RU2452589C1 - Method of pipeline cleaning and device to this end - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to pipeline transportation and may be used for cleaning pipeline inner surface of sediments. In cleaning, required gas and fluid pressure and flow rate are ensured by consecutive feed of fluid and gas into chambers formed by hoses arranged coaxially downstream of pipeline cleaner. By varying hose diameter and fluid pressure, volume of said chambers is varied to feed water and gas to cleaner. Proposed device comprises hoses to make chambers with pipeline, and chamber communicated with gas feed system. Pipeline inside and chamber formed by outer and inner hoses are communicated with fluid feed system.

EFFECT: possibility to clean pipeline with air holes.

2 cl, 2 dwg

Description

The invention relates to pipeline transport and can be used to clean the inner surface of pipelines from deposits. A known method of cleaning pipelines from deposits, which consists in the fact that a pipe-cleaning device is moved through a pipe by a fluid pressure, while the liquid is passed through a cleaning device in the form of jets that remove deposits from the pipe’s inner surface, for example, international application WO 86/02293, B08B 9 / 04, C23F 11/00 of 04.24.1986

The disadvantage of this method is that it inefficiently cleans ash disposal pipelines. The closest prototype is a cleaning method in which a pipe-cleaning mechanism with cuffs is moved by a fluid stream along the periphery of which liquid jets are formed to remove deposits from the pipe wall, RF patent RU 2184902 7 F16L 58/04 of 08/31/2000

Known devices for implementing this method, for example A.S. USSR V8 9/04 995910, 1983, A.S. USSR V8 9/04 No. 1744844, 1988, A.S. USSR B08B 9/04 No. 1688503, 1989.

The disadvantage of these devices is that they do not very effectively clean pipelines of very hard deposits, such as ash removal pipelines.

The closest analogue of the claimed method is a method of cleaning the pipeline, including moving through the pipeline of a pipe cleaning mechanism with cuffs, on the periphery of which liquid jets are formed, removing deposits from the pipe wall, in which deposits are removed from the pipe wall by the pressure of the elastic cuff petals on the deposits, while the jets form the entire surface of the cuff and deposits are removed by a pulsating fluid flow, and in the fluid flow the formation zone of cavitation nuclei is formed (see AS USSR No. 1639800, (tog the same applicant) 1991). In addition, in the known method, as in the claimed one, the liquid jets have different flow rates, because, as follows from the description of the claimed invention (see p. 10), "making elastic petals in the form of plates ... allows you to form jets with different speeds" .

A known cleaning method, according to which compressed gas (air) is supplied in pulses to a liquid stream, is known from RF patent No. 2206415, 2003.

The formation of cavitation nuclei between elastic petals by introducing jets of a stream of liquid, gas (air) and solid particles is also known from RF patent No. 2206415.

The closest prototype is the device according to patent RU No. 2363554 B08B 9/057 of 09/20/2005, an analogue to it is a device for cleaning the pipeline according to the above.with. USSR No. 1639800, containing, as claimed, a shaft with a hub on which elastic and resilient petals are staggered, made with the possibility of contacting with the inner surface of the pipeline.

The disadvantages of the method and device is that they cannot clean pipelines having a large number of fistulas, and also that the pumping equipment does not provide the necessary pressure and fluid flow necessary to move the pipe-cleaning device through the pipeline.

The closest analogue of the claimed invention is auth. USSR SU 1537329 A1, publ. 01/23/1990, a method comprising moving a purification device through a pipeline by supplying a stream of liquid and gas, the necessary pressure and flow rate of liquid and gas being provided by sequentially supplying liquid and gas to the cavity of the sleeve installed behind the pipe-cleaning device and in communication with fluid and gas supply systems.

This method is implemented by the device described in ed. USSR SU 1537329 A1, publ. 01/23/1990, including an elastic sleeve, the end of which is hermetically fixed around the perimeter of the pipe, fluid and gas supply system, traction unit, cleaning device.

The disadvantage of these method and device is the small length of the cleaning.

The prior art use of coaxially laid sleeves in devices for cleaning pipelines (see RF application 2001114538, publ. 05.20.2003).

The disadvantage of this method and device is that it has the difficulty of controlling the change in pressure and flow rate of liquid and gas at considerable distances in pipelines having fistulas.

The objective of the invention is to create the necessary pressures and flow rates of liquid and gas supplied to the pipeline.

The problem is achieved by the combined use of the group of inventions.

A method of cleaning a pipeline, including moving a purification device through a pipeline by supplying a stream of liquid and gas, the necessary pressures and flow rates of liquid and gas being provided by sequentially supplying liquid and gas to the cavity of the sleeve installed behind the pipe-cleaning device and communicating with the liquid supply systems and gas, while the device is equipped with a second sleeve, while the sleeves are placed coaxially one relative to the other, and the sleeves and the pipe are formed cavities, and by eneniya diameter hoses, due to changes in fluid pressure acting on the sleeves, increase or decrease the volume of the cavities formed by the sleeve, due to this change is fed water and gas treatment apparatus. The supply of water and gas by reducing and increasing the cavities formed by the sleeves, allows to simplify the management of the system and speed up work.

Devices for cleaning a pipeline, including a pipe-cleaning device, a chamber in fluid communication with a gas and gas supply system, wherein a reversible drive drum with a flexible coupling is installed in the chamber, which is kinematically connected to the ends of the sleeves, which are installed in the pipeline coaxially relative to each other, and the second ends the sleeves around the perimeter are connected to the chamber pipe, and the sleeves and the pipeline form cavities, while the chamber cavity is in communication with the gas supply system, and the pipe cavity is in communication with the system odachi liquid 7 and the cavity formed by the outer and inner sleeves 6 in communication with the liquid supply system. The communication of the chamber cavity with the gas supply system, the cavity of the pipeline - with the fluid supply system 7 and the cavity formed by the outer and inner arms, with the fluid supply system 6 allows you to speed up the work and simplify their technology.

The drawings show:

figure 1 - camera and purification device;

figure 2 - camera in operation.

The device depicted in figure 1 is made of a chamber 1 in which a drive reversing drum 2 (traction member) is placed. Sleeves 3, 4 are wound on the drum 2. The chamber 1 is in communication with the liquid and gas supply systems 5, 6, 7. A pipe-cleaning device 8 is installed in the pipeline 9.

The device depicted in figure 2, consists of a chamber 1, in which the drive reversing drum 2 is placed, a flexible thread 10 is wound on the drum 2. Slings 12 are fixed on this flexible thread 10 with a clamp 11, which are fixed to the end 13 of the sleeve 3. End 14 sleeves 4 with slings 15 and a clamp 16 attached to a flexible thread 10.

The end 17 of the sleeve 3 is fixed around the perimeter of the pipe 18.

The end 19 of the sleeve 4 is fixed around the perimeter of the pipe 20. The cavity 21 formed by the sleeves 3 and 4 is in communication with the fluid supply system 6.

The cavity 22 formed by the sleeve 4 is in communication with the gas (air) supply system 5.

The device shown in figures 1, 2, operates as follows. The system 7 in the pipeline 9 serves water in front of the sleeves 3, 4. The pipe-cleaning device 8 moves through the pipe 9 and cleans it from deposits.

As the cleaning of the pipeline 9 from deposits, the number of fistulas increases. The water pressure and its flow rate through the pipe-cleaning device is reduced. After the pipe cleaning device 8 has stopped, compressed air is supplied to the sleeve 4 by the system 5. Before this, the entrance of the system 7 to the pipeline is closed.

Sleeves 3, 4 move along the pipeline 9, push water out of the pipeline 9, which moves the pipe-cleaning device 8, which cleans the pipeline from deposits.

Sleeves 3, 4, moving along the pipeline 9, close the fistulas.

After the sleeves 3, 4 are fully deployed, the system 6 begins to supply water, which, moving along the sleeve 3, pushes the pipe-cleaning device 8 through the pipe 9, which cleans the pipe 9 from deposits.

After each stop of the pipe-cleaning device 8 in the pipeline 9 due to pressure loss, the system 5 supplies compressed air to the sleeve 4, which, increasing in diameter, pushes water out of the cavity 21. This water again moves the pipe cleaning device through the pipeline. After all the water has been displaced from the cavity 21, water is supplied to this cavity by the system 6.

These operations are carried out until the pipe-cleaning device comes out of the pipeline.

With the length of the sleeves 3, 4 equal to half of the cleaned section of the pipeline, cleaning is always performed, since the largest number of fistulas is located at the beginning of the pipeline.

Example

The трубопровод 300 mm steel pipe supplying water was cleaned.

The length of the pipeline being cleaned is 3 km.

Two ⌀ 300 mm sleeves were made of reinforced polypropylene.

The length of the sleeves was: external 1000 m, internal 900 m.

The method was carried out by the device depicted in figures 1, 2.

We used a pipe-cleaning device, 300 mm, made in accordance with patent RU 2363554 B08B 9/057 (2006.01).

System 6 supplied water with a pressure of 1.0 MPa with a filling rate of 1.3 m / s.

The pipe cleaner moved 800 m and stopped. After that, compressed air with a pressure of 1.2 MPa was supplied to chamber 1 by system 5. The speed of movement of the sleeves was 1.6 m / s. Thus, the pipe-cleaning device was moved 1700 m. After that, the system 6 supplied water to the sleeve 3, which, squeezing the sleeve 3, squeezed air out of it. A mixture of water and air moved the pipe cleaner to the end of the pipeline.

Moving through the cleaned pipeline of the thermal imaging installation showed:

- the pipeline is cleaned from deposits to metal;

- 164 fistulas with a diameter of 2-8 mm were revealed.

Using the invention allows you to clean pipelines with fistulas.

Claims (2)

1. A method of cleaning a pipeline, including moving a purification device through a pipeline by supplying a stream of liquid and gas to it, at which the necessary pressures and flow rates of liquid and gas are provided by sequentially supplying liquid and gas to the cavity of the sleeve installed behind the pipe-cleaning device and in communication with the supply systems liquid and gas, while the device is equipped with a second sleeve, the sleeves are placed coaxially one relative to the other and cavities are formed between the sleeves and the pipeline, and by changing I of the diameter of the sleeves, by changing the pressure of the fluid agent acting on the sleeves, increase or decrease the volume of the cavities formed by the sleeves, and due to this change, water and gas are supplied to the treatment device. 2. A device for cleaning the pipeline, including a pipe-cleaning device, a chamber in communication with the fluid and gas supply system, while the camera has a drive reversing drum with a flexible connection, which is kinematically connected to the ends of the sleeves that are installed in the pipeline coaxially relative to each other, and the second ends of the sleeves around the perimeter are connected to the chamber pipe, the sleeves and the pipeline forming cavities, the cavity of the chamber communicating with the gas supply system, and the cavity of the pipeline and the cavity formed naya external and internal sleeves, communicated with fluid supply systems.

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