JPS59200959A - Traveling body in pipe - Google Patents

Abstract

PURPOSE:To search a desired position of a pipe body in the peripheral direction with the reduced number of measuring devices by maintaining the attitude of the measuring devices by an eccentric weight always constant independently of the peripheral displacement of a pressure receiving cup. CONSTITUTION:A body 1 is always maintained at the attitude turning its weight fitting side downwards by the action of the eccentric weight 3. If a measuring device is fitted to the eccentric weight side, the thickness reducing state on the lower side of the pipe body can be precisely measured. When a specific bearing of the peripheral direction in the pipe is to be measured, precise measurement can be attained only by fitting a measuring device at a position of the body corresponding to the bearing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an in-pipe traveling body for running inside a pipe for the purpose of detecting corrosion in the pipeline.

Inspection pigs (pipe exploration devices) have been put into practical use for the purpose of detecting corrosion in pipelines. This type of device is moved inside the υ pipe by pressure feeding, etc., and is used to detect thinning due to corrosion along the way. By the way, in submarine pipelines for unloading crude oil, seawater is introduced into the pipe when unloading is stopped, but corrosion of the pipe body is almost limited to the lower part of the pipe body where sediment accumulates. In this case, the purpose of the distortion can be fulfilled simply by investigating the thinning of the lower part of the pipe body. However, with conventional devices, the position and posture of the main body itself in the circumferential direction are not constant while driving, and the position of the measuring device (sensor) is also not constant in the circumferential direction. Possible multiple measuring instruments (sensors)
It is necessary to set up a pipe so that the lower part of the pipe body can be explored regardless of the displacement of the main body. However, measuring instruments for the purpose of non-destructive testing of rods are themselves expensive, so conventional equipment that requires a large number of them is extremely expensive overall. It also consumes a lot of power, so it needs to be equipped with a large amount of batteries, and it also needs to be equipped with a large-capacity data recorder to record the output from a large number of measuring instruments. Furthermore, due to the large number of measuring instruments and the large number of batteries and large capacity data recorders required for these, the volume of the traveling body itself becomes large, and therefore the range of pipeline bends that can be passed through is relatively small. -The disadvantage is that it is limited to those with a small curvature.

The present BA was invented in view of these conventional drawbacks, and aims to provide an in-pipe running body that enables stable exploration of a desired location in the circumferential direction of the pipe with a small number of control devices. Therefore, the present invention comprises a main body to which a measuring instrument is attached, a pressure receiving cup rotatably attached to the outer periphery of the main body via a bearing, and an eccentric weight attached to the main body. The attitude of the attached main body in the circumferential direction is always maintained constant regardless of displacement in the circumferential direction of the pressure receiving cup.

An embodiment of the present invention will be described below with reference to the drawings.

The traveling body of the present invention is composed of a main body (1) on which a measuring instrument is mounted, a pressure receiving cup (2) rotatably provided on the outer periphery of the main body, and an eccentric weight (3) attached to the main body. .

The main body (1) has a cylindrical shape, and usually has a pressure receiving cup (2) on which a measuring device (not shown) is attached to its outer periphery.
) has an annular shape, and bearings (
4). The pressure receiving cup (2) is made of a visible member such as rubber, and its outer periphery is in close contact with the inner surface of the pipe (CP), and the traveling body is moved by this pressure receiving cup (2) and the main body (1). The receiver is designed to travel based on the fluid pressure inside the pipe.

The eccentric weight (3) has a main body (1) rotatable with respect to the pressure receiving cup (2), which is always maintained in a constant posture by means of eccentric weight mounting side metalwork, regardless of displacement in the circumferential direction of the pressure receiving cup. It is something. In this embodiment, the measuring device is attached along the longitudinal direction of one side of the cylindrical body. The measuring device is attached to the main body (1) so as to measure a desired direction in the circumferential direction of the tube. Examples of this measuring device include water immersion ultrasonic probes, eddy current sensor coils, leakage magnetic flux sensors, etc. Such devices are placed inside a pipe as shown in the figure, and measure the fluid pressure from the direction of the arrow in the figure. It is received by the pressure receiving cup (2) and the main body (1), and is fed under pressure throughout the pipe. During this run,
Due to the action of the eccentric weight (3), the main body (1) is always maintained in a position with the weight attachment side facing down, so that, for example, by attaching the measuring instrument to the eccentric weight attachment side, the reduction in the lower side of the tube body can be avoided. It is possible to accurately measure the meat condition.In addition to measuring the bottom of the tube, for example, the top of the tube and other directions, select the mounting position of the measuring device appropriately. This can be done more accurately.

′! ! In addition, if you want to measure the entire circumferential area,
Reduce the mounting range of the measuring device to a fraction of the circumferential direction of the main body (for example, 1/
3), and the circumferential direction of the tube can be divided into several sections.

According to the present invention described above, while traveling, the body carrying the measuring device can be maintained in a constant position in the circumferential direction regardless of the circumferential displacement of the receiving cup. Even when measuring in a specific direction, precise measurements can be made by simply installing a measuring device at the location of the main body corresponding to that direction.This allows the device itself to be provided at a low cost. Since the power consumption can be significantly reduced compared to conventional devices, there are advantages in that only a small amount of batteries are needed for the measuring device, and the data radar can also be used with a small Mfl. In addition, because only a small number of measuring instruments, batteries, etc. are required, the traveling body itself can be made smaller, and it can easily pass through pipeline bends with large curvatures. It is something that has excellent effects that are not conventional (such as being able to do it).

[Brief explanation of the drawing]

1 is a longitudinal sectional view schematically showing an embodiment of the invention in the drawing; FIG.

Claims (1)

[Claims] A running body in a convoluted pipe consisting of a main body to which a measuring device is attached, a pressure receiving cup rotatably attached to the outer periphery of the main body via a bearing, and an eccentric weight attached to the main body.