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Advantages of Mass Flow Meters in Oil Terminal Handover System

Advantages of Mass Flow Meters in Oil Terminal Handover System

Issue Time:2020-05-08

Petroleum is an important energy resource, which plays an important role in the social life and production. As an important place for storage and transfer of refined oil, oil depot is a very important link in the whole refined oil supply system. At present, the Volumetric Flow Meters is still the main solution in the loading process of oil terminal in China, and the oil terminal oil depot need to use different fuel delivery methods according to different customers. The internal gas station transportation is generally based on V20 and ρ20, and the delivery outside the station is generally settled by quality. This brings great trouble to the calculation of various data in the oil depot, such as cumbersome operations and large errors, etc., and the mass flow meter can perfectly achieve the arbitrary conversion of quality and V20, saving timeeffort and costs.


Do you encounter the following problems:

1. Large workload, low accuracy, and large loss when measuring how much oil in storage

2. The oil density measurement is troublesome, the workload is large and unsafe;

3. Both Mass Flow Meters and V20 are required, while the Volumetric Flow Meters can only measure the volume, so the mass needs to be converted.


The reasons are as bellow:

1.The oil terminal disk storage is settled by quality, but most of the oil in the oil terminal is a Volumetric Flow Meters. The volume accuracy is 2. It needs to be matched with density and temperature to be converted into quality. Due to the accumulation of errors, the quality accuracy cannot meet the requirements, the workload is also large, and the Volumetric Flow Meters needs to be replaced or maintained every six months to one year;


2.
The volumetric flow meter cannot measure the density. The density of the oil product needs to be measured manually by the tanker truck or a special density meter is installed. The measurement of the tanker truck is not traceable and does not meet the safety regulations. And the bottom loading is not allowed to open the cover sampling, because it would pollute the environment and doesn’t meet the requirements of relevant national environmental protection documents, and the cost of separately equipped with a density meter is higher.

A Mass Flow Meter can solve the above troubles:
The Coriolis principle Mass Flow Meter can directly measure the mass flow of the fluid in the pipeline, greatly reduce the cost of the oil terminal, perfectly solve the existing oil generation problem, and add a high-precision online density measurement function through density calibration (The accuracy of density measurement is better than ± 0.0005g / cm³), which can realize multi-use of one machine:

1.Solve the digital quality inventory of outbound and inbound

2.Internal distribution real-time output high precision V20,ρ20
3.External delivery realizes quality trade transfer
Data comparison between mass flow meter and existing measurement methods

Item

Existing measurement model

New method

Volumetric Flow Meter

Density Measurement

Thermometer

Add Value Mass Flow Meter

V20

Error is 0.2%

/

/

Error is 0.15%

Real-time temperature

/

/

Error is±0.5

Error is±0.2

ρ20

/

Manual measurement needs to open the cover which will cause air pollution and time-consuming and laborious, the error is±0.001g/ cm³

/

Direct measurement, the error is±0.0005g/ cm³

Mass

Through volume, density and temperature conversion, the error is ±0.3%

Direct measurement, the error is±0.1%

Cost

They need to be maintained every six months.

Lifetime is over 10 years

The followings are photos and data records of the application of Mass Flowmeter in a Sinopec oil terminal to achieve mass and V20 oil delivery.

Oil terminal Flowmeter calibration record

Variety

Flow Meter Terminates Reading

(L)

Flow Meter Mass

(Kg)

Standard Density

(Kg/m³)

Standard density measured manually

(Kg/m³)

Density Error

(‰)

Standard Tank Oil Temperature

Tb

Flow Meter Measures Temperature

Ta

Temperature Error

(Ta-Tb)

Standard Tank Real Volume

(L)

Volume Error

(‰)

Actual Mass

(Kg)

Mass Error

(‰)

92#

1996.4

1473.4

741.5

741.1

0.4

23.6

24.2

0.6

1997.8

-0.7

1471.7

1.2

92#

2002

1476

741.5

741.2

0.3

26.4

26.2

-0.2

2003.7

-0.8

1474.8

0.8

92#

1994

1465.5

741.6

741.2

0.4

27.6

27.8

0.2

1995.5

-0.8

1463.6

1.3

92#

2003

1471

741.6

741.3

0.3

28.1

27.8

-0.3

2005

-1

1470.5

0.3

95#

2004.1

1485.5

748.7

749

-0.3

28.1

28

-0.1

2007.7

-1.8

1486.1

-0.6

95#

1996

1482

748.6

748.5

0.1

27.2

26.9

-0.3

1997.1

-1

1480.3

1.1

According to the data, it can be seen that the volume error of Mass Flowmeter is within ± 0.2%, the density error is within ± 0.0005g / cm³, and the mass error is within ± 0.15%. Both mass and V20 can be transferred at the same time, and it can replace the manual measurement of density. 


Benefit

1. A high-precision Mass Flow Meter can replace the functions of existing measuring instruments (Volumetric Flow Meters, Density Meter, Thermometer), which greatly reduces the cost of equipment;

 

2. The data can be concentrated and displayed on the transmitter (mass, volume, V20, ρ20), which is convenient for the measurement personnel to view and operate and reduce the measurement time;

 

3. It can be uploaded to the database (data can be stored and traceable), and the degree of data visualization is high;

 

4. There are no moving parts inside the Mass Flow Meter, no regular maintenance is needed, and the service life can reach more than ten years, which is much higher than the Volumetric Flow Meters in three to five years, which can greatly reduce the equipment maintenance cost.

 

The Mass Flow Meter can meet the needs of customer V20 and quality handover and quality depots in oil terminals.

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