DNV Marine Operations’ Rules for Subsea Lift Operations Simplified Methods for Prediction of Hydrodynamic Forces Tormod Bøe DNV Marine Operations 1st December 2010
3 - DNV Rules for Marine Operations
Oct 26, 2014
DNV RPH103
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
DN
V M
arin
e O
pera
tions
’Rul
es
for S
ubse
a Li
ft O
pera
tions
Sim
plifi
ed M
etho
ds fo
r Pre
dict
ion
of H
ydro
dyna
mic
For
ces
Torm
od B
øeD
NV
Mar
ine
Ope
ratio
ns1s
t Dec
embe
r 201
0
Con
tent
Brie
f ove
rvie
w o
f rel
evan
t DN
V p
ublic
atio
ns
DN
V R
ules
for M
arin
e O
pera
tions
, 199
6,
Pt.2
Ch.
5 L
iftin
g –
Cap
acity
Che
cks
Sim
plifi
ed M
etho
ds fo
r pre
dict
ion
of H
ydro
dyna
mic
For
ces
oin
Spl
ash
Zone
, DN
V-R
P-H
103
Ch.
4
oin
Dee
pwat
er, D
NV
-RP
-H10
3 C
h.5
1. D
ecem
ber 2
010
Slid
e 2
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Rel
evan
t DN
V P
ublic
atio
ns
Lifti
ng-a
nd s
ubse
a op
erat
ions
:
DN
V-O
S-E4
02
Offs
hore
St
anda
rd fo
r Div
ing
Syst
ems
O
ctob
er 2
010
DN
V R
ules
for P
lann
ing
and
Exec
utio
n of
M
arin
e O
pera
tions
–19
96
’Spe
cial
pla
nned
, non
-rou
tine
oper
atio
ns o
f lim
ited
dura
tions
, at s
ea. M
arin
e op
erat
ions
are
norm
ally
rela
ted
to te
mpo
rary
pha
ses
as e
.g.
load
tran
sfer
, tra
nspo
rtatio
n an
d in
stal
latio
n.’
DN
V St
anda
rd fo
r Cer
tific
atio
nN
o.2.
22
Lifti
ng A
pplia
nces
Oct
ober
200
8
DN
V St
anda
rd fo
r Cer
tific
atio
nN
o. 2
.7-3
Port
able
Offs
hore
U
nits
June
200
6 (N
ew re
visi
on is
com
ing)
Spec
ial p
lann
ed n
on-r
outin
e op
erat
ions
Rou
tine
oper
atio
ns
1. D
ecem
ber 2
010
Slid
e 3
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Rel
evan
t DN
V P
ublic
atio
ns -
Oth
er
DN
V-R
P-C
205
Env
ironm
enta
l Con
ditio
ns
and
Env
ironm
enta
l Loa
dsO
ctob
er 2
010
DN
V-R
P-H
101
Ris
k M
anag
emen
tin
Mar
ine
and
Sub
sea
Ope
ratio
ns, J
anua
ry 2
003
DN
V-R
P-H
102
Mar
ine
Ope
ratio
ns d
urin
g R
emov
al o
f Offs
hore
Inst
alla
tions
, Apr
il 20
04
DN
V-R
P-H
103
Mod
ellin
g an
d A
naly
sis
of
Mar
ine
Ope
ratio
ns, A
pril
2010
1. D
ecem
ber 2
010
Slid
e 4
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Rel
evan
t DN
V P
ublic
atio
ns -
Web
Site
Mos
t DN
V p
ublic
atio
ns c
an b
e do
wnl
oade
d fo
r fre
eat
:
http
://w
ebsh
op.d
nv.c
om/g
loba
l/
The
1996
DN
V R
ules
for M
arin
e O
pera
tions
is n
ot in
the
Web
shop
.
1. D
ecem
ber 2
010
Slid
e 5
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Con
tent
Brie
f ove
rvie
w o
f rel
evan
t DN
V p
ublic
atio
ns
DN
V R
ules
for M
arin
e O
pera
tions
, 199
6,
Pt.2
Ch.
5 L
iftin
g –
Cap
acity
Che
cks
Sim
plifi
ed M
etho
ds fo
r pre
dict
ion
of H
ydro
dyna
mic
For
ces
oin
Spl
ash
Zone
, DN
V-R
P-H
103
Ch.
4
oin
Dee
pwat
er, D
NV
-RP
-H10
3 C
h.5
1. D
ecem
ber 2
010
Slid
e 6
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Cap
acity
Che
cks -
DN
V 1
996
Rul
es
Rul
es fo
r Pla
nnin
g an
d Ex
ecut
ion
of M
arin
e O
pera
tions
, 199
6
Part
1 -
Gen
eral
Pt.1
Ch.
1 -W
arra
nty
Surv
eys
Pt.1
Ch.
2 -P
lann
ing
of
Ope
ratio
nsPt
.1 C
h.3
-Des
ign
Load
sPt
.1 C
h.4
-Str
uctu
ral D
esig
n
Part
2 -
Ope
ratio
n Sp
ecifi
c R
equi
rem
ents
Pt.2
Ch.
1 -L
oad
Tran
sfer
Ope
ratio
nsPt
.2 C
h.2
-Tow
ing
Pt.2
Ch.
3 -S
peci
al S
ea T
rans
port
sPt
.2 C
h.4
-Offs
hore
Inst
alla
tion
Pt.2
Ch.
5 -L
iftin
gPt
.2 C
h.6
-Sub
Sea
Ope
ratio
nsPt
.2 C
h.7
-Tra
nsit
and
Posi
tioni
ng
of
Mob
ile O
ffsho
re U
nits
1. D
ecem
ber 2
010
Slid
e 7
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Cap
acity
Che
cks -
DN
V 1
996
Rul
es
Part
2
Cha
pter
5
Dyn
amic
load
s, li
ft in
air
Cra
ne c
apac
ity
Rig
ging
cap
acity
,(s
lings
, sha
ckle
s, e
tc.)
Stru
ctur
al s
teel
cap
acity
(lifte
d ob
ject
, lift
ing
poin
ts,
spre
ader
bar
s, e
tc.)
Part
2
Cha
pter
6D
ynam
ic lo
ads,
sub
sea
lifts
(c
apac
ity c
heck
s as
in C
hapt
er 5
app
lyin
g dy
nam
ic lo
ads
from
Cha
pter
6)
1. D
ecem
ber 2
010
Slid
e 8
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Cap
acity
Che
cks –
DA
F fo
r Lift
in A
ir
Dyn
amic
load
s ar
e ac
coun
ted
for b
y us
ing
a D
ynam
ic A
mpl
ifica
tion
Fact
or
(DA
F).
DA
F in
air
may
be
caus
ed b
y e.
g.
varia
tion
in h
oist
ing
spee
ds o
r mot
ions
of
cra
ne v
esse
l and
lifte
d ob
ject
.
The
give
n ta
ble
is a
pplic
able
for
offs
hore
lift
in a
ir in
min
or s
ea s
tate
s,
typi
cally
Hs
< 2-
2.5m
.
DA
F m
ust b
e es
timat
ed s
epar
atel
y fo
r lif
ts in
air
at h
ighe
r sea
stat
es a
nd fo
r su
bsea
lifts
!
Tabl
e 2.
1 P
t.2 C
h.5
Sec
.2.2
.4.4
1. D
ecem
ber 2
010
Slid
e 9
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Cap
acity
Che
cks -
Cra
ne C
apac
ity
The
dyna
mic
hoo
k lo
ad, D
HL,
is
give
n by
:
DH
L =
DA
F*(W
+Wrig
) + F
(SPL
)
ref.
Pt.2
Ch.
5 S
ec.2
.4.2
.1
W is
the
wei
ght o
f the
stru
ctur
e,
incl
udin
g a
wei
ght i
nacc
urac
y fa
ctor
The
DH
L sh
ould
be
chec
ked
agai
nst
avai
labl
e cr
ane
capa
city
The
cran
e ca
paci
ty d
ecre
ase
whe
n th
e lif
ting
radi
us in
crea
se.
1. D
ecem
ber 2
010
Slid
e 10
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Cap
acity
Che
cks -
Slin
g Lo
ads
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
nsSl
ide
111.
Dec
embe
r 201
0
The
max
imum
dyn
amic
slin
g lo
ad, F
slin
g,
can
be c
alcu
late
d by
:
Fslin
g=
DH
L·SK
L·kC
oG·D
W/ s
in φ
ref.
Pt.2
Ch.
5 S
ec.2
.4.2
.3-6
whe
re:
SKL
= Sk
ew lo
ad fa
ctor
→ex
tra lo
adin
g ca
used
by
equi
pmen
t and
fabr
icat
ion
tole
ranc
es.
kCoG
= C
oG fa
ctor
→in
accu
raci
es in
est
imat
ed
posi
tion
of c
entre
of g
ravi
ty.
DW
= ve
rtic
al w
eigh
t dis
trib
utio
n→
e.g.
D
WA
= (8
/15)
·(7/1
3) i
n sl
ing
A.
φ=
slin
g an
gle
from
the
horiz
onta
l pla
ne.
Exa
mpl
e :
Cap
acity
Che
cks -
Slin
gs a
nd S
hack
les
The
slin
g ca
paci
ty ”M
inim
um b
reak
ing
load
”, M
BL,
is c
heck
ed b
y:
The
safe
ty fa
ctor
is m
inim
umγs
f≥
3.0.
( P
t.2 C
h.5
Sec
.3.1
.2)
sfsling
sling
γMBL
F<
”Saf
e w
orki
ng lo
ad”,
SWL,
and
”M
BL,
of t
he
shac
kle
are
chec
ked
by :
a)
F slin
g<
SW
L·D
AF
and
b)
F slin
g<
MB
L / 3
.3
Bot
h cr
iteria
sha
ll be
fulfi
lled
(Pt.2
Ch.
5 S
ec.3
.2.1
.2)
1. D
ecem
ber 2
010
Slid
e 12
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Cap
acity
Che
cks –
Stru
ctur
al S
teel
Oth
er li
fting
equ
ipm
ent:
A c
onse
quen
ce fa
ctor
of γ
C=
1.3
shou
ld b
e ap
plie
don
lifti
ng y
okes
, sp
read
er b
ars,
pla
tesh
ackl
es, e
tc.
Lifti
ng p
oint
s:
The
load
fact
or γ
f =
1.3,
is in
crea
sed
by a
co
nseq
uenc
e fa
ctor
, γC
= 1.
3, s
o th
at to
tal
desi
gn fa
ktor
, γde
sign
, bec
omes
:
γdes
ign
= γc
·γf
= 1
.3 ·
1.3
= 1
.7
The
desi
gn lo
ad a
ctin
g on
the
lift p
oint
bec
omes
:
Fdes
ign
= γd
esig
n·Fs
ling
= 1.
7·Fs
ling
Stru
ctur
al s
tren
gth
of L
ifted
Obj
ect:
The
follo
win
g co
nseq
uenc
e fa
ctor
s sh
ould
be
appl
ied
:
A la
tera
l loa
d of
m
inim
um 3
% o
f the
de
sign
load
sha
ll be
in
clud
ed. T
his
load
ac
ts in
the
shac
kle
bow
!(r
ef. P
t.2.C
h.5
Sec
.2.4
.3.4
)Ta
ble
4.1
P
t.2 C
h.5
Sec
.4.1
.2
1. D
ecem
ber 2
010
Slid
e 13
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Con
tent
Brie
f ove
rvie
w o
f rel
evan
t DN
V p
ublic
atio
ns
DN
V R
ules
for M
arin
e O
pera
tions
, 199
6,
Pt.2
Ch.
5 L
iftin
g –
Cap
acity
Che
cks
Sim
plifi
ed M
etho
ds fo
r pre
dict
ion
of H
ydro
dyna
mic
For
ces
oin
Spl
ash
Zone
, DN
V-R
P-H
103
Ch.
4
oin
Dee
pwat
er, D
NV
-RP
-H10
3 C
h.5
1. D
ecem
ber 2
010
Slid
e 14
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Sim
plifi
ed M
etho
d, S
plas
h Zo
ne -
DN
V-R
P-H
103
The
Rec
omm
ende
d P
ract
ice;
”DN
V-R
P-H
103
Mod
ellin
g an
d A
naly
sis
of M
arin
e O
pera
tions
”w
as is
sued
apr
il 20
09 a
nd re
vise
d 20
10.
A S
impl
ified
Met
hod
for c
alcu
latin
g hy
drod
ynam
ic
forc
es o
n ob
ject
s lif
ted
thro
ugh
wav
e zo
ne is
in
clud
ed in
cha
pter
4.
This
Sim
plifi
ed M
etho
d su
pers
edes
the
calc
ulat
ion
guid
elin
es in
DN
V R
ules
for M
arin
e O
pera
tions
, 199
6, P
t.2 C
h.6.
1. D
ecem
ber 2
010
Slid
e 15
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
DN
V-R
P-H
103
-Bac
kgro
und
and
Obj
ectiv
e
Mor
e ac
cura
te p
redi
ctio
n of
des
ign
load
s fo
r mar
ine
oper
atio
ns
Red
uced
Cos
tsIn
crea
sed
Saf
ety
Task
:
Incr
ease
d al
low
able
w
eath
er c
riter
ia
Red
uced
cap
acity
re
quire
men
ts to
cr
ane
and
vess
el
Red
uced
risk
of
wai
ting
on
wea
ther
Wid
er ra
nge
of
suita
ble
inst
alla
tion
vess
els
or
Obj
ectiv
es :
Sim
plifi
ed M
etho
d, S
plas
h Zo
ne -
Ass
umpt
ions
The
Sim
plifi
ed M
etho
d is
bas
ed u
pon
the
follo
win
g m
ain
assu
mpt
ions
:
the
horiz
onta
l ext
ento
f the
lifte
d ob
ject
is
smal
lcom
pare
d to
the
wav
e le
ngth
the
vert
ical
mot
ion
of th
e ob
ject
is e
qual
the
verti
cal c
rane
tip
mot
ion
verti
cal m
otio
n of
obj
ect a
nd w
ater
dom
inat
es
→ot
herm
otio
nsca
n be
dis
rega
rded
The
inte
ntio
nof
the
Sim
plifi
ed M
etho
d is
to
give
sim
ple
cons
erva
tive
estim
ates
of th
e fo
rces
act
ing
on th
e ob
ject
.
1. D
ecem
ber 2
010
Slid
e 17
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Sim
plifi
ed M
etho
d, S
plas
h Zo
ne -
Cra
ne T
ip M
otio
ns
The
Sim
plifi
ed M
etho
d is
una
pplic
able
if th
e cr
ane
tip
osci
llatio
n pe
riod
or th
e w
ave
perio
dis
clo
se to
the
reso
nanc
e pe
riod,
Tn
, of t
he h
oist
ing
syst
emKA
MT n
332
+=
π
Hea
ve, p
itch
and
roll
RA
Os
for
the
vess
el s
houl
d be
com
bine
d w
ithcr
ane
tip p
ositi
onto
find
th
e ve
rtica
l mot
ion
of th
e cr
ane
tip
If op
erat
ion
refe
renc
e pe
riod
is
with
in 3
0 m
inut
es, t
he m
ost
prob
able
larg
est r
espo
nses
may
be
take
n as
1.80
tim
es th
e si
gnifi
cant
resp
onse
s
If th
e ve
ssel
hea
ding
is n
ot fi
xed,
ve
ssel
resp
onse
sho
uld
be
anal
ysed
for w
ave
dire
ctio
ns a
t le
ast
±15°
off t
he a
pplie
dve
ssel
he
adin
g
1. D
ecem
ber 2
010
Slid
e 18
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Sim
plifi
ed M
etho
d, S
plas
h Zo
ne -
Wav
e Pe
riods
Ther
e ar
e tw
o al
tern
ativ
eap
proa
ches
:
139.8
≤≤
⋅zT
gH s
A lo
wer
lim
it of
Hm
ax=1
.8·H
s=λ/
7w
ith
wav
elen
gth λ=
g·T z
2 /2π
is h
ere
used
.
Alt-
1) W
ave
perio
ds a
re in
clud
ed:
Ana
lyse
s sh
ould
cov
er th
e fo
llow
ing
zero
-cr
ossi
ng w
ave
perio
d ra
nge:
gHzT
S⋅
≥6.
10A
low
er li
mit
of H
max
=1.8
·Hs=λ/
10w
ith w
avel
engt
h λ=
g·T z
2 /2π
is h
ere
used
.
Alt-
2) W
ave
perio
ds a
re d
isre
gard
ed:
Ope
ratio
n pr
oced
ures
sho
uld
in th
is c
ase
refle
ct th
at th
e ca
lcul
atio
ns a
re o
nly
valid
for
wav
es lo
nger
than
:
1. D
ecem
ber 2
010
Slid
e 19
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Sim
plifi
ed M
etho
d, S
plas
h Zo
ne -
Wav
e K
inem
atic
s
Alt-
1) W
ave
perio
ds a
re in
clud
ed:
The
wav
e am
plitu
de, w
ave
parti
cle
velo
city
and
acc
eler
atio
n ca
n be
take
n as
:
Sa
H⋅=
9.0ζ
gT
za
wz
d
eT
v22
42
ππ
ζ−
⋅ ⎟⎟ ⎠⎞⎜⎜ ⎝⎛ ⋅
=
gT
za
wz
d
eT
a22
42
2π
πζ
−
⋅⎟⎟ ⎠⎞
⎜⎜ ⎝⎛ ⋅=
sH
d35.0
ve
sH
g30.0
w
−⋅
=π
sH
d35.0
ae
g10.0
w
−⋅
=π
Alt-
2) W
ave
perio
ds a
re d
isre
gard
ed:
The
wav
e pa
rticl
e ve
loci
ty a
nd a
ccel
erat
ion
can
be ta
ken
as:
d:
dist
ance
from
wat
er p
lane
to C
oG o
f
su
bmer
ged
part
of o
bjec
t
1. D
ecem
ber 2
010
Slid
e 20
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Sim
plifi
ed M
etho
d, S
plas
h Zo
ne -
Hyd
rody
nam
ic F
orce
s
Sla
mm
ing
impa
ct fo
rce
Slam
min
g fo
rces
are
sho
rt-te
rm im
puls
e fo
rces
that
act
s w
hen
the
stru
ctur
e hi
ts th
e w
ater
sur
face
.
AS
is th
e re
leva
nt s
lam
min
g ar
ea o
n th
e ex
pose
d st
ruct
ure
part.
Cs
is s
lam
min
g co
eff.
The
slam
min
g ve
loci
ty, v
s, is
:
22
wct
cs
vv
vv
++
=vc
= lo
wer
ing
spee
dvc
t= v
ertic
al c
rane
tip
velo
city
vw=
verti
cal w
ater
par
ticle
vel
ocity
at w
ater
sur
face
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
nsSl
ide
211.
Dec
embe
r 201
0
gV
F⋅
⋅=
δρ
ρ
Var
ying
buo
yanc
y fo
rce
Var
ying
buo
yanc
y, Fρ
, is
the
chan
ge in
bu
oyan
cy d
ue to
the
wat
er s
urfa
ce
elev
atio
n.
δVis
the
chan
ge in
vol
ume
of d
ispl
aced
w
ater
from
stil
l wat
er s
urfa
ce to
wav
e cr
est
or w
ave
troug
h.
22
~ct
awA
Vη
ζδ
+⋅
=
gV
F⋅
⋅=
δρ
ρ ζa=
wav
e am
plitu
deηc
t= c
rane
tip
mot
ion
ampl
itude
Ãw
= m
ean
wat
er li
ne a
rea
in th
ew
ave
surfa
ce z
one
Sim
plifi
ed M
etho
d, S
plas
h Zo
ne -
Hyd
rody
nam
ic F
orce
s
Dra
g fo
rce
Dra
g fo
rces
are
flow
resi
stan
ce o
n su
bmer
ged
part
of th
e st
ruct
ure.
The
dra
g fo
rces
are
rela
ted
to re
lativ
e ve
loci
ty b
etw
een
obje
ct a
nd w
ater
par
ticle
s.
The
drag
coe
ffici
ent,
CD, i
n os
cilla
tory
flow
for
com
plex
sub
sea
stru
ctur
es m
ay ty
pica
lly b
e C
D ≥
2.5.
Rel
ativ
e ve
loci
ty a
re fo
und
by :
22
wct
cr
vv
vv
++
=
vc=
low
erin
g/ho
istin
g sp
eed
vct=
ver
tical
cra
ne ti
p ve
loci
tyvw
= ve
rtica
l wat
er p
artic
le v
eloc
ityat
wat
er d
epth
, d
Ap
= ho
rizon
tal p
roje
cted
are
a
Mas
s fo
rce
“Mas
s fo
rce”
is h
ere
a co
mbi
natio
n of
iner
tia
forc
e, F
roud
e-K
rilof
f for
ce a
nd d
iffra
ctio
n fo
rce.
Cra
ne ti
p ac
cele
ratio
n an
d w
ater
par
ticle
ac
cele
ratio
n ar
e as
sum
ed s
tatis
tical
ly
inde
pend
ent.
()
[]
()
[]2
332
33w
ctM
aA
Va
AM
F⋅
++
⋅+
=ρ
M=
mas
s of
obj
ect i
n ai
rA
33=
heav
e ad
ded
mas
s of
obj
ect
act
= ve
rtica
l cra
ne ti
p ac
cele
ratio
nV
= v
olum
e of
dis
plac
ed w
ater
rela
tive
toth
e st
ill w
ater
leve
law
= ve
rtica
l wat
er p
artic
le a
ccel
erat
ion
at w
ater
dep
th, d
1. D
ecem
ber 2
010
Slid
e 22
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Sim
plifi
ed M
etho
d, S
plas
h Zo
ne -
Hyd
rody
nam
ic F
orce
s
The
hydr
odyn
amic
forc
e is
a ti
me
depe
nden
t fun
ctio
n of
sla
mm
ing
impa
ct
forc
e, v
aryi
ng b
uoya
ncy,
hyd
rody
nam
ic m
ass
forc
esan
d dr
ag fo
rces
. In
the
Sim
plifi
ed M
etho
d th
e fo
rces
may
be
com
bine
d as
follo
ws: 2
2sl
amhy
d)
FF(
)F
F(F
MD
ρ−
++
=
The
stru
ctur
e m
ay b
e di
vide
d in
to
mai
n ite
ms
and
surfa
ces
cont
ribut
ing
to th
e hy
drod
ynam
ic fo
rce
Wat
er p
artic
le v
eloc
ity a
nd
acce
lera
tion
are
rela
ted
to th
e ve
rtica
l cen
tre o
f gra
vity
for e
ach
mai
n ite
m. M
ass
and
drag
forc
es
cont
ribut
ions
are
then
sum
mar
ized
:
∑=
ii
MM
FF
∑=
ii
DD
FF
FMi
and
FDia
re th
e in
divi
dual
fo
rce
cont
ribut
ions
from
eac
h m
ain
item
1. D
ecem
ber 2
010
Slid
e 23
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Sim
plifi
ed M
etho
d, S
plas
h Zo
ne -
Load
Cas
es E
xam
ple
Load
Cas
e 1
Stil
l wat
er le
vel b
enea
th to
p of
ven
tilat
ed b
ucke
ts
Sla
mm
ing
impa
ct fo
rce,
Fsl
am, a
cts
on to
p of
bu
cket
s. In
ertia
forc
e to
be
incl
uded
.
Var
ying
buo
yanc
y fo
rce,
Fρ
, dra
g fo
rce,
FD
and
hydr
odyn
amic
par
t of m
ass
forc
e, F
Mar
e ne
glig
ible
.
The
stat
ic a
nd h
ydro
dyna
mic
forc
esh
ould
be
calc
ulat
ed fo
r diff
eren
t sta
ges.
Rel
evan
t lo
ad c
ases
for d
eplo
ymen
t of a
pro
tect
ion
stru
ctur
e co
uld
be:
Load
Cas
e 2
Stil
l wat
er le
vel a
bove
top
of b
ucke
ts
Sla
mm
ing
impa
ct fo
rce,
Fsl
am, i
s ze
ro
Var
ying
buo
yanc
y, Fρ
, dra
g fo
rce,
FD
and
mas
s fo
rce,
FM
,are
cal
cula
ted.
Vel
ocity
and
ac
cele
ratio
n ar
e re
late
d to
CoG
of
subm
erge
d pa
rt of
stru
ctur
e.
1. D
ecem
ber 2
010
Slid
e 24
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Sim
plifi
ed M
etho
d, S
plas
h Zo
ne -
Load
Cas
es E
xam
ple
Load
Cas
e 3
Stil
l wat
er le
vel b
enea
th ro
of c
over
.
Sla
mm
ing
impa
ct fo
rce,
Fsl
am, a
cts
on th
e ro
of
cove
r.
Var
ying
buo
yanc
y, Fρ
, dra
g fo
rce,
FD
and
mas
s fo
rce,
FM
are
calc
ulat
ed o
n th
e re
st o
f the
st
ruct
ure.
Dra
g-an
d m
ass
forc
es a
cts
mai
nly
on
the
buck
ets
and
is re
late
d to
a d
epth
, d, d
own
to
CoG
of s
ubm
erge
d pa
rt of
the
stru
ctur
e.
Load
Cas
e 4
Stil
l wat
er le
vel a
bove
roof
cov
er.
Sla
mm
ing
impa
ct fo
rce,
Fsl
am, a
nd v
aryi
ng
buoy
ancy
, Fρ,
is z
ero.
Dra
g fo
rce,
FD
and
mas
s fo
rce,
FM
are
calc
ulat
ed
indi
vidu
ally
. The
tota
l mas
s an
d dr
ag fo
rce
is t
he
sum
of t
he in
divi
dual
load
com
pone
nts,
e.g
. :
F D=
F Dro
of +
FD
legs
+ F D
buck
ets
app
lyin
g co
rrec
t CoG
s
1. D
ecem
ber 2
010
Slid
e 25
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Sim
plifi
ed M
etho
d, S
plas
h Zo
ne -
Load
Cas
es E
xam
ple
1. D
ecem
ber 2
010
Slid
e 26
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Sim
plifi
ed M
etho
d, S
plas
h Zo
ne -
Stat
ic W
eigh
t
In a
dditi
on, t
he w
eigh
t ina
ccur
acy
fact
orsh
ould
be
appl
ied
1. D
ecem
ber 2
010
Slid
e 27
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Sim
plifi
ed M
etho
d, S
plas
h Zo
ne -
DA
F
Cap
acity
Che
cks
The
capa
citie
s of
cra
ne, l
iftin
g eq
uipm
ent a
nd
lifte
d ob
ject
are
che
cked
as
for l
ift in
air.
The
fo
llow
ing
rela
tion
shou
ld b
e ap
plie
d:
whe
re
Mg
: wei
ght o
f obj
ect i
n ai
r[N
]
F tot
al: i
s th
e ch
arac
teris
tic to
tal f
orce
on
the
(par
tly o
r ful
ly) s
ubm
erge
d ob
ject
. Tak
en a
s th
e la
rges
t of;
F tot
al =
Fst
atic
-max
+ F
hyd
or
Ftot
al =
Fst
atic
-max
+ F
snap
Fsta
tic-m
axis
the
max
imum
sta
tic
wei
ght o
f the
sub
mer
ged
obje
ctin
clud
ing
flood
ing
and
wei
ght
inac
cura
cy fa
ctor
Fhyd
is th
e hy
drod
ynam
ic fo
rce
Fsna
pis
the
snap
load
(nor
mal
ly
to b
e av
oide
d)
Mg
FD
AFto
tal
=
1. D
ecem
ber 2
010
Slid
e 28
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Sim
plifi
ed M
etho
d, S
plas
h Zo
ne -
Slac
k Sl
ings
The
Sla
ck S
ling
Crit
erio
n.
Sna
p fo
rces
sha
ll as
far a
s po
ssib
le
be a
void
ed. W
eath
er c
rietri
a sh
ould
be
adj
uste
d to
ens
ure
this
.
The
follo
win
g cr
iterio
n sh
ould
be
fulfi
lled
in o
rder
to e
nsur
e th
at s
nap
load
s ar
e av
oide
d:
min
stat
ichy
dF
9.0F
−⋅
≤
Fsta
tic-m
in=
wei
ght b
efor
e flo
odin
g,
incl
udin
g a
wei
ght r
educ
tion
impl
ied
by th
e w
eigh
t ina
ccur
acy
fact
or.
1. D
ecem
ber 2
010
Slid
e 29
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Sim
plifi
ed M
etho
d, S
plas
h Zo
ne -
Add
ed M
ass
Hyd
rody
nam
ic a
dded
mas
s fo
r fla
t pla
tes
ba
476.0
A2
33⋅
⋅⋅
⋅=
πρ
Exa
mpl
e:
Flat
pla
te w
here
le
ngth
, b, a
bove
br
eadt
h, a
, is
b/a
= 2.
0 :
1. D
ecem
ber 2
010
Slid
e 30
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Sim
plifi
ed M
etho
d, S
plas
h Zo
ne -
Add
ed M
ass
Add
ed M
ass
Incr
ease
due
to B
ody
Hei
ght
The
follo
win
g si
mpl
ified
app
roxi
mat
ion
of th
e ad
ded
mas
s in
hea
ve fo
r a th
ree-
dim
ensi
onal
bo
dy w
ith v
ertic
al s
ides
may
be
appl
ied
:
o33
2233
A)
1(2
11
A⋅ ⎥⎥⎥ ⎦⎤
⎢⎢⎢ ⎣⎡
+−+
≈λλ
p
p Ah
A
+=
λ
Adde
d M
ass
Incr
ease
due
to B
ody
Hei
ght
1
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
00.
51
1.5
22.
5ln
[ 1+
(h/s
qrt(A
)) ]
A33/A33o
1+SQ
RT(
(1-la
mbd
a^2)
/(2*(
1+la
mbd
a^2)
))
and
whe
re A33
o=
adde
d m
ass
for a
flat
pla
tew
ith a
sh
ape
equa
l to
the
horiz
onta
l pro
ject
ed
area
of t
he o
bjec
t
h=
heig
ht o
f the
obj
ect
Ap
= ho
rizon
tal p
roje
cted
are
a of
the
obje
ct1.
Dec
embe
r 201
0Sl
ide
31D
NV
Mar
ine
Ope
ratio
ns' R
ules
for S
ubse
a Li
ft O
pera
tions
Sim
plifi
ed M
etho
d, S
plas
h Zo
ne -
Add
ed M
ass
Add
ed M
ass
from
Par
tly E
nclo
sed
Vol
ume
A v
olum
e of
wat
er p
artly
en
lose
d w
ithin
larg
e pl
ated
su
rface
s w
ill a
lso
cont
ribut
e to
the
adde
d m
ass,
e.g
.:
The
volu
me
of w
ater
in
side
suc
tion
anch
ors
or fo
unda
tion
buck
ets.
The
volu
me
of w
ater
be
twee
n la
rge
plat
ed
mud
mat
sur
face
s an
d ro
of s
truct
ures
.
1. D
ecem
ber 2
010
Slid
e 32
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Sim
plifi
ed M
etho
d, S
plas
h Zo
ne -
Add
ed M
ass
Add
ed M
ass
Red
uctio
n du
e to
Per
fora
tion
.
Effe
ct o
f per
fora
tion
on a
dded
mas
s
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.91
010
2030
4050
Perf
orat
ion
Added Mass Reduction Factor
e^-P
/28
Buc
ketK
C0.
1-H
4D-N
iMo
Buc
ketK
C0.
6-H
4D-N
iMo
Buc
ketK
C1.
2-H
4D-N
iMo
Buc
ketK
C0.
5-H
0.5D
-NiM
oB
ucke
tKC
1.5-
H0.
5D-N
iMo
Buc
ketK
C2.
5-H
0.5D
-NiM
oB
ucke
tKC
3.5-
H0.
5D-N
iMo
PLE
T-K
C1-
4R
oof-A
0.5-
2.5+
Hat
ch20
-KC
p0.5
-1.8
Hat
ch18
-KC
p0.3
-0.8
Buc
ketK
C0.
1B
ucke
tKC
0.6
Buc
ketK
C1.
2R
oofK
Cp0
.1-0
.27
Roo
fKC
p0.1
-0.3
7D
NV
-Cur
veM
udm
at C
FD
0.1AA
S3333
=
[]
34/)5
p(co
s3.0
7.0AA
S3333
−+
=π
28p
10
S3333
eAA
−
=
if p
< 5
if 5
< p
< 34
if 3
4 <
p<
50
Rec
omm
ende
d re
duct
ion:
A33
S =
add
ed m
ass
for a
non
-pe
rfora
ted
stru
ctur
e.
No
redu
ctio
n ap
plie
d in
add
ed m
ass
whe
n pe
rfora
tion
is s
mal
l. A
sig
nific
ant d
rop
in th
e ad
ded
mas
s fo
r lar
ger p
erfo
ratio
n ra
tes.
Red
uctio
n fa
ctor
app
licab
le fo
r p<5
0.
1. D
ecem
ber 2
010
Slid
e 33
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Sim
plifi
ed M
etho
d, S
plas
h Zo
ne -
Exam
ple
Cas
e
CFD
ana
lysi
s:R
egul
ar S
toke
s 5t
h w
ave:
H=3
.5m
T=5
.5s
Dom
ain
95x3
0x37
m
4.4
mill
ion
fluid
cel
ls
Min
imum
grid
siz
e 0.
18m
nea
r obj
ect,
stre
tche
d el
sew
here
8.5x
8.5m
sol
id ro
of
and
10x1
0xØ
1.0m
top
fram
e
Ø1.
0m le
gs, h
eigh
t 8m
an
d ho
llow
3.5x
Ø4.
0m b
ucke
ts a
t x,
y=±8
.5m
vent
ilatio
n ho
les
Ø0.
8m
Wal
l thi
ckne
ss 0
.25m
half
mod
el
60s
sim
ulat
ion
time
1. D
ecem
ber 2
010
Slid
e 34
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Sim
plifi
ed M
etho
d, S
plas
h Zo
ne -
Exam
ple
Cas
e Hig
hest
upw
ards
hy
drod
ynam
ic fo
rce
whe
n bu
cket
is fu
llysu
bmer
ged
occu
rs
whe
n th
e ob
ject
is
loca
ted
in a
wav
e tro
ugh.
F hyd
≈1.
1·10
5 N
Buo
yanc
y, ρ
Vg
1. D
ecem
ber 2
010
Slid
e 35
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Con
tent
Brie
f ove
rvie
w o
f rel
evan
t DN
V p
ublic
atio
ns
DN
V R
ules
for M
arin
e O
pera
tions
, 199
6,
Pt.2
Ch.
5 L
iftin
g –
Cap
acity
Che
cks
Sim
plifi
ed M
etho
ds fo
r pre
dict
ion
of H
ydro
dyna
mic
For
ces
oin
Spl
ash
Zone
, DN
V-R
P-H
103
Ch.
4
oin
Dee
pwat
er, D
NV
-RP
-H10
3 C
h.5
1. D
ecem
ber 2
010
Slid
e 36
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Dee
pwat
er O
pera
tions
-C
riter
ia a
ndC
halle
nges
Crit
eria
:
Sta
tic a
nd d
ynam
ic lo
ads
on li
fted
stru
ctur
e, c
rane
, cab
le a
nd ri
ggin
g sh
all
not e
xcee
d ca
paci
ty re
quire
men
ts
Sna
p lo
ads
due
to s
lack
slin
gs o
r sla
ck
cabl
e sh
all b
e av
oide
d
Cha
lleng
es :
Sta
tic w
eigh
tat c
rane
tip
incr
ease
slin
early
w
ith c
able
leng
th
The
reso
nanc
e pe
riod
of th
e lif
ting
syst
em
incr
ease
s w
ith c
able
leng
th. D
ynam
ic
forc
esm
ay in
crea
sedu
e to
reso
nant
am
plifi
catio
n in
duce
d by
the
verti
cal c
rane
tip
mot
ion.
Dyn
amic
For
ces –
Ver
tical
reso
nanc
e
Sim
plifi
ed M
etho
d, D
eepw
ater
-A
ssum
ptio
ns
The
follo
win
g m
ain
assu
mpt
ions
are
appl
ied:
the
subs
ea s
truct
ure
is lo
wer
ed in
to
deep
wat
eran
d is
una
ffect
ed b
y w
ave
forc
es
the
verti
cal m
otio
n of
cra
ne ti
p an
d su
bsea
st
ruct
ure
dom
inat
es →
othe
rmot
ions
can
be
disr
egar
ded
Offs
etdu
e to
cur
rent
forc
es is
dis
rega
rded
Hea
ve c
ompe
nsat
ion
syst
ems
are
not t
aken
in
to a
ccou
nt
Cha
pter
5in
DN
V-R
P-H
103
cove
rs D
eepw
ater
Lo
wer
ing
Ope
ratio
ns.
It in
clud
es a
sim
plifi
ed m
etho
d fo
r est
imat
ing
dyna
mic
resp
onse
of l
ower
ed o
bjec
t.
Cas
e St
udy
–M
ain
Dat
a
The
subs
ea s
truct
ure
mas
s is
97
tonn
es
Wat
er d
epth
is 3
000
m
The
cran
e ca
ble
is a
con
vent
iona
l ste
el w
ire
No
heav
e co
mpe
nsat
ion
syst
em
Cas
e St
udy
–C
rane
Tip
Mot
ion
Lift
at s
ide
of
cran
e ve
ssel
Wav
e he
adin
g 15
°of
f bow
RA
O in
hea
ve,
pitc
h an
d ro
ll ar
e co
mbi
ned
in
orde
r to
find
the
verti
cal m
otio
n at
th
e cr
ane
tip
Ves
sel’s
nat
ural
pe
riod
in ro
ll at
T=
9s d
omin
ates
Cas
e St
udy
–M
otio
n of
Lift
ed O
bjec
t
A c
able
leng
th
of L
=275
0 m
is
sel
ecte
d
This
giv
es a
n un
dam
ped
natu
ral p
erio
d of
the
liftin
g sy
stem
of
T 0=9
s
Cas
e St
udy
–D
ynam
ic L
oad
at L
ifted
Obj
ect
Com
paris
on w
ith a
tim
e-do
mai
n an
alys
is u
sing
a
non-
linea
r FE
co
mpu
ter p
rogr
am
Dyn
amic
am
plifi
catio
n 20
%
high
er a
t nat
ural
pe
riod
T 0=9
s
Dyn
amic
am
p. a
t T=
1.5s
due
to
long
itudi
nal
pres
sure
wav
es
No
wav
e en
ergy
at
T=1.
5s, h
ence
de
viat
ion
is
acce
ptab
le
Cas
e St
udy
–D
ynam
ic F
orce
alo
ng C
able
Cab
le le
ngth
L=
2750
m
Dyn
amic
forc
e co
mpu
ted
appl
ying
ha
rmon
ic o
scill
atio
n at
cra
ne ti
p w
ith
perio
d T=
9s a
nd
ampl
itude
ηa=
1m
Dyn
amic
forc
e sl
ight
ly la
rger
at t
he
cran
e tip
than
at t
he
lifte
d ob
ject
Cap
acity
re
quire
men
ts
chec
ked
at c
rane
tip
Ris
k of
sna
p lo
ads
due
to s
lack
wire
ch
ecke
d at
lifte
d ob
ject
Cas
e St
udy
–D
ynam
ic L
oad
at L
ifted
Obj
ect
Tran
sfer
func
tions
fo
r dyn
amic
load
in
cab
le a
nd
cran
e tip
mot
ion
are
com
bine
d w
ith a
wav
e sp
ectru
m S
(ω)
Jons
wap
wav
e sp
ectru
m w
ith
Hs=
2.0m
and
Tp
=9s
is a
pplie
d
Mos
t pro
babl
e la
rges
t res
pons
e fo
r dyn
amic
forc
e in
cab
le is
foun
d by
:
A d
urat
ion
time
t =30
min
utes
gi
ves
F d=5
30kN
in th
is c
ase
Cas
e St
udy
–D
ynam
ic L
oad
at L
ifted
Obj
ect
Cal
cula
tions
ar
e re
peat
ed
for a
rang
e of
se
asta
tes
Hs=
2.0m
giv
es
acce
ptab
le
dyna
mic
load
s fo
r all
wav
e pe
riods
Cab
le le
ngth
L=
2750
is
appl
ied
Nat
ural
per
iod
of th
e lif
ting
syst
em is
T 0
=9s
Cas
e St
udy
–D
ynam
ic L
oad
at L
ifted
Obj
ect
Tabl
es c
an b
e co
mpu
ted
givi
ng
an o
verv
iew
of
oper
able
se
asta
tes
Red
resu
lts a
re
abov
e in
stal
latio
n lim
it
”Out
side
”mea
ns
non-
exis
tent
se
asta
tes
Cas
e St
udy
–D
ynam
ic L
oad
at L
ifted
Obj
ect
Cal
cula
tions
are
re
peat
ed fo
r a
rang
e of
cab
le
leng
ths
Max
Fd
for a
ll Tz
val
ues
Fd<0
.9*F
stat
ic
in o
rder
to a
void
ris
k of
sna
p lo
ads
due
to
slac
k sl
ings
;
Fd <
68t
Cap
acity
re
quire
men
t of
cran
e an
d ca
ble
gove
rns
for
cabl
e le
ngth
s ab
ove
L>22
50m
du
e to
wei
ght o
f ca
ble
Non
-ope
rabl
e se
asta
tes
.. Q
uest
ions
??
1. D
ecem
ber 2
010
Slid
e 49
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
1. D
ecem
ber 2
010
Slid
e 50
DN
V M
arin
e O
pera
tions
' Rul
es fo
r Sub
sea
Lift
Ope
ratio
ns
Related Documents
