JPS6144267B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is applicable to non-destructive testing of long helical coiled heat transfer tubes for various steam generators, condensers, etc. and long helical coiled piping for chemical plants from their inner surfaces. In this case, the present invention relates to a method for smoothly and reliably inserting a non-destructive testing flaw detector into these long thin tubes.

Some types of heat exchanger tubes for steam generators, as shown in P in Figure 1, have an inner diameter of several tens of mm to several tens of mm, and a length of
It is formed of a long helical coiled tubule that extends up to 100 m, but when inspecting the inner surface of such a helical coiled long tubule 1 using a non-destructive testing method, it is necessary to , it is necessary to insert a nondestructive flaw detector (for example, an ultrasonic probe, an eddy current probe, etc.) including a cable.

The present invention was proposed for the purpose of providing an insertion method capable of smoothly and reliably inserting a non-destructive testing flaw detector into such a helical coiled long thin tube. When inserting a non-destructive testing flaw detector into a long thin tube, insert it into a pressure-resistant long flexible hose with an inner diameter equal to or slightly larger than the inner diameter of the long thin tube.
A flexible tube has a fluid-tight built-in cable with a non-destructive testing flaw detector connected to one end, and is equipped with members to be conveyed by fluid pressure at approximately equal intervals along its length. After inserting the flaw detector insertion member consisting of a connector attached to the other end of the tube, one end of the flexible hose is fluid-tightly joined to one end of the helical coiled long thin tube, and then the tube is inserted into the flexible hose. A non-destructive inspection into a helical coiled long thin tube, characterized in that the flaw detector insertion member is sent into the helical coiled long thin tube via its conveying member by blowing pressure fluid from the other end. This relates to the method of inserting the flaw detector.

Hereinafter, the present invention will be specifically explained with reference to FIGS. 2 to 9.

FIG. 2 shows a flaw detector insertion member 1 used in the present invention, which has a built-in cable (not shown) to which a non-destructive testing flaw detector 3 is connected at one end. Long flexible tube 5
are attached to the outer periphery of the flexible tube 5 at approximately equal intervals along the longitudinal direction, and when the flaw detector insertion member 1 is inserted into the flexible hose described later, the flaw detector receives fluid pressure and A member 2 for transporting the child insertion member 1 along the inside of the flexible hose is attached, and a connector 4 for connecting to a built-in cable is attached to the other end of the flexible tube 5. Third
The figure shows a long flexible hose 6 used in the present invention, which has joining flanges 6a at both ends, and whose inner diameter is equal to or slightly larger than the helical coiled long thin tube P. The flexible hose 6 has an inner diameter and is configured to have pressure resistance, and the flexible hose 6 has a fourth
As shown in the figure, the flaw detector insertion member 1 is inserted.

In FIG. 5, 7 is a pressure fluid generation device used in the present invention, and the pressure fluid discharge pipe 7a of the device 7 is
can be fluid-tightly joined to one end of the flexible hose 6 via its flange 6a.

Next, a procedure for inserting the flaw detector insertion member 1 including the flaw detector 3 for non-destructive testing into the helical coiled elongated thin tube P will be explained.

First, as shown in FIG. 4, the flaw detector insertion member 1 is inserted into the flexible hose 6. In this case, the insertion work is relatively easy if the flexible hose 6 is held in a straight line. In this case, the flaw detector 3 does not protrude from one end of the flexible hose 6, and the connector 4 does not protrude slightly from the other end of the flexible hose 6.
Furthermore, another connector 4'' having an airtight effect is attached to the connector 4.

Next, as shown in FIG. 5, at one end of the helical coiled long thin tube P, as shown in FIG. The ends of the flexible hose 6 are fluid-tightly joined via the flange 6a, and the flange 6a is connected to the other end of the flexible hose 6.
After the pressure fluid discharge piping 7a of the pressure fluid generation device 7 is fluid-tightly connected via the pressure fluid generation device 7, the pressure fluid generation device 7 is operated to send pressure fluid into the flexible hose 6 in the direction of arrow _X1 . Then, the flaw detector insertion member 1 inside the flexible hose 6 is transported as its transport member 2 receives the pressure fluid,
It is sent from inside the flexible hose 6 into the helical coiled long thin tube P. In this case, it goes without saying that the end of the helical coiled long thin tube P opposite to the attachment side of the flexible hose 6 is in an open state. Then, the helical coiled long tubule P
If we solve the connection relationship between and the flexible hose 6,
The flaw detector 3 is inserted into the helical coiled long thin tube P with the connector 4 attached with the connector 4'' slightly protruding from the long thin tube P (see Fig. 6). '' from the connector 4 and connect the connector at the end of the cable of the non-destructive testing device (not shown) to the connector 4, the flaw detector 3
A non-destructive inspection of the inner surface of the helical coiled long thin tube P can be performed using the following method. As shown in FIG. 7, the flexible hose 6 with the flaw detector insertion member 1 inserted therein as shown in FIG.
Forming it in a helical spiral shape is actually more advantageous in that it takes up less space.

As described above, the helical coiled long tubule P
In order to pull out the flaw detector insertion member 1 including the flaw detector 3 inserted therein from inside the long thin tube P, first, remove one end of the long thin tube P after removing the flexible hose 6. A winding device 8 as shown in FIG. 9 is fluid-tightly connected as shown in FIG. Connect the connector 4' at the tip of the rope 8c whose rear end is attached to When the pressure fluid generator 7 is activated to blow pressure fluid into the long thin tube P in the direction of arrow _X2 , and at the same time, the winding drum 8a of the winding device 8 is rotated in the direction of arrow _S1 at an appropriate speed. The flaw detector insertion member 1 including the flaw detector 3 is pulled out from the helical coiled long thin tube at an arbitrary speed. In this case, the pressure fluid is blown into the long thin tube P by the pressure fluid generating device 7, and the flaw detector insertion member 1 is conveyed along the long thin tube P via the conveying member 2 of the flaw detector insertion member 1. After performing the action, the pressure fluid is discharged to the outside from the side of the pressure resistant casing 8b of the winding device 8.

FIG. 9 shows an example of the winding device 8, in which the winding device 8a is arranged concentrically within the pressure resistant casing 8b so as to be rotatable by a rotating shaft 8d, and driven by a drive source (not shown). , a winding drum that is rotated in forward and reverse directions, and the winding drum 8a includes:
The rear end of a rope 8c having a connector 4' at the tip is attached, and the rope 8c is wound around a winding drum 8a via a guide member 8e attached to a pressure resistant casing 8b as shown in the figure. It's starting to come back. Although the rope 8c may be a simple rope, it is preferable to use a member consisting of a flexible tube 5 and a conveying member 2 attached to the flexible tube 5, similar to the above-mentioned flaw detector insertion member 1, as shown in the example shown in the figure. This is desirable in order to smoothly wind up the flaw detector insertion member 1 on the winding drum 8a.

In summary, the present invention provides a pressure-resistant long flexible hose having an inner diameter equal to or slightly larger than the inner diameter of the long thin tube when inserting a non-destructive testing flaw detector into the long thin tube in the form of a helical coil. A flexible tube has a fluid-tight built-in cable with a non-destructive testing flaw detector connected to one end, and is fitted with members conveyed by fluid pressure at approximately equal intervals along its length. ,
After inserting a flaw detector insertion member consisting of a connector attached to the other end of the flexible tube, one end of the flexible hose is fluid-tightly joined to one end of the helical coiled long thin tube, and then inside the flexible hose. A non-destructive method for introducing the flaw detector insertion member into the helical coiled elongated tube through the conveying member by blowing pressure fluid into the helical coiled elongated tube from the other end. Since the gist of the invention is a method for inserting a flaw detector for inspection, the present invention has the practical effect of being able to smoothly and reliably insert a flaw detector for non-destructive testing into a helical coiled long thin tube. can be mentioned.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an example of a helical coiled long thin tube, FIG. 2 is a schematic side view of an example of a flaw detector insertion member used in the present invention, and FIG. 3 is a schematic side view of an example of a flexible tube used in the present invention. A schematic side view of an example of a hose, FIGS. 4 and 5 are schematic explanatory views of the process sequence of the present invention, and FIG. 6 is a perspective view showing a state in which a flaw detector has been inserted into a flexible coiled long thin tube. 7 shows another embodiment of the present invention corresponding to FIG. 5 above. FIG. 8 is a schematic explanatory diagram of one mode in which a flaw detector is pulled out of a helical coiled long thin tube, FIG.
The figure is a schematic perspective view of an example of a winding device. P: helical coiled long thin tube, 1: flaw detector insertion member, 2: conveyance member, 3: flaw detector, 4,
4', 4'': Connector, 5: Flexible tube, 6: Flexible hose, 7: Pressure fluid generator, 8: Winding device.

Claims (1)

[Claims] 1. When inserting a non-destructive testing flaw detector into a helical coiled long thin tube, insert a non-destructive inspection probe into one end of a pressure-resistant long flexible hose with an inner diameter equal to or slightly larger than the inside diameter of the long thin tube. A flexible tube has a fluid-tight built-in cable connected to a flaw detector for destructive testing, and is equipped with members that are conveyed by fluid pressure at approximately regular intervals along the length, and other flexible tubes. After inserting the flaw detector insertion member consisting of a connector attached to the end, one end of the flexible hose is fluid-tightly joined to one end of the helical coiled long thin tube, and then pressure is applied into the flexible hose from the other end. A flaw detector for non-destructive testing into a helical coiled long thin tube, characterized in that the flaw detector insertion member is sent into the helical coiled long thin tube by blowing fluid into the helical coiled long thin tube. Insertion method.