JPH0462960B2 - - Google Patents

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 truck into a storage tank or the like.

<Conventional technology> As a conventional liquid receiving method,
As shown in Japanese Patent No. 38266, a method is known in which a liquid such as fuel oil is unloaded from a tank truck 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 1 that transports liquid such as fuel oil. The connection pipe 6, the stop valve 4 and check valve 5 provided in each connection pipe 6, the unloading header 7 that connects each connection pipe 6 to the suction side pipe 10 of the unloading pump 11, and the Microfilter 13 and flow rate system 14 provided in discharge piping 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 transferred to a storage tank 1 on land or the like.
I was trying to accept it at 5.

This conventional method has the advantage of short acceptance time because it is a method of direct suction using the pump 11.

<Problems to be Solved by the Invention> However, such a conventional receiving method in which direct suction is performed using the pump 11 has the following problems.

That is, the liquid level of the liquid such as fuel oil in the liquid storage section of the transport vehicle 1 is, for example, from the bottom of the liquid storage section.
If the height drops to 30 cm to 40 cm, the air flows together with the liquid to the suction side of the pump 11 due to the vortex generated by the outflow of the liquid, causing cavitation of the pump 11, making it impossible to operate the pump 11. .

Also, if the pump 11 is empty, the pump 1
In 1, there is a risk that sparks may be generated due to mutual contact between parts or sparks due to static electricity, and if flammable liquids such as fuel oil are accepted, there is a risk of the liquid igniting or exploding. When a large amount of air flows into the pump 11 along with liquid, or when no liquid flows into the pump 11 and the pump 11 is emptying, it is essential for safety to stop suction by the pump 11. It is becoming.

For these reasons, conventionally, when the level of liquid such as fuel oil in the liquid storage section of the transport vehicle 1 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 reduction in operational efficiency is significant. big.

As a countermeasure for this, at first, the liquid was sucked directly from the liquid storage section of the transportation vehicle 1 using a pump, and if the liquid level in the liquid storage section dropped to the level that caused the problem described above, For example, there is a method in which liquid is dropped into a dump tank installed underground using a natural fall method due to gravity that takes advantage of height differences, and the method is later switched to transferring the liquid in the dump tank to a storage tank.

However, in this method, it is necessary to newly install the above-mentioned dump tank underground. When switching from the pump direct suction method to the dump tank drop method, one of the workers monitors the liquid level in the transport vehicle 1, and as the liquid level inside the transport vehicle 1 drops, air is sucked into the pump. Just before that, I sent a signal to one of the other workers waiting below,
It is necessary to close the liquid outlet valve 2 of the transport vehicle 1, and two people, a supervisor and an operator of the outlet valve 2, are required for each transport vehicle 1, which results in an increase in the number of workers. This has the disadvantage of increasing work costs.

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 equipped with means for detecting the liquid level in the tank, etc., and a control means, and automatically controls the operations related to the pump direct suction method and the dump tank drop method, respectively, by the operation of the control means based on the liquid level, etc. This is done by switching to .

However, this method requires expensive equipment such as a means for detecting the liquid level in the tank and a means for controlling it, which increases the equipment cost and cannot be said to be highly practical.

Therefore, in view of the above-mentioned conventional problems, the present invention ensures that liquid is always present in the pump when the pump is started, suppresses damage to the pump at the time of start-up, and smoothes the flow of liquid. , safety measures have been taken when starting the pump to enable it to accept even flammable liquids such as fuel oil, and even when the liquid level in the liquid storage area drops and air flows together with the liquid, the pump will be able to accept even flammable liquids such as fuel oil. ensuring that the liquid is received in a specified relationship between the amount of remaining liquid and the capacity of the receiving pump suction piping system, and protecting the pump by preventing large amounts of air from entering the pump; In addition, safety measures are taken when accepting flammable liquids such as fuel oil, etc., and liquids from transportation vehicles are directly accepted into storage tanks, improving transportation efficiency and operational efficiency, and reducing equipment costs. The purpose is to provide a highly practical liquid receiving method.

<Means for Solving the Problems> For this reason, the liquid receiving method of the present invention includes a liquid storage section of a transport vehicle, and a liquid storage section in which air flows together with the liquid at a time when the liquid level in the liquid storage section is lowered and air flows together with the liquid. connecting the storage tank and said receiving pump suction piping system with a receiving pump suction piping system having a capacity larger than the amount of liquid remaining in said piping system; A process that communicates via pump bypass piping branched from the downstream side of the stop valve, transmits the hydraulic pressure inside the liquid storage section and the hydraulic pressure on the storage tank side to the receiving pump suction piping system, and uses the transmitted hydraulic pressure to After removing the air accumulated in the receiving pump suction piping system from the air bleed means provided in the piping system, the self-priming receiving pump is activated to receive the liquid into the storage tank, and then A method for emptying the liquid storage section of a transport vehicle by operating the self-priming receiving pump even when the liquid level in the liquid storage section of the transport vehicle is low and air flows together with the liquid into the receiving pump suction piping system. do.

<Operation> In this method, at the start of receiving liquid, there is a step of communicating the liquid storage section of the transport vehicle and the receiving pump suction piping system, and a step of connecting the storage tank and the receiving pump suction piping system via pump bypass piping. The self-priming pump is started after the liquid in the liquid storage section and the liquid in the storage tank are used to remove the air accumulated in the receiving pump suction piping system, so the pump suction piping system Even if a part of the pump has a complicated shape, such as a buried pipe, there is always liquid in the pump when the pump is started, which prevents damage to the pump.
In addition, since the liquid flow is smooth and the pump is prevented from running dry, it is safe to receive flammable liquids such as fuel oil.

Moreover, in such a method, the capacity of the receiving pump suction piping system is larger than the amount of liquid remaining in the liquid storage part of the transport vehicle even when the liquid in the liquid storage part drops and air flows with the liquid. Because of the capacity, even if a mixture of both liquid and air enters the receiving pump suction piping system until the liquid in the liquid storage area of the transport vehicle is emptied,
The receiving pump suction piping system will not become empty, a large amount of air will not flow into the self-priming receiving pump, the pump will not be damaged, the next receiving pump can be prepared quickly, and flammable materials such as fuel oil etc. It is also safe to accept sexual fluids.

Therefore, since it can be directly inhaled with a pump, it has the advantage of short intake time, but it also has the advantage of using a self-priming intake pump.
Even if some air flows with the liquid into this self-priming receiving pump, the pump continues to operate and the liquid storage area of the transport vehicle is emptied. It is no longer necessary to take a portion of the vehicle home, which improves transportation efficiency, and in cases where it takes time to drive the transportation vehicle back and forth, it becomes possible to improve driving efficiency.

It is also highly practical, with low equipment costs.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows a liquid receiving system for carrying out the liquid receiving 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. This coupler 18 can be connected to an outlet pipe 21 of a tank 20 serving as a liquid storage section of a tank truck 19 serving as a transport vehicle transporting fuel oil from a refinery or the like. 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 piping 24 has a connecting piping 25 that extends linearly in the horizontal direction and is closed at both ends.
is connected to both end parts of. The connection piping 25
A pipe 26 is connected to approximately the middle part of the pipe 26.
is connected to the lower circumferential portion of an air bleed pipe 27, which serves as an air bleed means, and which is arranged to extend vertically on the ground. A piping 31 in which a ball valve 28, an automatic exhaust float valve 29, and a pressure relief valve 30 are interposed in this order is connected to the upper end of the air vent pipe 27. Furthermore, a drain pipe 33 having a ball valve 32 interposed therein is connected to the lower end of the air vent pipe 27 . Furthermore, a receiving pump suction pipe 34 is provided at the lower circumference of the air bleed pulse 27.
is connected.

The air purge pulse 27 is, for example, 10B (JIS
The loading arms 16, 17, the piping 24, the connecting piping 25, and the receiving pump suction piping 3.
This system automatically extracts air accumulated in the receiving pump suction piping system consisting of four parts.

The automatic exhaust float valve 29 and the pressure relief valve 3
0 is located at the highest position in the receiving pipe when the couplers 18 of the loading arms 16, 17 are connected to the outlet pipe 21 of the tank 20 of the tank truck 19, and is preferably located at the highest position before unloading. Tank 20 of tank truck 19
It should be located at a position lower than the internal liquid level.

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

That is, openings 29a and 29 are provided at the upper and lower ends, respectively.
A float valve body 29B is housed in the main body case 29A provided with the main body case 29A. 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, and is connected to the valve body 29B housing portion of the main body case 29A through a valve hole 29d formed in the valve seat 29c. The opening 29a on the upper end side communicates with the opening 29a.

When the float valve body 29B is lowered by its own weight, the valve hole 29d is open.
A large amount of air that has flowed into the opening 29d at the inlet end is quickly exhausted from the opening 29a at the outlet end.

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

When air enters through the opening 29b, the liquid level drops, so the float valve body 29B lowers under its own weight, the valve hole 29d opens, and the air is automatically exhausted.

The pressure relief valve 30 is a type of check valve, and opens when the differential pressure between the air vent pipe 27 side and the oil collecting can 35 side (described later) is slightly positive, and closes when only slightly negative pressure is applied. With this, the oil collecting can 35
This prevents air from flowing into the air vent pipe 27 from the flame arrester 35a.

The pipe 31 is connected to the upper circumference of the oil collection can 35. A drain pipe 37 with a ball valve 36 interposed therein is connected to the lower end of the oil collecting can 35, and a flame arrester 35a is provided at the upper end. Also, a check valve 3 is provided on the lower circumference of the oil collecting can 35.
8. A piping 40 with a ball valve 39 interposed therein is connected, and this piping 40 is connected to a portion of the receiving pump suction piping 34 near the air vent pipe 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. Note that the capacity of the receiving pump suction piping system including the air bleed pulse 27 is set to be less than the amount of liquid remaining in the tank 20 of the tank truck 19 at the time when the liquid in the tank 20 drops and vortices begin to occur. Set it to a large capacity.

A check valve 42 is installed in the receiving pump discharge pipe 64 extending from the discharge port of the self-priming receiving pump 41.
A pump discharge valve 43 is interposed and connected to the inlet of the microfilter 44. A receiving pump discharge pipe 64 extending from the outlet valve 45 of the microfilter 44 is connected to the main valve 47 of the storage tank 46 that receives the liquid level.

Check valve 42 of the receiving pump discharge pipe 64
and the pump discharge valve 43, that is, from downstream of the check valve 42 to the portion of the receiving pump suction piping 34 in front of the suction port of the self-priming receiving pump 41 via the check valve 49 and the on-off valve 48. The equipped pump bypass piping 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,
During priming, the gas-liquid mixture discharged from the impeller 53 is once guided to the gas-liquid separation chambers 55, 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 the tank truck 19 transporting liquid such as fuel oil from a refinery etc. arrives, preparations for receiving the tank truck 19 are made (confirming the level of the liquid in the tank 20, sampling the liquid, etc.), and this is completed. After that, the outlet pipe 21 of the tank 20 of the tank truck 19 is connected to, for example, the coupler 18 of one of the loading arms 16, and the ball valve 23 on the outlet side of the loading arm 16 is opened, and the pump discharge valve 43 and the pump are opened. The on-off valve 48 of the bypass pipe 50 is opened.

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

Next, confirm that the ball valve 28 is opened by the air release pulse 27.

When the liquid in the tank 20 of the tank truck 19 or the storage tank 46 flows into the receiving pump suction pipe 34, the liquid pressure causes the air accumulated in the loading arm 16 and the receiving pump suction pipe 34 to It flows into the oil collection can 35 via the air bleed pulse 27, the automatic exhaust float valve 29, and the pressure relief valve 30 in this order, and is automatically extracted from the flame arrester 35a of the oil collection can 35.

Note that the liquid on the storage tank 46 side flows back through the pump pipe piping 50 and flows into the receiving pump suction piping 34.

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 one tanker truck 19, loading arm 1
Since air inevitably enters from 6 and 17 to the self-priming receiving pump 41, this air is automatically discharged as described above.

Float valve body 2 of the above automatic exhaust float valve 29
When the sound of vibration of pump 9B (see FIG. 2) is no longer audible and air bleeding is complete, the pump discharge valve 43 and the on-off valve 48 are closed.

After that, start the self-priming receiving pump 41,
The pump discharge valve 43 is gradually opened and adjusted 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 starts, the flame arrester 35a or the oil collection can 35
Air tries to flow into the air vent pipe 27 from inside through the pipe 31, but the pressure relief valve 30 closes to prevent this.

Therefore, tank 2 of tank truck 19
The liquid in 0 is the receiving pump suction pipe 34
and flows into the storage tank 46 via the receiving pump discharge piping 64.

The liquid level in the tank 20 of the tank truck 19 drops and a vortex is generated, and air flows together with the liquid into the receiving pump suction piping system to continue operating the self-priming receiving pump 41. As a result, pump 4
1 sucks the liquid in the tank 20 of the tank truck 19, and when the tank 20 becomes empty, it closes the pump discharge valve 43 and stops the operation of the self-priming receiving pump 41.

At this time, the capacity of the receiving pump suction piping system including the air bleed pipe 27 is larger than that of the liquid remaining in the tank 20 of the tank truck 19 at the time when the liquid in the tank 20 starts to drop and a vortex starts to occur. Due to its large capacity, tank truck 19
Even if a mixture of both liquid and air flows into the receiving pump suction piping system, the receiving pump suction piping system will not become empty until the liquid in the tank 20 is empty. The air does not flow into the self-priming receiving pump 41, and as a result, the pump 41 is not damaged and preparations for the next receiving pump can be made quickly. Moreover, in the self-priming receiving pump 41, it is possible to avoid generation of sparks or static electricity sparks due to mutual contact between components, and even when receiving flammable liquids such as fuel oil, It is safe and eliminates concerns about ignition and explosion.

Next, another embodiment of the liquid receiving method will be described.

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

That is, one day before starting the work of receiving liquid from the tank truck 19, the receiving pump suction piping 34, the pump 41, and the piping around the pump 41 are vented.

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
The outlet valve 45 of the microfilter 44 is normally in an open state. ) Open the on-off valve 48 of the pump bypass piping 50 and the ball valve 23 of each loading arm 16, 17.

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

The air accumulated in the receiving pump suction pipe 34 is removed by the hydraulic pressure in the storage tank 46 through the air vent pipe 27 and the automatic exhaust float valve 2.
9. The oil is automatically discharged to the outside via the pressure relief valve 30 and the flame arrester 35a of the oil collecting can 35.

Note that since the loading arms 16 and 17 are not yet connected to the tank truck 19 and are in a standing state, the liquid in the storage tank 46 will not flow out from the couplers 18 of the arms 16 and 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.

Float valve body 1 of the above automatic exhaust float valve 29
9B (see Fig. 2) when the sound of vibration is no longer audible and air bleeding is complete, remove the pump discharge valve 43, the on-off valve 48 of the pump bypass piping 50, and the ball valves 23 of the loading arms 16 and 17.
occlude.

Then, when the tank truck 19 transporting liquids such as fuel oil from an oil refinery etc. arrives,
Preparations for receiving the tank truck 19 are made (confirming the level of liquid in the tank 20, sampling the liquid, etc.), and after this is completed, the outlet pipe 21 of the tank 20 of the tank truck 19 and the couplers of the loading arms 16, 17 are connected. connection, and open the ball valve 23 on the outlet end side of the loading arms 16, 17.

When the liquid in the tank 20 of the tank lorry vehicle 19 flows into the receiving pump suction piping 34, the small amount of air accumulated in the loading arms 16, 17 and the receiving pump suction piping 34 flows into the tank 20 of the tank lorry vehicle 19. Due to the hydraulic pressure inside, the oil is automatically extracted to the outside via the air bleed pipe 27, the automatic exhaust float valve 29, the pressure relief valve 30, and the flame arrester 35a of the oil collection can 35.

As mentioned above, the automatic exhaust float valve 29
When the sound of the float valve 29B 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 opened and adjusted to a predetermined opening degree.

Then, in the same manner as in the method described above, the pump is operated, and when the tank 20 of the tank truck 19 becomes empty, the pump discharge valve 43 is closed and the operation of the self-priming receiving pump 41 is stopped.

After that, after closing the ball valve 23 on the loading arms 16 and 17 side, the tank truck 19
The loading arms 16 and 17 are removed from the.

In each of the above-mentioned receiving methods, there are two receiving patterns: a case of one tanker truck 19 and a case of two tanks at the same time, and each time the receiving pattern is changed, the opening degree of the pump discharge valve 4 is adjusted, and the flow rate of the liquid is adjusted. Make adjustments.

In the above embodiment, the tank 20 of the tank truck 19 and the receiving pump suction pipe 34 are connected to the loading arms 16, 17.
Although the method of connecting using a flexible hose was adopted, a method of connecting via a flexible hose may also be adopted.

According to this liquid receiving method, the pump 41
Since it is a method of direct inhalation, it not only has the advantage of short acceptance time, but also has the following advantages.

In other words, conventionally, as mentioned above,
If the liquid level in the tank of a tank truck drops to a height of, for example, 30cm to 40cm from the bottom of the tank, air will flow together with the liquid to the suction side of the pump due to the vortex created in the liquid when the liquid flows out, causing cavitation of the pump. occurs, making it impossible to operate the pump.

In addition, if the pump is run dry, there is a risk of sparks being generated due to mutual contact between parts or static electricity, and if the pump receives flammable liquids such as fuel oil, please avoid contacting the liquid. Due to concerns about ignition and explosion, it is necessary to stop suction by the pump for safety reasons when a large amount of air flows into the pump along with liquid, or when the pump is emptying without any liquid flowing into the pump. There is.

However, in the above-mentioned receiving method, when starting to receive liquid, there is a step of connecting the tank 20 of the transport vehicle 19 and the receiving pump suction piping system, and a step of connecting the storage tank 46 and the receiving pump suction piping system to the pump bypass piping 50. The pump 41 is started after the liquid in the tank 20 and the liquid in the storage tank 46 are used to remove air accumulated in the receiving pump suction piping system. Even if there is a buried piping 34a in the system, liquid is always present in the pump 41 when the pump 41 is started, and damage to the pump 41 is suppressed, and the flow of liquid can be made smooth. 41 is prevented from running dry, it is possible to avoid the possibility of sparks caused by mutual contact between parts of the pump 41 or sparks caused by static electricity, and even when receiving flammable liquids such as fuel oil, etc. It is safe and eliminates concerns about the liquid igniting.

Furthermore, as described above, the capacity of the receiving pump suction piping system including the air bleed pipe 27 remains in the tank 20 of the tank truck 19 even when the liquid in the tank 20 decreases and vortices begin to occur. Since the capacity is larger than the amount of liquid, even if a mixture of both liquid and air flows into the receiving pump suction piping system until the liquid in the tank 20 of the tank truck 19 is empty, the receiving pump suction piping system The system never becomes empty,
A large amount of air does not flow into the self-priming receiving pump 41, and as a result, the pump 41 is not damaged and preparations for the next receiving can be made quickly.Moreover, even when receiving flammable liquids such as fuel oil, etc. It is safe because there is no need to worry about the liquid igniting.

Therefore, a self-priming receiving pump 41 is used, and even if some air flows into the pump 41 along with the liquid, the pump 41 continues to be operated to empty the tank 20 of the tank truck 19. Therefore, there is no need to bring back a portion of the liquid that has been specially transported by the tank truck 19, which improves transportation efficiency, and also improves operational efficiency in cases where it takes time to drive the tank truck 19 back and forth. It becomes possible to aim for.

In addition, there is no need to drop the liquid into a dump tank installed underground by gravity and then transfer the liquid in the dump tank to a storage tank later, which reduces equipment costs and reduces work costs. It has the advantage of being highly practical, such as being able to achieve

<Effects of the Invention> As explained above, according to the present invention, at the start of receiving liquid, the liquid in the liquid storage section and the liquid on the storage tank side are transferred to the receiving pump suction piping system through two steps. Since the accumulated air is extracted from the air bleed means provided in the piping system, even if part of the pump suction piping system has a complicated shape such as buried piping,
When the pump is started, there is always liquid in the pump, which prevents damage to the pump, smoothes the flow of liquid, and prevents the pump from drying out, making it easier to avoid flammable liquids such as fuel oil. It is safe to accept.

Moreover, in such a method, the capacity of the receiving pump suction piping system is larger than the amount of liquid remaining in the liquid storage part of the transport vehicle even when the liquid in the liquid storage part drops and air flows with the liquid. Because of the capacity, even if a mixture of both liquid and air enters the receiving pump suction piping system until the liquid in the liquid storage area of the transport vehicle is emptied,
The receiving pump suction piping system will not become empty, a large amount of air will not flow into the self-priming receiving pump, the pump will not be damaged, the next receiving pump can be prepared quickly, and flammable materials such as fuel oil etc. It is also safe to accept sexual fluids.

Focusing on the action of the self-priming receiving pump, we have developed a self-priming system that is capable of self-priming even when the liquid level in the liquid storage section inside the transport vehicle drops and some air flows into the receiving pump suction piping system along with the liquid due to vortices, etc. Since the type receiving pump continues to operate and empties the liquid storage area while sucking the air inside the liquid storage area of the transport vehicle, the transport efficiency and operating efficiency of the transport vehicle are improved, and equipment costs are reduced. I can figure it out.

The liquid receiving method of the present invention is extremely effective as a safety measure when receiving flammable liquids such as fuel oil as described above, but it is not limited to flammable liquids, but can also be applied to other general liquids. It goes without saying that it can also be used for receiving vehicles, and that the above-mentioned advantages such as improving the transportation efficiency of the transport vehicle can be exhibited.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a system for carrying out the liquid receiving method according to the present invention, FIG. 2 is a vertical sectional view showing a specific configuration of the automatic exhaust float valve in FIG. 1, and FIG. This figure is a vertical sectional view showing a specific configuration of the self-priming receiving pump in FIG. 1, and FIG. 4 is a schematic configuration diagram illustrating a conventional liquid receiving method. 19...tank truck, 20...tank,
27... Air bleed pipe, 34... Receiving pump suction piping, 41... Self-priming receiving pump, 42... Check valve, 46... Storage tank, 50
...Pump bypass piping, 64...Reception pump discharge piping.

Claims (1)

[Claims] 1. A liquid storage section of a transport vehicle and a receiving pump suction piping system having a capacity larger than the amount of liquid remaining in the liquid storage section at the time when the liquid level in the liquid storage section drops and air flows with the liquid. and a step of communicating the storage tank and the receiving pump suction piping system via a pump bypass piping branched from downstream of the discharge side check valve of the self-priming receiving pump of the piping system. , the liquid pressure inside the liquid storage section and the liquid pressure on the storage tank side are transmitted to the receiving pump suction piping system, and the transmitted liquid pressure causes the air bleed means provided in the receiving pump suction piping system to discharge the accumulated air from the piping system. After removing the trapped air, the self-priming receiving pump is activated to receive the liquid into the storage tank, after which the liquid level in the liquid storage section of the transport vehicle decreases and the air is removed together with the liquid. A method for receiving a liquid, characterized in that the self-priming receiving pump is operated to empty a liquid storage section of a transport vehicle even when the liquid is flowing into a pump suction piping system.