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Vessel Stabilit

y

BOS-

P

RD-2

6

.900

6

01

4

.1.

3

Si

m

p

li

f

ie

d c

al

c

u

lati

on

s

W

hen

us

i

n

g

s

i

m

p

li

f

i

ed

ca

l

cu

l

at

i

ons

,

the

Maste

r

shall

ensure

that

the

vesse

l

vert

i

ca

l

he

i

g

ht

of

the

centre

of

g

rav

i

ty

(

VC

G

or

KG)

fa

ll

s

on

or

be

l

o

w

the ma

xi

mum

a

ll

o

w

ed ma

x

Vert

i

ca

l

Centre

of

G

rav

i

ty

(

VC

G)

curves

or

tab

l

es

and

that

the draft at

the

l

oad

li

ne mar

k i

s

not e

x

ceeded

.

VC

G

curves

are

a

set

of

curves

for

var

i

ous

comb

i

nat

i

ons

of

d

i

s

p

l

acements

and

tr

i

ms

and can

be

ca

l

cu

l

ated

sho

w

i

n

g

VC

G

for

w

h

i

ch

a

ll

re

q

u

i

red

cr

i

ter

i

a

are

sat

i

sf

i

ed

. T

hey

do

not

ta

k

e

i

nto

account

any

free

surface

effect

so

the

actua

l l

oad

i

n

g

case

VC

G

va

l

ue

shall

be

corrected

for

the

free

surface moment

before

be

i

n

g

com

p

ared

w

i

th

the

curve

.

4

.1.

4

F

u

ll

d

i

r

e

c

t

c

al

c

u

lati

on

s

I

f

the

Maste

r

has

any

doubts

about

the

s

i

m

p

li

f

i

ed

assessment

or

f

i

nds actua

l

VC

G

c

l

ose

to

the

VC

G

ma

xi

mum

,

a

fu

ll

d

i

rect

ca

l

cu

l

at

i

on

shall

be

carr

i

ed

out

by

manua

l

ca

l

cu

l

at

i

ons

us

i

n

g

tan

k

tab

l

es

and

hydrostat

i

c

data

. W

hen

l

oad

i

n

g

soft

w

are

i

s

p

rov

i

ded

on

board

, i

t

should

be

used

i

n

p

l

ace

of

manua

l

ca

l

cu

l

at

i

ons

.

B

efore

carry

i

n

g

heavy

l

oads

,

p

erform

i

n

g

crane

or

anchor

hand

li

n

g

o

p

erat

i

ons

and

any

other

o

p

erat

i

on

w

i

th

p

otent

i

a

l

to

have

a

severe

effect

on

the

vesse

l,

s

p

ec

i

a

l

stab

ili

ty

ca

l

cu

l

at

i

ons

shall

be

carr

i

ed

out

to

ensure

that

the

cond

i

t

i

on

fu

l

f

il

s

the

stab

ili

ty

cr

i

ter

i

on

.

A

ny

l

oad

i

n

g

cond

i

t

i

on

ca

l

cu

l

ated by

the

Maste

r

shall

com

p

l

y

w

i

th

the

li

m

i

t

i

n

g

cr

i

ter

i

a

.

4

.1.

5 L

o

a

d

i

ng

s

o

f

twa

r

e

f

o

r

stabilit

y

c

al

c

u

lati

on

s

A

ll

vesse

l

s

(

other

than

cre

w

boats

)

shall

be

e

q

u

i

pp

ed

w

i

th

l

oad

i

n

g

soft

w

are

for

stab

ili

ty

ca

l

cu

l

at

i

ons

. T

he

soft

w

are

shall

match

w

i

th

current

a

pp

li

cab

l

e

statutory

and

c

l

ass

re

q

u

i

rements

. I

n

p

art

i

cu

l

ar

,

soft

w

are

,

ca

l

cu

l

at

i

ons

and

i

nsta

ll

at

i

on

on board

shall

be

sub

j

ect

to C

l

ass

rev

i

e

w

and

a

pp

rova

l.

4

.1.

6

Stabilit

y

s

o

f

twa

r

e i

n

stallati

on

a

nd

u

se

T

he

l

oad

i

n

g

soft

w

are

shall

be

i

nsta

ll

ed on

board

w

i

th

a

redundancy

.

H

ard

w

are

i

s

not

sub

j

ect

to C

l

ass

a

pp

rova

l

p

rov

i

d

i

n

g

that

the

redundancy

can be demonstrated

.

P

erformance

of

the

l

oad

i

n

g

soft

w

are

i

s

i

nc

l

uded

i

n

c

l

ass

survey

sco

p

e

.

C

l

ass

a

pp

rova

l i

s

sub

j

ect

to

c

l

ass

to

l

erances

re

g

ard

i

n

g

d

i

fferences

bet

w

een

soft

w

are

resu

l

ts

and

fu

ll

d

i

rect

ca

l

cu

l

at

i

ons

resu

l

ts

.

T

he

system

shall

be

tested

a

g

a

i

nst

C

l

ass

a

pp

roved

L

oad

i

n

g

Cond

i

t

i

ons

on

a re

g

u

l

ar

bas

i

s

to

ensure

o

p

erat

i

ona

l

com

p

li

ance

,

accuracy

and

p

erformance

standards

.

A

fter

i

nsta

ll

at

i

on

,

the

a

pp

roved

l

oad

i

n

g

cond

i

t

i

ons

are

to be

ca

l

cu

l

ated onboard by

the

vesse

l’

s

p

ersonne

l

w

i

th a

c

l

ass

soc

i

ety

surveyor

.

L

oad

test

i

n

g

i

s

the

p

rocess

of

p

utt

i

n

g

demand

on

a

system

or

dev

i

ce

and

measur

i

n

g

i

ts

res

p

onse

. L

oad

test

i

n

g

i

s

p

erformed

to

determ

i

ne

a

system

’

s behav

i

our under

both

norma

l

and

ant

i

c

i

p

ated

p

ea

k l

oad

cond

i

t

i

ons

.

R

ecords

of

the

tests

shall

be ma

i

nta

i

ned

. T

he

t

i

me

and

re

l

evant

deta

il

s

of

a

ll

stab

ili

ty

ca

l

cu

l

at

i

ons

shall

be

c

l

ear

l

y

recorded

i

n

the

vesse

l’

s

l

o

g

boo

k.

S

oft

w

are manufacturers may

d

i

ffer

bet

w

een

vesse

l

ty

p

es

and

therefore

the

soft

w

are manufacturer

reference

manua

l

and

i

nte

g

rated

‘

H

E

L

P

’

menu

shall

be

used

for

g

u

i

dance

on

com

p

l

et

i

n

g

stab

ili

ty

ca

l

cu

l

at

i

ons

and

assessments

.

T

he

system

shall

be

used

w

henever

a

stab

ili

ty

ca

l

cu

l

at

i

on

i

s

re

q

u

i

red

and

the

resu

l

ts

com

p

ared

w

i

th

the

resu

l

ts

from

the

Stability Booklet

.

Vers

i

on

S

F

(BOS-

P

RD-0

7

.900

6

01-

ver

.0

4

). O

r

i

g

i

na

l

date

: 22/0

6

/2012.

Vers

i

on

date

:

3

1/12/201

5

.

Va

li

d

vers

i

on

on

l

y

on QM

S

s

i

te

.

Uncontro

ll

ed

document

w

hen

p

r

i

nted

.

P

rocedure

p

re

p

ared by

: BOS

H

ead

of

O

p

erat

i

ons

.

App

roved

by

: BOS

H

ead

of

O

p

erat

i

ons

.

Va

li

dated by

: BOS

Qua

li

ty

R

e

p

resentat

i

ve

.

6

/ 1

3

340