1. at Idemitsu Hokkaido Refinery
Tank Fire Caused by the
Earthquake
at Idemitsu Hokkaido Refinery
Makoto Hirai
Manager, Research and Technology
Idemitsu International (Europe) plc

2. Company Profile Outline of Tank Fire Conclusion AGENDA
Idemitsu is a total energy company. The business territory is from crude oil exploitation to retail gasoline.
In addition, as I told, we develop and sell coal, operate a petrochemical company, credit card company and so on.

3. Company Profile Outline of Tank Fire Conclusion AGENDA
Idemitsu is a total energy company. The business territory is from crude oil exploitation to retail gasoline.
In addition, as I told, we develop and sell coal, operate a petrochemical company, credit card company and so on.

4. 1. Company Profile Head Office : Tokyo, Japan Founded : June 20, 1911
Employees (Group) : 7,737 (31st March, 2006)
Net Sales (Group) : ,327 billions (\)
Refineries : (640,000B/D)
Overseas Office : In Middle East
Abu Dhabi, Tehran,
Dhahran, Muscat, Doha (5)

5. 1. Company Profile (Cont’d)
Oil Exploitation
Retail: 5,294 station
Domestic Transportation
Crude Oil Transportation
Idemitsu is a total energy company. The business territory is from crude oil exploitation to retail gasoline.
In addition, as I told, we develop and sell coal, operate a petrochemical company, credit card company and so on.
Oil Refining
4 Refineries
Chemical Plant
2 Plants

6. 1. Company Profile (Cont’d)
Location of Idemitsu Refineries
Hokkaido
Tokuyama
STARTED YEAR : 1973
*CDU / ARDS / R2R
Chiba
STARTED YEAR : 1957
Petrochemical Complex
*CDU / FCC
*Steam Cracker 450 Mt/yr
Aichi
○ Idemitsu Kosan Co.,Ltd has 6 refineries to meet the demand of
each region .
○ Total CDU capacity is 830 thousand BD and it is biggest among
independents.
○ Aichi and Hokkaido : OCR-RH-RFCC type process.
Bottom ratio is smallest in Japan.
○ Tokuyama refinery was installed in 1957 as our first refinery.
This refinery is most integrated with petrochemical companies in Japan.
We are developing new information system with 8 companies.
○ Chiba refinery has lubricant oil plants, and it locates near Tokyo
which is the biggest demand area.
Aichi
STARTED YEAR : 1963
Lube & Petrochemical Complex
*CDU / ARDS / FCC
*Steam Cracker 374 Mt/yr
STARTED YEAR : 1975
*CDU / ARDS / R2R / ALK

7. Company Profile Outline of Tank Fire Conclusion AGENDA
Idemitsu is a total energy company. The business territory is from crude oil exploitation to retail gasoline.
In addition, as I told, we develop and sell coal, operate a petrochemical company, credit card company and so on.

8. ２. Outline of Tank Fire
Two Tank Fire were occurred after Earthquake (at 4.50am,
26th September, 2003)
Tank No.
#30006(#3’6)
#30063(#3’63)
Tank Prof.
D:42.7m, H:24.39m, Max 32,779kl (FRT)
Content
(incident)
Crude Oil
(31,160kl)
Naphtha
(26,874kl)
Incident
case
Ring Fire
Full Surface Fire
Idemitsu is a total energy company. The business territory is from crude oil exploitation to retail gasoline.
In addition, as I told, we develop and sell coal, operate a petrochemical company, credit card company and so on.
Fire fighting
Situation
Occurred: at th Sep.
Extinguished: after 12hours
Occurred: at th Sep.
Extinguished: after 44hours

9. Overview of the 2003 Earthquake
Hokkaido Refinery Seismograph Data
Acceleration Time Series）
Time of
Earthquake
Depth of
epicenter
Magnitude
Location of
: About 04:50
September 26th 2003
: 42 km
: 8.0
: Latitude 41º46.78’
Longitude 144º4.71’
Hokkaido Refinery
Maximum surface acceleration
(Combined maximum acceleration : 86 gal)
Ｎorth-south ：69 gal
East-west ：76 gal
Up-down ：38 gal
epicenter
N.B. This map has been reproduced with permission from Numerical Map (coast lines, administrative Areas) published by the Geographical Survey Institute （Permit Number 2003 Copy No. 367）
Appendix 1　
Overview of the TokachiｰOki Earthquake and Hokkaido Refinery Seismograph Data

10. Appendix 2 Hokkaido Refinery: Outline of Damage to Tanks (Site Plan)
NO.9
NO.8
NO.7
NO.5
NO.4
NO.3
NO.1 Berth
Sea water pump
West Bridge
20201
20202
20203
20206
20207
20208
20204
20205
20209
20210
T-V230
T-V219
Area 200
5113
10111
10106
10101
10112
10107
5108
5114
5109
5115
5110
5104
5105
T-V129
T-V220
Area 100
Tank with outbreak of fire
on 28th
Rising Bridge
Lorry Shipments
While Oil Lorry
Black Oil Lorry
LPG Larding Area ＩＰ
Storage
No. 2 Flare
ＡＳ Loading Area
2501
2502
3506
3507
1508
ＳＵＬ
3560
3561
3562
3564
3565
4454
4455
3452
3451
3563
3453
Measuring Facility
Shipping Facility
for Spherical Tanks
5503
3553
Area 500
Area 550
Area 450
Inner port
Office
Laboratory
20301
20302
20303
20304
20305
20306
10307
20308
5311
5312
3313
3315
3314
3316
Area 300
Area 50
5259
5260
40061
40062
10151
10251
10252
25153
25154
30351
10155
10253
10254
20262
20263
20264
Naphtha
30063
40064
10159
25157
25158
10255
10256
20265
20266
20267
10163
10164
10257
10258
Area 150
Area 250
Area 350
Area 0
Power Area
60001
60002
60003
60004
60005
B-H3
Crude Oil Direct
Desulphurization Facility
Sulphur Recovery
Facility
Hydrogen
Manufacturing
Gas
turbine
Steam
Crude Oil Fluid Catalytic
Analysis Facility
Diesel Depth Hydrogenation
Sulpherization Facility
Sulphur
Supply
No. 2
Electric
generator
Hydrogen Recovery
Facility
Atmospheric
Distillation
Facility
Crude oil
Primary Drainage
Treatment Facility
B-H1
B-H2
Supply Facility
No. 1 Nitrogen
Gas/LPG
Cleansing Facility
LPG Refining Facility
Depressurization
Distillation
Facility
30006
60007
60008
60009
Recovery
Sulfur
Facility
Central Transformer
Station
Deionizer
Contact Modification
Facility
Now-defunct
Naphtha Hydrogenation
Desulphurization Facility
計器室
変電所
10011
10012
40013
Tank with outbreak of fire
on 26th
No. 1 Flare
Industrial water
storage tank
Kerosene and Diesel Oil
Hydrogenation
Desulphurization Facility
Smokestack
assembly
Area 650 PC
Central Transformer
Station No. 2
YO-T1A
YO-T1B YO
Heavy Diesel Oil
Hydrogenation
Dissolution Facility
YO-T2A
YO-T2B
100651
100652
CPI
SDM Temporary Building
SDM Temporary Building 警防 ＲＮ Ｎ
：Roof sunken
：FRT
24°30′
100653
100654
：Roof damaged
：CFRT
Storage
Changing Room Tower
Cafeteria
Main
Building
24°30′
：Maintenance
Through Gate
Oil drainer T‐V690
放流口
Main Gate
Appendix 2 Hokkaido Refinery: Outline of Damage to Tanks (Site Plan)

11. ２. Outline of Tank Fire - #3’6 -
Incident was happened immediately after the Earthquake.
Because of the sloshing, crude oil was overflowed on the tank roof and dike.
Ignition source would be “Electric Sparks caused by fractures of electric cable” or “Electric Sparks from collision of floating roof and measurement cabin or fall of measurement cabin”.
Idemitsu is a total energy company. The business territory is from crude oil exploitation to retail gasoline.
In addition, as I told, we develop and sell coal, operate a petrochemical company, credit card company and so on.

12. measurement cabin stood fell on the floating roof
Collision
Electric spark
Sloshing height approx. 3.1ｍ
（calculated measure）
Measurement cabin
in a normal state
(reference)
Over flow
Height of collision between the pontoon’s outer rim and the base of the measurement cabin: approx. 2.9m
Gauge Pole
Pontoon
electric cable
where
measurement cabin stood
Measurement cabin
fell on the floating roof
Collision
Deck Plate
Appendix 3
Main Damaged Sections on Floating Roof of Crude Oil Tank

13. ２. Outline of Tank Fire - #3’63 -
Incident was happened 2days after of the earthquake.
Because of the sloshing, the floating roof was completely sunken. Foam was continuously applied after the earthquake to prevent from contact between naphtha and air, but strong wind broke the foam blanket in the morning of 28th Sep.
Idemitsu is a total energy company. The business territory is from crude oil exploitation to retail gasoline.
In addition, as I told, we develop and sell coal, operate a petrochemical company, credit card company and so on.

14. Appendix 4 Situation in Naphtha #30063 Tank before Ignition
Fixed foam system
(total 7 spots) 0ﾟ
We had been doing foam application
from fixed foam system from 26th.
But the foam blanket was
broken by strong wind
in the morning of 28th.
Boundaries of foam at about 10:35
(appears to have been 3/4)
Ripples seem to have been caused by strong wind
The foam application
was tried again,
but the wind was too
strong to keep
the foam blanket.
Ignition occurred after
about 10 mins.
270ﾟ
90ﾟ
Point of ignition
Foam seems to have been blown away to direction of 160°
Boundaries of foam
at about 10:45 of ignition
(appears to have been
1/3 – 1/4)
Fuel level： 18.5m
Naphtha
Distance from top of tank to fuel surface： 5.9m
180ﾟ
Measurement cabin
　　#30063 tank
-Content: Naphtha
-Diameter: 42.7m
Roof completely
fell into fuel
Wind: South south east 7.3m/s, Temperature: 16.9 degC
Appendix 4　Situation in Naphtha #30063 Tank before Ignition

15. ２. Outline of Tank Fire - Video -
Japanese National Broadcast made a TV programme about Idemitsu Incident.
#3’6 3min 17- 4min 30
#3’63 5min 59-6min 20, 10min 05 11min 54
Sloshing, etc 15min min 10
Idemitsu is a total energy company. The business territory is from crude oil exploitation to retail gasoline.
In addition, as I told, we develop and sell coal, operate a petrochemical company, credit card company and so on.

16. Company Profile Outline of Tank Fire Conclusion AGENDA
Idemitsu is a total energy company. The business territory is from crude oil exploitation to retail gasoline.
In addition, as I told, we develop and sell coal, operate a petrochemical company, credit card company and so on.

17. 3. Conclusion
１. We lowered fuel operation levels of 3 Refineries (Hokkaido,
　 Chiba and Aichi), total volume of 600,000 kl, taking into
consideration their respective velocity response spectrum.
２. We removed structures on tank, in particular, all measurement
cabins in Hokkaido Refinery.
３. We are reinforcing the floating roofs against earthquakes.
(1) 100,000 kl tanks in Hokkaido Refinery are changed to
double-deck structure.
(2) For other tanks, the pontoons of floating roof are reinforced.
４. We purchased 2 big monitors, 30,000 l/min and 11,000 l/min,
in Hokkaido Refinery.
Idemitsu is a total energy company. The business territory is from crude oil exploitation to retail gasoline.
In addition, as I told, we develop and sell coal, operate a petrochemical company, credit card company and so on.

18. Thank you for your attentions.

19. End of Report