RU2115090C1 - Method of measuring of pipeline flow section - Google Patents

Abstract

FIELD: measurement technology. SUBSTANCE: by means of first ultrasonic transducer positioned on external surface of pipeline ultrasonic oscillations are introduced normally to external surface of pipeline through pipeline wall, deposits on internal surface of pipeline and through flow section filled with liquid. Ultrasonic oscillations reflected from boundary between liquid and opposite internal surface of tube having deposits are taken by the same ultrasonic transducer. Oscillation passage time t₁ is measured. This done, second ultrasonic transducer positioned on external surface of pipeline diametrically opposite to first ultrasonic transducer is used to radiate ultrasonic oscillations in direction of first ultrasonic transducer. Ultrasonic oscillations reflected from boundary between liquid and opposite internal surface of tube having deposits are taken, and time t₂ of passage of ultrasonic oscillations is measured. Then time t₃ of ultrasonic oscillation passage from first to second ultrasonic transducers is measured, and pipeline flow section is determined by formula: D = [(t₁+t₂-2t₃)c]/2, where D is diameter of pipeline flow section and C is speed of ultrasound in liquid. Measurements can be performed with pipeline filled with water. EFFECT: higher accuracy of pipeline flow section measurement, performance of measurements without interruption of pipeline operation. 2 cl, 1 dwg

Description

 The invention relates to the field of ultrasonic testing of products and can be used to measure the bore of pipes with internal deposits.

 The technical task to be solved is to increase the accuracy of measuring the bore of the pipeline taking into account deposits on the inner walls of the pipe and to carry out the measurement without interrupting the operation of the pipeline.

где
D - диаметр проходного сечения трубопровода;
C - скорость ультразвука в жидкости.The technical problem to be solved is achieved by the fact that in the method of measuring the bore of the pipelines using the first ultrasonic transducer located on the outer surface of the pipeline, ultrasonic vibrations are introduced along the normal to the outer surface of the pipeline through the wall of the pipeline, deposits on the inner surface of the pipeline and the flow passage filled with liquid, receive by the same ultrasonic transducer reflected from the interface between the liquid and the opposite internal By the presence of pipes with deposits, ultrasonic vibrations are measured and the time t _{1 of} their passage is measured, then using a second ultrasonic transducer mounted on the outer surface of the pipeline diametrically opposite the first ultrasonic transducer, ultrasonic vibrations are emitted to the side of the first ultrasonic transducer, receive reflected from the interface between the liquid and ultrasonic vibrations on the opposite inner surface of the pipe with deposits and measure their passage time t ₂ ia, then measure the time t _{3 the} passage of ultrasonic vibrations from the first to the second ultrasonic transducer and the bore of the pipe is determined by the formula

Where
D is the diameter of the bore of the pipeline;
C is the speed of ultrasound in the liquid.

 Measurements can be taken when filling the pipeline with water.

 The drawing shows a device with which this method can be implemented, comprising an exciting pulse generator 1, the output of which is connected to the input of the switch 2, the first 3 and second 4 ultrasonic transducers are connected to it, the output of which is connected to the amplifier 5, its output to its the turn is connected to the input of the oscilloscope 6, the synchronization input of which is connected to the generator 1 of the exciting pulses. The first ultrasonic transducer 3 is mounted on the outer surface of the pipeline 7, filled with liquid 8, for example water, and having deposits 9 on the inner surface of the pipeline. The second ultrasonic transducer 4 is mounted on a diametrically opposite outer surface of the pipeline 7 is diametrically opposed to the first ultrasonic transducer 3.

 Consider the implementation of the method using the described device.

The measurement process can be divided into three stages. At the first stage, the generator 1 of exciting pulses generates pulses, which through the switch 2 are supplied to the first ultrasonic transducer 3, which excites ultrasonic vibrations in the pipeline 7. The same first ultrasonic transducer 3 receives ultrasonic vibrations reflected from the interface between the liquid and the opposite inner surface of the pipe with deposits, which are fed through the commutator 2 to the input of the amplifier 5, and then to the oscilloscope 6 operating in the external synchronization mode from the exciting pulse generator 1. The oscilloscope 6 measures the time t _{1 of the} passage of ultrasonic vibrations from the first ultrasonic transducer 3 to the interface between the liquid and the opposite inner surface of the pipeline with deposits and vice versa.

At the second stage, the pulses of the generator of exciting pulses 1 through the switch 2 are fed to a second ultrasonic transducer 4 mounted on the outer surface of the pipeline diametrically opposite the first ultrasonic transducer 3. The second ultrasonic transducer 4 emits ultrasonic vibrations towards the first ultrasonic transducer 3, receives reflected from the interface between ultrasonic vibrations that h Through the switch 2 are fed to the input of the amplifier 5, and then to the oscilloscope 6, operating in the external synchronization mode from the generator 1 of the exciting pulses. The oscilloscope 6 measures the time t _{2 the} passage of ultrasonic vibrations from the second transducer 4 to the interface between the liquid and the opposite inner surface of the pipe with deposits and back.

где
D - диаметр проходного сечения трубопровода;
t₁ - время прохождения ультразвуковых колебаний от первого преобразователя до границы раздела между жидкостью и противоположной внутренней поверхностью трубы с отложениями и обратно;
t₂ - время прохождения ультразвуковых колебаний от второго преобразователя до границы раздела между жидкостью и противоположной внутренней поверхностью трубы с отложениями и обратно;
t₃ - время прохождения ультразвуковых колебаний от первого до второго преобразователей;
C - скорость ультразвука в жидкости.At the third stage, pulses from the generator of exciting pulses 1 through the switch 2 are fed to the first ultrasonic transducer 3, and the second ultrasonic transducer 4 is used as the receiving one, the signal from which is sent through the switch 2 to the amplifier 5 and then to the oscilloscope 6 and the transit time t _{3 is} measured ultrasonic vibrations from the first ultrasonic transducer 3 to the second ultrasonic transducer 4, the pipe bore is determined by the formula

Where
D is the diameter of the bore of the pipeline;
t ₁ is the transit time of ultrasonic vibrations from the first transducer to the interface between the liquid and the opposite inner surface of the pipe with deposits and vice versa;
t ₂ is the transit time of ultrasonic vibrations from the second transducer to the interface between the liquid and the opposite inner surface of the pipe with deposits and vice versa;
t ₃ is the transit time of ultrasonic vibrations from the first to the second transducers;
C is the speed of ultrasound in the liquid.

Claims (2)

1. The method of measuring the bore of the pipeline, which consists in the fact that using the first ultrasonic transducer located on the outer surface of the pipeline, ultrasonic vibrations are introduced along the normal to the outer surface of the pipeline through the wall of the pipeline, deposits on the inner surface of the pipeline and the flow-through section filled with liquid, take the same ultrasonic transducer reflected from the interface between the liquid and the opposite inner surface of the pipe with deposits ultrasonic vibrations and measure the time t _{1 of} their passage, after which, using a second ultrasonic transducer mounted diametrically opposite to the first ultrasonic transducer on the outer surface of the pipeline, ultrasonic vibrations are emitted towards the first ultrasonic transducer, receive reflected from the interface between the liquid and the opposite inner surface pipes with deposits are ultrasonic vibrations and measure the time t _{2 of} their passage, then measure the time t ₃ p the transmission of ultrasonic vibrations from the first to the second ultrasonic transducer and the bore of the pipe is determined by the formula

where D is the diameter of the bore of the pipeline;
C is the speed of ultrasound in the liquid.  2. The method according to claim 1, characterized in that the measurements are carried out when filling the pipeline with water.