ICE Class Arctic Tanker

7/23/2019 ICE Class Arctic Tanker

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Arctic Tanker Design for Extreme ConditionsKey Considerations

Kirsi Tikka – ABS

Vladimir Evenko - RS

Pavel Shikhov – RS

Mun-Keun Ha – SHI

Jae-Woon !hoi -SHI

Arctic ShippingConference

27 September 2006Hamburg, Germany



Drivers in Ep!oitation of "i! an# Gas

• Political, social and economic changes

• Increased global energy demand driven byChina and India

• Political instability in the Middle East

• Environmental protection



Cha!!enges for Energy $ransportation

• Suez Crisis: VCC and!CC

• E""on Valdez accident:Mandatory double hull

re#uirements• Sa$ety, Security and

Environmental Protection:ISM, ISPS, %MS&

• Mar'et $or (atural )as:arge () carriers

• *il $rom +ussia: arger icestrengthened tan'ers

Indus"r# Res$onse



Arctic Cha!!enge

• ac' o$ e"perience ith largervessels

• +emoteness and lac' o$

in$rastructure

• Impact on the cre

– Cold temperatures – ac' o$ light and visibility

• Sa$ety e#uipment $it $or the

conditions

• ac' o$ operational e"perience

• oads on the hull andappendices

• -irst year and multiyear ice

• .esign o$ e#uipment $or lo

temperatures

– -reezing conditions

– Icing and ice bloc'age

Sa%e"#



Arctic Cha!!enge

• %emperature

• Ice Conditions

• Visibility

• /ind• /aves

Environmen"al !ondi"ions



%interi&ation of an Arctic $an'er

• 0ull construction and e#uipment – Material selection

– %an' arrangement and heating

– .e1icing

• Systems and machinery – +eliability and redundancy

– .ec' machinery

– Piping

• Sa$ety systems – i$e saving appliances

– (avigational systems

• Ergonomic considerations – Enclosed or' spaces

– Protective gear

– Insulation o$ accommodation spaces• %raining and manning

• Environmental protection

Gui#ance for ship o(ners

an# shipyar#s on specia!consi#erations for harsh

environments



%interi&ation of an Arctic $an'er

Prevention of Ballast Tanks from Freezing

• &rrangement $or preventing $reezing in ballast tan'sat higher service temperatures

• 0eating calculations re#uired $or loer designservice temperatures



%interi&ation of An Arctic $an'er

• )eneral procedures based on overall heat trans$ercoe$$icients – *verly conservative

– ac's the in$ormation on sur$ace temperatures

• (e developed procedure based on the variable heattrans$er coe$$icient representing variable convectivecoe$$icient related to temperature and ind conditions – &pplied to the determination o$ heating capacity in a ballast tan' $or

the arctic shuttle tan'er2

Pro&edure %or Es"ima"in Re'uired Hea"in !a$a&i"# in Tanks















App!ication of )ce C!ass *e+uirements

• Classi$ication

• Ice Strengthening

• Main Engine *utput

• Propulsion System

RS Ice Rules - Content




• Ice Strength Characteristics• Ice thic'ness variable in &rctic 3 distribution la

determination

• .esign ice loads hen operating under 4ase .angerous

Conditions• 5ualitative description 3 Permissible Service Conditions

• 5uantitative description 3 Ice Classes

RS Ice Rules – Design Principles




6i7 /hen a ship is under permissible iceconditions, the hull3ice interaction should notlead to damages o$ the structuresdeteriorating the structural sa$ety o$ a ship2

6ii7 %he re#uired ship sa$ety level in ice duringvarious maneuvers and operations isprovided by the re#uirements to the minimalengine output2

Service Conditions – eneral Description



Permissi!le Service Conditions






• ! 8• /inter1Spring (avigation

• Independent *peration

• 4arents Sea

– E"treme navigation 3 high ris' o$ hull damage – 0eavy, Medium, Easy (avigation 3 operation alloed

• 9ara Sea – E"treme, 0eavy, Medium (avigation 3 operation prohibited

– Easy (avigation 3 operation alloed

Permissi!le Service Conditions - "#ample





• ! 8• /inter1Spring (avigation

• Icebrea'er Pilotage

• 4arents Sea

– E"treme, 0eavy, Medium, Easy (avigation 3 operation alloed

• 9ara Sea – E"treme, 0eavy (avigation 3 high ris' o$ hull damage

– Medium, Easy (avigation 3 operation alloed

Permissi!le Service Conditions - "#ample




• Ice hull damage is to be considered as result o$ singleaction o$ ice load

• .esign ice load corresponds to the ultimate hull structuralstrength at restricted plastic de$ormation

• & single ice damage ith probability ;< is to be consideredas normal operating practice

• %he ice load is to be assigned based on an e#ual damageprobability $or di$$erent ice strengthening zones2

• !ltimate strength criterion 1 .esign ice load not e"ceedingultimate load on structure

Structural Strengt$ Criteria




%ull form and ice !elt area




Side Structure )rillage

Plas"i& de%orma"ion o% side s"ru&"ure under i&e load (l"ima"e load &urve

&ltimate 'imit State



"ngine (utput

evel ice capability $or modern ice going vessels according to (e +S +ules and

Model and -ull scale tests


)orilsk-II* +ou,le a&"in Shi$

I&e &a"eor# – .(/

+is$la&emen" –01111"

Enine Po2er 3435111 kW

.are &a$a&i"# "anker 6Varande#7

I&e &a"eor# .(8+is$la&emen" 9:1111"

Enine Po2er 04;<111 kW

Mode Traditional mode

improved icebreaking

bow

DAT mode

Traditional mode

Astern mode

Model and full

scaletest 93-<m a" VS=0 93-<m a" VS=5 93-8m a" VS=0 93-8m a" VS=0

RS Ice Rules

3-<>m a" VS=0

3-<<m a" VS=5

3<<m a" VS=0 3-<m a" VS=0




Propeller 4lade

• .esign ice loads

• .esign stress

• Permissible stress

• Scantlings

Propulsion S)stem

bi!i f $ ' i )



aneuverabi!ity of -arge $an'ers in )ce

• 0ull shape $or ice brea'ing in ahead and astern modes• Podded propulsion

• Stopping ability

• Path stability

• Initial turning and ya chec'ing abilities• %urning ability

• Importance o$ model test $or chec'ing maneuverability

$han' you for your attention



$han' you for your attention

ICE Class Arctic Tanker

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