SU1309397A1 - Method of washing pipelines - Google Patents

Abstract

The invention relates to a washing technique and may find application in the cleaning of pipelines in enterprises of the engineering, chemical and food industries. The aim of the invention is to increase the efficiency of flushing pipelines, more efficient use of the capacity of the flushing equipment. The flushing is carried out with a gas-liquid flow with a change in the flow rate of gas and liquid until the maximum force effect on the contaminants is established. This mode corresponds to the maximum friction flow resistance against the walls of the flushed pipeline, i.e. the flow has the maximum cleansing effect. 3 hp F.- ly. (L e co about CD 00 CO m

Description

The invention relates to a washing equipment and can be used for cleaning pipelines at machine building and repair plants, as well as at chemical and food industry plants.

The purpose of the invention is to increase the efficiency of flushing the pipelines and to make more rational use of the capacity of the flushing equipment by carrying out the process to the optimum. Nom for each product mode.

For flushing according to the proposed method, the pipeline is connected to the injection and discharge fittings of the flushing stand. The washing is carried out. by injecting liquid and gas into the pipeline, for example, in a particular case with oil, into which nitrogen is introduced with an excess pressure of 0.05 MPa. To stabilize the flow structure, gas is introduced in 50 gauge lines before entering the flushing pipeline.

Tangential friction stress on the walls of the flushed pipeline using a thermal anemometer If S is the maximum, the cleaning effect is determined by finding the maximum pressure differential over the length of the pipeline, the latter is measured using a differential manometer, and the flow pressure pulsations are measured, if necessary,

d-pressure pulsation pressure. I

During the washing process, the pjiC-xo, liquid and gas are changed, the npii parameter is measured for each cost combination, which is proportional to the ionic force effect of the flow on the particle pollutants. (tangential friction stress, pressure drop over the length of the pipe opus or pressure pulsation), memorize and compare the values of a given parameter - meter and determine the flow rates of liquid and gas at which the maximum parameter w, and a; In the washing process, the flow rate of liquid and gas corresponding to the max-g / value of the parameter, i.e., flushing, is performed at the flow rates of liquid and gas corresponding to the maximum full capacity of the pipeline flows.

 The organization of the movement (the sequence and magnitude of the change in the flow rates of the liquid and gas) to the point of extremum, may be based on the use of signals for the implementation of the method.

five

depending on the gradient of an isp 5p parameter of the paramegram, or deviation signals of the measured parameter from the maximum. In particular, the Gauss-Seydel method (or alternately changing the regulated values — the flow rate of the liquid and the gas) can be applied by the method of finding the maximum of the measured parameter. the fastest gradient

 descent, etc.

Measuring the flow rates of gas and gas, memorizing the values of a parameter proportional to the force effect of the flow on soil particles,

5 and kh. the comparison, as well as other operations necessary to establish the maximum value of the measured parameter, can be as a field operator as a visual observation

3 for indications of the instruments measuring the parameter and manual control of the flow valve of the liquid and gas flow rate and the automatic control system with the search for an extremum performed on the elements of electronics or pneumatic automation.

During the washing process, liquid and gas flow rates are maintained, corresponding to the maximum value of the measured parameter in the flow period, because as a result of a change in the liquid temperature during washing and other reasons, liquid and gas flow rates corresponding to the maximum value of the measured parameter may change. Flushing is carried out until the required purity of the pipeline is achieved, which is controlled by the purity of the working fluid, for example, by means of an optical filter. At the end of the wash, the pipeline is disconnected from the wash stand and preserved. .

5 When cleaning pipelines with high resistance, in particular long pipelines with a length of 30 ... 50 m, that takes place in the areas of centralized flushing and filling

Q and. Products, a parameter should be measured that is proportional to the force effect of the flow on the contaminant particles, both at the entrance to the pipeline and at the output, since, due to the expansion of gas bubbles, the structure of the gas-liquid flow and its cleaning capacity during the passage of long the pipeline varies substantially. In this case, ae periodically

reconfigure the flow rates of the liquid and gas from the corresponding maximum value of the measured parameter at the inlet to the corresponding maximum value of the parameter at the output. This allows the inner surface of the pipeline to be subjected to maximum cleaning effect along its entire length.

The measurement of tangential friction is recommended to be performed using a wall-mounted hot-wire anemometer, which allows you to focus not only on the average but also on the instantaneous values of the tangential friction stresses, which more fully characterizes the separation of contaminants from the surface of the pipeline.

However, thermo-anemometric equipment is relatively complex, therefore, under production conditions, it is often advisable to have a mode corresponding to maximum tangential stresses on the walls of the pipeline being cleaned, to be divided indirectly - according to the maximum pressure drop over the length of the pipeline or the maximum pressure pulsation.

The application of the method makes it possible to efficiently use the power of the washing equipment, achieving the highest possible degree of cleaning of pipelines on it, since when applying the method, a regime with the maximum force effect on the contaminants is achieved. Carrying out the process in the optimum mode makes it possible to reduce the washing time by an average of 15%.

Editor L. Volkova Order 1314

Compiled by L. Prokhorov Tehred V. Kadar

Corrector C

Circulation .Subscribe

VNIIPI State Kog-shteta USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Design, And

As a result of achieving a higher degree of purification, the reliability of the function of the 1 assembled system is exploited.

Claims (4)

Invention Formula I. Method of flushing pipelines by supplying fluid to the pipeline 10 and a gas with the establishment of a maximum cleaning effect of the flow, characterized in that, in order to increase the washing efficiency, the flow rates of the liquid and gas in The process of flushing is measured at each combination of liquid and gas flow rates, a parameter proportional to the force effect of the flow on the contaminant particles, 20 values of this parameter are recorded and compared, and the flow rates of liquid and gas at which the parameter is at its maximum, and maintained during flushing expenses corresponding to the maximum value 25 parameter. 2. A method according to claim 1, characterized by the fact that, during the washing process, the values of the tangential pressure of the friction on the surface of the washed pipe are measured. 3. The method according to claim 1, about ton and y and i with the fact that during the washing process the pressure change over J2 piping length. 4. Method of step 1, which differs from the fact that in the washing process the value of the pressure pulsations is measured. Proofreader SLOkmar