KR20030029496A - Carrying method of crude oil and naphtha by dirty/crude oil carrier, and transfer method of the crude oil and naphtha from the carrier - Google Patents

Abstract

PURPOSE: A method for transporting crude oil and naphtha with a carrier and a method for transferring crude oil and naphtha from the carrier are provided to batch-transfer the naphtha and the crude oil from a carrier tank to a storage tank by using one set of piping. CONSTITUTION: A method for transporting crude oil and naphtha with a carrier comprises steps of appointing a crude oil tanker for loading crude oil and naphtha together(S1); appointing one of plural carrier tanks installed to the crude oil tanker for a tank for loading naphtha(S2); compensating a level gauge installed to the tank(S3); previously washing the inside of the carrier tank for carrying naphtha(S4); abstracting crude oil and sludge staying in the bottom part of the carrier tank(S5); starting loading of naphtha into the carrier tank(S6); transporting the loaded naphtha and crude oil to the destination(S7); drawing the crude oil from the piping of the carrier(S8); filling the piping with naphtha and then unloading the naphtha(S9).

Description

Method of transporting crude oil and naphtha by a transporter and a method of transporting crude oil and naphtha from the transporter TECHNICAL FIELD

The present invention relates to a method for transporting crude oil and naphtha using a transporter such as a crude oil tanker and a method for transporting crude oil and naphtha from the transporter to a storage tank on land.

As a vehicle used for transporting oil, a tanker capable of transporting a large amount of oil at a time is generally used. The tanker includes a crude oil tanker carrying crude oil produced in an oil field, and a refined oil tanker carrying clean products (white oil) such as naphtha, kerosene and diesel oil.

Crude oil tankers that transport crude oil are mainly VLCC (Very Large Crude Carrier) with more than 200,000 weight tons of transportation efficiency.

Super-large crude oil tankers, such as VLCC, are difficult to dock in general ports. For this reason, crude oil is loaded by docking at an unloading terminal installed on the sea, usually called sea berth. Alternatively, crude oil is unloaded while mooring to a buoy near the port. After arriving at a destination city bus or the like, the crude oil is transferred from a tank of a crude oil tanker to a crude oil tank on land using pipes.

On the other hand, in general, naphtha is transported by a naphtha-only transport ship (refined oil tanker), and when this refined oil tanker arrives at the destination city bus, it is transported from a tank of refined oil tanker to a naphtha tank on land using a naphtha dedicated pipe. .

However, naphtha-only refined oil tankers have a maximum loading capacity of 70,000 to 100,000 tonnes, a small amount of transportation in one voyage, and a relatively high transportation cost compared to crude oil tankers. There is a problem that the ratio of transportation costs that stops the price increases, so that the cost can not be reduced.

In addition, there may be a case where a crude oil tanker arrives at a city bus and a tank on land, which is usually several kilometers away, have only crude oil pipes and no dedicated pipes for transporting naphtha. For this case, it is required to transfer naphtha to tanks on land by pipeline for crude oil.

Naphtha is one of the purified products obtained by the petroleum refining process, and when it does not need to be distilled or distillation process, it is used as a raw material naphtha of an ethylene manufacturing apparatus (pyrolysis apparatus) and an aromatic manufacturing apparatus in that state.

And it is calculated | required that this raw material naphtha does not contain a heavy compound more than a fixed ratio.

In addition, said "constant ratio" means the ratio of the heavy compound contained in naphtha determined by the processing performance with respect to the heavy compound of an ethylene manufacturing apparatus (pyrolysis apparatus) and an aromatic manufacturing apparatus.

By the way, contrary to these requirements, when a certain amount of naphtha and crude oil are transferred using a single pipe, crude oil is mixed into naphtha, and naphtha contains a certain ratio or more of heavy compounds such as crude oil, and if it is not distilled, it can be used as raw material naphtha. It becomes impossible.

For this reason, there is a demand for a technique for transferring crude oil and naphtha in a state in which crude oil is not mixed with naphtha or the amount of crude oil is minimized.

In view of this, several techniques for transferring crude oil and naphtha by a single pipe have been proposed.

For example, Japanese Patent Laid-Open No. 2001-108200 discloses a technique of a method of transporting naphtha in a crude oil pipeline.

This technology transports a naphtha lot into the crude oil pipeline, with the condensate lot of the head and the condensate lot of the tail inserted into the crude oil pipeline, and at the outlet of the pipeline the interface of the condensate / naphtha of the head. It is a technique of recovering a lot of naphtha upon passage or before the end of substantial passage, and when or substantially after the interface region of the naphtha / tail condensate appears.

In addition, this technique uses a pipeline of approximately several hundred kilometers in total length to determine the timing of collecting lots of naphtha when transferring crude oil and naphtha by measuring the colorimetric or specific gravity of the conveying fluid.

However, in the case of transferring crude oil and naphtha using the technique described in Japanese Patent Laid-Open No. 2001-108200, since the condensate is used as a special separating agent, the conveying process becomes complicated, and a new condensate recovery device needs to be installed. As a result, the cost was increased, and there was a problem that it was not practical.

In addition, since this technique determines the boundary between crude oil and naphtha by measuring the specific color or specific gravity of the conveying fluid, the timing of switching the tank as the storage place cannot be determined with good accuracy, and the amount of crude oil mixed into the naphtha can be obtained. There was a problem that could not be minimized. This problem was more pronounced with longer pipelines.

In addition, when transferring naphtha to crude oil piping, it is also possible to use, for example, a liquid (water, etc.) disclosed in Japanese Patent No. 1981-21960 as a special separating agent for separating naphtha and crude oil. Also in this case, there existed a problem that a conveyance process became complicated.

The present invention was made in view of the above problems, and a first object of the present invention is to provide a naphtha transporting method that can significantly reduce the cost of transporting naphtha and to easily reduce the cost of naphtha.

In addition, the second object of the present invention is to provide a method for transferring crude oil and naphtha which enables a predetermined amount of storage tank naphtha and crude oil to be transferred from a transport tank without using a special separating agent for separating crude oil. do.

In order to achieve the first object, the inventors of the present invention have conceived that the cost of transporting a crude oil tanker is much lower than that of a refined oil tanker transporting naphtha exclusively.

In addition, since naphtha is further distilled to become a raw material for other petroleum products, it is required that the naphtha not contain more than a certain ratio of heavy compounds. The inventor of the present invention focuses on the fact that the properties of naphtha can be kept above a certain level as long as the mixing ratio of the heavy compounds can be made smaller than a constant value, and the present invention is carried by loading naphtha in an inboard tank of a crude oil tanker. Reached.

Specifically, the invention described in claim 1 is a naphtha transporting method using a transporter for transporting crude oil, wherein at least a part of a plurality of transporter tanks provided in the transporter is designated for naphtha stacking. The inside of the dragon's transport tank is cleaned before loading the naphtha, and when the naphtha is loaded or unloaded, crude oil is extracted from at least the piping on the carrier to load or unload the naphtha.

At this time, the cleaning of the transport tank in which naphtha is carried out may be performed by crude oil, as described in claim 2.

By wash | cleaning a conveyer tank beforehand, the crude oil, sludge, etc. which remain in a conveyance tank can be removed substantially. Dedicated cleaners, seawater, etc. may be used. However, by cleaning the inside of the transport tank with crude oil, crude oil remains on the inner wall and bottom of the transport tank, but compared to the amount of naphtha loaded on the transport tank. The amount of crude oil remaining is very small, and the mixing ratio of crude oil can be made sufficiently smaller than the allowable value.

The invention described in claim 3 is a method in which the transporter is a very large crude oil tanker exceeding 150,000 weight tons.

Very large crude oil tankers, such as the VLCC (Very Large Crude Carrier) and ULCC (Ultra Large Crude Carrier), can carry large quantities of crude oil and naphtha at once and are also relatively inexpensive compared to naphtha-only tankers. It is possible to significantly reduce the transportation cost.

The invention described in claim 4 is a method of designating a naphtha stacking vehicle tank spaced apart from the transport tank to which a drain for extracting crude oil in the pipe is connected.

In this way, when the crude oil in the pipe is extracted, the crude oil in the pipe is not mixed with the naphtha, so the amount of crude oil mixed into the naphtha can be reduced.

The invention described in claim 5 is a method of slowly loading the naphtha at a speed not to stir the crude oil residue remaining in the bottom portion of the carrier tank at the beginning after the loading start when the naphtha is loaded. to be.

Moreover, invention of Claim 6 is a method of unloading the said naphtha at the speed which does not stir the crude oil residue which remain | survives in the bottom part of the said carrier tank when unloading the said naphtha.

By doing in this way, the quantity of the crude oil mixed in naphtha can be made as small as possible.

The invention according to claim 7 determines the number of the carrier tanks to be used according to the loading of the naphtha, while suppressing the movement of the center of the crude oil tanker due to the difference in density or specific gravity of crude oil and naphtha. And a method of designating the vehicle tank for loading the naphtha.

In the case of mixing crude oil and naphtha, the movement of the center of the crude oil tanker due to the difference in density or specific gravity of both should be considered. By designating a transport tank as in the invention described in claim 7, the movement of the center can be suppressed, and stable navigation can be ensured even when crude oil and naphtha are mixed.

In order to achieve the second object, the inventors of the present invention have made intensive studies and have found that crude oil, naphtha, and the like that are being transferred from the transport tank to the storage tank alternately with crude oil by using crude oil piping. Even if a mixed fluid composed of crude oil and naphtha is subjected to a flow analysis (hereinafter sometimes referred to as a "flow analysis") and using a transfer method based on this flow analysis, a special separation agent or the like is not used. The present invention has been completed by discovering that naphtha can be transported in a state in which naphtha contamination by crude oil is suppressed.

This makes it possible to transport naphtha together with crude oil in a large crude oil tanker even if there is only crude oil piping from the crude oil tanker to the tank on the ground and there is no dedicated piping for transferring naphtha. In comparison, transportation costs can be greatly reduced.

Specifically, the method for transferring crude oil and naphtha of the present invention is a method for transferring crude oil and naphtha from a transport tank to a storage tank by one pipe, as described in claim 8.

(1) When the naphtha or crude oil is fed from the carrier tank to the storage tank using the pipe, the pipe is connected to a tank for crude oil or naphtha,

(2) the amount of crude oil or naphtha remaining in the pipe connecting the vehicle tank and the storage tank is calculated in advance;

(3) discharging naphtha or crude oil from the carrier tank, and measuring the dispensing quantity;

(4) When the amount of naphtha or crude oil discharged from the carrier tank is about the same as the amount of crude oil or naphtha remaining in the pipe calculated beforehand, the delivery of naphtha or crude oil from the carrier tank is stopped. The tank, which is a storage place, is converted from a tank for crude oil or a naphtha to a tank for naphtha or a crude oil,

(5) After switching the tank, the naphtha or crude oil is resumed from the carrier tank, and the naphtha or crude oil is stored in a naphtha or crude oil tank.

In this case, since the crude oil or naphtha remaining in the pipe can be extruded into the crude oil tank or the naphtha tank by pumping action when the naphtha or crude oil is sent out, the amount of crude oil mixed into the naphtha can be effectively reduced. have.

In addition, since a separation agent or the like for separating naphtha and crude oil may not be used, the transfer process can be simplified.

The invention described in claim 9 performs a flow analysis of the crude oil, naphtha, and a mixed fluid composed of crude oil and naphtha in the pipe, and uses the flow analysis result to determine the naphtha or crude oil from the carrier tank. It is a method of determining the timing to stop sending.

By doing in this way, the amount of mixing of crude oil into naphtha can be controlled with good precision, the heavy compound may be mixed in naphtha more than a fixed ratio, and the problem that naphtha is contaminated with a heavy compound can be prevented.

The invention described in claim 10 is a method in which the temperature, density or specific gravity of the crude oil or naphtha remaining in the pipe is at least a correction element when the amount of crude oil or naphtha remaining in the pipe is calculated in advance.

In this way, the flow analysis can be performed with good accuracy, and, for example, in the case of measuring the amount of naphtha or crude oil discharged from the transport tank based on the amount of crude oil or naphtha extruded into the tank serving as the storage place, the naphtha or The amount of crude oil sent out can be measured with good precision.

In addition, the invention described in claim 11 is a method of measuring the amount of naphtha or crude oil discharged from the transport tank using a chuck of a tank serving as the storage place.

In this way, the amount of naphtha or crude oil discharged from the transport tank can be measured simply and reliably, and the timing at which the tank, which is a storage place, is switched from the crude oil or naphtha tank to the naphtha or crude oil tank with good accuracy can be measured. You can get it.

The invention according to claim 12 is a method of changing the delivery speed of naphtha or crude oil when the crude oil or naphtha remaining in the pipe is extruded into a tank based on the flow analysis result.

In this way, the mixing of crude oil into naphtha can be carried out in a state of minimizing suppression.

In addition, the invention described in claim 13 is a method of changing the delivery speed of the naphtha or crude oil immediately after the start of delivery of the naphtha or crude oil and immediately before the delivery stop.

In this way, if the delivery speed of naphtha or crude oil is changed immediately after the delivery start, the length of the mixed fluid of naphtha and crude oil in piping can be shortened, and the mixing of naphtha and crude oil in piping can be minimized. In addition, if the delivery speed of naphtha or crude oil is changed just before delivery stop, the timing which switches a tank which is a storage place from a crude oil or naphtha tank to a naphtha or crude oil tank can be calculated | required with more accurate.

In addition, the invention described in claim 14 is a method of rapidly increasing the delivery speed of the naphtha or crude oil immediately after the delivery of the naphtha or crude oil to a predetermined delivery speed.

In this way, the mixed fluid in which crude oil and naphtha are mixed with each other can be formed in a short time, that is, the length of the mixed fluid of naphtha and crude oil in piping can be shortened.

1 is a flow chart for explaining the procedure of the transport method of the present invention,

Fig. 2 relates to an example of a determination device that automatically determines and determines the designation of a crude oil tanker and the amount of naphtha mixed in the crude oil tanker.

3 is a plan view of a super crude oil tanker mixed with naphtha and crude oil,

4 is a schematic block diagram for explaining a transfer situation in an embodiment of a transfer method of crude oil and naphtha of the present invention;

5 is a schematic flowchart of an embodiment of a method for transferring crude oil and naphtha according to the present invention;

6 is a schematic diagram for explaining a mixed fluid in a pipe in an embodiment of the present invention;

6A is a sectional view of a state in which naphtha is sent to a pipe in which crude oil resides;

6B is a sectional view of a state in which crude oil is sent to a pipe in which naphtha stays;

7 is a diagram showing a continuous equation (1), a momentum equation (2), a turbulence model equation (3), and a diffusion equation (4) for analyzing the flow state of the present embodiment;

8 is a schematic view for explaining an analysis example of the flow state of the present embodiment;

8A illustrates an analytical model;

8B is a graph showing a change in delivery speed (flow rate);

9 is a graph showing a feed amount with respect to a feed time for explaining a feed state of crude oil and naphtha in the analysis example of the present embodiment;

10 is a graph of concentration curves for explaining a naphtha concentration distribution in the pipe longitudinal direction in an analysis example of the present embodiment.

Explanation of symbols for the main parts of the drawings

1: large tanker 2: crude oil

3: naphtha 4: crude oil tank

6: naphtha tank 11: inboard tank

12: pump 42, 62: chuck

51 pressure gauge 53 piping

54 hydrometer 61 valve

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment of this invention is described in detail according to drawing.

[Description of Transport Method]

1 is a flowchart of the transportation method of the present invention.

First, on the basis of the amount of naphtha to be transported, the amount of crude oil, and the port of destination of the crude oil tanker, a crude oil tanker in which naphtha and crude oil are mixed (step S1). At this time, it is good to select the combination from which the naphtha and crude oil transportation cost is the least among a some combination, and determine the quantity of naphtha mixed with the designation of a crude oil tanker. In addition, for crude oil tankers that may be mixed with naphtha and crude oil, these components may be subjected to early corrosion, such as naphtha and crude oil, in order to prevent premature corrosion of components such as tanks and packings due to differences in the properties of crude oil and naphtha. It is good to replace it with this difficult thing.

The designation of the crude oil tanker and the amount of naphtha mixed in the crude oil tanker can be automatically executed using a judgment device such as a computer.

Fig. 2 relates to an example of a determination device that automatically determines and determines the designation of crude oil tankers and the amount of naphtha mixed in the crude oil tankers.

The judging device 21 includes an input unit 22 such as a keyboard for inputting a transportation plan of crude oil and naphtha, a navigation status monitoring unit 24 for monitoring the navigation status of the owned oil tanker and refined oil tanker, and an input unit 22. A reading / input unit 23 for inputting or reading the transportation plan and the navigation status of the crude oil tanker and the refined oil tanker inputted from) into the database 25, and from the navigation status of the transportation plan and the crude oil tanker and the refined oil tanker. And a processing unit 26 for determining and determining the amount of naphtha mixed with the designation, and an output unit 27 such as a printer or display for outputting the processing result of the processing unit 26.

The navigation status monitoring unit 24 reads the navigation statuses received from each crude oil tanker and refined oil tanker in flight, transmits them to the input unit 23, and inputs them to the database 25.

The database 25 includes the types and names of crude oil tankers and refined oil tankers owned, load capacity of each crude oil tanker and refined oil tankers, and the current navigation status of each crude oil tanker and refined oil tankers inputted from the navigation status monitor 24. In addition to the current position, destination, port of call, scheduled date of entry, etc., the next scheduled transportation plan (tonnage of transport of crude oil and naphtha, port of call (buy point of crude oil and naphtha), destination and schedule), etc. ) Is remembered.

The processing unit 26 calculates a crude oil tanker and a refined oil tanker that can be transported according to the transportation plan, based on the navigation situation stored in the database 25. And the quantity of naphtha which can be mixed is calculated | required from the calculated transportation capacity of the crude oil tanker and the quantity of the crude oil conveyed by the said transportation plan.

Subsequently, the processing unit 26 calculates the total transportation cost of the crude oil and naphtha in this transportation plan by calculation, taking into account the purchase destination of the crude oil and the naphtha shown in the transportation plan. Increase or decrease the quantity, and determine how much naphtha is mixed in which crude oil tanker will give the lowest total transportation cost.

In this way, the crude oil tanker which mixes naphtha is determined, and the port of call, schedule, etc. of each crude oil tanker and refined oil tanker are determined, and it outputs to the output part 27, such as a display.

When the crude oil tanker which mixes naphtha is determined in the above procedure, the inboard tank which loads a naphtha is specified among the some inboard tanks provided in the said crude oil tanker based on the quantity of naphtha mixed next (step S2).

3 is a schematic plan view of an extra-large crude oil tanker such as VLCC mixed with naphtha.

The crude oil tanker 1 is provided with a plurality of inboard tanks 11. The naphtha 3 and the crude oil 2 have different densities (or specific gravity, described in terms of density in the following description). Thus, when the naphtha 3 and the crude oil 2 are mixed and transported, the crude oil tanker It is necessary to load the naphtha 3 in a balanced manner so as not to interfere with the navigation in (1).

FIG. 3 shows a case where naphtha is loaded into five of the plurality of inboard tanks 11. In the figure, the inboard tank 11 on which naphtha is loaded is indicated by reference numeral N, and the onboard tank 11 on which crude oil is loaded is indicated by reference numeral O. In FIG. In addition, WBT is a ballast tank.

As shown in the drawing, the inboard tank 11 for loading naphtha and the inboard tank 11 for loading crude oil are placed in the traveling direction of the crude oil tanker 1 so that the center position of the crude oil tanker 1 does not move as much as possible. Has been specified in a balanced way from side to side and back and forth. In addition, inboard tanks which may be designated for naphtha stacking may be replaced beforehand by packing such as nitrile-budadiene rubber (NBR) having a low corrosiveness caused by naphtha.

In addition, when loading naphtha, it is necessary to extract the crude oil which remains in the ship's piping of a crude oil tanker 1 from a drain, but the inboard tank 11 to which the said drain is connected shall be used only for crude oil, What is necessary is to remove from the designation of the inboard tank 11 which loads a naphtha previously.

If an inboard tank on which naphtha is loaded is designated, the level gauge provided in the inboard tank is corrected in consideration of the difference in density between the naphtha and crude oil (step S3).

In addition, the inside of the inboard tank in which the naphtha is loaded is cleaned to remove the remaining crude oil or sludge from the inboard tank as much as possible (step S4).

Although internal cleaning of this inboard tank can also use exclusive detergent, seawater, etc., it is good to carry out using the crude oil conveyed at the time of the last voyage. Crude oil remains on the inner wall of the inboard tank, but the amount is very small relative to the amount of naphtha loaded in the inboard tank, and the amount of crude oil mixed into the naphtha (raw naphtha) can be sufficiently below the allowable level. . In addition, the amount of crude oil mixed into the naphtha can be reduced by extracting the remaining crude oil before loading the naphtha.

The loading of naphtha may be after or after loading crude oil. Before loading the naphtha, it is preferable to again extract crude oil and sludge remaining in the bottom of the inboard tank (step S5). By doing in this way, the quantity of the crude oil mixed in naphtha can further be reduced.

In order to prevent the mixing of crude oil into naphtha as much as possible, when loading naphtha, the crude oil remaining in the ship's piping on the crude oil tanker is extracted into an inboard tank where crude oil is loaded (or already loaded). (Step S5).

According to the above procedure, the naphtha is ready for loading, and then the naphtha is loaded into the designated inboard tank (step S6).

At this time, in order to further reduce the amount of crude oil mixed into the naphtha, the naphtha is loaded at a relatively slow speed at the beginning of naphtha loading, and the crude oil or sludge remaining at the bottom of the inboard tank is not stirred. Do it.

In addition, by slowly loading the naphtha at the beginning of the loading start, the generation of static electricity due to the friction between the naphtha and the inboard tank can be extremely suppressed, and it is also effective for safety reasons.

The naphtha is loaded in this order. After the naphtha is loaded, it is preferable that the naphtha remaining in the pipe is extracted to the inboard tank in which the naphtha is loaded, so that the deduction is prevented as much as possible.

The naphtha and crude oil loaded by the said procedure are conveyed to the destination by the common crude oil tanker (step S7). In addition, when the pressure of an inboard tank rises at the time of navigation, it is good to spray on a deck and to cool an inboard tank. Thereby, the defect by the naptha vaporization * can be prevented.

At the destination, either naphtha or crude oil may be lowered first. If the naphtha was loaded after the crude oil was loaded at the time of loading, it is preferable to lower the naphtha first. In this way, the operation of removing crude oil from the ship's piping can be omitted, and the amount of crude oil mixed into the naphtha can also be reduced. When unloading the naphtha, the main ship extraction device is used to completely discharge the naphtha from the tank on board.

If crude oil is loaded after naphtha is loaded at the time of loading, the crude oil may be unloaded first. Then, the crude oil in the pipe is extracted in the same procedure as before (step S8), the naphtha is filled with the pipe, and the naphtha is lowered (step S9).

In addition, the naphtha may be slowly lowered in the vicinity of the bottom of the inboard tank so as not to stir crude oil or sludge remaining in the inboard tank even during unloading. After the naphtha is lowered, it is preferable to perform an antirust treatment of the inboard tank by washing the inboard tank with crude oil.

If land piping connected to the ship's piping (including land piping, including the offshore piping extending from the land to the city bus) is divided into naphtha and crude oil, use naphtha-based land piping. It is good to lower naphtha and to lower crude oil using the said land piping exclusively for crude oil.

According to the present invention, since naphtha can be transported using a crude oil tanker having a low transportation cost, there is an effect that the transportation cost of naphtha can be greatly reduced.

The specific effect of this invention is shown in the following table | surface.

This table shows the reduction of transportation cost when the naphtha 50,000 tons and crude oil were mixed and transported to VLCC which is a very large crude oil tanker. Transportation costs per tonne in 2001 were about $ 20 for crude oil tankers and about $ 31 for refined oil tankers dedicated to naphtha.

Unit price ＄ / t Transport tonnage Transportation cost VLCC ＄ 20 50,000 t ＄ 1 million Refined Oil Tanker ＄ 31 50,000 t ＄ 1.45 million difference ＄ 11 ＄ 550,000

Thus, according to this invention, the transportation cost of about $ 550,000 (71.5 million yen in conversion of $ 1 = 130 yen) can be reduced by one transportation. This indicates that the transportation cost of naphtha can be reduced to about 2/3 of the conventional one. Therefore, according to this invention, cost reduction of the raw material naphtha which was difficult conventionally can be achieved easily and largely.

In addition, when the characteristics of the raw material naphtha or product naphtha were examined after discharge, a slight discoloration was recognized, but the amount of crude oil contained was very small, well below the allowable limits set by laws regulating the operation of the device and other laws. .

[Description of Transfer Method]

By the way, when the land piping is not distinguished for naphtha and crude oil, it is possible to lower the naphtha using the onshore piping for crude oil.

In this case, the naphtha 3 may be transferred using techniques known to, for example, Japanese Patent Application Laid-Open No. 2001-108200, Japanese Patent Application Laid-Open No. 95-83399, Japanese Patent Application No. 82-25760, and the like. Do.

In the present embodiment, crude oil and naphtha are transferred using a common land pipe by the following method described with reference to FIGS. 4 to 10 while minimizing the amount of mixed crude oil.

Fig. 4 shows a schematic block diagram for explaining the transfer situation in the embodiment of the crude oil and naphtha transfer method of the present invention.

4 omits bypass piping and the like for easy understanding.

In FIG. 4, the large tanker 1 is equipped with the several inboard tank 11 as a transport tank, and is loaded in different inboard tank 11 so that crude oil 2 and naphtha 3 may not mix. We are anchored in city bus which is transportation place.

In addition, the large tanker 1 is usually provided with a pump 12 for transferring the loaded crude oil 2 to the onshore crude oil tank 4, and the city bus crude oil discharged from the pump 12 ( 2) The valve 51 for conveying, the pressure gauge 52, and one piping 53 are provided. Moreover, the density meter 54 is provided as needed.

In addition, a plurality of crude oil tanks 4 and naphtha tanks 6 are provided on land as a storage tank, and the valve 61 is provided at the tip of the pipe 53 provided up to the vicinity of the tanks 4 and 6. Is connected via).

5 is a schematic flowchart of an embodiment of a method for transferring crude oil and naphtha of the present invention, and specifically discloses an example of transferring crude oil after transferring naphtha.

According to the method for transferring crude oil and naphtha according to the present embodiment, the crude oil 2 and the naphtha 3 are fed by one pipe 53, and the crude oil 2 is discharged from the inboard tank 11 to each tank 4, In the case of transfer to 6), first, the pipe 53 is connected to the crude oil tank 4 (step S11).

At this time, since the crude oil 2 stays in the piping 53, in order to transfer the naphtha 3 to the naphtha tank 6, the naphtha 3 is sent out to the piping 53, and this pumping is carried out. By the action, it is necessary to extrude the crude oil 2 in the pipe 53 to the crude oil tank 4.

Next, the quantity of the crude oil 2 which stays in the piping 53 which connects the inboard tank 11 and each tank 4 and 6 is calculated beforehand (step S12).

Here, the crude oil 2 in the pipe 53 is usually stored in a substantially full state in the pipe 53 in which the valves 51 and 61 are closed. In this case, the volume of the crude oil 2 is converted into the volume of the crude oil 2. It can calculate as (quantity).

Subsequently, at the start of delivery, the valves 51 and 61 are opened, the naphtha 3 is discharged from the inboard tank 11, and the discharge amount of the naphtha 3 is measured (step S13).

This metering can be performed, for example, by using a flowmeter connected to the pipe 53, measuring the height of the liquid level of the inboard tank 11, or measuring the height of the liquid level of the tank 4 serving as a storage place.

Next, when the delivery amount of the naphtha 3 from the inboard tank 11 becomes the same quantity as the quantity of the crude oil 2 which stayed beforehand, the delivery of the naphtha 3 from the inboard tank 11 is performed. It stops and switches the tank which is a storage place from the crude oil tank 4 to the naphtha tank 6 (step S14).

The reason why the amount is almost the same is that the allowable mixing amount of the crude oil 2 into the naphtha 3 changes depending on the ratio of the heavy compounds contained in the crude oil 2, the total transfer amount of the naphtha 3, and the like.

Next, after switching the tank which is a storage place from the tank 4 for crude oil to the tank 6 for naphtha, the delivery of the naphtha 3 from the inboard tank 11 is resumed, and the naphtha 3 is used for naphtha. It stores in the tank 6 (step S15).

In addition, when the naphtha 3 is transferred from the inboard tank 11, the pump 12 of the large tanker 1 is stopped.

As described above, according to the method for transferring the crude oil and the naphtha according to the present embodiment, the crude oil 2 remaining in the pipe 53 is discharged to the crude oil tank 4 by a pumping action by sending out the naphtha 3. Therefore, the amount of mixing of the crude oil 2 into the naphtha 3 can be effectively reduced.

In addition, since a special separating agent for separating the naphtha 3 and the crude oil 2 may not be used, the transfer process can be simplified.

Subsequently, the crude oil 2 of the inboard tank 11 of the large tanker 1 is transferred to the crude oil tank 4.

In this case, since the naphtha 3 stays in the piping 53, it is necessary to extrude the naphtha 3 in the piping 53 to the tank 6 for naphtha.

Therefore, the piping 53 is connected to the naphtha tank 6 (step S16).

Then, the quantity of the naphtha 3 which stays in the piping 53 which connects the inboard tank 11 and each tank 4 and 6 is calculated beforehand (step S17).

Next, the crude oil 2 is sent out from the inboard tank 11, the amount of the crude oil 2 is measured (step S18), and the amount of the crude oil 2 sent from the inboard tank 11 is calculated in advance. When the amount is almost equal to the amount of the naphtha 3 staying, the delivery of crude oil 2 from the inboard tank 11 is stopped, and the tank serving as a storage place is removed from the naphtha tank 6. 4) (Step S19).

After switching the tank which is a storage place from the tank 6 for naphtha to the tank 4 for crude oil, delivery of the crude oil 2 from the inboard tank 11 is resumed, and the crude oil 2 is returned to the tank 4 for crude oil. ) In step S20.

In addition, after the crude oil 2 is transferred from the inboard tank 11, the pump 12 is stopped and the valves 51 and 61 are closed. Therefore, the crude oil 2 stays in the pipe 53.

In this way, since the naphtha 3 which stayed in the piping 53 can be extruded into the naphtha tank 6 by a pumping action by sending crude oil 2, the crude oil 2 of the naphtha 3 is carried out. Can be effectively reduced.

In addition, although this embodiment becomes the transfer method of the crude oil and naphtha in the case of first lowering naphtha 3 from the large tanker 1, and then lowering crude oil 2, it does not specifically limit about the order of unloading. It can also be executed in the order of the above and reverse (lower naphtha after lowering crude oil). The determination of this procedure is carried out in consideration of the situation of loading (crude oil only or crude oil / naphtha) of the tanker to drop.

In the method for transferring crude oil and naphtha according to the present embodiment, for example, when the amount of crude oil 2 remaining in the pipe 53 is calculated in advance (step S12), the temperature, density, etc. of the crude oil 2 remaining. Is preferably at least a correction element.

In this way, when the amount of delivery of the naphtha 3 from the inboard tank 11 is calculated | required from the quantity of the crude oil 2 measured using the chuck | zipper 42 of the crude oil tank 4 of a storage place, Since the measurement error due to the temperature difference and the density difference with the crude oil 2 already stored in the useful tank 4 can be corrected, the timing of switching from the crude oil tank 4 to the naphtha tank 6 is further improved. It can obtain with good precision.

In this embodiment, the said density can be measured by the density meter 54 attached to the pump 12 side of the piping 53.

Similarly, when calculating the amount of the naphtha 3 staying in the pipe 53 in advance (step S17), it is a matter of course that the temperature, density, etc. of the naphtha 3 may be used as a correction element as mentioned above.

In addition, at the time of measuring the discharge amount of the naphtha 3 (step S13), the discharge amount of the naphtha 3 from the inboard tank 11 is measured using the branch 42 of the crude oil tank 4 which is a storage place. In this way, the amount of discharge of the naphtha 3 from the inboard tank 11 can be measured simply and reliably, and the tank serving as the storage place is transferred from the crude oil tank 4 to the naphtha tank 6. The timing to switch can be calculated | required with favorable precision.

Similarly, when the delivery amount of the crude oil 2 is measured (step S18), the delivery amount of the crude oil 2 from the inboard tank 11 is measured using the guide 62 of the naphtha tank 6 as a storage place. Of course you can.

By the way, since this invention does not use the special separation agent etc. which isolate | separate naphtha (3) and crude oil (2), the boundary between naphtha (3) and crude oil (2) is naphtha (3) and crude oil (2). ) Becomes a mixed fluid 7 mixed with each other.

Since the mixed fluid 7 is formed in the pipe 53 by a distance determined by various conditions, the mixing of the crude oil 2 into the naphtha 3 is prevented or the crude oil 2 into the naphtha 3 is prevented. In order to control the mixing amount, it is necessary to know the state of the mixed fluid 7 corresponding to the delivery amount of the naphtha 3 or the crude oil 2.

FIG. 6 is a schematic view for explaining the mixed fluid in the pipe according to the embodiment of the present invention, and FIG. 6A is a cross-sectional view of a state where naphtha is sent to a pipe where crude oil is retained, and FIG. 6B is a naphtha. The cross section of the state which sent crude oil to the piping currently shown is shown.

In FIG. 6A, when the naphtha 3 is sent to the pipe 53 in which the crude oil 2 stays, a mixed fluid 7 of a distance L1 is formed in the pipe 53, and the mixed fluid 7 Distance L1 depends on the length of the pipe (see FIG. 10).

In addition, the concentration curve shows the ratio of naphtha 3 to crude oil 2 in the cross section of the pipe 53, and the naphtha ratio increases as much as the front end side of the mixed fluid 7, and the naphtha ratio as the rear end side. Lowers.

In addition, in FIG. 6B, when the crude oil 2 is sent to the piping 53 in which the naphtha 3 stays, the mixed fluid 7 of distance L2 is formed in the piping 53, and the mixed fluid ( The distance L2 of 7) likewise depends on the length of the pipe.

In addition, the concentration curve shows the ratio of crude oil 2 to naphtha 3 in the cross section of the pipe 53, and the crude oil ratio is lowered by the front end side of the mixed fluid 7, and the crude oil ratio is increased by the rear end side. Increases.

Here, in order to minimize the mixing of the crude oil 2 and the naphtha 3, it is necessary to execute the flow rate control of the naphtha 3 or crude oil 2 to be sent out and the control of switching of the storage tank with good accuracy.

That is, the naphtha 3 and the crude oil are shortened as the distance in the piping 53 of the mixed fluid 7 is shortened by executing the flow rate control (control of the delivery speed) of the naphtha 3 to be sent or the crude oil 2. The mixing amount of (2) can be reduced.

In addition, since the switching control of the storage tank, that is, the control at which timing the naphtha 3 or the crude oil 2 is stopped, cannot directly observe the state of the mixed fluid 7 being transferred, It is preferable to analyze the flow state of the crude oil 2, the naphtha 3, and the mixed fluid 7 in (53), and to use this flow analysis result. In this way, it is possible to control the mixing amount of the crude oil 2 into the naphtha 3 with good accuracy, and the naphtha 3 is mixed with the heavy compound more than a certain ratio, and the naphtha 3 is contaminated with the heavy compound. You can prevent it.

The flow analysis is based on the continuous equation (1), the momentum equation (2), the turbulence model equation (3) and the diffusion equation (4) shown in Fig. 7, and the crude oil (2), naphtha (3) and The flow state of the mixed fluid 7 is analyzed.

In FIG. 7, concentration distribution in the piping 53 can be calculated from the continuous equation (1), the momentum equation (2), and the diffusion equation (4).

And the flow state of the mixed fluid 7 is analyzed, and the timing which stops delivery of the naphtha 3 or the crude oil 2 from the inboard tank 11 is determined using this flow analysis result. In this way, since the naphtha ratio or the crude oil ratio in arbitrary positions of the piping 53 can be calculated | required, for example, even when a part of the mixed fluid 7 is extruded to the tanks 4 and 6, piping ( The crude oil amount or naphtha amount of the mixed fluid 7 in 53 can be calculated with good accuracy.

Moreover, the naphtha 3 or the crude oil 2 is sent out when the crude oil 2 or naphtha 3 remaining in the pipe 53 is fed into the crude oil tank 4 or the naphtha tank 6. By changing the speed and simulating the flow state of the mixed fluid 7, the delivery speed of the naphtha 3 or the crude oil 2 which can shorten the distance Ll and L2 of the mixed fluid 7 can be selected. The feed of the crude oil 2 into the naphtha 3 can be conveyed in a state of being kept to a minimum.

Next, the crude oil 2 and the naphtha 3 are transferred from the inboard tank 11 to the land source using the pipe 53 filled with the crude oil 2 using the crude oil and naphtha transfer method of the present embodiment. The analysis example transferred to the useful tank 4 and the naphtha tank 6 is demonstrated with reference to drawings.

(Example of interpretation)

FIG. 8 is a schematic view for explaining an example of an analysis of the flow state of the present embodiment, FIG. 8A shows an analysis model, and FIG. 8B shows a graph showing a change in delivery speed (flow rate).

In FIG. 8A, the pipe 53 has an internal diameter of about 1.2 m and a length of about 9 km, and the crude oil 2 is retained and is not shown, but the naphtha (from the pump 12 of the large tanker 1) is not shown. 3) is sent out.

In addition, in FIG. 8B, the delivery speed of the naphtha 3 increases the flow rate almost in proportion to the normal time, and as shown in the normal delivery curve, at a predetermined delivery speed (for example, about 4800kl / hr). As soon as possible, the transfer is continued at this predetermined feeding speed, and before the transfer is stopped, the flow rate is similarly reduced in proportion to time to stop the transfer.

In contrast, in the method for transferring crude oil and naphtha of the present invention, the delivery speed of the naphtha 3 immediately after the start of delivery is rapidly raised to the predetermined delivery speed.

In this way, the delivery speed is increased rapidly from immediately after the start of delivery of the naphtha 3, and the turbulent state can be minimized as early as possible, thereby minimizing the distance of the mixed fluid 7.

That is, by simulating the flow state of the mixed fluid 7, the delivery speed of the naphtha 3 or the crude oil 2 is changed immediately after the delivery start, and the naphtha 3 and the crude oil 2 mixed in the piping 53 are mixed. The length of the fluid 7 can be shortened, and the mixing of the naphtha 3 and the crude oil 2 in the piping 53 can be suppressed to the minimum.

The crude oil remaining in the piping 53 is based on the flow analysis of the crude oil 2, the naphtha 3, and the mixed fluid 7 composed of the crude oil 2 and the naphtha 3 in the piping 53. (2) or the method of changing the delivery speed of the naphtha 3 or the crude oil 2 at the time of extruding the naphtha 3 to the tanks 4 and 6 is not limited to the said delivery speed change, For example, , Depending on the piping installation conditions.

Moreover, the delivery speed of the naphtha 3 or the crude oil 2 can also be changed just before a delivery stop, and if it does so, the tank which is a storage place may be moved from the crude oil tank 4 or the naphtha tank 6 to the naphtha tank. (6) or the timing to switch to the tank 4 for crude oil can be calculated | required with better precision, and it can prevent that the crude oil 2 mixes with the naphtha 3 more reliably.

FIG. 9 is a graph showing a transfer amount with respect to a transfer time for explaining a transfer state of crude oil and naphtha in the analysis example of the present embodiment.

First, the situation of this analysis example is demonstrated along the flowchart shown in FIG.

The large tanker 1 is a 300,000-ton tanker, and is loaded in the plurality of inboard tanks 11 so as to not mix about 230,000 KL of crude oil and about 70,000 KL of naphtha.

Moreover, the crude oil 2 stays in the piping 53 before a transfer start.

When the naphtha 3 is fed from the inboard tank 11 to the naphtha tank 6 using the pipe 53 in which the crude oil 2 is retained, the pipe 53 is connected to the crude oil tank 4. (Step S11).

Next, the quantity of the crude oil 2 which stays in the piping 53 which connects the inboard tank 11 and the crude oil tank 4 is calculated beforehand (step S12).

In the large tanker 1 anchored in the city bus, the inboard tank 11 in which the naphtha 3 is loaded is connected to the pump 12 installed in the large tanker 1, and the pump 12 is connected to the pipe 53. In order to extrude the retained crude oil 2 into the crude oil tank 4, the naphtha 3 is sent from the inboard tank 11 to the pipe 53. Then, the delivery amount of the crude oil 2 is measured using the chuck 42 of the crude oil tank 4 (step S13).

Here, the naphtha 3 is sent out by the delivery curve shown to FIG. 8B based on the said analysis result.

10 is a graph of concentration curves for explaining a naphtha concentration distribution in the pipe longitudinal direction in an analysis example of the present embodiment.

In Fig. 10, each of the concentration curves A, B, and C is a naphtha concentration curve at each pipe length. For example, the concentration curve A is present at a pipe length of about 2350 m to about 2650 m after about 0.6 hours from the start of delivery. The concentration curve of the naphtha of the mixed fluid 7 is shown.

That is, when the naphtha 3 is sent out in the delivery curve, only the crude oil 2 exists in the pipe 53 ahead of the pipe length of about 2650 m and the crude oil (in the pipe 53 of the pipe length of about 2650 m to about 2350 m). 2) and the naphtha 3 exist according to the concentration curve A, and only the naphtha 3 exists in the piping 53 just before the pipe length of about 2350m.

In addition, the mixed fluid 7 has a length of about 300 m in the pipe 53, and the naphtha ratio in the center part (that is, the position of the pipe length of about 2500 m) is about 40 vol%.

In this way, the naphtha ratio is not about 50 vol% at the central portion of the mixed fluid 7 because the density of the naphtha 3 is lower than that of the crude oil 2, and the density of the crude oil 2 and the naphtha 3 is good accuracy. By measuring with, the flow analysis in the pipe 53 can be made to a high precision.

In addition, the mixed fluid 7 becomes longer as it is conveyed in the pipe 53, and, for example, about 1.2 hours after the start of dispensing, as shown in the concentration curve B, the front end of the mixed fluid 7 is weak. When it is 5225 m, the rear end is about 4775 m, and the mixed fluid 7 has a length of about 450 m in the pipe 53.

Further, for example, about 2.4 hours after the start of delivery, as shown in the concentration curve (C), when the front end of the mixed fluid 7 is about 9365 m, the rear end is about 8635 m, and the mixed fluid 7 The pipe 53 has a length of about 730 m.

In this way, if the concentration curve when the tip of the mixed fluid 7 reaches the pipe 53 is reached, the amount of crude oil in the mixed fluid 7 can be calculated with good accuracy. Accordingly, when the crude oil amount obtained by subtracting the crude oil amount in the mixed fluid 7 from the crude oil amount remaining in the pipe 53 is extruded into the crude oil tank 4, the tip of the mixed fluid 7 is at the end of the pipe 53. You can see that you have reached it.

That is, it is possible to know whether the tip of the mixed fluid 7 reaches the end of the pipe 53 or how many seconds later, and even when the tip of the mixed fluid 7 is extruded into the crude oil tank 4, The length and concentration curves of the mixed fluid 7 remaining in the pipe 53 can be obtained from the flow analysis results, and since the amount of crude oil to be mixed can be calculated with good accuracy, the amount of crude oil mixed into the naphtha 3 is extremely good. The crude oil 2 remaining in the pipe 53 can be extruded in a controlled state.

In order to minimize the mixing of the crude oil 2 into the naphtha 3 of the naphtha tank 6 and to minimize the naphtha 3 conveyed to the crude oil tank 4, the rear end of the mixed fluid 7 It is good to stop the feeding of the naphtha 3 in the state which passed this piping 53.

Moreover, when the crude oil amount which can be mixed into the naphtha 3 is set, since the delivery stop position of the mixed fluid 7 can be calculated according to the crude oil amount mixed from a concentration curve, the crude oil 2 to the naphtha 3 is carried out. Can be controlled with good accuracy.

Next, when the delivery amount of the naphtha 3 from the inboard tank 11 is about the same quantity as the quantity of the crude oil 2 which stayed beforehand, the delivery of the naphtha 3 from the inboard tank 11 is carried out. The tank, which is a storage place, is switched from the crude oil tank 4 to the naphtha tank 6 (step S14).

And after switching the tank which is a storage place from the tank 4 for crude oil to the tank 6 for naphtha, the delivery of the naphtha 3 from the inboard tank 11 is resumed, and the naphtha 3 is returned to the tank for naphtha. (6) (step S15).

Next, the crude oil 2 must be transferred. However, at this stage, the naphtha 3 stays in the pipe 53.

Accordingly, as the crude oil 2 remaining in the pipe 53 is extruded into the naphtha 3, the naphtha 3 remaining in the pipe 53 is converted into the crude oil 2. Extrude).

In addition, after this, it can implement similarly to the said case.

That is, in order not to mix crude oil 2 in the naphtha 3 of the naphtha tank 6 at all, and to maximize the naphtha 3 conveyed to the naphtha tank 6, the front end of the mixed fluid 7 is carried out. In the state where the end of the pipe 53 is reached, the delivery of the crude oil 2 may be stopped, and when the crude oil amount that can be mixed into the naphtha 3 is set, the mixed fluid 7 according to the crude oil amount mixed from the concentration curve. What is necessary is just to calculate the delivery stop position of and to stop the delivery of the crude oil 2 so that the mixed fluid 7 may stop at this stop position.

In the present invention, the calculation of the crude oil and the like remaining in the pipe, the comparison between the calculated crude oil amount and the measured crude oil amount, flow analysis of the mixed fluid, and the like are performed by a control device (not shown).

Moreover, a control apparatus can also be set as the structure which automatically controls opening and closing of the pump 12 and the valves 51 and 61 using the flow analysis result. In this way, the amount of mixing of the crude oil 2 into the naphtha 3 can be controlled with better accuracy.

When the valves 51 and 61 are manual, the worker opens and closes the valve based on the instruction of the control device.

In addition, the quantity of the crude oil 2 or naphtha 3 extruded is measured by the branch chuck 42 or the branch chuck 62, and the naphtha 3 or the crude oil 2 sent out from the inboard tank 11 from the measurement result. In calculating the quantity of), the flow state of the mixed fluid 7 can be known by inputting a measurement result to a control apparatus every predetermined time.

Here, with respect to the timing of inputting the weighing result to the control device, for example, each time the catch quantity is increased from about 5000kl before to about 1000kl, the weighing result is input to the control device, and the catch quantity is from about 1000kl before. Each time about 200 kl is increased, the metering result may be input to the control device, whereby the flow state of the mixed fluid 7 can be known with better accuracy.

Although preferred embodiment of this invention was described, this invention is not limited by the said embodiment.

For example, the present invention is not limited to the VLCC, but is applicable to a crude oil tanker ULCC larger than the VLCC and a crude oil tanker smaller than the VLCC.

According to the naphtha transportation method of the present invention, since naphtha can be transported using a crude oil tanker having a low transportation cost, the transportation cost of naphtha can be greatly reduced, and the cost of naphtha can be reduced.

According to the method for transferring crude oil and naphtha according to the present invention, the crude oil and naphtha lots are loaded together in the crude oil tanker, the crude oil pipes are shared from the city bus, and the crude oil and naphtha are minimized. Each tank can be taken separately.

That is, even if naphtha is transferred from the crude oil tanker which transported the naphtha to the crude oil piping to the onshore tank, the mixing of the crude oil into the naphtha (contamination of naphtha) can be suppressed below the level which can be used as a raw material naphtha.

According to the method for transferring crude oil and naphtha according to the present invention, crude oil and naphtha are loaded in a state in which a crude oil lot and a naphtha lot are loaded together in a crude oil tanker, and a crude oil pipe is shared from a city bus to minimize the mixing of crude oil and naphtha. Can be collected separately in each tank. In other words, even if naphtha is transferred from the crude oil tank which has transported the naphtha to the crude oil pipe to the onshore tank, the mixing of naphtha of the crude oil (contamination of naphtha) can be suppressed below the level that can be used as the raw material naphtha.

Claims (14)

In the method of transporting naphtha using a transporter for transporting crude oil, Designate at least a portion of the plurality of vehicle tanks installed in the vehicle for naphtha stacking, The inside of the carrier tank for naphtha loading is cleaned in advance before naphtha loading, When the naphtha is loaded or unloaded, crude oil is extracted from at least the inside of the pipe on the vehicle, and the naphtha is loaded or unloaded. Method of transporting naphtha by a vehicle. The method of claim 1, Characterized in that the inside of the transport tank for loading the naphtha is washed with crude oil Method of transporting naphtha by a vehicle. The method according to claim 1 or 2, Characterized in that the vehicle is a very large crude oil tanker exceeding 150,000 tons Method of transporting naphtha by a vehicle. The method according to any one of claims 1 to 3, It is isolated from the said carrier tank to which the drain for extracting crude oil in the said piping is connected, and it designates the carrier tank for naphtha loading. Method of transporting naphtha by a vehicle. The method according to any one of claims 1 to 4, When the naphtha is loaded, the naphtha is slowly loaded at a speed not to stir the crude oil residue remaining in the bottom portion of the transport tank at the beginning immediately after the loading start. Method of transporting naphtha by a vehicle. The method according to any one of claims 1 to 5, When the naphtha is unloaded, the naphtha is lowered at a speed that does not stir the crude oil residue remaining at the bottom of the vehicle tank. Method of transporting naphtha by a vehicle. The method according to claim 1 to 6, The carrier tank for loading the naphtha so as to determine the number of the carrier tanks to be used according to the loading amount of the naphtha and to suppress the movement of the center of the carrier due to the difference in density or specific gravity of crude oil and naphtha. Characterized in that Method of transporting naphtha by a vehicle. In the method of transporting crude oil and naphtha to a common transporter and transferring crude oil and naphtha from a transport tank to a storage tank by one piping, (1) When naphtha or crude oil is fed from the carrier tank to the storage tank using the pipe, the pipe is connected to a tank for crude oil or naphtha, (2) the amount of crude oil or naphtha remaining in the pipe connecting the vehicle tank and the storage tank is calculated in advance; (3) discharging naphtha or crude oil from the vehicle tank, and measuring the amount of dispensing; (4) When the amount of naphtha or crude oil discharged from the carrier tank is about the same as the amount of crude oil or naphtha remaining in the pipe calculated in advance, the discharge of naphtha or crude oil from the vehicle tank is stopped. Converts the tank, which is a storage place, from a tank for crude oil or naphtha to a tank for naphtha or crude oil, (5) The method for transferring crude oil and naphtha after switching the tank, resuming naphtha or crude oil delivery from the carrier tank and storing the naphtha or crude oil in a naphtha or crude oil tank. The method of claim 8, A flow analysis of the crude oil, naphtha and the mixed fluid consisting of crude oil and naphtha in the pipe is executed, and the timing of stopping the delivery of naphtha or crude oil from the carrier tank is determined using the flow analysis result. By How to transfer crude oil and naphtha. The method according to claim 8 or 9, When calculating the amount of crude oil or naphtha remaining in the pipe in advance, the temperature, density or specific gravity of the crude oil or naphtha staying is at least a correction factor. How to transfer crude oil and naphtha. The method according to any one of claims 8 to 10, The amount of naphtha or crude oil discharged from the vehicle tank is measured by using the chuck of the tank serving as the storage place. How to transfer crude oil and naphtha. The method according to any one of claims 8 to 11, A delivery speed of naphtha or crude oil when the crude oil or naphtha remaining in the pipe is extruded into a tank is changed based on the flow analysis result. How to transfer crude oil and naphtha. The method of claim 12, Immediately after the start of delivery of the naphtha or crude oil and immediately before the delivery stop, the delivery speed of the naphtha or crude oil is changed. How to transfer crude oil and naphtha. The method of claim 13, The rate of supply of the naphtha or crude oil immediately after the start of delivery of the naphtha or crude oil is rapidly increased to a predetermined delivery rate. How to transfer crude oil and naphtha.