JPS58128815A - Method of lining closed profile - Google Patents

Abstract

PURPOSE:To unite and integrate economically a liner that has resistance to corrosion, abrsion and heat, by applying an adhesive to at least one surface of the inner surface of a closed profile and the outer surface of a liner, putting them together telescopically, and applying an enlarging force to the inside of the liner to unite the liner with the closed profile. CONSTITUTION:For instance, a stainless steel thin-wall pipe 1 that will serve as the liner is placed on rotating rollers 2, 2 and is rotated thereon, and an industrial adhesive 3 such as epoxy resin adhesives, etc. is discharged from a nozzle 4 so that the circumferential surface of each end of the liner 1 is applied with the adhesive 3. Then the pipe 1 is inserted into the carbon steel outer pipe 5 having a prescribed thickness, a tapered seal cap 6 is fitted into each end of the pipe 1, a low temperature water 10 is supplied from each water introduction hole 8 by a high pressure pump with the seal caps 6 being pressed by hydroaulic jacks so that an enlarging force is applied into the inner pipe 1 to be integrated with the outer pipe 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The disclosed technology belongs to the field of liner lining technology for the inner surfaces of oil country tubular goods, corrosion-resistant containers, and the like.

This invention relates to a lining method for bonding and integrating a corrosion-resistant, abrasion-resistant, and heat-resistant liner to the inner surface of an external member having a closed cross section, such as a nuclear oil country pipe or a corrosive fluid storage container. In particular, an adhesive is applied to at least one of the inner surface of the closed cross-section member and the outer surface of the liner over the entire circumference of the seventh end, and then the two are layered relative to each other, and an expanding force is applied to the inner side of the liner. This invention relates to a method for lining a closed cross-section member in which the ends of the closed cross-section member are joined and integrated using an adhesive.

As is well known, oil country tubular goods, factory waste liquid storage containers, etc. are made up of closed cross-section members that treat corrosive fluids, and when these cross-section members are used for internal corrosive fluid treatment, they are not only corrosion resistant. , wear resistance, and even heat resistance are often required.

To deal with this, the external material of the closed section member is pressure resistant.

The general structure is to provide heat resistance and an inner liner to provide wear resistance and corrosion resistance.

For example, the liner joining technology that has been used for this purpose is clad steel metallurgy joining.

There are methods such as pipe expansion and layering, but the former has the drawback that it is extremely difficult to obtain a complete metallurgical bond between the outer material and the liner, and it has the disadvantage that it is difficult to see any economic benefits. Furthermore, the latter has the disadvantage that there is a risk of relative displacement or buckling during tube expansion.

Corrosion-resistant plastic lining may also be considered, but it is inconvenient in terms of cost for mass production, long length, and large size.

The purpose of this invention is to solve the above-mentioned problem of liner lining for closed cross-section members such as double pipes and corrosion-resistant containers, and to apply an industrial adhesive only to the overlapping parts at the ends of the two in advance to overlap and expand the joint. It is more integrated, requires less expensive adhesives, and has the liner wall thickness as thin as possible, making it economically viable, easy to expand, and has an excellent closed cross section that does not cause leaks. It is an object of the present invention to provide a method for lining a member.

The structure of the present invention that meets the above-mentioned object is to apply an industrial adhesive to the entire circumference of one or both ends of the inner surface of the closed cross-section member and the outer surface of the liner, and to bond the two relative to each other. The liner is laminated and a radial expansion force is applied to the liner to yield it, so that the liner is tightly and integrally joined to the closed cross-section member, and at this time, the end portion is firmly joined with the adhesive material and sealed. The gist of the system is to prevent corrosive fluid from leaking from the end even if the liner is damaged in the general area during operation.

Next, one embodiment of the present invention will be described below with reference to the drawings.

The embodiment shows a corrosion-resistant double pipe device for oil country tubular goods, and as shown in Fig. 1, a stainless steel thin-walled inner pipe 1 serving as a liner is placed on rotating rollers 2, 2 and rotated to coat the epoxy resin. Industrial adhesive 2 For example.

An adhesive 3 such as thiocol is discharged from a nozzle 4.

Coat the end of the liner 1 all around the circumference and for a predetermined length in the axial direction.

Then, the inner tube 1 coated with adhesive 3 on both ends and around the entire circumference is inserted and layered on the carbon steel outer tube 5 having a set wall thickness as shown in FIG. 2, and then the inner tube 1 is layered as shown in FIG. A tapered seal cap 6 is fitted onto the end of the pipe 1, and a suppression clamp rod 7 of a hydraulic jack (not shown) is used to press the seal cap 6 at a set pressure to open the water guide hole 8 provided in the seal cap 7. The pulp 9 connected to one end is opened, the other end is closed, low-temperature tap water 10 is supplied by a high-pressure pump (not shown), and a pipe expansion force is applied to the inner pipe 1, and the inner pipe 1 is joined integrally with the outer pipe 5, and both pipes are expanded together and stress is applied. After the pipe is expanded to a set diameter along the strain curve and yielded, the pipe is drained and contracted, and the seal cap 6.6 is removed.

As the layered double tube 11 obtained in this manner rises to room temperature, the fitting force of the inner tube 1 increases, compressive residual stress is also formed in the axial direction, and the adhesive 3 is removed at the tube end. In order to fix the inner and outer tubes 1 and 5, the formation of compressive residual stress in the inner tube 1 is assisted.

Therefore, when the double pipe 11 is put into operation.

Even if cracks unexpectedly occur in the general area.

Fluid leakage is confined between the adhesives 3 and 3 at the ends of the unit tubes and does not reach the joint.

It goes without saying that the embodiments of the present invention are not limited to the above-mentioned embodiments. For example, the adhesive may be applied to the inner surface of the outer tube, or the adhesive may be applied to the surfaces that correspond to both the inner and outer tubes. Further, various embodiments can be adopted, such as interposing an adhesive by press-fitting from the gap between the ends of both tubes after relatively overlapping the inner and outer tubes, or heating the outer tube during tube expansion.

Of course, the target closed cross-section member is not limited to the pipe material, but also includes a storage container and the like.

As mentioned above, according to the present invention, a corrosive fluid transport pipe,
In the liner lining method for corrosion-resistant, heat-resistant, and abrasion-resistant closed-section members such as containers, an adhesive is applied to the entire circumference of at least one end of the joint surface between the outer member and the liner. By layering both parts relative to each other and expanding the liner to integrate them, both parts are not only integrally joined, but there is no need to apply adhesive to the entire surface of the joint, which eliminates the need for expensive industrial adhesives. Excellent results can be achieved using only a small amount of material.

In addition, since there is no risk of buckling, a thin liner can be used, and therefore, it is not necessary to use a large amount of expensive corrosion-resistant materials, which has the effect of saving materials, reducing weight, and reducing costs.

In addition, since the liner is thin and lightweight, it is easy to perform operations such as stacking and expanding the pipe, and has the effect of improving product precision.

Therefore, even if a defect occurs unexpectedly in the liner of the product, there is no risk of fluid leakage because the outer material and the liner are integrated with the adhesive applied around the entire edge.

[Brief explanation of the drawing]

The drawings are explanatory diagrams of one embodiment of the present invention, and Fig. 1 is an explanatory diagram of the process of applying adhesive to the end of the inner pipe, Fig. 2 is an explanatory diagram of the process of relative layering of the inner and outer pipes, and Fig. 3 is an explanatory diagram of the process of expanding the pipe. , FIG. 4 is an enlarged cross-sectional view of the tube end. 5... Closed section member, 1... Liner, 3...
... Adhesive Applicant Kawasaki Heavy Industries Co., Ltd.

Claims (1)

[Claims] In a method of integrally bonding and lining a liner to a closed cross-section member, the closed cross-section member is coated with adhesive over the entire circumference of at least one end of the inner surface of the closed cross-section member and the outer surface of the liner. A method for lining a closed cross-section member, characterized in that the liner and the liner are layered relative to each other, and an expanding force is applied to the inside of the liner to integrate and connect the two.