Tank Fire Caused by the

Earthquake

at Idemitsu Hokkaido Refinery

Makoto HiraiManager, Research and TechnologyIdemitsu International (Europe) plc

AGENDA

1. Company Profile

2. Outline of Tank Fire

3. Conclusion

AGENDA

1. Company Profile

2. Outline of Tank Fire

3. Conclusion

Head Office : Tokyo, Japan Founded : June 20, 1911 Employees (Group) : 7,737 (31st March, 2006) Net Sales (Group) : 3,327 billions (\) Refineries : 4 (640,000B/D) Overseas Office : 36

In Middle East

Abu Dhabi, Tehran,

Dhahran, Muscat, Doha (5)

1. Company Profile

Oil Exploitation

Crude Oil Transportation

Oil Refining 4 RefineriesChemical Plant 2 Plants

Domestic Transportation

Retail: 5,294 station

1. Company Profile (Cont’d)

Aichi

Tokuyama

Hokkaido

ChibaSTARTED YEAR : 1957

Petrochemical Complex

*CDU / FCC

*Steam Cracker 450 Mt/yr

STARTED YEAR : 1975

*CDU / ARDS / R2R / ALK

STARTED YEAR : 1973

*CDU / ARDS / R2R

STARTED YEAR : 1963

Lube & Petrochemical Complex *CDU / ARDS / FCC

*Steam Cracker 374 Mt/yr

Aichi

1. Company Profile (Cont’d)

Location of Idemitsu Refineries

AGENDA

1. Company Profile

2. Outline of Tank Fire

3. Conclusion

２ . Outline of Tank Fire

Two Tank Fire were occurred after Earthquake (at 4.50am, 26th September, 2003)

#30006(#3’6) #30063(#3’63)Tank No.

D:42.7m, H:24.39m, Max 32,779kl (FRT)Tank Prof.

Crude Oil(31,160kl)

Naphtha(26,874kl)

Content(incident)

Ring Fire Full Surface FireIncident

case

Occurred: at 4.51 26th Sep.

Extinguished: after 12hours

Occurred: at 10.45 28th Sep.

Extinguished: after 44hours

Fire fighting Situation

Appendix 1 　Overview of the Tokachi ｰ Oki Earthquake and Hokkaido Refinery Seismograph Data

Overview of the 2003 Earthquake Hokkaido Refinery Seismograph Data Acceleration Time Series）

Time of Earthquake

Depth of epicenter

Magnitude

Location ofepicenter

: About 04:50 September 26th 2003

: 42 km

: 8.0

: Latitude 41º46.78’ Longitude 144º4.71’

Maximum surface acceleration (Combined maximum acceleration : 86 gal) Ｎ orth-south ： 69 gal East-west ： 76 gal Up-down ： 38 galN.B. This map has been reproduced with permission

from Numerical Map 200000 (coast lines, administrative Areas) published by the Geographical Survey Institute （ Permit Number 2003 Copy No. 367 ）

epicenter

Hokkaido Refinery

24°30′

警防

60001 6000560002 60003 60004

6000960007 6000830006

40061 40062

4006430063

10151

10155

10159

10163 10164

25153 25154

25157 25158

10253

10255

10257

10252

10254

10256

10258

20262 20263 20264

20265 20266 20267

30351

変電所

計器室1001110012 40013

Electric generator

Inner portOffice Laboratory

Cafeteria

5259 5260

B-H3

Deionizer

Central TransformerStation

Industrial water storage tank

YO

CPI

YO-T1A YO-T1B

YO-T2A YO-T2B

Central TransformerStation No. 2PC

Storage

NO.9NO.8

NO.7 NO.5 NO.4 NO.3 NO.1 Berth

Sea water pump

10251

Power Area

B-H1B-H2

No. 1 Flare

Changing Room Tower

Main Building

Now-defunct

Smokestack assembly

放流口

Rising Bridge

Atmospheric Distillation

Facility

Hydrogen Recovery

Facility

Contact Modification Facility

Naphtha HydrogenationDesulphurization Facility

Kerosene and Diesel Oil Hydrogenation Desulphurization Facility

Heavy Diesel OilHydrogenation

Dissolution Facility

West Bridge

DepressurizationDistillation

Facility

No. 1 Nitrogen Supply FacilityGas/LPGCleansing FacilityLPG Refining Facility

Through Gate

Main Gate

Crude Oil Direct Desulphurization Facility

Sulphur Recovery Facility

Hydrogen Manufacturing Facility

Gas turbine

Steamturbine

Crude Oil Fluid Catalytic Analysis Facility

Diesel Depth HydrogenationSulpherization

Facility

Sulphur Supply FacilityNo. 2

SDM Temporary Building

SDM Temporary Building

SulfurRecovery

Facility

Primary DrainageTreatment Facility

Area 650

100651 100652

100653 100654

Oil drainer T‐V690

Naphtha

Crude oil

24°30′

ＲＮ

Tank with outbreak of fire on 26th

Area 0

Area 50

511310111

10106

10101

10112

10107 5108

5114

5109

5115

5110

5104 5105

T-V129T-V220Area 100

Area 150 Area 250 Area 350

20301 20302 20303 20304

20305 20306 10307

20308

5311 5312

3313

3315

3314

3316

Area 300

Lorry Shipments

While Oil Lorry

Black Oil Lorry

LPG Larding Area

ＩＰ

Storage

No. 2 Flare

ＡＳ Loading Area

2501 2502

3506 3507

1508ＳＵＬ 3560 3561 3562

3564 3565

4454 4455

34523451

3563

3453

Measuring FacilityShipping Facility

Shipping Facility for Spherical Tanks

5503 3553

Area 500 Area 550

Area 450

Ｎ

20201 20202 20203

20206 20207 20208

20204 20205

20209 20210

T-V230T-V219

Area 200

： Roof damaged

： FRT

： Maintenance

： CFRT

： Roof sunken

Appendix 2 Hokkaido Refinery: Outline of Damage to Tanks (Site Plan)

Tank with outbreak of fire on 28th

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”.

Electric spark

Measurement cabin in a normal state

(reference)

Measurement Cabin

Pontoon

Gauge Pole

Collision

electric cable

Measurement cabin fell on the floating roof

where measurement cabin stood

Sloshing height approx. 3.1 ｍ（ calculated measure ）

Height of collision between the pontoon’s outer rim and the base of the measurement cabin: approx. 2.9m

Deck Plate

Appendix 3 Main Damaged Sections on Floating Roof of Crude Oil 30006 Tank

Over flow

Collision

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.

Measurement cabin

Naphtha

Roof completelyfell into fuel

Fuel level ： 18.5m

Distance from top of tank to fuel surface ： 5.9m

Wind: South south east 7.3m/s, Temperature: 16.9 degC

Foam seems to have been blown away to direction of 160°

Ripples seem to have been caused by strong wind

180 ﾟ

90 ﾟ270 ﾟ

0 ﾟFixed foam system(total 7 spots)

Boundaries of foam at about 10:45 of ignition (appears to have been 1/3 – 1/4)

Boundaries of foam at about 10:35(appears to have been 3/4)

Appendix 4　 Situation in Naphtha #30063 Tank before Ignition

Point of ignition

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.

The foam applicationwas tried again, but the wind was too strong to keep the foam blanket.Ignition occurred after about 10 mins.

　　 #30063 tank-Content: Naphtha-Diameter: 42.7m

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 22 - 22min 10

AGENDA

1. Company Profile

2. Outline of Tank Fire

3. Conclusion

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.

Thank you for your attentions.

End of Report