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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

x

T

he presence of

actua

l

and

corrected

charts

and other

re

l

evant

pub

li

cat

i

ons

for

nav

i

gat

i

on

.

x

Even

i

f

sa

ili

ng

routes

and

p

l

ans

are

rece

i

ved

from

the

r

i

g

,

the

Master

has

the

respons

i

b

ili

ty

to

contro

l

and

eva

l

uate

i

f

the

operat

i

on

i

s

w

i

th

i

n

norma

l

operat

i

ona

l li

m

i

ts

,

and

i

f

the

sa

ili

ng

route

i

s

nav

i

gat

i

ona

l

safe

.

x

K

eep

a

safe

d

i

stance

from

any

offshore

i

nsta

ll

at

i

ons

;

preferab

l

y

f

i

ve

naut

i

ca

l

m

il

es

i

n

the

open

sea

.

Pass

on

the

s

i

de

that

prov

i

des

the

best

assurance

that

the

tow w

ill

dr

i

ft

away

from

the

i

nsta

ll

at

i

on

i

n

case of

a b

l

ac

k-

out or

the

tow

li

ne

brea

k

s

.

x

W

eather

reports

shall

be

obta

i

ned

regu

l

ar

l

y

. T

he

weather

cr

i

ter

i

a

and

necessary

weather

w

i

ndow

for

the

tow

shall

be def

i

ned

.

x

T

he need

for

support

vesse

l

s

shall

be eva

l

uated

.

T

he

fo

ll

ow

i

ng

app

li

es w

i

th

regard

to

the

use

of

any

support

vesse

l

s

a

l

ong

the

tow

i

ng

route

for

traff

i

c

contro

l

and

ass

i

stance

through

the

voyage

. (T

he

i

nsta

ll

at

i

on's

standby

vesse

l

may

be

used

as

a

support

vesse

l, i

f

ava

il

ab

l

e

,

or

an

anchor

-

hand

li

ng

vesse

l

that

has

to

fo

ll

ow

the

tow

to

the

ne

x

t

anchorage

.) I

f

a

support

vesse

l i

s

used

i

ts

tas

k

s

should

i

nc

l

ude

,

but not be

li

m

i

ted

to:

-

Mon

i

tor

i

ng

and

p

l

ott

i

ng

a

ll

sh

i

p

traff

i

c

a

l

ong

the

tow

i

ng

route

.

- I

ntercept

i

ng

any

vesse

l

that moves

too

c

l

ose

to

the

tow

.

-

Chec

ki

ng

that

the

anchor

i

ng

s

i

te

i

s

c

l

ear

and

free

of

permanent

f

i

sh

i

ng

gear

before

the

i

nsta

ll

at

i

on arr

i

ves

.

- F

unct

i

on

i

ng as

a bac

k-

up

tow

i

ng

vesse

l, i

f

the

vesse

l i

s

r

i

gged

for

th

i

s

type

of

j

ob

.

B) Towing

T

he be

l

ow

i

s meant

to

be

gu

i

dance and

i

nc

l

udes

a

summary of

act

i

ons

dur

i

ng

tow

i

ng

operat

i

ons

.

x

T

he

tow

i

ng gear

from

the

r

i

g

to

be

secured

i

n

the w

i

re

stopper

.

x

T

he w

i

re

and

the

tow

i

ng

gear

to

be

connected w

i

th

an

ade

q

uate

shac

kl

e or

other

su

i

tab

l

e/ade

q

uate

connect

i

ng

dev

i

ces

.

x

T

he

tens

i

on

contro

l

to

be

set

to

the

l

owest

l

eve

l.

x

T

he w

i

nch

to

be

operated

i

n h

i

gh

speed mode

.

x

After

connect

i

on

,

tens

i

on

up

the w

i

re

.

x

L

ower

the

tow

i

ng

p

i

ns

,

and

open

the w

i

re

stopper

.

I

n good weather

,

a

reasonab

l

e w

i

re

l

ength

i

s

appro

xi

mate

l

y

700

to

800

meters

.

I

n

rough weather

,

a w

i

re

l

ength

of

up

to

1200-1

5

00

mtrs may be

necessary

.

However

,

water

depth and

app

li

ed

tens

i

on/power

should

a

l

ways

be

ta

k

en

i

nto account

. T

ow w

i

re

should

not

be a

ll

owed

to

touch

the

seabed

.

W

hen

the

tow

i

ng operat

i

on

i

s

ready

to

commence

,

the

Master

can e

i

ther:

x

Act

i

vate

the Automat

i

c

D

ynam

i

c

T

ow

i

ng

funct

i

on

(i

f

f

i

tted

).

x

Put

on

the w

i

nch

bra

k

e

,

stop a

ll

hydrau

li

c

pumps

and

act

i

vate

the

l

ong

-

t

i

me

tow

i

ng

funct

i

on

.

x

Ad

j

ust

the

tens

i

on

contro

l

to

a

su

i

tab

l

e

sett

i

ng

and

l

oosen

w

i

nch

bra

k

e

. I

f

pressure

i

n

hydrau

li

c

motors

e

x

ceeds

the

pre

-

set

li

m

i

t

the w

i

nch

w

ill

render

. T

h

i

s way

i

t

i

s

poss

i

b

l

e

to

ta

k

e

spec

i

a

l

care

about how powerfu

l

stra

i

n

you get on

the w

i

re

.

N

ote:

W

hen

the

hydrau

li

c

pumps

and

servo

un

i

t

i

s

stopped

,

the

o

il

pressure

i

n

the

servo

un

i

t may

l

ea

k. I

t

i

s

adv

i

sab

l

e

to

start

the

servo

pump

for a m

i

nute once per

hour

or

to act

i

vate

the

l

ong

-

t

i

me

tow

i

ng

funct

i

on

.

I

n

tow

i

ng

operat

i

ons

that

l

asts

for

a

l

ong

per

i

od

of

t

i

me

, i

t

i

s

i

mportant

fre

q

uent

l

y

to

g

i

ve

out

or

hau

l i

n

on

the w

i

re

i

n order

to

prevent

abras

i

on at

the

stern

ro

ll

er

.

Vers

i

on

SF(BOS-

P

RD-0701.000

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

48

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

.

624