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Page Background

A

nc

h

or

H

andlin

g

and To

w

in

g

O

p

erations

P

rocedure

BOS-

P

RD-2

6

.900

6

14

A

ll

steps

deve

l

oped

above

i

n

the

sect

i

on

4.2.1.8Deployment 1

st

method

have

to

be

cons

i

dered

,

but we

shall

k

eep

i

n m

i

nd

the

fo

ll

ow

i

ng:

x

Anchor

to be dec

k

ed

;

x

B

oth

anchor

li

nes

part

connected

together

(

Vesse

l

and M

O

U parts

);

x

W

hen

the

connect

i

on

i

s

done

,

the

r

i

g

and

the

vesse

l

w

ill

now

commence

pay

i

ng

out w

i

re

s

i

mu

l

taneous

l

y

to

dep

l

oy

e

q

ua

l l

engths

of

w

i

re

i

n

order

to

share

the

l

oad

of

the moor

i

ng

system

.

x

G

ood

commun

i

cat

i

on

between

anchor

hand

li

ng

vesse

l

and

the

r

i

g

w

ill

be

conducted

to

ensure

that

e

q

ua

l

payout

rate

i

s

ma

i

nta

i

ned

between

the

r

i

g

and

the

anchor

hand

li

ng

vesse

l. F

o

ll

ow

i

ng

i

nstruct

i

ons

from

barge

Master

,

the

vesse

l

w

ill

ma

i

nta

i

n

suff

i

c

i

ent

bo

ll

ard

pu

ll

to

k

eep

r

i

g

’

s moor

i

ng w

i

re

from

rubb

i

ng

on

the

r

i

g

’

s

anchor

bo

l

ster

.

x

W

hen

the

r

i

g

and

the

vesse

l

w

ill

have

suff

i

c

i

ent

l

ength

of

w

i

re

dep

l

oyed

overboard

,

the

w

i

re

payout

operat

i

ons

w

ill

cease

and

the

anchor

hand

li

ng

vesse

l

w

ill

app

l

y

necessary

tens

i

on

to

stretch

the

r

i

g

’

s moor

i

ng

system

.

x

Anchor w

ill

be

connected

.

x

O

nce

the

system

has

been

suff

i

c

i

ent

l

y

stretched

,

the

anchor

hand

li

ng

vesse

l

w

ill

reduce

to

m

i

n

i

mum

power/bo

ll

ard

pu

ll

a

ll

ow

i

ng

the

we

i

ght

of

the

catenary

system

to

set

the

anchor

on

the

bottom

. T

he

vesse

l

w

ill

not

i

fy

the

r

i

g when

the

anchor

i

s

on

the

bottom

. N

o

e

x

tra pu

ll

w

ill

be app

li

ed once

the

anchor

i

s

on

the

bottom

.

x

W

hen

the

r

i

g

has

ach

i

eved

suff

i

c

i

ent

tens

i

on

on

the

anchor

w

i

nch/r

i

g

cha

i

n

,

the

vesse

l

can

start

tow

i

ng

the

chaser

bac

k

to

the

r

i

g

.

x

S

ome

r

i

gs

use a

connector

to

connect

the w

i

re and

the

cha

i

n

together

. T

he

connector

can

be d

i

ff

i

cu

l

t

to

pass

. T

he

chaser

r

i

ng w

ill

stop

i

n

the

connector

. T

he

best way

to

pass

th

i

s

i

s

to

heave

i

n

on

the

wor

k

w

i

re

. T

he

vesse

l i

s

p

l

aced

over

the

connector

.

Heave

i

n

on

the

w

i

re

to

water

depth

. G

o

bac

k

towards

the

anchor

unt

il

the

vesse

l i

s

appro

xi

mate

l

y

200

meters

from

the

connector

. T

hen

the

vesse

l

starts

to

chase

bac

k

to

the

r

i

g

. T

he

chaser

r

i

ng w

ill

pass

the

connector

. K

eep

the

same

l

ength

on

the wor

k

w

i

re

.

4.2.1.10 Decking anchor

W

hen

i

t

’

s

re

q

uested

from

the

c

li

ent

to

br

i

ng

the

anchor

on

dec

k,

there

are

norma

ll

y

2

d

i

fferent

operat

i

ons

depend

i

ng

on

i

f

i

t

’

s

d

i

rect

l

y

from

the

rac

k

on

the

r

i

g

or

i

f

i

t

’

s

from

the

bottom

at

the

end

of

an

anchor

li

ne

system

.

A) First operation: Decking the anchor from the rig.

x

Connect

the PCP

to

the wor

k

w

i

re

.

x

Manoeuvre

the

sh

i

p

i

n

li

ne

w

i

th

the

anchor

and

k

eep

a

constant

tens

i

on

of

appro

x. 20-

40T.

x

T

he

r

i

g w

ill

pay out about

1

5

0-200

mtr

of

cha

i

n

.

x

Heave

i

n on

the wor

k

w

i

re

unt

il

the anchor

i

s

j

ust be

l

ow

the

stern

ro

ll

er

.

x

S

top/reduce

the

thrust

j

ust

before

the

anchor

passes

the prope

ll

er wash

.

x

Pu

ll

anchor

on

the

stern

ro

ll

er

,

a

ll

ow

the

anchor

to

turn

w

i

th

i

ts

bac

k

on

the

ro

ll

er

,

f

l

u

k

e

po

i

nts

up

. T

hen

pu

ll

further

on

dec

k .W

hen

the

anchor

i

s

on

dec

k, l

ays

on

i

ts

bac

k

w

i

th

shac

kl

e

towards

vesse

l’

s

cab

l

e between

the upwards

d

i

rected

f

l

u

k

e po

i

nts

.

Vers

i

on

SF(BOS-

P

RD-0

7

01.000

5

-

ver

.

C

R). O

r

i

g

i

na

l D

ate:

3

1

/

12

/

201

5

.

Vers

i

on

D

ate:

N

/A

.

Va

li

d

vers

i

on

on

l

y on QM

S

s

i

te

.

Page

32

of

60

Procedure prepared by:

BOS

Head

of

O

perat

i

ons

.

Approved

by:

BOS

Head

of

O

perat

i

ons

.

Va

li

dated by:

BOS

Qua

li

ty

R

epresentat

i

ve

.

608