ships repair conversion

7/25/2019 Ships Repair conversion

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S h i p R e p a i r

a n dS u r v e y i n g

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R e p a i r

C o n v e r s i

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&hat is Conversion'

Conversion pro(e)ts )an *e re+erred to as the pro(e)ts dealing ,ithpro)esses that vary +rom an etreme )ase ,here a ships ,hole

purpose is )hanged/ as ,hen $0 tankers ,ere )onverted to *e)omethe rst )ontainer ships/ or ,artime )orvettes to *e the rst +a)torytra,lers/ to the (um*oisations ,here the role is un)hanged *ut the

ship is in)reased in si2e to ena*le the 3uantity o+ )argo or thenum*er o+ passengers )arried to *e greatly in)reased. #r even it

)ould *e )arried out to )orre)t or in)rease the sta*ility o+ the vessel.

$ypes o+ Conversion pro(e)ts

14 5ro(e)ts dealing a+ter a ship has *een in servi)e +or years6

-7 5ro(e)ts ,here ships ,hole purpose is )hanged.

-78um*oisations

04 5ro(e)ts dealing *e+ore a ship )an enter servi)e6

-75ro(e)ts )on)erned ,ith design de+e)ts su)h as sta*ilityissues.

$he t,o ma(or +a)tors ,hi)h seems to apply to all )onversions are 6

14 inimise the )ost.

04 inimise the time to )arry out pro(e)t.

Need to meet ne, rules&hen planning any ma(or modi)ation/ it should *e *orne in mindthat the modied ship ,ill almost )ertainly have to meet the latestI# rules ,hi)h may *e mu)h more severe than the rules to ,hi)h

the ship ,as originally *uilt and )hanges may *e re3uired in all sortso+ items not in any ,ay a:e)ted *y the desired modi)ation.

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Capa)ity in)reasing )onversion pro(e)ts

;uite a large proportion o+ )onversions/ ,hether involving a )hange

in role or not/ re3uire an in)rease in the displa)ement or in theinternal volume o+ the hull.

Some o+ the types 6-

dding a length o+ parallel middle *ody

ost (um*oisations involve this pro)edure.

Steps in this pro)ess )an *e dened as6

-7Splitting the eisting ship in t,o in dry do)k.

-7#ne part is


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-7Ship is split hori2ontally.

-7ll the stru)tures a*ove a )ertain level is raised.

-7Insertion o+ ne, units that ,ill in)rease the depth to a desired

gure.

-7Virtually ne, ship o*tained.

Sta*ility improvement )onversion pro(e)ts

odi)ations to improve sta*ility are the net most )ommon

re3uirement/ and on)e again these may *e re3uired either to permitthe addition o+ top ,eight in a )onversion or as a ,ay o+ re)ti+ying

inade3uate sta*ility +ound ,hen a ship is in)lined on )ompletion.

Sponsons )an provide a ma(or improvement in sta*ility and are anepedient ,hi)h has *een used 3uite +re3uently.

-7$he lo,er edge o+ a sponson should *e some distan)e *elo, the

lo,est operational ,aterline at ,hi)h the gain in sta*ility is re3uired.

-7$he upper edge o+ the sponson ,ill *e determined *y ,hether it is*eing provided to in)rease the G at inta)t operational dra+ts or atthe dra+ts a+ter damage and ,hether it is to in)rease G> and ?or

range in either o+ these )onditions.

-7 $he +ore and a+t length o+ a sponson on a ne lined ship must *edetermined to a large etent *y the length o+ parallel middle *ody at

the height )overed *y the sponson.

-7$he ends o+ sponsons should *e arranged on the *ulkheads andthe sponsons should have ,atertight divisions in line ,ith ea)h

ship@s ,atertight *ulkheads.

-7Anless there is a limitation on the overall ,idth o+ the ship to suit*erthing or similar )onsideration or the re3uired in)rease in sta*ilitydemands a ,ider sponson/ a ,idth o+ a*out Bmm is used.

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Sponsons ftted to an oilfeld s#pport vessel, Sponsons $. increase /M0

sponsons "1 increase 23 and t+e range,

$anker Conversions to E5S#s

Eloating produ)tion/ storage/ and oFoading systems E5S#Hs4re)eive )rude oil +rom deep,ater ,ells and store it in their hull tanks

until the )rude )an *e pumped into shuttle tankers or o)eangoing*arges +or transport to shore. $hey may also pro)ess the oil and insome later E5S#Hs *e used +or Gas distri*ution.

$hey have *e)ome even more important ,ith the push *y

the o:shore industry into ever deeper ,aters. Eloating produ)tion/storage/ and oFoading?


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e!b#ild4 567

Conversion4 867

S+ip - Type Floating Prod#ction 9nits

E54S# Capa*ilities/ $ypi)al Re3uirements

Storage 0/-0// *arrels

5rodu)tion D/-D/*opd

Vessel 1/-DJ/ tonnes

&ater depth -1J metres

$opsides 0-DD tonnes

Risers 1-7 D

&ave height *enign-7 D metres

ir temp -0oC-7 DoC

&hat makes an E5S# di:erent +rom a trading tanker'

#perations and sa+ety re3uirements

Layout and arrangement

Spe)ied servi)e?lo)ation

Rules and regulations

=esign?)onstru)tion?)ommissioning In-situ inspe)tion?maintenan)e

E5S# )onsists o+6-

ooring ! RisersInter+a)e *et,een E5S# ! eld

$opsides

#il/ gas and ,ater pro)essing systems5o,er generation

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VesselCrude oil storage))ommodationServi)es

#Foading system

ain Eeatures )onsidered +or sele)tion o+ an eistingtanker6-

Storage )apa)ity at peak time

vaila*le de)k spa)e

Load *earing )apa*ilities and remaining +atigue li+e

=e)k spa)e should *e enough to a))ommodate top side produ)tion

modules/ turret and other de)k ma)hineries.

lthough the top side modules )omprise only 1D-1JM o+ the totaldispla)ement/ they may *e very mu)h )ompli)ated/ espe)ially +orlarge through put elds.

Conversion - a(or &orks %isting ull

Removals?modi)ations

ull steel,ork/ )oatings et).

propulsion ma)hinery and other ma)hinery

rudder ? steering gear

a))ommodation/ de)khouses helide)k

piping systems

Apgrades

arine and topsides )ontrol system integration

re prote)tion systems and their integration

po,er generation systems and their integration

)argo tank venting arrangement

*allast and )argo oil pumps and valves

inert gas system

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utility systems e.g. ,ater/ ,ater/ steam/ heating4

Conversion - a(or &orks ull dditions

$urret or spread mooring system/ e3uipment/ et).

riser por)hes or


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eli)opter de)k

$he sitting o+ helide)k should *e near and a*ove the living spa)es.

$he positioning o+ helide)k should take )are o+ the ,indenvironment/ parti)ularly tur*ulen)e/ verti)al ,ind velo)ity and hotgas plumes +rom


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$he ,ork-s)ope involved6

-7%tensive hull modi)ations +or the patented $ripodCentenary ooring System $CS4

-7Installation o+ ne, generating )apa)ity

-7Ea*ri)ation and installation o+ a heli)opter de)k/ pro)essde)k/

ships repair conversion

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