross-section of the ring-shaped body attached to the flange connection part. A cross-sectional view, FIG. 13 is a plan view showing an example of a portion connecting the respective segments when the ring-shaped main body is composed of a plurality of segments,
FIG. 14 is a side view thereof, and FIG. 15 is a cross-sectional view showing a T-shaped portion to which an aquatic organism adhesion preventing device for a pipe inner surface according to another embodiment of the present invention is attached. 1 ... Tube, 2 ... Flange, 3 ... Resin coating, 4 ...
Packing, 5 ... Underwater adherence prevention tool for pipe inner surface, 6 ...
… Ring-shaped body, 6A… Circumferential end, 6B… Protrusion, 6E…
… Dents, 7 …… Connecting plate, 7A …… Wedge, 10 …… Cut and raise, 11 …… Plate wedge, 12 …… Flat head screw, 13 …… Flange, 14 …… Turn buckle

Claims (4)

(57) [Claims] 1. A ring-shaped member which is made of a copper-based metal body and which can be brought into contact with a point on an inner surface of a pipe to form a ring.
It has a ring-shaped main body with separated parts and an interconnecting mechanism for interconnecting mutually facing circumferential ends of the ring-shaped main body, and at least one of the interconnecting mechanisms has a ring diameter adjusting function. An underwater organism adhesion prevention tool for the inner surface of pipes, which is characterized by 2. The water for pipe inner surface according to claim 1, wherein the ring-shaped main body has a protrusion or a recess on its outer peripheral surface that engages with a recess or protrusion on the inner surface of the pipe. Means for preventing adherence of small organisms. 3. The interconnecting mechanism having the ring diameter adjusting function has a wedge that pushes out mutually facing circumferential end portions of the ring-shaped body. An aquatic organism adhesion preventing device for the inner surface of the pipeline according to the item. 4. The interconnecting mechanism having the ring diameter adjusting function has a turnbuckle for adjusting the interval between the circumferential end portions of the ring-shaped main body facing each other. Alternatively, the aquatic organism attachment preventing device for the inner surface of the pipeline according to the second aspect.