601/ Anchor Handling and Towing Operations Procedure / 992
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
I
t
i
s
unsafe
to
shorten
up
on
the
wor
k
w
i
re
(i.
e
.
heave
i
n
on
the
vesse
l
w
i
nch
,
unt
il
the
vesse
l
stern ro
ll
er
i
s
vert
i
ca
ll
y
above
the
anchor
pos
i
t
i
on
) i
n
an
attempt
to
brea
k
out
an
anchor
. D
o
i
ng
so
i
s
li
ab
l
e
to
cause
the w
i
re
,
the w
i
nch
,
the anchor
or
other
e
q
u
i
pment
to
fa
il.
Under
the
soa
ki
ng
test
i
t
has
been
c
l
ear
l
y
shown
that
d
il
atancy
(
d
il
atancy
i
s
the
tendency
of
a
substance
to
become
more
v
i
scous
or
so
li
d
when
affected
by
an
outs
i
de
force
or
ag
i
tat
i
on
)
promotes
the
ho
l
d
i
ng
capac
i
ty
of
an
anchor
. T
he
same
phenomenon
obstructs
the
brea
ki
ng
out
of
the anchors
.
B
rea
ki
ng
out
forces
i
s
caused
by
the
vo
l
ume
of
the
so
il
on
the
f
l
u
k
e
and
the
suc
ki
ng
or
under
-
pressure
be
l
ow
i
t
.
Pu
lli
ng
up
the
anchor
i
ncreases
the
so
il
res
i
stance
due
to
the
so
il
's
d
il
ettante
behav
i
our
. T
h
i
s
res
i
stance
decreases w
i
th
t
i
me
,
reduc
i
ng
the
negat
i
ve
pressure
and
thus
eas
i
ng
the brea
k
out
.
T
he movement
of
the
vesse
l
due
to w
i
nd
and waves
i
s
reduced
by
th
i
s
anchor
tens
i
on wh
il
e
the
same movement
s
l
ow
l
y brea
k
s
out
the anchor
,
a
ll
ow
i
ng
the
above phenomenon
to occur
.
R
e
l
at
i
ve Vector
F
orces
i
n Anchor
R
ecovery:
T
he
d
i
agram
shows
the
re
l
at
i
ve
vector
forces
for
anchor
remova
l
w
i
th
re
l
at
i
on
to
vesse
l
pos
i
t
i
on
and water
depth
.
I
n
th
i
s
ill
ustrat
i
on 5
0 i
s
the m
i
n
i
mum
brea
k l
oose
force and
opt
i
mum
d
i
rect
i
on
.
T
he
vectors
show
the
s
i
gn
i
f
i
cant
l
y
i
ncreased
force
re
q
u
i
red as
the
vesse
l
nears
the
vert
i
ca
l
pu
ll.
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
25
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
.
601