RU21956U1 - DEVICE FOR PIPES TESTING BY INTERNAL HYDRAULIC PRESSURE - Google Patents

Description

Ushroyshshvo for internal pressure test

The inventive utility model relates to a testing technique and can be used to assess the tightness and strength of pipes, in particular, oil grade pipes.

A well-known stand for hydraulic testing of threaded pipes, including sealing elements, the mechanism of their drive and the filing system of the molding fluid (RF patent No. 667844, IPC G01M3 / 08). The disadvantages of this stand include low productivity and lack of reliability.

The closest set of essential features to the proposed device is a device for testing pipes with internal hydraulic pressure, including a crimping plug and head, a drive mechanism, a test fluid supply system and a pressure sensor (Oil sorting pipes. Handbook edited by A.E. Saroyan. M Nedra, 1987, p. 281, 462-464). However, this device does not allow to assess the influence of latent defects in the pipe body and the threaded pipe-sleeve connection and determine their location.

IPC G 01 M 3/02

Z.

providing complete and reliable information about the technical condition of the tested pipes. The problem is solved due to the fact that the device for testing pipes with internal hydraulic pressure, containing a crimping plug with a drive mechanism, a crimping head connected to a test fluid supply system with a pressure sensor integrated in it, and a control unit, the input of which is connected to the output of the sensor pressure, and the first and second outputs are associated respectively with the drive mechanism of the crimping plug and the test fluid supply system, in contrast to the prototype is additionally equipped acoustic emission signal (AE) converters associated with the mechanism for ensuring their acoustic contact with the test pipe and connected to the AE signal processing system, controlled by a throttle valve, the control input of which is connected to the output of the control unit through a blocking circuit, and a recording unit, the inputs of which are connected to outputs of the control unit, AE signal processing system, pressure sensor and blocking circuit, while the input of the mechanism for providing acoustic contact of signal converters E with the test tube is associated with one of the outputs of the control unit.

The technical result that can be obtained by implementing this utility model is to identify hidden defects that are not detectable during conventional hydraulic tests, the duration of which is regulated, for example, GOST 633-80. Such defects are detected.

only with prolonged exposure to loads. The use of a hydraulic test system that allows the analysis of AE signals arising in the test pipe in comparison with the value of the test pressure ensures reliable detection as obvious. So hidden defects, without increasing the duration of the hydraulic tests.

The essence of the utility model is illustrated in the drawing. The device includes a crimping plug 1 with a drive mechanism 2, a crimping head 3, a pressure fluid supply system 4, a pressure sensor 5, transducers 6.7 AE signals, a mechanism 8 for providing acoustic contact of the transducers 6.7 with the test pipe 9, a signal processing system 10 AE, control unit 11, locking circuit 12, adjustable throttling valve 13, and registration unit 14. Transducers 6.7 are high-frequency piezoelectric receivers of acoustic vibrations. The mechanism 8 contains local baths with contact fluid and a mechanical or pneumatic drive clamp to the pipe. System 10 is a microprocessor device provided with a special program for processing AE signals. Block 11 can be made in the form of an electronic device for control signals in accordance with the operation algorithm. Blocking circuit 12 is a set of comparators that generate a blocking signal when triggered. As the valve 13 can be used, for example, a valve from G. B. Master Flo (Canada) with automatic control. Block 14 registration

 KW / SS is a computer with a memory unit and a presentation unit.

The device operates as follows. The test pipe 9 is located on supports (not shown in the drawing) and, according to the Uynpi signal from the control unit 11, is pressed by the drive mechanism 2 at one end to the crimping head 3 and the other to the plug 1. After sealing the pipe 9 in the head 3 and plug 1 to the control input of the fluid supply system 4 from block 11, through the blocking circuit 12, a Uynp2 signal is received and the pipe is filled with the crimping fluid. At the same time, from the block 11, the Tsuprz signal is transmitted to the contact mechanism 8 and the transducers 6.7 are pressed against the pipe surface, which provides acoustic contact using local baths filled with contact liquid (not shown in the drawing). After filling the pipe with a compression fluid and displacing the air at the signal of the control unit 11, the liquid supply system 4 increases the pressure in the pipe to the test RISP. The process of pressure gain is controlled by a pressure sensor 5, the signals from which are fed to the inputs of the control unit 11 and the registration unit 14. With the beginning of pressure increase by the signal Uynp4 t arriving from block 11 to the input of the registration block 14, the processing and registration of AE signals in comparison with the pressure increase begins. In this case, the sealing cuffs of the crimping head and plugs act as an acoustic filter from interference in the fluid supply system. When pressure reaches esa. block 11

through the blocking circuit 12, turns off the fluid supply system 4 and makes a temporary delay in accordance with the test technology. During the pressure increase and during the holding period, the transducers 6f 1 receive signals arising in the test pipe 9 under the action of loads and, converting them into electrical pulses, transmit them to the AE signal processing system 10. The system 10 extracts signals with parameters responsible for the appearance and development of defects in the product, and transfers them to the input of the registration unit 14, where these parameters are compared at the time of their appearance with pressure values. In the absence of developing defects in the test pipe, AE signals are acoustic noises of various origins, which are filtered and limited by system 10 and are not recorded in block 14. If there are developing defects in the pipe under the action of stresses due to internal pressure, they abruptly grow and appear AE signals associated with the development of defects (increase in amplitude, count rate, etc.) according to a linear or exponential law. In this case, the AE signals are recorded in comparison with a change in pressure or with time in the process of pressure increase. At the end of the time interval for holding the pressure Rsch-p from block 11 to the control input of valve 13 through the blocking circuit 12, a control signal Uynps is received. The valve 13 is switched and the test pressure is reset at the selected speed. Limitation

pressure fluid and the appearance of acoustic noise of high intensity, in which AE control is impossible. In the process of depressurization, the system 10 registers signals from possible and non-developing defects, the nature of which consists in the friction of contacting surfaces, for example, cracks. When the Uynpz and Uynps control pulses are supplied from block 11 to the system 4 and valve 13 through the blocking circuit 12, the latter generates and transmits to the block 14 registration blocking an impulse that stops processing and registration of AE signals during the transition process of switching on and off of actuators and devices. The presence of two converters allows the system 10 to determine the location of defects that create AE signals (linear location). Additionally, the converter 7 provides a zone location of the leakage of the pipe-coupling connection, which is achieved by choosing the frequency range of its operation and the time interval for recording received AE signals. If defects are found, regardless of the fact that the pipe has withstood the test pressure, it is deemed unfit for use.

Applicant General Directorate;

/ 4 OAO VNIITneft V V.I. Puzenko

Claims (1)

A device for testing pipes with internal hydraulic pressure, comprising a crimping plug with its drive mechanism, a crimping head connected to a test fluid supply system with a pressure sensor integrated in it, and a control unit whose input is connected to the output of the pressure sensor, and the first and second outputs are connected respectively, with the drive mechanism of the crimping plug and the test fluid supply system, characterized in that it is equipped with acoustic emission signal converters with a mechanism for ensuring their acoustic contact with the test tube and connected to an acoustic emission signal processing system, controlled by a throttle valve, the control input of which is connected to the output of the control unit via a blocking circuit, and a recording unit, the inputs of which are connected to the outputs of the control unit, signal processing system acoustic emission, pressure sensor and blocking circuit, while the input of the mechanism for providing acoustic contact of the acoustic emission signal converters with the test tube is connected to one of the outputs of the control unit.