RU69851U1 - LOCKING DEVICE OF PIPELINE WATER DRAINAGE SYSTEM WITH A FLOATING TANK OF THE TANK - Google Patents

Abstract

The locking device is designed to lock the entrance to the pipeline drainage system of the tank for storing oil and oil products with a floating roof, and the drainage pipe of the system passes inside the tank. The device can be used for depressurization of the drainage pipeline and the flow of oil first to the drainage pipeline, and then to the roof of the tank through the inlet of the water intake pipe of the drainage system. A float (8) is attached to the shutter (6) on one side, and a rod (7) on the other. The float (8) can float in oil or oil products, moving the shutter (6) to the inlet (5) up to locking the inlet (5) of the drainage system. The rod (7) slides when the shutter (6) moves along the guide support (9), which prevents the shutter (6) from deviating from the inlet (5). The use of a locking device simplifies and reduces the drainage system, 1 zp f-ly, 1 ill.

Description

The utility model relates to reservoirs having floating roofs and surface water drainage from these roofs, in particular, to shutoff devices of the drainage system, the pipeline of which passes through the internal cavity of the reservoir with hydrocarbon liquid (oil, oil products). Moreover, these locking devices are designed to lock the entrance to the pipeline drainage system when the drainage pipeline is depressurized and when hydrocarbon fluid enters first into the drainage pipeline and then to the tank roof through the inlet of the drainage system water inlet. The utility model can be used in the oil and chemical industries.

Known locking device of the pipeline drainage system for drainage of water from the floating roof of the tank described in US patent No. 2563017 (class of national classification US 220-226, publ. 11.01.1947). According to US patent No. 2563017 drainage of water from the surface of a floating roof is carried out along the following line (figure 5 of US patent No. 2563017). The inlet of the drainage system includes a series-connected vertical water intake pipe 18, supporting its elbow-shaped pipe and a horizontal section of the drainage system with a non-return valve 54 mounted on it. The water intake pipe 18 extends up to the intended surface of the water on the roof. The rainwater collected on the roof enters the open opening of the water intake pipe 18. The horizontal section of the drainage system, located behind the valve 54, is connected to the pipe 50. The pipe 50 passes through the thickness of the hydrocarbon fluid in the tank and is connected to the hole in the wall 10 at the bottom of the tank (figure 4 of US patent No. 2563017). The hole in the wall 10 at the bottom of the tank and, therefore, the outlet of the drainage system can be locked by a valve 55. All parts of the drainage system are hermetically connected to each other.

If the target water level on the roof is exceeded, water will flow into the opening of the water intake pipe 18, its passage through the valve 54 and drainage through the pipe 50 to the bottom of the tank. When valve 55 is opened, water is drained into the sewer.

In the event of damage to the walls of the pipeline 50 or its connections, depressurization of the pipeline 50 occurs. If the valve 55 is closed, the hydrocarbon reservoir fluid tends to fill the pipeline 50 and rise along it. The hydrostatic pressure of a hydrocarbon liquid (even if its density is the same as that of water) is usually higher than that of water, due to the weight of the roof. As a result, hydrocarbon fluid may be on the roof surface.

The non-return valve 54 prevents the exit of hydrocarbon fluid to the roof surface through the water intake pipe 18 when the drain pipe 50 is depressurized. The non-return valve 54 contains a housing and a shutter that moves inside the housing with the possibility of completely blocking the inlet of the drainage system.

The above-described check valve according to US patent No. 2563017 is the closest analogue to the inventive locking device.

The design of the check valve according to US patent No. 2563017 requires its installation on a horizontal section, which must be specially formed, which complicates and lengthens the drainage system.

The objective of the claimed utility model is to simplify the pipeline drainage system, as well as reducing its length in comparison with the closest analogue.

The technical result consists in the possibility of placing a device for locking the entrance to the drainage system in the vertical section of the drainage system, in the water intake pipe due to the design of the valve.

Like the closest analogue, the claimed device for locking the entrance to a pressurized pipeline drainage system, passing in a tank with hydrocarbon liquid and designed to drain water from the surface of the floating roof of the tank, contains a shutter.

In contrast to the closest analogue, a rod is fixedly attached to the shutter at one end and one float on the other, and the float has buoyancy when immersed in a hydrocarbon liquid, effective to displace the shutter until the entrance to the drainage system is locked, and the rod is made with the possibility of vertical sliding along its guide support. The device may include a stopper for the lower shutter position.

The device is shown in the figure with the following notation:

1 - tank with hydrocarbon liquid,

2 - floating roof of the tank,

3 - water intake pipe,

4 - drainage pipeline,

5 - input of the drainage system,

6 - shutter

7 - rod attached to the shutter,

8 - float attached to the shutter,

9 - guide rod support,

10 - the bottom of the intake pipe,

11 - threaded hole in the shutter and float,

12 - stud for connecting the shutter and float.

The claimed device is installed at the input section of the drainage system of the tank 1 with a floating roof 2.

The drainage system includes a water inlet pipe 3 and a drainage pipe 4 connected to it, which passes in the tank 1 and exits through an opening (not shown in the figure) at the bottom of the tank 1. A valve is installed at the outlet of the drainage pipe 4 and a production and storm sewer is connected (in the figure not shown).

The figure shows such a design of the water intake pipe 3, in which the pipe 3 is rigidly attached from below under the hole in the floating roof 2. The input 5 of the drainage system in this case coincides with the hole in the floating roof 2. However, it is possible to design a device in which the pipe 3 exits through the hole in a floating roof vertically up to the target water level on the roof.

The shutter 6 of the inventive device is configured to completely close the inlet 5 of the drainage system. For this, the shutter 6 has, for example, the shape of a solid disk (for example, cylindrical, in the form of a truncated cone or another) with dimensions sufficient to completely close the entrance 5.

On one side of the shutter 6, rod 7 is fixedly attached at one end thereof. This side of the shutter 6 is facing up when the locking device is located in the drainage system. The end of the rod 7, for example, is welded or

attached by means of fasteners to one side of the shutter 6. In the specific embodiment of the device shown in the figure, the end of the rod 7 is attached to the center of the side of the shutter 6, however, it can be attached with an offset from this center.

On the other side of the shutter 6, the float 8 is fixedly attached. This side of the shutter 6 is facing down when the locking device is located in the drainage system. The float 8 may be attached to the shutter 6 as follows. On the longitudinal axis of the shutter 6 and in the float 8 there are threaded holes 11 into which the stud 12 is screwed. The float 8 must have buoyancy when immersed in a hydrocarbon liquid, effective to bias the shutter 6 to the edges of the inlet 5 until the inlet 5 is locked. The float 8 is made, for example, from metal or from a polymeric material resistant to the effects of a hydrocarbon liquid, with or without a cavity inside the float. The parameters of the float 8 are selected depending on the specific design of the locking device.

The rod 7 is made with the possibility of vertical sliding along its guide support 9. The support 9 is, for example, the following structure. The diameter of the inlet 5 is fixed to a narrow metal strip with a through hole on it. The hole is chosen of such a diameter and in such a place on a metal strip to allow the rod 7 to slide in this hole with the vertical movement of the rod 7. The rod 7 together with the shutter 6 is driven by the float 8. The float 8 floats in the hydrocarbon fluid filling the water inlet pipe 3 with depressurization of the drainage system, and carries up the shutter 6 with the rod 7, which slides in the support 9.

The claimed locking device may include a stopper for the lower position of the shutter 6. The stopper is made, for example, in the form of a protrusion (not shown in the figure) on the rod 7, resting in the lower position of the shutter 6 on the edge of the hole 5. The stopper can be formed by the bottom 10 of the water intake pipe 3 (when connecting the drain pipe 4 to the side wall of the pipe 3). At the bottom 10 may be a ledge. The stop in this case will be the bottom 10 of the intake pipe 3 and the protrusion at the bottom 10, which rests on the float 8 (or the end of the stud 12, passing through the float 8). The stopper of the lower position of the shutter 6 ensures that the shutter 6 is in direct

proximity to the lockable hole 5, resulting in increased efficiency and reliability of locking.

The device operates as follows.

With a sealed drainage system, water is removed from the floating roof 2 through the inlet 5, the water intake pipe 3, the drainage pipe 4, the open valve at the outlet of the drainage pipe 4 to the production and storm sewer. The shutter 6 and the float 8 of the locking device are in their lower position, providing an open state of the inlet 5. The lower position of the shutter 6 can be fixed by the stopper.

When the drainage system is depressurized and the valve is closed at the outlet of the drainage pipe 4 (at the bottom of the tank 1), the hydrocarbon liquid begins to flow into the drainage pipe 4 and then goes up to the water intake pipe 3. When the drainage system is filled with hydrocarbon liquid, a float 8 floats. At the same time, the shutter 6, carried away by the float 8, moves upward. The rod 7, sliding upward along the support 9, does not allow the shutter 6 to deviate when it moves from the direction necessary to lock the inlet 5. Then, the float 8 presses the surface of the shutter 6 to the inlet 5 of the drainage system, for example, to the o-ring installed in the hole of the floating roof. As a result, the claimed device locks the input 5 of the drainage system.

Thus, the claimed device for locking the entrance to a pressurized pipeline drainage system, passing in the tank with hydrocarbon liquid and designed to drain water from the surface of the floating roof of the tank, can be placed on a vertical section of the drainage system, in the water inlet pipe. Due to this, the pipeline drainage system as a whole is simplified, and its length is also reduced in comparison with the closest analogue.

Claims (2)

1. A device for locking the entrance to a pressurized pipeline drainage system, passing in a tank with hydrocarbon liquid and designed to drain water from the surface of the floating roof of the said tank, containing a shutter to which the rod is fixedly attached on one side with one end and the float on the other side moreover, the float has buoyancy when immersed in a hydrocarbon liquid, effective to displace the shutter until the entrance to the drainage system is blocked, and the rod is made with air the possibility of vertical sliding along its guide support. 2. The device according to p. 1, characterized in that it contains a stopper for the lower position of the shutter.