RU2597274C1 - Oil pumping station for uninterrupted operation - Google Patents

Abstract

FIELD: oil industry.

SUBSTANCE: invention relates to oil pipeline equipment, specifically to oil pumping stations (OPS) of main oil pipelines having tank farms. OPS for uninterrupted operation, connected through a connection unit with a main oil pipeline, comprises equipment linked to a network of pipelines: strainer unit whose input is connected to connection unit, tank farm whose input is connected to output of strainer unit, booster station whose input is connected to output of tank farm, main pump station, connected to output of booster station, wherein output of main pump station via a pressure control unit is connected to connection unit, wherein output of strainer unit is connected via a check valve to input of main pump station, on pipeline connecting output of booster station to input of main pump station, after point of connection of output of check valve there is a unit of spring-loaded dump safety valves, whose output is connected to an emergency discharge reservoir, and on pipeline connecting output of strainer unit to input of tank farm, there is a disconnecting valve.

EFFECT: technical result is providing uninterrupted operation and increased safety of oil pumping station by using a check valve to switch flow of pumped oil supplied from main oil pipeline to input of main pump station during disconnection of tank farm.

1 cl, 1 dwg

Description

The invention relates to oil pipeline equipment, namely to oil pumping stations (NPS) of main oil pipelines, incorporating tank farms.

In order to create and maintain sufficient pressure in the main oil pipelines to ensure oil transportation, pumping systems are created, the main element of which are oil pumping stations operating according to the “with a connected capacity” or “from tank to tank” scheme.

A known system for pumping oil through a main oil pipeline, containing a main oil pipeline equipped with shut-off and control valves, a head oil pumping station with a connection node to a pressure pipeline, a tank farm, pumping equipment, including main and booster pumps, oil reception and injection units (patent for RU invention 2352857 C1, IPC: F17D 1/08, F16L 55/00, F16K 31/12, published on 04/20/2009).

This system allows you to transport oil and oil products through the pipeline. However, in the event of an emergency in the tank farm and its subsequent disconnection from process pipelines, it is necessary to stop pumping oil or oil products in this section of the main pipeline.

Also known is a typical technological scheme of an oil pumping station (Pipeline transport of oil / Edited by S. M. Vainshtok. Textbook for universities. 2 volumes. - M.: Nedra-Business Center, 2002. - T. 1, p. 158) which contains the following basic elements:

- main pumping station (main pumps);

- booster pump station (booster pumps);

- connection of pipeline communications (piping);

- reservoir Park;

- technological equipment (filter-catcher unit, pressure control unit, emergency discharge tank);

- safety valves (two valve units);

- technological valves (valves and gates).

By the totality of the features and the technical result achieved, this scheme of the oil pumping station is the closest to the claimed invention and is selected as a prototype.

The existing typical technological scheme of the oil pumping station provides for separate operation of sections of the main pipeline before and after the oil pumping station. Moreover, in accordance with regulatory requirements, in the event of an emergency in the tank farm, it is provided that it is disconnected from process pipelines at the inlet of the pump station only after pumping is stopped at the site to the pump station.

This requirement is due to the need to exclude exceeding the allowable working pressure of the linear part of the main oil pipelines and the allowable pressure of the process pipelines and equipment of the pumping station. This requirement causes the following undesirable consequences (disadvantages):

- the need to shut off the tank farm leads to a stop of pumping in the previous section of the main oil pipeline;

- the oil flow into the tank farm in an emergency continues during the stopping time of the previous section of the main oil pipeline. At the same time, if the emergency situation is associated with a fire in the tank, then the burning tank will be replenished with oil from the main pipeline for the duration of its stop and closure of the tank valves.

The task of the invention is to ensure the continuity of oil pumping in the event of an emergency in the tank farm of an oil pumping station.

The technical result is to ensure uninterrupted operation and increase the safety of the oil pumping station by switching the check valve to the flow of pumped oil from the main pipeline to the inlet of the main pumping station when the tank farm is turned off.

The problem is solved, and the technical result is achieved due to the fact that the oil pumping station of uninterrupted operation, connected through the connection unit to the main oil pipeline, contains equipment connected by a network of process pipelines: a dirt trap unit, the input of which is connected to the connection unit, a tank farm, the input of which is connected with the output of the filter-strainer assembly, a booster pump station, the input of which is connected to the outlet of the tank farm, a main pump station connected to the output of the booster pump station, and the output of the main pump station through the pressure control unit is connected to the connection unit, while the output of the filter strainer unit is connected via a check valve to the inlet of the main pump station, on a pipeline connecting the outlet of the booster pump station to the input of the main pump station, after the point of connection of the outlet of the non-return valve, a node of the reset spring safety valves is installed, the output of which is connected to the emergency discharge tank, and a shut-off valve is installed on the pipeline connecting the outlet of the filter-strainer assembly to the inlet of the tank farm.

In addition, the pipelines connecting the filter-strainer assembly to the shut-off valve and the check valve, and the pipeline connecting the check valve to the main pump station are designed for a nominal pressure of 2.5 MPa.

The claimed invention is illustrated by a drawing (Fig. 1), which shows a flow diagram of a pumping station uninterrupted operation.

The positions in the drawing indicate:

1 - main pumping station;

2 - booster pump station;

3 - tank farm;

4 - node dump spring safety valves;

5 - node strainer filters;

6 - shut-off valve;

7 - pressure control unit;

8 - emergency dump tank;

9 - check valve;

10 - connection node;

11 - main oil pipeline.

An oil pumping station of uninterrupted operation, like standard pumping stations, contains a series of filter-strainers 5, a tank farm 3, a retaining pump station 2, a main pump station 1, a pressure control unit 7, the input and output of which are connected to the output and the input of the connection node 10 of the main pipeline 11.

The proposed technological scheme of the oil pumping station of uninterrupted operation, in contrast to the standard one, provides the equipment of a jumper with a check valve 9 for connecting the process pipe at the inlet of the pumping station (after the filter-strainer unit 5) and the pipeline at the inlet of the main pumping station 1. To do this, install pipelines connecting the filter unit dirt traps 5 with a shut-off valve 6 and a check valve 9, and a pipeline connecting the check valve 9 to the main pump station 1, which e calculated for nominal pressure of 2.5 MPa.

As a result, the output of the filter-strainer unit 5 is connected through a non-return valve 9 to the inlet of the main pump station 1, the node of the reset spring safety valves 4, the output of which is connected to the emergency discharge tank 8, is located on the pipeline connecting the output of the booster pump station 2 to the input of the main pump station 1, after the connection point of the output of the non-return valve 9. The input of the shut-off valve 6 is connected to the output of the filter-strainer 5 assembly and the input of the non-return valve 9.

In an oil pumping station of uninterrupted operation, only one node of the discharge spring safety valves 4 is required (in existing typical oil pumping stations, two nodes with discharge pipelines from these nodes to the emergency discharge tank are used), located on the pipeline connecting the outlet of the booster pump station 2 to the input of the main pumping station 1, after the connection point of the outlet of the check valve 9.

These technical innovations, in addition to solving the main problem - ensuring the continuity of oil pumping in the event of an emergency in the tank farm of the oil pumping station, provide an additional advantage, namely: taking into account the higher response pressure of the reset spring safety valve assembly 4 (Fig. 1) (up to 2, 5 MPa) in comparison with the excluded node of the discharge spring safety valves (up to 1.6 MPa) the discharge performance is reduced, which leads to a reduction in the required reserve capacity emergency release flare 8.

The claimed device operates as follows.

In the event of an emergency in the tank farm 3, it is immediately disconnected from the filter-strainer unit 5 by closing the shut-off valve 6 without stopping the pumping. After closing the shutoff valve 6 and shutting off the tank farm 3, the pressure at the inlet of the non-return valve 9 increases, which automatically opens, and the oil flow is directed through the jumper to the inlet of the main pump station 1, which transfers to the next section of the main oil pipeline 11.

The pressure increase at the inlet of the main pump station 1 (and, accordingly, at the outlet of the booster pump station 2) due to the oil flow from the main oil pipe 11 occurs to a value corresponding to the pressure characteristic of the booster pump of the booster pump station 2 at zero flow. Upon reaching this pressure, the booster pump station 2 is turned off. After disconnecting the booster pump units of the booster pump station 2, the pressure at the inlet of the main pump station 1 (and therefore, at the outlet of the booster pump station 2) will decrease to a value supported by the automatic pressure control system of the pressure control unit 7 connected to the output of the main pump station 1.

The oil pumping station, made according to the proposed process flow diagram, provides the possibility of immediate shutdown of the tank farm 3 by a shut-off valve 6 in the event of an emergency in it without stopping pumping at the previous technological section of the main pipeline.

When this happens, the automatic transfer of the oil flow coming from the filter-strainer unit 5 directly to the entrance to the main pumping station 1, which carries out pumping at the next technological section of the main pipeline.

When tank farm 3 is turned off and the NPS switches to the “from pump to pump” operating mode (that is, when the oil flow is connected directly to the input of the main pump station 1), which is a regular transition, it is necessary to consider the possibility of emergency shutdown of the main pump station 1 (for example, when power outage). At the same time, the main oil pipeline 11 will switch to the “bypassing the NPS” operating mode through the check valve installed in the connection unit 10.

This mode is abnormal (emergency) and is characterized by the growth of "passing" pressure at the inlet of the NPS. Under these conditions, pressure protection of the NPS technological pipelines and the linear part of the main oil pipeline 11 is ensured by the dump spring safety valve assembly 4 installed on the pipeline connecting the outlet of the booster pump station 2 to the inlet of the main pump station 1, after the connection point of the outlet of the non-return valve 9.

The site of the discharge spring safety valves 4 limits the pressure at the intake of the NPS to 2.5 MPa. In this case, the diagram of the permissible working pressure of the linear part of the section of the main oil pipeline 10 before entering the considered LPS (Fig. 1) must satisfy the diagram of maximum pressures constructed taking into account the maximum pressure at the outlet of the previous LPS (not shown) of the technological section and the maximum pressure 2, 5 MPa, limited by the site of the dump spring safety valves 4 of the considered NPS. When stopping the main pumping station 1, a team must be formed to turn off the previous technological section of the main oil pipeline 11.

The advantages of the device made according to the proposed technological scheme:

- it is possible to immediately shut off the tank farm with a valve in case of an emergency in it without stopping pumping in the previous section. At the same time, the volume of product entering the tank farm during an emergency is reduced, thereby increasing the safety of the oil refinery;

- excludes the construction of one of the two nodes of the discharge spring safety valves with discharge piping from this node;

- reduces the required capacity of the emergency discharge tank.

A prototype oil pumping station of uninterrupted operation was designed, and its prototype showed the basic operability of the installation.

The invention ensures the continuity of oil pumping in the event of an emergency in the tank farm of an oil pumping station.

Uninterrupted operation and increased safety of the oil pumping station were achieved by switching the flow of pumped oil coming from the main pipeline to the inlet of the main pumping station when the tank farm was turned off by a check valve.

Claims (2)

1. An oil pumping station of uninterrupted operation, connected through a connection unit to a main oil pipeline, characterized in that it contains equipment connected by a network of technological pipelines: a strainer-strainer unit, the input of which is connected to a connection unit, a tank farm, the input of which is connected to the output of the strainer-trap unit a booster pump station, the input of which is connected to the outlet of the tank farm, a main pump station connected to the outlet of the booster pump station, m the output of the main pumping station through the pressure control unit is connected to the connection unit, while the output of the filter-strainer unit is connected via a non-return valve to the input of the main pumping station, on the pipeline connecting the output of the booster pump station to the input of the main pumping station, after the connection point of the return output of the valve, a node of the reset spring safety valves is installed, the output of which is connected to the emergency discharge tank, and on the pipeline connecting the output of the f ltrov strainer to an input of the tank farm, set breaking valve. 2. The oil pumping station of uninterrupted operation according to claim 1, characterized in that the pipelines connecting the filter-strainer assembly with the shut-off valve and the check valve, and the pipeline connecting the check valve to the main pump station are designed for a nominal pressure of 2.5 MPa.

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