RU2779681C1 - Method for emptying a section of an oil pipeline - Google Patents

Abstract

FIELD: pipeline transport.

SUBSTANCE: invention relates to the field of pipeline transport, and in particular to methods for emptying a section of an oil pipeline. The emptying of the section of the oil pipeline 1, located between the linear locking devices 3, 4, is carried out through jumpers 9, 12, 18 with locking devices 10, 13, 19, mounted in zones (h, h1) with a minimum location height relative to the zero level in the lower part of the pipe, as well as in the zone (H) with the maximum height of the site. In the area with the maximum height of the section relative to the zero level, in the upper part of the pipe wall, a jumper 12 is mounted with a locking device 13 with the possibility of alternately connecting the cavity of the section with a mobile container 6 and the atmosphere through check valves 14, 15. First, the section is emptied into a mobile container 6 with the rest of the shut-off devices closed, and when the pressure in the section cavity decreases below atmospheric, the shut-off devices 10, 19 are opened, installed in zones with a minimum height relative to the zero level, and the section is emptied into mobile containers 5, 20.

EFFECT: invention makes it possible to simplify and increase the efficiency of emptying a section of an oil pipeline.

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Description

The invention relates to the field of pipeline transport, and in particular to methods for emptying a section of an oil pipeline by displacing oil from it into mobile containers and tank trucks.

From the prior art, a method is known for emptying a section of an oil pipeline, including passing a separator piston through it, which is stopped by means of a wedge of a partially closed valve located behind the defective section. At the same time, the valve is completely closed and the separator is moved in the opposite direction by inert gases pumped through the outlet to the partially closed valve located in front of the defective area, followed by its complete closure (see RF patent No. 2079766, F16L 55/10, 05/20/1997).

The disadvantage of this method is the complexity of its implementation and significant costs for the supply of inert gas.

From the prior art, a method is known for emptying a section of an oil pipeline located between linear locking devices, including mounting a jumper connecting the emptied section with a mobile container and equipped with at least one locking device, creating excess pressure in the cavity of the section, pumping oil into the mobile tank from the section (see RF patent No. 2518748, F16L 55/10, 06/10/2014), which is taken as a prototype.

The disadvantage of this method is the difficulty of creating excess pressure by supplying an inert gas.

The technical objective of the claimed invention is to simplify and improve the efficiency of emptying the pipeline section.

The solution of this problem is achieved by the fact that in the method of emptying a section of an oil pipeline limited by linear locking devices from adjacent sections, including installation of a jumper connecting the emptied section with a mobile container and equipped with at least one locking device, creating excess pressure in the section cavity, pumping oil into a mobile container from the site, according to the technical solution, the installation of the jumper is carried out in each zone with a minimum height of the site relative to the zero level and adjacent zones of the site in the lower part of the pipe wall, and in the zone with the maximum height of the site relative to the zero level, in the upper part of the pipe wall, an additional jumper is mounted with an additional locking device with the possibility of connecting the section cavity with the atmosphere, while emptying the section into mobile containers is first carried out with the additional locking device closed, and when the pressure is reduced by the cavity of the section below atmospheric - with an additional locking device open.

The proposed method of emptying the pipeline section is illustrated by drawings.

In FIG. 1 shows a piping diagram with a drainable section with one low zone;

In FIG. 2 is a diagram of a pipeline with an emptying section with two low zones.

According to the claimed method, the emptying of section 1 (Fig. 1) of the pipeline 2, located between the linear locking devices 3 and 4, for example, valves, into mobile containers 5 and 6, for example, a tank truck.

To do this, in zone 7 with a minimum height "h" of the location of section 1, relative to zero level 8 (sea level), in the lower part of the pipe wall, at least one jumper 9 is mounted with a locking device 10 with the possibility of communicating the cavity of section 1 with mobile container 5, for example, a tank truck through a pipeline (not shown in the figure). In zone 11 with a maximum height "H" of the location of section 1 relative to the zero level 8, in the upper part of the pipe wall, an additional jumper 12 is mounted with a locking device 13 with the possibility of successively communicating the cavity of section 1 with a mobile container 6 and the atmosphere through check valves 14 and 15 .

Jumper 12 can be equipped with a pressure gauge 16, also a sensor, or a pressure switch (not shown in Fig.).

If there are, for example, two low-lying zones 7 and 17 in section 1 (Fig. 2), respectively, with a height "h" and "h ₁ " relative to the zero level 8, jumpers 9 are mounted in the lower part of the pipe walls of zones 7 and 17 and 18 with shut-off devices 10 and 19. The gas phase is emptied from section 1 through a shut-off device 13 into tank truck 6, and liquids through shut-off devices 10 and 19 into tank trucks 5 and 20.

The method of emptying liquid, including gas, from the site is as follows.

After selecting the section 1 to be emptied (Fig. 1), the linear locking devices 3 and 4 of pipeline 2 close to section 1 are closed. Taking into account the terrain and in accordance with the design documentation for laying pipeline 2, zones 7 and 11 of section 1 are determined with a minimum "h ” and the maximum “H” height above zero level 8, i.e., sea level. Further, in the lower part of the pipe wall of zone 7 of section 1, a jumper 9 with a locking device 10 is mounted. 13 with the possibility of sequential communication of the cavity of section 1 with a mobile container 6, for example, a tank truck and the atmosphere through check valves 14 and 15.

The emptying of the cavity of section 1 of the pipeline 2 begins with the opening of the locking device 13, followed by filling the tank truck 6 with the gas phase, which, if present, accumulates in the upper part of section 1, closer to zone 11 with a maximum height "H" above zero level 8. At full emptying the gas from section 1, determined by the decrease in pressure in the cavity of the section according to the pressure gauge 16, the locking device 10 opens, followed by filling the liquid into the tank truck 5.

Thus, at the initial stage, the gas phase is emptied due to excess pressure, and then, the free movement of the liquid down due to gravity, followed by filling the freed part of section 1 with air from the atmosphere.

Since the valve 10 is installed in the lowest zone of section 1, the residual volume of liquid will be minimal. The liquid (oil) remaining in the cavity of section 1 can be extracted, for example, by the pump of a tank truck 5.

The process of emptying the liquid from section 1 (Fig. 2) with two low zones 7 and 17 is carried out in a similar way. First, the gas phase is emptied into the mobile container 6 when the locking device 13 is opened. With a decrease in pressure in the cavity of section 1, the locking devices 10 and 19 open, followed by the emptying of the liquid into mobile containers (tank trucks) 5 and 20.

Thus, the process of emptying the pipeline section from oil containing gas is carried out in stages: first, the gas phase is taken from the uppermost zone of the section, and then the liquid from the lowermost zone of the section. An almost complete intake is provided from the gas phase section (if any), and then the liquid using the pipeline laying terrain.

Claims (1)

A method for emptying a section of an oil pipeline located between linear locking devices, including mounting a jumper connecting the section being emptied with a mobile container and equipped with at least one locking device, creating excess pressure in the section cavity, pumping oil into the mobile container from the section, characterized in that that the installation of the jumper is carried out in each zone with the minimum height of the section relative to the zero level and adjacent zones of the section in the lower part of the pipe wall, and in the zone with the maximum height of the section relative to the zero level, in the upper part of the pipe wall, an additional jumper is mounted with an additional a shut-off device with the possibility of alternately communicating the cavity of the section with an additional mobile container and the atmosphere through check valves, while first the section is emptied into an additional mobile container with the other locking devices installed in the onah with a minimum height of the section, and when the pressure in the cavity of the section is lower than atmospheric pressure - with open locking devices installed in areas with a minimum height of the location.

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