JP2006258610A - Apparatus and method for inspecting thickness reduction of laid pipe with heat insulating member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for inspecting a thickness reduction of a laid pipe with a heat insulating member, which can effectively measure a thickness for the minimum working hours without removing the heat insulating member. <P>SOLUTION: The apparatus for inspecting the thickness reduction of the laid pipe with the heat insulating member being composed of a metal cover 1, the heat insulating member 2 and a pipe 3 arranged in the above order from the outside comprises; a sheath tube 4 which passes through the metal cover and the heat insulating member and contacts with the surface of the pipe; an ultrasonic probe 5 which is disposed inside the sheath tube and contacts with the surface of the pipe through a water-enclosed rubber membrane 7; and a probe device 8 which calculates the thickness of the pipe based on waves transmitted/received by the ultrasonic probe. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a thinning inspection apparatus and method for measuring a thinning thickness of a pipe by installing an ultrasonic probe, and more particularly to a thinning inspection apparatus and a method for a pipe with a heat insulating material.

Among the pipes used in various plants in the industry, there are some pipes whose outside is covered with a heat insulating material in order to convey a high temperature or low temperature liquid or gas. When trying to check deterioration of piping such as periodic inspection, in these pipes with a heat insulating material, the heat insulating material was completely removed, and then an appearance inspection, for example, an ultrasonic probe disclosed in Patent Document 1 was used. Pipe thickness measurement has been performed.
JP 2000-88824 A

  However, the conventional method of removing the heat insulating material first before the inspection has a problem that the inspection requires more cost and time than the case without the heat insulating material because the heat insulating material needs to be restored after the inspection. For this reason, it has been anxious that pipes with a heat insulating material have a low inspection implementation rate, and that serious damage such as corrosion thinning is often overlooked.

  The present invention has been made in view of the above circumstances, and provides a thinning inspection apparatus and method for a pipe with a heat insulating material capable of efficiently measuring a wall thickness in a minimum work time without completely removing the heat insulating material. The purpose is to do.

  The invention according to claim 1 of the present invention is a thinning inspection apparatus for a pipe with a heat insulating material configured in the order of a metal cover, a heat insulating material, and a pipe from the outside, and the pipe penetrates the metal cover and the heat insulating material. A sheath tube in contact with the surface, an ultrasonic probe disposed inside the sheath tube and in contact with the pipe surface through a water-filled rubber film, and transmission / reception waves of the ultrasonic probe And a probe for calculating the pipe wall thickness.

  The invention according to claim 2 of the present invention is a thinning inspection apparatus for a pipe with a heat insulating material configured in the order of a metal cover, a heat insulating material, and a pipe from the outside, and penetrates the metal cover and the heat insulating material, A sheath tube having a double-pipe structure in contact with the pipe surface, an ultrasonic probe disposed in the inner pipe of the sheath pipe and in contact with the pipe surface through a water-filled rubber film, A probe for calculating the pipe thickness from the transmission / reception wave of the ultrasonic probe, and supplying the medium liquid to the ultrasonic probe from the inner tube, the outer tube, and the gap of the sheath tube, and It is a thinning inspection device for a pipe with a heat insulating material, characterized in that a pipe wall thickness is calculated by a touch device.

  Moreover, the invention which concerns on Claim 3 of this invention is a thinning inspection method of the pipe | tube with a heat insulating material comprised in order of the metal cover, the heat insulating material, and piping from the outer side, Comprising: The said metal cover and a heat insulating material are penetrated. After opening the hole, the sheath tube is penetrated and brought into contact with the pipe surface, and an ultrasonic probe is arranged inside the sheath pipe so as to be brought into contact with the pipe surface via a water-filled rubber film, A thinning inspection method for a pipe with a heat insulating material, characterized in that a pipe wall thickness is calculated by a probe based on a transmission / reception wave of the ultrasonic probe.

  Furthermore, the invention which concerns on Claim 4 of this invention is a thinning inspection method of the pipe | tube with a heat insulating material comprised in order of the metal cover, the heat insulating material, and piping from the outer side, Comprising: The said metal cover and a heat insulating material are penetrated. After making a hole, an ultrasonic probe is used so that a sheath tube having a double tube structure is penetrated and brought into contact with the pipe surface, and the inner surface of the sheath pipe is brought into contact with the pipe surface via a water-filled rubber film. A probe is arranged and a medium liquid is supplied to the ultrasonic probe from the gap between the inner tube and the outer tube of the sheath tube, and a probe is used based on the transmission / reception wave of the ultrasonic probe. A thinning inspection method for a pipe with a heat insulating material, characterized by calculating a pipe thickness.

  In the present invention, a sheath tube penetrating the metal cover and the heat insulating material and contacting the pipe surface, and an ultrasonic wave disposed inside the sheath tube and contacting the pipe surface via a water-filled rubber film Since the probe is provided, it is possible to easily perform the thickness inspection without removing and repairing the piping cover such as the metal cover or the heat insulating material. In addition, since the ultrasonic probe is brought into contact with the pipe surface through a rubber film filled with water, even if the pipe surface is somewhat rough, the pipe thickness can be accurately measured without using a medium solution. Is possible.

  Hereinafter, the present invention will be specifically described with reference to the drawings. FIG. 1 is a diagram showing an example of a device configuration for carrying out the present invention. In the figure, 1 is a metal cover, 2 is a heat insulating material, 3 is a pipe, 4 is a sheath tube, 5 is an ultrasonic probe, 6 is a rod, 7 is a water-filled rubber film, and 8 is a probe. Show.

  The pipe with a heat insulating material is often used for a pipe of an oil refinery plant or a power plant in order to improve thermal efficiency, and generally includes a metal cover 1, a heat insulating material 2, and a pipe 3. The pipe 3 has a small one from 50A to a large one of about 200A, and low-pressure steam and hot water flow through the inside thereof. A heat insulating material 2 is wound about 25 to 100 mm in thickness on the outside of the pipe 3, and a material having a heat insulating effect such as glass wool is used. Finally, a metal cover 1 having a thickness of 1 mm or less is wound. The metal cover 1 is often made of SUS, galvanized iron plate, or the like. When low-pressure steam or hot water is flowing inside the pipe, the surface temperature of the metal cover is often close to 100 degrees.

  Conventionally, when measuring the thickness of a pipe with a heat insulating material as described above, it is necessary to stop the operation, remove the iron plate and the heat insulating material, which are metal covers, and take time and cost. The inspection rate was low. In the thinning inspection apparatus for pipes with a heat insulating material of the present invention, an efficient thinning inspection is performed by eliminating the trouble of removing and repairing the iron plate and the heat insulating material.

  First, a hole that allows the sheath tube 4 to pass through the surface of the metal cover 1 is formed. Although the diameter of the hole depends on the size of the ultrasonic probe 5 passed through the inside of the sheath tube 4, it may be at most about 5 mm in diameter. The sheath tube 4 may be a single tube, but in the case of injecting a medium solution, a double tube structure is preferable because the medium solution can be injected smoothly. Next, the sheath tube 4 is inserted through the drilled hole, and the heat insulating material 2 is penetrated, and then brought into contact with the surface of the pipe 3. Thereafter, the rod 6 to which the ultrasonic probe 5 provided with the water-filled rubber film 7 at the tip is first inserted into the inner pipe of the sheath tube 4.

  Then, the ultrasonic probe 5 is brought into contact with the surface of the pipe 3 through the rubber film 7 filled with water. By doing so, the adjustment of the contact angle of the ultrasonic probe 5 to the surface of the pipe 3 is facilitated, and the followability to the pipe surface roughness is improved.

  If the surface of the pipe is rough, it is preferable to inject the medium liquid from the gap between the inner tube and the outer tube of the sheath tube 4 having a double tube structure when inserting the ultrasonic probe 5 ( Figure 2). After the ultrasonic probe 5 is brought into contact with the surface of the pipe 3 through a rubber film 7 filled with water, the probe 8 calculates a transmission / reception wave and measures the pipe thickness.

It is a figure which shows an example of the apparatus structure for implementing this invention. It is a schematic diagram which shows a double tube | pipe structure sheath tube front-end | tip part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal cover 2 Thermal insulation material 3 Piping 4 Sheath tube 5 Ultrasonic probe 6 Rod 7 Water filled rubber film 8 Probe

Claims (4)

It is a thinning inspection device for a pipe with a heat insulating material, which is composed of a metal cover, a heat insulating material, and a pipe in this order from the outside.
A sheath tube that penetrates the metal cover and the heat insulating material and contacts the pipe surface;
An ultrasonic probe disposed inside the sheath tube and in contact with the pipe surface through a water-filled rubber film;
A thinning inspection apparatus for a pipe with a heat insulating material, comprising: a probe for calculating a pipe thickness from a transmission / reception wave of the ultrasonic probe. It is a thinning inspection device for a pipe with a heat insulating material, which is composed of a metal cover, a heat insulating material, and a pipe in this order from the outside.
A sheath tube having a double tube structure that penetrates the metal cover and the heat insulating material and contacts the surface of the pipe;
An ultrasonic probe disposed inside the inner tube of the sheath tube and in contact with the surface of the pipe through a water-filled rubber film;
A probe for calculating the pipe wall thickness from the transmission / reception wave of the ultrasonic probe;
A thinning inspection of a pipe with a heat insulating material, wherein the pipe wall thickness is calculated by the probe while supplying a medium liquid to the ultrasonic probe from the gap between the inner pipe and the outer pipe of the sheath pipe apparatus. It is a thinning inspection method for a pipe with a heat insulating material composed of a metal cover, a heat insulating material, and a pipe in this order from the outside.
After opening a hole penetrating the metal cover and the heat insulating material, the sheath tube is penetrated to contact the pipe surface,
An ultrasonic probe is arranged inside the sheath tube so as to be in contact with the pipe surface through a rubber film filled with water,
A thinning inspection method for a pipe with a heat insulating material, characterized in that a pipe wall thickness is calculated by a probe based on a transmission / reception wave of the ultrasonic probe. It is a thinning inspection method for a pipe with a heat insulating material composed of a metal cover, a heat insulating material, and a pipe in this order from the outside.
After opening a hole penetrating the metal cover and the heat insulating material, a sheath tube having a double-pipe structure is penetrated to contact the pipe surface,
An ultrasonic probe is arranged inside the inner tube of the sheath tube so as to be in contact with the pipe surface through a rubber film filled with water,
The pipe wall thickness is calculated by the probe based on the transmission / reception wave of the ultrasonic probe while supplying the medium liquid to the ultrasonic probe from the gap between the inner tube and the outer tube of the sheath tube. A thinning inspection method for piping with heat insulating material, characterized by