DSV Positioning and Survey Procedures OG-AA-K-2984 REV 0

8/18/2019 DSV Positioning and Survey Procedures OG-AA-K-2984 REV 0

1/35

THE SHELL PETROLEUM DEVELOPMENT COMPANY OFNIGERIA LIMITED

Stolt Offshore Services SACombines Stolt Comex Seaway and ETPM

S !co"tr#ctor $if #%%lic#!le&

Pro'ect(

Offshore Gas Gathering System ProjectL- !"#$

Pro'ect No)(

*+*+ ,-+-

Doc .e"t title(PRE/CROSSING 0OR1S(DSV POSITIONING AND SURVEYPROCEDURES

Doc .e"t N .!er(OG/AA/1/+234 Page !%"&

!&% '% ( )ss*e for Com+any,s Comments .L /0 E1 0 !'% &% ( )ss*e for )2C .L /0 E1

3e45 2ate 2esignation Orig Ch6 0++r 0++r STOLT STOLT STOLT SP2C

REVISION DESCRIPTION AND AFFECTED SECTIONS AUTHORISED 5Y


2/35


De%#rt.e"t(

SURVEY

Revisio"(A

D#te of Iss e(+36-76-+

Doc .e"t Title(

2S/ POS)T)O.).G 0.2 S73/E8P3OCE273ES

Stolt Doc .e"tN .!er

OG-00-1-(#$&

PAGE ( 6 +3

A ISSUE FOR I)D)C) N) 1OMA8DA

- ISSUE FOR COMPANY9S COMMENTS N) 1OMA8DA


3/35


De%#rt.e"t(

SURVEY

Revisio"(-

D#te of Iss e(:46-,6-+

Doc .e"t Title(



OG-00-1-(#$&

PAGE 7 6 74

TA5LE OF CONTENTS

: INTRODUCTION ,

:): O!'ectives))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))

:)+ Res%o"si!ilities))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))

:)7 Defi"itio"s)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))):)4 Refere"ces))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))

+ GEODETIC PARAMETERS AND CO/ORDINATES 3

+): Loc#l Geo;es)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))


4/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE 4 6 74

*)+ As/! ilt S rvei% Pi%eli"e))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))

3)* As/fo "; :+= A>i% Pi%eli"e))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))

3)? Post/l#< SYMP to DP/5 U.!ilic#l))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))

3)3 Post/l#< :*= SYMP to DP/A))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))

3)2 Post/l#< :3= SYMP to DP/A))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))

3):- Post/l#< :+= SYMP to DP/A))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))

3):: NITEL FOC)))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))


5/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE , 6 74

: INTRODUCTION

:): O!'ectives

The +*r+ose of this doc*ment is to gather for all concerned +ersonnel9 the necessaryinformation and references for the +ositioning and s*r4ey o+erations onboard thedi4ing s*++ort 4essel Ste+hanit*rm for the di4ing o+erations on the +ro+osed "(:OGGS 3P-0 to ;onny .L.G Tr*n6line and the +ro+osed (&: SP2C?

Co"tr#ctor Stolt Offshore Ser4ices S0 >Stolt?

CM Central MeridianCTDS >or CT29 or T2S? Cond*cti4ity9 Tem+erat*re9 2e+th and Salinity

meas*rements +erformed to calc*late the 4elocity of the aco*sticwa4es thro*gho*t the water col*mn5

DCC 2istance Cross Co*rseDGPS 2ifferential Global Positioning SystemDP 2ynamic PositioningDSV 2i4e S*++ort /esselHH0S @ighest @igh Aater S+rings

. 6ilometre1P 1ilometre Post


6/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE * 6 74

LAT Lowest 0stronomical TideLL0S Lowest Low Aater S+ringMSL Mean Sea Le4elNLNG .igeria Li=*ified .at*ral Gas Ltd". .a*tical MileOGGS Offshore Gas Gathering System@C B*ality ControlRP/A 3iser Platform 0SYMP >Shell E0? Soft 8o6e Mooring PlatformUS5L 7ltra Short ;ase Line *nderwater aco*stic +ositioning system50ll co-ordinates within this doc*ment are ex+ressed in terms of the +rojection anddat*m defined in Section ( 5


7/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE ? 6 74

:)4 Refere"ces

3eference is made to the following doc*ments

Title So rce Doc .e"t No D#te"(: Pre-crossing )nstallation Proced*re Stolt Offshore

Ser4icesOG-00-1-(#('

(&: Pre-crossing )nstallation Proced*re Stolt OffshoreSer4ices

OG-00-1-(#"&

S*r4ey e=*i+ment D Calibration Proced*res Stolt OffshoreSer4ices

OG-00-1-(# ( #%! % !

Pre-engineering and Pre-lay >"(:? S*r4ey3e+ort

Stolt OffshoreSer4ices

OG-3P-1-(#$ (!% !% (

Shell E0 Pi+elines%7mbilicals Post-lay 3e+ort Stolt OffshoreSer4ices

2-)S- "-## March( (

"(F OGGS Tr*n6line >OGGS3P-0 - OGGS3ecei4ing Malaysia? S2.;@2 >s*++lied byC*stomer?

# &"- 9 ).T- "3e45(

!&% $%

"(F OGGS Tr*n6line >OGGS3P-0 - OGGS3ecei4ing Malaysia? S2.;@2 >s*++lied byC*stomer?

!###% " 0%# &"%).T "% ! to

(#9 3e4 !

($% (%

(&: Malaysia? S2.;@2

# &"- 9 ).T- &3e45!

!$% &%

(&: Malaysia? S2.;@2

!###% " 0%# &"%).T &% ! to

! 9 3e4 !

!$% &%

Pro+osed OGGS and ;T)P Pi+eline 3o*te

Plan

SP2C +## & ' ! %##

.)TEL


8/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE 3 6 74

+ GEODETIC PARAMETERS AND CO/ORDINATES

+): Loc#l Geo;es<

The following geodetic dat*m9 s+heroid and ma++ing +rojection +arameters will be*sed

D#t .(

2at*m Minna >.igeria?S+heroid Clar6e !$$ >modified?Semi-major axis " $ (!&' m)n4erse flattening (#"5& '

Pro'ectio" ;efi"itio"(

Grid name .igerian Aest ;eltProjection ty+e Trans4erse Mercator Central meridian &H " I 5 FELatit*de of origin &H I 5 F.


9/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE 2 6 74


10/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE :- 6 74

Tr#"sfor.#tio"s fro. 0GS 34 to Mi""# D#t .(

To con4ert +ositional data from AGS $& to the Minna 2at*m9 the following +arameters were a++lied

D) * +111.$16 metresD, * +87.852 metresD * -114.4$$ metres

ot ) * -1.87527 se&ondsot , * -0.20214 se&ondsot * -0.21$35 se&onds

S&a/in#

* -0.03245 ppm


11/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE :: 6 74

+)7 7+= Pi%eli"e Ro te Co/or;i"#tes

E#sti"> Northi"> 5e#ri"> R#;i s Le">th C . Le">th 1P Co..e"tFirst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onnyL#st '"! '&5# &(& '5# "'!5 ' 5 +,372-),* ('$5"#! )nterface

+)4 7+= Crossi"> Loc#tio"s

Crossi"> E#sti"> Northi"> 1P 0#ter De%th:-)?,= Te #co "'! !' "# !! '(5&" ((


12/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE :+ 6 74

:+)?,= Te #co " !!## "! ( &5&$ (:3= Te #co " &" # (# $$ $5!& (NITEL C#!le "$& ' ! # & #(5(" (!7*= A>i% &($#($ !"!' !" 5"# (":+= A>i% &(#! & !"!' !" 5' ("

Crossi"> E isti"> Pi%eli"e 6C#!le 5e#ri">

Pro%ose; 7+=5e#ri">

Crossi">A">le

:-)?,= Te #co ! J%"' J !"'J%(('J &(J:+)?,= Te #co '"J%(""J !((J%" (J #J:3= Te #co &J%(&&J !((J%" (J '$JNITEL C#!le # J%( J !((J%" (J "(J7*= A>i% "'$J%! $J # J%( J $$J:+= A>i% J%!$ J # J%( J # J

K in b*rial at the crossing location


13/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE :7 6 74

+), +4= Pi%eli"e Ro te Co/or;i"#tes

E#sti"> Northi"> 5e#ri"> R#;i s Le">th C . Le">th 1P Co..e"tFirst "!'&(&5# !'$((&5' ( (5'' 5 5


14/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE :4 6 74

+)* +4= Crossi"> Loc#tio"s

Crossi"> E#sti"> Northi"> 1P 0#ter De%thNITEL C#!le " !!($ !&&&$# ( 5#! !$mNITEL C#!le "!$((# # !"" '5$! ( mSYMP to DP/5 U.!ilic#l "((#(" $# $'5!#( ((m:*= SYMP to DP/A "((#" $$##' $'5( ((m:3= SYMP to DP/A "((#'& $$#'" $'5('& ((m:+= SYMP to DP/A "((# $$#"! $'5($ ((m

Crossi"> E isti"> Pi%eli"e 6C#!le 5e#ri">

Pro%ose; +4=5e#ri">

Crossi">A">le

NITEL C#!le !!'J%(#'J !#"J% !"J $JNITEL C#!le !'$J%""$J !' J%"" J $JSYMP to DP/5 U.!ilic#l #J%('#J !' J%"" J !J:*= SYMP to DP/A #J%('#J !' J%"" J !J:3= SYMP to DP/A $ J%( J !' J%"" J J:+= SYMP to DP/A $(J%( (J !' J%"" J $J

K in b*rial at the crossing location


15/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE :, 6 74

+)? Positio"#l I"for.#tio"

The following table lists the +latforms that may be *sed for 2GPS and com+ass4erifications or calibrations

N#.e 0GS34 Ni>eri#" 0est 5elt Co..e"tL#tit ;e Lo">it ;e Northi"> E#sti">

2P-0 &J&$, $5'":. 'J(!,& 5 !&:E $$ #!5 "( '"#5 Platform Centre>@eading & 5JT?

2P-; &J&$, ((5'&:. 'J( ,' 5 !&:E $#!!#5 "(& $(5! Platform Centre>@eading &&5 JT?

2P- &J' , '!5 (:. 'J! ,&$5 !:E #" $#5 "! ""$5$ Platform Centre>@eading &&5#(JT?

3P-0 &J&',"$5 ##$:. 'J(!,((5 :E $& #$5( "(' # 5 Platform Centre>@eading "!'5 JT?

See 0++endices $5( to $5!! for as-fo*nd +ositions of existing +i+elines and cables atthe crossings5


16/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE :* 6 74

7 PERSONNEL


17/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE :? 6 74

4 E@UIPMENT

This section details the +ositioning and s*r4ey e=*i+ment onboard the 2S/5

The following e=*i+ment will be mobilised

S*rface +ositioning Thales GeoSol*tions S6yit ;e Dist#"ce fro. RP/APort Gentil # J &!I S $J & I E !(6m9 "$&nmPort @arco*rt ! #! &J ' I . J I E !$"6m9 ##nmPointe .oire #& &J & I S !!J '(I E !9($ 6m9 #!nmL*anda #&' $J I S !"J !&I E !9 " 6m9 #" nm0bidjan #'' 'J !#I . &J !I A !9 &!6m9 ' (nm

3eal-time differential GPS ma6es it +ossible to correct the readings of GPS recei4erso+erating in a gi4en area with 4al*es corres+onding to the errors act*ally obser4ed ata reference station5

The system is +ro4ided with the latest Thales BC and m*lti-reference software +ac6age M*lti

0n 7ltra Short ;ase Line >7S;L? 1ongsberg Simrad @iP0P will be *sed to +ro4ides*b-sea +ositioning5 This system is +ermanently installed on the 4essel5 Thetrans+onder may be hand-held by a di4er 5


18/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE :3 6 74

4)7 G#tio" #"; D#t# Ac isitio" Scond*cti4ity%tem+erat*re%de+th%salinity? meter will be*sed to meas*re the necessary +arameters in order to com+*te the 4elocity of so*nd

+rofile thro*gh the seawater col*mn >*sing the Medwin or Ailson form*la?5

The so*nd 4elocity res*lts are entered into the @iP0P 7S;L s*rface *nit5


19/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE :2 6 74

, MO5ILISATION AND CALI5RATIONS

0ny calibrations +erformed +rior to the Project will be sent to C*stomer before thecommencement of o+erations5

The 2S/ will ha4e already been mobilised for another Project5

The following o+erations may be +erformed

- +roject briefingN- meas*rement chec6 of all hori ontal and 4ertical offsetsN- gyrocom+ass calibrationN- 2GPS 4erificationN- 7S;L calibrationN- chec6 o+eration of CT2S sensorN- in+*t of the wor6 +arameters into the na4igation +ac6age >geodetic

+arameters?N- in+*t of the database information into the na4igation +ac6age >existing

+i+eline and cable +ositions?N- in+*t of the +ro+osed +i+eline ro*tesN- com+lete mobilisation chec6 list and doc*mentation5

,): DGPS Verific#tio"

One of the following methods will be *sed to 4erify the 2GPS +ositioning system- a total station set *+ on and referenced to co-ordinated +oints on theshore will be *sed to obser4e the range and bearing to a reflector mo*nted ontothe GPS antenna on the 4essel5 The reflector +osition will be calc*lated and this

will be com+ared to the antenna +osition obser4ed at the 4essel5 The shore and4essel +arties will ens*re that they are *sing the same geodetic and +rojection +arametersN- the 4essel will +erform transit fixes aro*nd a +latform >see Section (5for +ositions of +latforms near the wor6 areas?5 The deri4ed +latform +ositionwill be com+ared to the 6nown +osition5 The calibration method is o*tlined inOG-00-1-(# (5


20/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE +- 6 74

,)+ G


21/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE +: 6 74

* OPERATIONS

3efer to the Pre-crossing )nstallation Proced*res for details of the +ro+osed di4eo+erations and tas6s5 The following sections o*tline the re=*irements of the s*r4ey

+ersonnel onboard the 2S/5

*): Positio"i">

The 4essel is a dynamically +ositioned Class )) m*lti-+*r+ose di4ing s*++ort 4essel5The +ro+osed9 di4ing location9 will be selected by the di4e s*+erintendent inconj*nction with the master5 Once selected9 the s*r4eyor will enter the re=*ired di4elocation into the na4igation system to +ro4ide a target for the 2S/,s bell offset d*ringmo4ement on 2P5

2*ring gro*t bag installation9 the di4ers laying the bags will initially be +ositioned onthe seabed >as re=*ested by the di4e s*+erintendent? by 7S;L interrogation of hand-held mini-trans+onders5 The s*bse=*ent +ositioning at each site may be +erformed bydi4ers, ta+ed meas*rements from the initial bag installation5

*)+ As/! ilt S rve<

The +*r+ose of this s*r4ey is to ac=*ire data to determine the +osition and alignmentof the gro*t bags for *se in the final as-b*ilt alignment sheets and re+ort5

7+on com+letion of the installation at each crossing9 the di4er will ta6e the hand-heldtrans+onder to the extremities of the gro*t bag arrays to confirm their +osition andorientation5


22/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE ++ 6 74

*)7 Fiel; Re%orti">

0 +reliminary field re+ort will be s*bmitted onboard the s*r4ey 4essel after com+letion of the s*r4ey o+erations5 The +reliminary re+ort will be incl*si4e of themain res*lts of the s*r4ey9 and in +artic*lar those that co*ld create the need for remedial actions5 )t sho*ld contain the following

!5 )ntrod*ctionN(5 Sco+e of Aor6N"5 2escri+tion of o+erationsN&5 S*mmary of +reliminary s*r4ey res*ltsN'5 S*rface +ositioning and s*b-s*rface +ositioningN

5 .ote on e=*i+ment +erformance incl*ding +ositioning BCN5 Se=*ence of Significant E4entsN

$5 Mobilisation9 trials and calibration res*lts incl*ding the following- /elocity sensor calibration certificatesN- Statement of 3eadinessN- 2GPS 4erification res*ltsN- Offset meas*rements and diagramN- Gyrocom+ass calibration and chec6 res*ltsN- S*rface and 7S;L system set-*+ +arametersN- Personnel and e=*i+ment listsN#5 @ealth9 Safety and En4ironment 3e+ortN! 5 Chart and 2rawing )ndexN!!5 Com+leted Chec6 ListsN!(5 Concl*sions and recommendations5


23/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE +7 6 74

? E@UIPMENT LIST

The e=*i+ment listed below will be installed and interfaced onboard the 2S/

Ite. O"li"e S%#reThales GeoSol*tions S6yTrimble MS ' ?

)nmarsat 2emod*latorsM*lti


24/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE +4 6 74

3 APPENDICES

3): E i%.e"t Mo!ilis#tio" Chec List

The following are to be chec6ed and signed off d*ring mobilisation on com+letion of each item5

Ite. N Ite. Co.%lete;$ &

Ti.e6D#te

! 2GPS f*nctional test differential recei4ed 4erification

( 7S;L system f*nctional test offsets meas*red calibration

" Gyrocom+ass f*nctional test latit*de and s+eed settings calibration

& On-line .a4igation System )nterfacing Offsets meas*red


25/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE +, 6 74

3)+ As/fo "; :-)?,= Te #co Pi%eli"e

The .iari determined the following co-ordinates for the ! 5 ': Texaco +i+elined*ring the +re-engineering and +re-lay s*r4ey *nderta6en on ($ October ( !

E#sti"> Northi"> Co..e"t!K "'( #$ (' "& Oloibiri Tan6 ( "'!#!( "$(('" "'!$$" "$"!'& "'!$&! "$&' "'!$ "$'

"'! "$ !("'! !' "# !! Crossing

$ "'! &' "#&# "'! ( "#

! "'! ! "#!! "'!'## "#$!( "'!'$ "##!"K ""'# '('" Middleton

K ta6en from C*stomer chart +## & ' 5


26/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE +* 6 74

3)7 As/fo "; :+)?,= Te #co Pi%eli"e

The .iari determined the following co-ordinates for the !(5 ': Texaco +i+elined*ring the +re-engineering and +re-lay s*r4ey *nderta6en on ($ October ( !

E#sti"> Northi"> Co..e"t

!K "'( #$ (' "& Oloibiri Tan6 ( " ! "# "!'" " !!## "! ( Crossing& " !("! "! &&'K " !& & & $ .orth 0+oi

K ta6en from C*stomer chart +## & ' 5


27/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE +? 6 74

3)4 As/fo "; :3= Te #co Pi%eli"e

The .iari determined the following co-ordinates for the !$: Texaco +i+eline d*ringthe +re-engineering and +re-lay s*r4ey *nderta6en on ($ October ( !


!K "'( #$ (' "& Oloibiri Tan6 ( " "'& (#&(" " " (#&''& " " (#&$' " "$ (#'!

" "# (#'&"" & (#'

$ " &! (## " &( (# "

! " &" (# $"!! " &" # (# $$ Crossing!( " && (# "(

!" " &' (# !!& " & (# #!!' " & (#$"!! " &$ (#$ #! " (##(!$ " ' (##&$!# " '! (##$( " '!' "(!K " '$(" "'$#'


28/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE +3 6 74

3), As/fo "; 7*= A>i% Pi%eli"e

The following co-ordinates for the " : 0gi+ +i+eline were determined by the .iarid*ring the +re-engineering and +re-lay s*r4ey *nderta6en on (# October ( !


! &($#' !! #(( &($#'# !(" &($#'# !(!& &($# ( !((' &($# !("

&($# !(&&($# !('

$ &($#'' !(# &($#&' !(

! &($#& !($!! &($#" !(#!( &($#"& !"!" &($#" !"!!& &($#($ !"!' Crossing!' &($#(' !"(! &($#( !""! &($#! !"&!$ &($#"! !"'!# &($# !"( &($#$ !"(! &(# ' !"$(( &(# ( !"#(" &(# && !&(& &(# & !&!


29/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE +2 6 74

3)* As/fo "; :+= A>i% Pi%eli"e

The following co-ordinates for the !(: 0gi+ +i+eline were determined by the .iarid*ring the +re-engineering and +re-lay s*r4ey *nderta6en on (# October ( !

Q E#sti"> Northi"> Co..e"t

! &(#! ' !("( &(#! !(&" &(#! !('& &(#! !(' &(#! !(

&(#! ' !($&(#! ' !(#

$ &(#! !"# &(#! ( !"!

! &(#! & !"!' Crossing!! &(#! $ !"(!( &(#!! !""

!" &(#!!" !"&!& &(#!!# !"'!' &(#!(' !"! &(#!(' !"! &(#!(" !"$!$ &(#!(( !"#!# &(#!( !&( &(#!!' !&!(! &(#!!' !&((( &(#!!! !&"(" &(#! $ !&&(& &(#! " !&'


30/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE 7- 6 74

3)? Post/l#< SYMP to DP/5 U.!ilic#l

The following co-ordinates for the S8MP to 2P-; 7mbilical were determined by the .iari d*ring the +ost-lay s*r4ey *nderta6en ( and ( E#sti"> Northi">! "( # ( $$ ! (' "(( " $$#( "( # $ $$ ! ( "(($'$ $$##"" "(! !$ $$ (& ( "((#(' $# $& "(! $& $$ "! ($ "((#$& $# !$' "(!!!" $$ "" (# "(" $# "

"(!! $$ && " "("!&" $# "(!('! $$ '! "! "("(&& $# $

$ "(!""" $$ & "( "("($' $# '# "(!&( $$ ! "" "(""& $# $$

! "(!'! $$ $ "& "("&!" $#! !!! "(! # $$ # "' "("' $#!!!( "(! $$$( " "(" # $#!&!" "(!$"( $$$($ " "(" & $#!&!& "(!$$ $$$"( "$ "(" $! $#! #!' "(!#"# $$$&! "# "("$ # $#!#! "(( "( $$$'& & "("#$! $#( $! "((!!' $$$ ! &! "(&!(( $#(!!$ "(((! $$$ ' &( "(&(& $#(!!# "(((# $$$$ &" "(&"!$ $#(( "(("&' $$$#" && "(&"#& $#!#'(! "((&"# $$#! &' "(&&$' $#! '(( "(( $$#(& & "(&'#! $#!'!(" "(('#$ $$#&( & "(& $#!!(& "(( ( $$#'$


31/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE 7: 6 74

3)3 Post/l#< :*= SYMP to DP/A

The following co-ordinates for the ! : S8MP to 2P-0 +i+eline were determined bythe .iari d*ring the +ost-lay s*r4ey *nderta6en ( and ( E#sti"> Northi">! "(!"#$5! $$ !5! (! "(($ $5& $$#$ 5#( "(!& '5 $$ !5# (( "((#"(5' $$##'5'" "(!' "5 $$ $'5 (" "(" "'5( $# !&5& "(! '$5' $$ #(5# (& "("! "5 $# " 5' "(! &$5 $$$ 5' (' "("( 5 $# '$5!

"(!$!$5$ $$$!&5# ( "(""! 5& $# "5"(!#!!5& $$$( 5# ( "(""#$5( $# $(5"

$ "(!# 5( $$$(#5( ($ "("&"$5& $# #(5!# "(( (5 $$$"#5 (# "("' 5 $#! 5"

! "(( &'5& $$$&'5& " "("' 5" $#!!(5!! "((! !5 $$$' 5 "! "(" 5# $#!(#5!( "((! #5" $$$' 5& "( "(" !$5" $#!&"5!" "((("$5$ $$$ 5 "" "(" !5! $#!' 5$!& "((" #5( $$$ 5" "& "("$( 5' $#! &5"!' "(("#'5& $$$#!5" "' "("#"#5! $#!$'5'! "((& 5$ $$# #5 " "(& '!5" $#!#"5! "(('"(5' $$#!$5" " "(&!& 5( $#!#'5!$ "(( (5$ $$#"!5 "$ "(&(&$5' $#!#!5!# "(( $!5$ $$#& 5( "# "(&"&&5 $#! #5( "(( '5# $$# &5( & "(&& (5( $#! $5&


32/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE 7+ 6 74

3)2 Post/l#< :3= SYMP to DP/A

The following co-ordinates for the !$: S8MP to 2P-0 +i+eline were determined bythe .iari d*ring the +ost-lay s*r4ey *nderta6en ( and ( E#sti"> Northi">! "( $ $5 $$ $#5" (( "(( &5# $$#! 5'( "(!!(&5' $$ (!5& (" "(( '5 $$#!#5&" "(!! (5# $$ ('5 (& "(($ 5! $$#"'5'& "(!" &5 $$ ( (' "((##!5 $$# 5!' "(!&&'5' $$ 5( ( "("! &5 $$#$$5#

"(!&$ 5( $$ 5' ( "(""("5' $# !!5$"(!'' 5 $$ (5 ($ "("&$&5! $# "$5$

$ "(! ' 5$ $$ $ 5# (# "("''$5 $# ' 5!# "(! ! 5! $$ #!5 " "(" & 5" $# '5$

! "(!$((5 $$$ "5' "! "(" &5! $# #!5&!! "(!# "5$ $$$!(5' "( "("#("5! $#!!"5$!( "(!# $5$ $$$((5& "" "(& " 5 $#!"!5'!" "(( "(5 $$$($5$ "& "(&! 5 $#!&&5(!& "((!""5' $$$&(5& "' "(&( 5( $#!'"5&!' "((('!5 $$$' 5# " "(&""$5' $#!&$5! "(("&'5" $$$ 5' " "(&&!'5( $#!&(5(! "(("#&5# $$$ '5# "$ "(&''(5$ $#!(!5$!$ "((&( 5 $$$$ 5" "# "(& & 5! $#! '5'!# "((&$'5 $$$$'5# & "(& !5 $# $'5( "(('(#5" $$$# 5$ &! "(&$ 5 $# $5'(! "(( (#5$ $$# "5$


33/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE 77 6 74

3):- Post/l#< :+= SYMP to DP/A

The following co-ordinates for the !(: S8MP to 2P-0 +i+eline were determined bythe .iari d*ring the +ost-lay s*r4ey *nderta6en ( and ( E#sti"> Northi">! "( $ &5 $$ $&5! (& "("' 5 $# !5"( "(!!' 5' $$ !#5( (' "(" &!5 $# 5" "(!" !5( $$ & 5" ( "(" "5# $# (!5"& "(!&"(5 $$ ' ( "("#('5$ $# &(5'' "(!'('5" $$ "5' ($ "(& ($5# $# '!5!

"(! " 5 $$ 5! (# "(&! 5& $# "5""(! "5& $$ #!5 " "(&((&5 $# $&5

$ "(!# "5( $$$ '5 "! "(&"!&5 $# $ 5'# "(( ( 5# $$$!#5 "( "(&'(!5 $#! &5$

! "((!("5 $$$" 5 "" "(& " 5# $# # 5(!! "((!$ 5 $$$" 5# "& "(& $5# $# 5!( "((($!5! $$$' "' "(&$ $5# $# ' 5(!" "((" "5( $$$ 5 " "(' &(5' $# &(5!!& "((&& 5 $$$ (5! " "('!'"5& $# "&5!' "(('"#5" $$$$(5 "$ "('""(5 $# ! 5#! "(( ' 5 $$$#'5( "# "(' 5' $$##!5! "(( !$5! $$# &5 & "('' (5 $$# 5'!$ "(( ##5( $$# #5 &! "(' !5! $$#" 5!!# "((#' $$#(#5" &( "('$($5 $$$$ 5$( "("!($5 $$#! &" "('#'!5 $$$& 5$(! "("('&5 $$# !5& && "( "#5$ $$$! 5$(( "(""'$5& $$# "5& &' "( (# 5 $$ " 5(" "("&"(5& $$#$"5&


34/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE 74 6 74

3):: NITEL FOC

The cables are laid as a +air9 each !(5$mm o*tside diameter5 They are re+orted to belaid side-by-side and b*ried at a de+th of ! metre below the seabed5

1P( 5#!?

E#sti"> Northi"> E#sti"> Northi">! (#$$(" !&'''# ( " !!($ !&&&$#( (#$#(! !&''!" ( " !!"! !&&" (## !! !&'& ($ " !(( !&&&&& (##! ( !&'&" (# " !"! !&&& &' (##!#! !&'"$ " " !& & !&&" "

(##($! !&'"&' "! " !" !&&"!#(##" !&'(## "( " !'$& !&&($!

$ (##&$! !&'(&$ "" " ! !&&("# (##'$ !&'( ( "& " ! !&&!#&

! (## $ !&'!'$ "' " !$'# !&&!'!! (## # !&'!! " " !#& !&&!!!( (##$ !&' ' " " ( "$ !&& #!" (###' !&' "! "$ " (!(# !&& (!& " &" !&#( "# " ((!# !&"#$'!' " !"" !&'& & " ("!( !&"#&&! " ((' !&!! &! " (& !&"#! " "! !&&$ # &( " (' !&"$'(!$ " & ' !&&$( &" " (' ' !&"$($!# " ' !&& $! && " ( ' !&" $&( " '$ !&& &( &' " ( && !&" &&(! " !&& & " ($" !&" ((( " !&& ' & " (#( !&" '#(" " $' !&& !' &$ " " !$ !&" !'(& " #' !&&' " " "! $ !&"' '(' " ! & !&&'"!

.)TEL cable as-laid co-ordinates at second crossing of (&: >1P '5$!?Q E#sti"> Northi"> Q E#sti"> Northi">


35/35


De%#rt.e"t(

SURVEY

Revisio"(-


Doc .e"t Title(



OG-00-1-(#$&

PAGE 7, 6 74

! "! ( ##' " "! "!$""( # $ $( "! (# ##&$! "( "!$" # $&" "! ""& ##"$# "" "!$& & # #(& "! " " ##(# "& "!$&&" #' "! & ##( " "' "!$&$ # '

"! &&& ##! # " "!$'!" # &!("! &$! ## !' " "!$''( # "!$

$ "! '!$ #$#(" "$ "!$'$# # ((# "! ''' #$$(# "# "!$ (" # !"(

! "! '# #$ " & "!$ ( # &!! "! (# #$ &" &! "!$ ## #'#&$!( "! & #$''! &( "!$ "$ #'$'&!" "! " #$&'$ &" "!$ ' #' (!& "! & #$" && "!$$! #' $!' "! #$( ( &' "!$$ #'' $! "! $!! #$! # & "!$$$( #'&$(! "! $'( #$ $ & "!$#(! #'"#!$ "! $$ # ##( &$ "!$#' #'(#!# "! #(( # $## "!$##' #'( &( "! # " # $ $ ' "!# "! #'!!

(! "! ##$ # !& '! "!#"#$ #&!$((( "!$ " # (( '( "!# $ #"('!(" "!$ ( # '($ '" "( !"& #("(!(& "!$! # # &" '& "( ' " #!"#!(' "!$!&$ # "&( '' "( $ ( # & "( "!$!$( # (&$ ' "(!(& $# !#( "!$(( # !' ' "(!'"' $$ $$($ "!$((# # !"" '$ "(! ! $$ ((# "!$(' # ( '# "(!# $ $ &" "!$(#" # # "(("& $ &(

END OF DOCUMENT

Documents

DSV Positioning and Survey Procedures OG-AA-K-2984 REV 0