MEDiS Model for a Crude Oil Refinery
The Company
As an example, consider an oil refining company named Penapisan
Mudah Sdn Bhd. This company processes crude oil and sells petroleum products to both the local and foreign spot markets. The refinery runs 24 hours a day, 365 days a year, with shutdowns only for maintenance and statutory inspections by the Federal Machineries Department (FMD), the national inspection and certification authority that ensures all critical plant and equipment like pressure vessels, boilers, furnaces, heat exchangers, etc, are properly maintained for the safe operations of the plant.
Brief of the Operations of Penapisan Mudah Sdn Bhd.
-
Penapisan Mudah Sdn Bhd processes both local and
foreign crude oils . To meet the market demand for the various petroleum products, the company also injected condensates into the crude oil to produce products of the right mix and in the right quantities.
-
The refinery consumes 4 types of energy: electricity for the electrical equipment and overall lighting; and
refinery gas, natural gas and fuel oil for its furnaces, steam boilers and other plant utilities. Electricity is purchased from a supplier, the Elektrik Kuasa Company Sdn Bhd, that provides a metering station within the refinery. Natural gas is purchased from another supplier, Syarikat Gas Asli Sdn Bhd, which is piped into the refinery from the supplier's grid and metering station.
-
For the main feedstock, Penapisan Mudah Sdn Bhd purchases
local crude oil from the national oil company, Syarikat Petrolium Negara Sdn Bhd. To produce the light petroleum products,
condensates were injected into the crude oil. Condensates are purchased from both local and foreign suppliers. To produce the heavy products like fuel oil and bitumen,
foreign crude oils were also imported and processed. Slops produced from the refining operations were also injected into crude for reprocessing. The feedstocks for the refinery are stored in separate storage tanks.
-
The 5 main outputs or products of the refinery are LPG, Petrol, Diesel,
Fuel Oil and Bitumen.
These products are stored in storage tanks before distribution to the various
consumers via rail, road and sea.
Operational Information
The operational information for the company, Penapisan Mudah Sdn Bhd, for the accounting period for:
Year 2001, Quarter 2, beginning from April 1, 2001 and ending on
June 30, 2001 are as follows:
F1 - Stock of Energy Products
Products
|
Opening
Stock
|
Closing
Stock
|
Unit
Qty
|
Local Crude Oil
|
12,567
|
5,984
|
MTON
|
West Asian Crude Oil
|
11,300
|
19,140
|
MTON
|
Other Foreign Crude Oil
|
3,130
|
3,135
|
MTON
|
Local Condensates
|
3,200
|
1,460
|
MTON
|
Foreign Condensates
|
1,100
|
850
|
MTON
|
Refinery Gas
|
0
|
0
|
MTON
|
LPG
|
12,567
|
11,283
|
MTON
|
Petrol
|
13,540
|
17,040
|
MTON
|
Diesel
|
3,400
|
3,135
|
MTON
|
Fuel Oil
|
7,200
|
1,660
|
MTON
|
Bitumen
|
1,100
|
1,250
|
MTON
|
Slops
|
3,415
|
1,865
|
MTON
|
F2 - Energy Intake into Plant / Process / Operations
Product
|
Local
Purchase
|
Production
Supply Qty
|
Foreign
Imports
|
Unit Qty
|
Natural Gas
|
231,860
|
0
|
0
|
MMSCF
|
Electricity
|
3,850
|
0
|
0
|
MWH
|
Local Crude Oil
|
135,980
|
0
|
0
|
MTON
|
West Asian Crude Oil
|
0
|
0
|
57,96
|
MTON
|
Other Foreign Crude Oil
|
0
|
0
|
35,876
|
MTON
|
Local Condensates
|
2,340
|
0
|
0
|
MTON
|
Foreign Condensates
|
0
|
0
|
1,230
|
MTON
|
Refinery Gas
|
0
|
6,882
|
0
|
MTON
|
LPG
|
0
|
11,460
|
0
|
MTON
|
Petrol
|
0
|
53,540
|
0
|
MTON
|
Diesel
|
0
|
60,312
|
0
|
MTON
|
Fuel Oil
|
0
|
71,658
|
0
|
MTON
|
Bitumen
|
0
|
25,314
|
0
|
MTON
|
Slops
|
0
|
1,084
|
0
|
MTON
|
F3 - Energy Own Consumption and Conversions / Output
Please note :
-
Own Consumption means burning the product as fuel in the refining process
-
Conversion means the product is converted to other products by
the refining process
Product
|
Own
Consumption
|
Conversion
|
Unit Qty
|
Natural Gas
|
216,530
|
0
|
MMSCF
|
Electricity
|
3,850
|
0
|
MWH
|
Local Crude Oil
|
0
|
139,443
|
MTON
|
West Asian Crude Oil
|
0
|
49,153
|
MTON
|
Other Foreign Crude Oil
|
0
|
35,225
|
MTON
|
Local Condensates
|
0
|
3,980
|
MTON
|
Foreign Condensates
|
0
|
1,449
|
MTON
|
Refinery Gas
|
4,877
|
0
|
MTON
|
LPG
|
0
|
0
|
MTON
|
Petrol
|
0
|
0
|
MTON
|
Diesel
|
0
|
0
|
MTON
|
Fuel Oil
|
0
|
0
|
MTON
|
Bitumen
|
0
|
0
|
MTON
|
Slops
|
1,980
|
0
|
MTON
|
F4 - Sales of Energy Products by Distribution Channels
|
|
|
|
|
|
|
|
Natural Gas
|
0
|
0
|
0
|
0
|
0
|
MMSCF
|
Electricity
|
0
|
0
|
0
|
0
|
0
|
MWH
|
Local Crude Oil
|
0
|
0
|
0
|
0
|
0
|
MTON
|
West Asian Crude Oil
|
0
|
0
|
0
|
0
|
0
|
MTON
|
Local Condensates
|
0
|
0
|
0
|
0
|
0
|
MTON
|
Foreign Condensates
|
0
|
0
|
0
|
0
|
0
|
MTON
|
Refinery Gas
|
0
|
0
|
0
|
0
|
0
|
MTON
|
LPG
|
0
|
12,494
|
0
|
0
|
0
|
MTON
|
Petrol
|
0
|
47,975
|
0
|
0
|
0
|
MTON
|
Diesel
|
0
|
56,765
|
0
|
2,540
|
0
|
MTON
|
Fuel Oil
|
12,450
|
60,997
|
860
|
0
|
1,338
|
MTON
|
Bitumen
|
0
|
24,824
|
0
|
0
|
0
|
MTON
|
Slops
|
0
|
0
|
0
|
0
|
0
|
MTON
|
F5 - Losses of Energy Products
Products
|
Losses
Flaring
|
Losses
Storage
|
Losses
Operation
|
Losses
Transportation
|
Losses Other
|
Unit Qty
|
Natural Gas
|
3,460
|
0
|
11,593
|
0
|
277
|
MMSCF
|
Electricity
|
0
|
0
|
0
|
0
|
0
|
MWH
|
Local Crude Oil
|
0
|
2,092
|
0
|
1,028
|
0
|
MTON
|
West Asian Crude Oil
|
0
|
639
|
0
|
331
|
0
|
MTON
|
Other Asian Crude Oil
|
0
|
429
|
0
|
217
|
0
|
MTON
|
Local Condensates
|
0
|
72
|
0
|
28
|
0
|
MTON
|
Foreign Condensates
|
0
|
21
|
0
|
10
|
0
|
MTON
|
Refinery Gas
|
1,856
|
0
|
0
|
0
|
149
|
MTON
|
LPG
|
0
|
174
|
0
|
76
|
0
|
MTON
|
Petrol
|
0
|
715
|
0
|
350
|
0
|
MTON
|
Diesel
|
0
|
865
|
0
|
408
|
0
|
MTON
|
Fuel Oil
|
0
|
470
|
0
|
0
|
1,083
|
MTON
|
Bitumen
|
0
|
340
|
0
|
0
|
0
|
MTON
|
Slops
|
0
|
657
|
0
|
0
|
0
|
MTON
|
The MEDiS Balance Model for Penapisan Mudah Sdn Bhd.
The input forms F1, F2, F3, F4 and F5 as shown above are provided as web based online inputs to the data provided for MEDiS.
Access to the above forms is only possible with authentication, login name and password. The result of the submission of those forms is a combined or assembled table shown below. Every submitted value is captured in the the table. The table calculates the sum of all the inputs and the sum of all the outputs on a row by row basis. The result of the calculation is provided in the rightmost column of each row.
As we can see on the right most column, the value of "BALANCE"
is zero. This is the case for the set od data submitted that is fully balanced.
Otherwise the data provider will have to go back to the respective forms ,
modify and resubmit inputs until the "BALANCE" values are all zero. This is the
condition required for Balance in the MEDiS model.
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