JPH02166099A - Reception of liquid - Google Patents

Abstract

PURPOSE:To contrive the improvement of the hauling and operating efficiency of a tank lorry by providing a self-priming pump which is used to empty the tank of the lorry by its continued operation, even if the air, together with the liquid, is allowed to flow into this pump. CONSTITUTION:When a liquid is sent from a tank 20 of a tank lorry 19 or storage tank 46 into a pump suction piping 34, the air staying in a loading arm 16 or the piping 34 is allowed to flow into an oil collecting can 35 through an air vent pipe 27, an automatic exhaust float valve 29 and a pressure relief valve 30 in that order and then automatically drawn out from a flame arrestor 35a. Thereafter, a self-priming pump 41 is started and, even if the liquid surface in the tank 20 is lowered to produce a swirl and the air, together with the liquid, is allowed to flow into the pump suction piping, it is kept running. As a result, the pump 41 empties the tank 20, sucking off the liquid in this truck tank.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for receiving liquid from a transport vehicle such as a tank wagon or a tank lorry into a storage tank or the like.

<Prior art> As a conventional liquid receiving method, Japanese Patent Application Laid-Open No. 55-3826
As shown in Japanese Patent No. 6, a method is known in which a liquid such as fuel oil is unloaded from a tank lorry to a liquid storage tank using an unloading device.

To explain this based on FIG. 4, the unloading device consists of a plurality of pipes connected via flexible hoses 3 to an outlet pipe 9 having an outlet valve 2 of a transport vehicle l that transports liquid such as fuel oil. connection pipes 6, stop valves 4 and check valves 5 provided in each connection pipe 6, an unloading header 7 that connects each connection pipe 6 to the suction side pipe 10 of the unloading pump 11, and It is composed of a microfilter 13 and a flow meter 14 provided in a discharge pipe 12, and a storage tank 15.

Then, liquid such as fuel oil is directly sucked from the transport vehicle 1 by a pump 11 and received in a storage tank 15 on the land ring.

This conventional method has the advantage that the intake time is short because the pump 11 directly inhales the fluid.

<Problems to be Solved by the Invention> However, with such a conventional receiving method of direct suction using the pump 11, there are the following problems.

That is, when the liquid level of a liquid such as fuel oil in the transport vehicle 1 drops to a height of, for example, 30 cm to 40 cm from the bottom of the liquid storage section 1, the vortex generated as the liquid flows out causes air to flow into the pump 11 along with the liquid. Flows to the suction side of the pump 11 and generates cavity silane, making it impossible to operate the pump 11.

Therefore, when the level of liquid such as fuel oil in the transport vehicle reaches the above-mentioned height, suction by the pump is stopped,
A portion of the liquid that has been purposely transported by transport vehicle 1 is brought back home.

As a result, the transport efficiency is low, and especially when the distance from the place where liquid is loaded onto the transport vehicle 1 to the unloading device is long and it takes time to drive the transport vehicle 1 back and forth, the degree of decrease in operational efficiency is significant. Thick.

As a countermeasure against this, the liquid is first sucked directly from the liquid storage section of the transport vehicle 1 using a pump, and if the liquid level in the liquid storage section drops to a level that would cause the above-mentioned problems. , the liquid is dropped into a dump tank installed underground using a gravity-driven natural fall method that takes advantage of the difference in height.
There is a method in which the liquid in the dump tank is later transferred to a storage tank.

However, in this method, it is necessary to newly install the above-mentioned dump tank underground. In addition, when switching from the pump direct suction method to the dump tank inflow method, one of the workers monitors the liquid level in the transport vehicle 1, and if the liquid level in the transport vehicle 1 decreases, air flows into the pump. Immediately before being sucked in, it is necessary to send a signal to one of the other workers waiting below to close the liquid outlet valve 2 of the transport vehicle 1. This method requires two people, an observer and an operator of the exit valve 2, which increases the number of workers and increases the work cost.

As a technique for solving such problems, there is a liquid receiving device disclosed in Japanese Patent Application Laid-Open No. 62-271900.

This device is provided with means for detecting the liquid level in the tank, etc., and a control means, and operates the pump direct suction method and the dump tank thinning method, respectively, by the operation of the control means based on the liquid level, etc. The program is automatically switched and executed.

However, this method requires expensive equipment such as means for detecting and controlling the liquid level in the tank, which increases equipment costs.
I can't say that I was disappointed in its practicality.

Therefore, in view of the above-mentioned conventional problems, the present invention focuses on the function of a self-priming receiving pump, and provides a method and method for receiving liquid from a transport vehicle into a storage tank using this self-priming receiving pump. By doing so, the purpose is to improve the transport efficiency and operating efficiency of transport vehicles, reduce the number of workers, and reduce equipment costs, etc., and to provide a highly practical liquid receiving method.

<Means for Solving the Problems> For this reason, the liquid receiving method of the present invention connects the liquid storage section of the transport vehicle and the receiving pump suction piping system,
The air accumulated in the piping system due to the liquid in the liquid storage section is extracted from the air bleed means provided in the piping system, and the self-priming receiving pump is activated to receive the liquid into the storage tank, and then the Even when the liquid level inside the transport vehicle is low and air flows together with the liquid into the receiving pump suction piping system, the self-priming receiving pump continues to operate, and the liquid is stored while sucking the air in the liquid storage section of the transport vehicle. This is a way to empty the room.

This method has the advantage of short intake time because it is a method of direct suction with a pump, and also has the advantage of using a self-priming intake pump, which is supplied with air together with the liquid. Even if liquid flows, the pump continues to operate to empty the liquid storage area of the transport vehicle, so there is no need to carry back some of the liquid transported by the transport vehicle, improving transport efficiency. In addition, in the case where it takes time to drive the transportation vehicle back and forth, it is possible to improve the driving efficiency.

In addition, the equipment cost is low, the number of workers can be reduced, and the work cost can be reduced, which is excellent in practicality.

<Example> Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a liquid light injection system for carrying out the liquid light injection method of the present invention.

In this figure, two sets of receiving loading arms 16, 17 are provided on the ground. A coupler 18 is attached to the inlet end of each of these loading arms 16,17.
is installed. This coupler 18 connects an outlet pipe 21 of a tank 20 as a liquid storage part of a tank truck 19 as a transport vehicle that transports fuel oil from an oil refinery or the like.
It is possible to connect to A main valve 22 is interposed in this outlet pipe 21 .

A piping 24 with a ball valve 23 interposed therein is connected to the outlet end of each of these loading arms 16, 17. This pipe 24 is connected to both end portions of a connecting pipe 25 that extends linearly in the lateral direction and is closed at both ends. A pipe 26 is connected to a substantially middle portion of the connection pipe 25, and the pipe 26 is connected to a lower peripheral portion of an air bleed pipe 27, which serves as an air bleed means and is arranged vertically on the ground. There is. At the upper end of this air vent pipe 27 is a ball valve 28. Automatic exhaust float valve29. Pressure relief valve 30
A piping 31 in which these are connected in order is connected. Furthermore, a drain pipe 33 having a ball valve 32 interposed therein is connected to the lower end of the air vent pipe 27 . Further, a receiving pump suction pipe 34 is connected to the lower peripheral portion of the air vent pipe 27.

The air vent pipe 27 is made of, for example, an IOB pipe, and is connected to the loading arm 16° 17 and the pipe 24.
, connection piping 25 and receiving pump suction piping 3
This system automatically extracts the air accumulated in the receiving pump suction piping system consisting of 4 parts. The automatic exhaust float valve 29 and the pressure relief valve 30 are connected to the tank lorry vehicle 19 by the coupler 18 of the loading arm 16° 17.
When connected to the outlet pipe 21 of the tank 20, it is located at the highest position in the receiving pipe, and preferably at a position lower than the liquid level in the tank 20 of the tank lorry 19 before unloading. I'll do what I do.

Here, an example structure and operation of the automatic exhaust float valve 29 will be explained based on FIG. 2.

That is, a float valve body 29B is housed in a main body case 29A having openings 29a and 29b at the upper and lower ends, respectively. A valve seat 29c on which a float valve body 29B can be seated is provided at an upper position inside the main body case 29A.
The valve body 29B housing portion of the main body case 29A and the opening 2 on the upper end side are connected through the valve hole 29d formed in the valve seat 29c.
It communicates with 9a.

When the float valve body 29B is lowered by its own weight, the valve hole 29d is open, so that a large amount of air flowing into the opening 29b at the inlet end is transferred to the opening 29 at the outlet end.
Immediately exhaust air from a.

When the air is exhausted as described above and the level of the liquid flowing in from the opening 29b rises, the float valve body 29B rises and the valve hole 29d is closed.

When air enters through the opening 29b, the liquid level decreases, so
The float valve body 29B is lowered by its own weight, the valve hole 29d is opened, and air is automatically exhausted.

The pressure relief valve 30 is a type of check valve, and opens when the pressure difference between the air vent pipe 27 side and the oil collection value 35 side (described later) is slightly positive, and closes when only slightly negative pressure is applied. As a result, the flame arrester 35a with an oil collection value of 35
This prevents air from flowing into the air vent pipe 27.

The piping 31 is connected to the upper circumference of the oil collection unit 35. A drain pipe 37 with a ball valve 36 interposed therein is connected to the lower end of the oil collecting pipe 35, and a flame arrester 35a is provided at the upper end. In addition, the piping 4 is equipped with a check valve 38° and a ball valve 39 on the lower circumference of the oil collection value 35.
0 is connected, and this pipe 40 is connected to a portion of the receiving pump suction pipe 34 near the air venting vibe 27.

The oil collecting can 35 is used to sample the liquid when receiving the liquid and to collect the sampled liquid during maintenance and management of the storage tank, which will be described later.

Further, the check valve 38 prevents the oil in the receiving pump suction pipe 34 from flowing back into the oil collection can 35.

A part of the receiving pump suction pipe 34 is a buried pipe 34a, and further extends horizontally and is connected to a suction port of a self-priming receiving pump 41 via a strainer 51. A check valve 42 and a pump discharge valve 43 are interposed in a receiving pump discharge pipe 64 extending from the discharge port of the self-priming receiving pump 41 and connected to an inlet portion of a microfilter 44 . Outlet valve 4 of microfilter 44
A receiving pump discharge pipe 64 extending from the receiving pump 5 is connected to the main valve 47 of the storage tank 46 that receives the liquid.

A check valve 49 and an on-off valve 48 are installed between the check valve 42 and the pump discharge valve 43 of the receiving pump discharge pipe 64 and in front of the suction port of the self-priming receiving pump 41 of the receiving pump suction pipe 34. An interposed pump bypass pipe 50 is connected.

Note that 52 is a drain valve of the strainer 51.

Here, the self-priming receiving pump 41 does not require priming operation, which is a disadvantage of a centrifugal pump, and can suck out air and pump water by its own power.

An example of the structure and operation of such a self-priming receiving pump will be explained based on FIG. 3.

The center of the suction port 52 connected to the receiving pump suction pipe 34 is located above the axis of the impeller 53, and has an inlet check valve 54 built therein. An open impeller is used as the impeller 53, and during priming, the gas-liquid mixture discharged from the impeller 53 is once guided to the gas-liquid separation chambers 55 and 56, and only air is discharged to the discharge port. On the other hand, a part of the liquid from which air has been separated passes through the lower recirculation port 57 to the impeller 53.
You will be led to the entrance. When this liquid is sucked into the impeller 53, it draws in the air inside the suction port 52 and functions as a vacuum pump.

The microfilter 44 filters solids in the liquid when it is received into the storage tank.

Next, an example of a liquid receiving method based on such a configuration will be described.

When a tank truck 19 transporting liquid such as fuel oil from a refinery etc. arrives, the tank truck 19
After completing the acceptance procedure 1 (confirming the level of liquid in the tank 20, sampling the liquid, etc.), connect the outlet pipe 21 of the tank 20 of the tank lorry 19 to, for example, the coupler 18 of one loading arm 16. death,
The ball valve 23 on the outlet side of the loading arm 16 is opened, and the pump discharge valve 43 and the on-off valve 48 of the pump bypass piping 50 are opened.

The main valve 47 of the storage a tank 46 and the Yamaguchi valve 45 of the microfilter are normally in an open state, and there is no need to perform any particular opening operation.

In addition, when the receiving pump suction piping 34 is not partially buried piping 34a, or when the piping 34 is short, it is not necessary to open the pump discharge valve 43 or the on-off valve 48.

Next, confirm that the ball valve 28 of the air vent pipe 27 is open.

The liquid in the tank 20 of the tank truck 19 or the storage tank 46 is received by the pump suction pipe 34.
When the air flows into the loading arm 16 and the receiving pump suction piping 34, the air flows into the air venting vibe 27. Automatic exhaust float valve29. Pressure relief valve 3
The oil flows into the oil collecting can 35 through the oil collecting can 35 in order, and is automatically extracted from the flame arrester 35a of the oil collecting can 35.

Note that the liquid in the storage tank 46 is transferred to the pump bypass pipe 5.
0 through the receiving pump suction piping 34
flows into.

If necessary, air is vented from the casing vent (not shown) of the self-priming receiving pump 41 and the vent (not shown) of the piping around the pump.

For example, after receiving liquid from - tank truck 19, air will inevitably enter from the loading arm 16-17 to the self-priming receiving pump 41, so this air will be automatically removed as described above. Therefore, it is discharged.

When the sound of the float valve body 29B (see FIG. 2) of the automatic exhaust float valve 29 vibrating is no longer heard and air bleeding is completed, the pump discharge valve 43 and the on-off valve 48
occlude.

Thereafter, the self-priming receiving pump 41 is started, and the pump discharge valve 43 is gradually opened to adjust to a predetermined opening degree. In this case, be careful not to cause overload and cavitation. The suction pressure of the pump 41 is preferably 400 mmHg or more.

Note that when the self-priming receiving pump 41 is started, air tries to flow into the air venting vibe 27 from the flame arrester 35a or the oil collecting can 35 through the piping 31, but the pressure relief valve 30 closes. Prevent this.

Therefore, the liquid in the tank 20 of the tank lorry 19 flows into the storage tank 46 via the receiving pump suction pipe 34 and the receiving pump discharge pipe 64.

Even if the liquid level in the tank 20 of the tank lorry 19 drops and a vortex is generated, and air flows into the receiving pump suction piping system along with the liquid, the self-priming receiving pump 41 continues to operate. As a result, the pump 41
The tank 20 is emptied while sucking the liquid in the tank 20. In other words, a tank truck running dry
When the tank 20 of the car 19 is empty, the pump discharge valve 43 is closed and the operation of the self-priming receiving pump 41 is stopped.

At this time, it is preferable that the capacity of the receiving pump suction piping system is larger than the amount of liquid remaining in the tank 20 of the tank lorry vehicle 19 at the time when the liquid level in the tank 20 drops and vortices begin to occur. If the capacity of the receiving pump suction piping system is large, the receiving pump discharge piping 64 will not become substantially empty, and the self-priming receiving pump 41
It will not be damaged and you can quickly prepare for the next reception.

Next, another example of the method for adding the amount of liquid will be described.

In this method, the acceptance operation is performed after the acceptance preparation work is performed.

In other words, the amount of liquid from the tank lorry 19 on day 1 is transferred to the receiving pump suction pipe 34 before the start of the filling operation.
, bleed air from the pump 41 and piping around the bomb 41.

First, the main valve 47 of the storage tank 46 and the pump discharge valve 43 are opened (as described above, the main valve 47 and the outlet valve 45 of the microfilter 44 are normally in an open state.

) Open the on-off valve 48 of the pump bypass pipe 50 and the ball valve 23 of each loading arm 16,17.

Next, confirm that the ball valve 28 of the air venting vibe 27 is open.

Then, the air accumulated in the receiving pump suction pipe 34 is removed by the air venting vibrator 27 due to the hydraulic pressure in the storage tank 46. Automatic exhaust float valve 29゜Pressure relief valve 30
The oil is automatically discharged to the outside via the flame arrester 35a of the oil collecting can 35.

Note that since the loading arms 16.17 are not yet connected to the tank truck 19 and are in a standing state, the liquid in the storage tank 46H will not flow out from the coupler 18 of the arm 16.17. .

If necessary, air is vented from the casing vent of the self-priming receiving pump 41 and the vent of the piping around the pump 41.

When the sound of the float valve body 19B (see Fig. 2) of the automatic exhaust float valve 29 vibrating is no longer heard and air bleeding is complete, the pump discharge valve 43, the on-off valve 48 of the pump bypass piping 50, and the loading Arm 16.
17 ball valve 23 is closed.

When a tank truck 19 transporting liquid such as fuel oil from an oil refinery or the like arrives, the tank truck 19 undergoes preliminary acceptance procedures (confirming the level of the liquid in the tank 20, sampling the liquid, etc.). After this is completed, the outlet pipe 21 of the tank 20 of the tank lorry vehicle 19 is connected to the coupler of the loading arm 16.17, and the ball valve 23 on the outlet end side of the loading arm 16.17 is opened.

When the liquid in the tank 20 of the tank lorry 19 flows into the receiving pump suction pipe 34, the loading arm 16, 17 and the receiving pump suction pipe 3
The small amount of air accumulated in the tank lorry 19
Due to the hydraulic pressure in the tank 20, the air is released and the vibe 27.
Automatic exhaust float valve29. The oil is automatically extracted to the outside via the pressure relief valve 30 and the flame arrester 35a of the oil collecting can 35.

As described above, when the sound of the float valve body 29B of the automatic exhaust float valve 29 vibrating is no longer audible and air bleeding is complete, the self-priming receiving pump 41 is started and the pump discharge valve 43 is gradually closed. Open to the specified opening degree.

Then, in the same way as the method described above, when the tank 20 of the tank lorry 19 is empty by running the empty tank,
The pump discharge valve 43 is closed, and the operation of the self-priming receiving pump 41 is stopped.

After this, the ball valve 2 on the loading arm 16 and 17 side
3, the loading arms 16 and 17 are removed from the tank lorry vehicle 19.

In each of the above acceptance methods, the acceptance pattern is
There are two cases: a case with 19 tank trucks and a case with one tank truck at the same time. Each time the receiving pattern is changed, the opening degree of the pump discharge valve 43 is adjusted to adjust the flow rate of the liquid.

In addition, in the above embodiment, the tank lorry vehicle 19
Although the method of connecting the tank 20 and the receiving pump suction pipe 34 using the loading arms 16 and 17 was adopted, a method of connecting them via a flexible hose may also be adopted.

According to this liquid receiving method, since the liquid is directly sucked by the pump 41, there is an advantage that the receiving time is short, and there are also the following advantages.

That is, in the past, as mentioned above, the liquid level in the tank of a tank lorry was, for example, 3
If the height falls to a height of 0 cm to 40 cm, air flows together with the liquid to the suction side of the pump due to the vortex generated in the liquid when the liquid flows out, causing cavitation of the pump, making it impossible to operate the pump.

However, in the above-mentioned receiving method, the self-priming receiving pump 41 is used, and even if air flows together with the liquid into the self-priming receiving pump 41, the pump 41 continues to be operated.
Since the tank 20 of the tank lorry 19 is emptied, there is no need to bring back a portion of the liquid that has been carried by the tank lorry 19, which improves transportation efficiency and reduces the reciprocation of the tank lorry 19. If the operation takes time, it is possible to improve the operation efficiency. In addition, compared to a method in which the liquid is dropped into a dump tank installed underground by gravity using the height difference, and the liquid in the dump tank is then transferred to a storage tank, equipment costs are lower and the number of workers is lower. This also reduces work costs.

Furthermore, there is no need for expensive equipment such as a means for detecting the liquid level in the tank 20 or a means for controlling it, and there is an advantage that the equipment cost does not increase and is excellent in practicality.

<Effects of the Invention> As explained above, according to the present invention, there is provided a liquid receiving method that focuses on the action of a self-priming receiving pump, in which the liquid level in the transport vehicle decreases and air is mixed with the liquid due to a vortex or the like. The self-priming receiving pump continues to operate while the fluid is flowing into the receiving pump suction piping system, and the tank of the transport vehicle is emptied while sucking air inside the transport vehicle.
'It is possible to provide a highly practical liquid receiving method that improves the transport efficiency and operating efficiency of transport vehicles, reduces the number of workers, and reduces equipment costs.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of a system for performing the liquid bone injection method according to the present invention, and FIG. 2 is a tigi diagram showing a specific configuration of the automatic exhaust float valve in FIG.
3 is a longitudinal sectional view showing a specific configuration of the self-priming receiving pump shown in FIG. 1, and FIG. 4 is a schematic configuration diagram illustrating a conventional liquid bone injection method. 19... Tank lorry car 20... Tank 27
... Air bleed pipe 34 ... Reception pump suction piping 41 ... Self-priming reception pump 64
...Reception pump discharge piping

Claims (1)

[Claims] The liquid storage section of the transport vehicle and the receiving pump suction piping system are connected, and the air accumulated in the piping system due to the liquid in the liquid storage section is extracted from the air bleed means provided in the piping system, and self-priming is performed. The self-priming receiving pump is started to receive liquid into a storage tank, and the self-priming receiving pump is then operated even when the liquid level in the transport vehicle is low and air flows into the receiving pump suction piping system along with the liquid. A liquid receiving method characterized in that the liquid storage part of a transport vehicle is emptied while continuously sucking air inside the liquid storage part.