ISO/TR 19905-2:2012

Petroleum and natural gas industries — Site-specific assessment of mobile offshore units — Part 2: Jack-ups commentary and detailed sample calculation

ISO/TR 19905-2:2012 provides a commentary to some clauses of ISO 19905-1 including background information, supporting documentation, and additional or alternative calculation methods as applicable and also provides a detailed sample 'go-by' calculation. ISO 19905-1 specifies requirements and guidance for the site-specific assessment of independent leg jack‑up units for use in the petroleum and natural gas industries.

Industries du pétrole et du gaz naturel — Évaluation spécifique au site d'unités mobiles en mer — Partie 2: Compléments sur les plates-formes auto-élévatrices

General Information

• Status: Published
• Publication Date: 14-Dec-2012
• ICS: 75.180.10 - Exploratory, drilling and extraction equipment
• Technical Committee: ISO/TC 67/SC 7 - Offshore structures
• Drafting Committee: ISO/TC 67/SC 7/WG 7 - Site specific assessment of mobile offshore units (MOUS)
• Current Stage: 9092 - International Standard to be revised
• Completion Date: 14-Dec-2022

Relations

• Consolidates: ISO 20182:2005 - Refractory test piece preparation — Gunning refractory panels by the pneumatic-nozzle mixing type guns
• Effective Date: 06-Jun-2022

Standards Content (Sample)

TECHNICAL ISO/TR
REPORT 19905-2
First edition
2012-12-15

Petroleum and natural gas industries —
Site-specific assessment of mobile
offshore units —
Part 2:
Jack-ups commentary and detailed
sample calculation
Industries du pétrole et du gaz naturel — Évaluation liée au site des
unités marines mobiles —
Partie 2: Compléments sur les plates-formes auto-élévatrices




Reference number
ISO/TR 19905-2:2012(E)
©
ISO 2012

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ISO/TR 19905-2:2012(E)

COPYRIGHT PROTECTED DOCUMENT


©  ISO 2012
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ii © ISO 2012 – All rights reserved

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ISO/TR 19905-2:2012(E)
Contents Page
Foreword .v
Introduction.vii
1 Scope.1
2 References .1
3 Terms and definitions .1
4 Symbols.1
4.1 Symbols for Clause 6.1
4.2 Symbols for Clause 7.3
4.3 Symbols for Clause 8.5
4.4 Symbols for Clause 9.6
4.5 Symbols for Clause 10.6
4.6 Symbols for Clause 12.8
5 Commentary on ISO 19905-1:2012, Clauses 5 and A.5 .8
6 Commentary on ISO 19905-1:2012, Clauses 6 and A.6 .8
TR.6.4.1 Metocean data — General.8
TR.6.4.2 Waves .8
TR.6.4.3 Current.20
TR.6.4.4 Water depths.20
TR.6.4.5 Wind .21
7 Commentary to ISO 19905-1:2012, Clauses 7 and A.7 .24
TR.7.1 Scope .24
TR.7.3.2 Hydrodynamic model .24
TR.7.3.2.1.1 Length of members .24
TR.7.3.2.1.2 Spudcan.24
TR.7.3.2.1.3 Shielding and solidification.24
TR.7.3.2.2 “Detailed” leg model .25
TR.7.3.2.3 “Equivalent” leg model .25
TR.7.3.2.3.1 Equivalent drag coefficient.25
TR.7.3.2.3.2 Equivalent inertia coefficient.26
TR.7.3.3 Wave and current actions.48
TR.7.3.4 Wind actions .57
TR.7.8 Other considerations.57
APPENDIX TR.7.A : Example of equivalent model computations.58
APPENDIX TR.7.B: Comparison cases to assess implications of the ISO 19905-1 formulation .63
APPENDIX TR.7.C: Comparison of test results for chords.67
8 Commentary to ISO 19905-1:2012, Clauses 8 and A.8 .70
TR A.8.8.6 Derivation of the alternative simplified negative stiffness correction term for P-∆
effects .70
9 Commentary to ISO 19905-1:2012, Clauses 9 and A.9 .77
TR.9.3.6.2 Derivation of the limiting horizontal reaction given in ISO 19905-1:2012, Table A.9.3.7 .77
10 Commentary to ISO 19905-1:2012, Clauses 10 and A.10 .79
TR.10.4.2.1 Natural period — General .79
TR.10.4.2.2 Derivation of K , effective stiffness used to calculate the jack-up natural period.82
e
TR.10.4.3.3 Hysteretic damping .95
TR.10.4.3.4 Vertical radiation damping in earthquake analysis .96
TR.10.5.3.4 / C.2.4 Guidance on the fourth method of ISO 19905-1:2012, Table A.10.5.1 —
Application of the drag-inertia method .96
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ISO/TR 19905-2:2012(E)
11 Commentary to ISO 19905-1:2012, Clauses 11 and A.11.96
12 Commentary to ISO 19905-1:2012, Clauses 12 and A.12.96
TR.12.6.2.2 Nominal bending strength .96
TR.12.6.2.2.1 Example .96
TR.12.6.3.2 Background for η in interaction equation approach.97
13 Commentary to ISO 19905-1:2012, Annex C .98
TR.C.2.4 Guidance on the fourth method of ISO 19905-1:2012, Table A.10.5.1 — Application of
the drag-inertia method.98
Annex A (informative) Detailed example calculation.99
Annex B (informative) SIPM “drag-inertia method” for dynamic analysis and estimation of
extreme response for jack-ups.266
Bibliography .295

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ISO/TR 19905-2:2012(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
In exceptional circumstances, when a technical committee has collected data of a different kind from that
which is normally published as an International Standard (“state of the art”, for example), it may decide by a
simple majority vote of its participating members to publish a Technical Report. A Technical Report is entirely
informative in nature and does not have to be reviewed until the data it provides are considered to be no
longer valid or useful.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO/TR 19905-2 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore
structures for petroleum, petrochemical and natural gas industries, Subcommittee SC 7, Offshore structures.
ISO 19905 consists of the following parts, under the general title Petroleum and natural gas industries — Site-
specific assessment of mobile offshore units:
⎯ Part 1: Jack-ups
⎯ Part 2: Jack-ups commentary and detailed sample calculation [Technical Report]
The following part is under preparation:
⎯ Part 3: Floating units
ISO/TR 19905-2:2012 was prepared in 2012 and is referenced as ISO/TR 19905-2:2012. Users are advised,
however, that it was published, and only became available, in 2013.
ISO 19905 is one of a series of International Standards for offshore structures. The full series consists of the
following International Standards:
⎯ ISO 19900, Petroleum and natural gas industries — General requirements for offshore structures
⎯ ISO 19901-1, Petroleum and natural gas industries — Specific requirements for offshore structures —
Part 1: Metocean design and operating considerations
⎯ ISO 19901-2, Petroleum and natural gas industries — Specific requirements for offshore structures —
Part 2: Seismic design procedures and criteria
⎯ ISO 19901-3, Petroleum and natural gas industries — Specific requirements for offshore structures —
Part 3: Topsides structure
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ISO/TR 19905-2:2012(E)
⎯ ISO 19901-4, Petroleum and natural gas industries — Specific requirements for offshore structures —
Part 4: Geotechnical and foundation design considerations
⎯ ISO 19901-5, Petroleum and natural gas industries — Specific requirements for offshore structures —
Part 5: Weight control during engineering and construction
⎯ ISO 19901-6, Petroleum and natural gas industries — Specific requirements for offshore structures —
Part 6: Marine operations
⎯ ISO 19901-7, Petroleum and natural gas industries — Specific requirements for offshore structures —
Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units
1)
⎯ ISO 19901-8 , Petroleum and natural gas industries — Specific requirements for offshore structures —
Part 8: Marine soil investigations
⎯ ISO 19902, Petroleum and natural gas industries — Fixed steel offshore structures
⎯ ISO 19903, Petroleum and natural gas industries — Fixed concrete offshore structures
⎯ ISO 19904-1, Petroleum and natural gas industries — Floating offshore structures — Part 1: Monohulls,
semi-submersibles and spars
⎯ ISO 19905-1, Petroleum and natural gas industries — Site-specific assessment of mobile offshore
units — Part 1: Jack-ups
⎯ ISO/TR 19905-2, Petroleum and natural gas industries — Site-specific assessment of mobile offshore
units — Part 2: Jack-ups commentary and detailed sample calculation
1)
⎯ ISO/TR 19905-3 , Petroleum and natural gas industries — Site-specific assessment of mobile offshore
units — Part 3: Floating units
⎯ ISO 19906, Petroleum and natural gas industries — Arctic offshore structures

1) Under preparation.
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ISO/TR 19905-2:2012(E)
Introduction
The series of International Standards applicable to types of offshore structures, ISO 19900 to ISO 19906,
addresses design requirements and assessments for all offshore structures used by the petroleum and natural
gas industries worldwide. Through their application, the intention is to achieve reliability levels appropriate for
manned and unmanned offshore structures, whatever the type of structure and the nature or combination of
the materials used.
It is important to recognize that structural integrity is an overall concept comprising models for describing
actions, structural analyses, design or assessment rules, safety elements, workmanship, quality control
procedures and national requirements, all of which are mutually dependent. The modification of one aspect of
the design or assessment in isolation can disturb the balance of reliability inherent in the overall concept or
structural system. The implications involved in modifications, therefore, need to be considered in relation to
the overall reliability of offshore structural systems.
The series of International Standards applicable to the various types of offshore structure is intended to
provide a wide latitude in the choice of structural configurations, materials and techniques without hindering
innovation. Sound engineering judgement is therefore necessary in the use of these International Standards.
[5]
ISO 19905-1 was developed from SNAME T&R Bulletin 5-5A , but has been considerably altered from that
original document. Some of the alterations have involved a restructuring and modification of terminology, but
there have been additional changes of greater technical consequence. New material has been added based
on studies undertaken since the original development of SNAME T&R 5-5A; new calculation techniques have
been addressed because of improved computational capabilities allowing more complex assessments; gaps
that existed in the original SNAME T&R 5-5A have been filled, thereby ensuring a more thorough assessment;
and changes have been made to align ISO 19905-1 with other standards within the 19900 series. A
description of the more important changes, along with the reasoning for the changes, can be found in a series
of papers published in 2012 by Offshore Technology Conference. These papers can be of considerable value
in helping the analyst, particularly those who are familiar with SNAME T&R 5-5A, in understanding
ISO 19905-1. The papers, part of the Technical Session ISO 19905-1: A Site-Specific Assessment of Mobile
Jack-Up Units are listed in the Bibliography:
⎯ Reference [6], Background to the ISO 19905-Series and an Overview of the New ISO 19905-1 for the
Site-Specific Assessment of Mobile Jack-Up Units
⎯ Reference [7], Environmental Actions in the New ISO for the Site-Specific Assessment of Mobile Jack-Up Units
⎯ Reference [8], Structural Modeling and Response Analysis in the New ISO Standard for the Site-Specific
Assessment of Mobile Jack-Up Units
⎯ Reference [9], Foundation Modeling and Assessment in the New ISO Standard 19905-1
⎯ Reference [10], Long-Term Applications in the ISO Standard for Site Specific Assessment of Mobile
Jack-Up Units and the Use of Skirted Spudcans
⎯ Reference [11], Structural Acceptance Criteria in the New ISO for the Site-Specific Assessment of Mobile
Jack-Up Units
⎯ Reference [12], The Benchmarking of the New ISO for the Site-Specific Assessment of Mobile Jack-Up Units
This part of ISO 19905, which has been developed from SNAME T&R Bulletin 5-5A, provides a commentary
to some clauses of ISO 19905-1 including background information, supporting documentation, and additional
or alternative calculation methods as applicable and also provides a detailed sample “go-by” calculation in
Annex A. The reader is advised that the information presented herein is intended for use in conjunction with
ISO 19905-1 and that the cautions and limitations discussed in ISO 19905-1 apply.
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TECHNICAL REPORT ISO/TR 19905-2:2012(E)

Petroleum and natural gas industries — Site-specific
assessment of mobile offshore units —
Part 2:
Jack-ups commentary and detailed sample calculation
1 Scope
This part of ISO 19905 provides a commentary to some clauses of ISO 19905-1 including background
information, supporting documentation, and additional or alternative calculation methods as applicable and
also provides a detailed sample 'go-by' calculation. ISO 19905-1 specifies requirements and guidance for the
site-specific assessment of independent leg jack-up units for use in the petroleum and natural gas industries.
2 References
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 19905-1:2012, Petroleum and natural gas industries — Site-specific assessment of mobile offshore
units — Part 1: Jack-ups
3 Terms and definitions
For the purposes of this document the terms and definitions given in ISO 19905-1 apply.
4 Symbols
4.1 Symbols for Clause 6
C drag coefficient
D
C D equivalent drag coefficient times effective diameter
De e
d water depth
D depth attenuation
2
D(θ ) directional spreading function from ISO 19901-1
F(α) directional spreading function from SNAME
f frequency (Hz)
g acceleration due to gravity
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ISO/TR 19905-2:2012(E)
H wave height
H reduced wave height which may be used in deterministic/regular wave force calculations
det
H maximum wave height for a given return period; used for airgap calculations
max
H wave height associated with H , equivalent to the height between the extreme crest and the
mpm srp
following trough
H estimate of H significant wave height (metres)
mo s
H scaled significant wave height to be used in irregular seas simulation (metres)
s
H significant wave height for assessment return period
srp
k wave number
2m
m power constant in the ⎡⎤cos α spreading function
()
⎣⎦
S (f) power density of wave surface elevation as a function of wave frequency
nn
T wave period (seconds)
T wind averaging time (seconds)
T standard reference time averaging interval for wind speed of 1 h = 3 600 s
0
T peak period in wave spectrum (seconds)
p
T zero-upcrossing period of wave spectrum (seconds)
z
U wind speed
U (10) is the sustained wind speed at 10 m height above mean sea level
w,T
U is the 1 h sustained wind speed at the reference elevation 10 m above mean sea level
w0
u the computed velocity for long crested waves
u the reduced horizontal velocity
red
V current velocity
α equilibrium range parameter
α skewness
3
α kurtosis
4
γ peak enhancement factor
γ scaling of drag forces
d
κ kinematics reduction factor
η crest elevation by Airy theory
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ISO/TR 19905-2:2012(E)
η crest elevation by Stokes
s
φ directional spreading factor defined in ISO 19901-1
σ spectral peakwidth parameter
4.2 Symbols for Clause 7
A cross-sectional area of member
A equivalent area of leg per unit height
e
A equivalent area of element
i
A sum of projected areas for all members in the considered plane
s
A total projected envelope area of the considered plane
t
C added mass coefficient
A
C drag coefficient
D
C drag coefficient for chord at direction θ = 0°
Do
C drag coefficient for flow normal to the rack, θ = 90°
D1
C equivalent drag coefficient
De
C equivalent drag coefficient of member i
Dei
C drag coefficient of an individual member, related to D
Di i
C (θ ) drag coefficient to the projected diameter
Dpr
C drag coefficient for a rough member
Drough
C drag coefficient for a smooth member
Dsmooth
C inertia coefficient
M
C equivalent inertia coefficient
Me
C equivalent inertia coefficient of member i
Mei
C inertia coefficient of a member, related to D
Mi i
d mean, undisturbed water depth (positive)
D member diameter
D equivalent diameter of leg bay
e
D face width of leg, outside dimensions
F
D reference dimension of individual leg members
i
D (θ) projected diameter of the chord
pr
f fundamental vibration frequencies of the member
i
H significant wave height
s
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ISO/TR 19905-2:2012(E)
k roughness height
k/D relative roughness
KC Keulegan-Carpenter number
l length of member “i” node to node
i
m added mass contribution (per unit length) for the member
a
N constant in wind velocity power law
�
r velocity of the considered member, normal to the member axis and in the direction of the
n
combined particle velocity
�� acceleration of the considered member, normal to the member axis and in the direction of the
r
n
combined particle velocity
Re Reynolds number
s length of one bay, or part of bay considered
S Strouhal number
S average wave steepness
S outer diameter of an array of tubulars
T wave period
T first natural period of sway motion
n
T zero-upcrossing period
z
u particle velocity
u particle velocity normal to the member
n
u� particle acceleration normal to the member
n
u , u� horizontal water particle velocity and acceleration
x
x
U flow velocity at the depth of the considered element
U current particle velocity
C
U maximum orbital particle velocity
m
U reduced particle velocity for regular waves
red
U representative wave particle velocity
W
v total flow velocity normal to the member
n
V reduced current velocity for use in the hydrodynamic model; V should not be taken as less than
C C
0,7V
f
V current velocity normal to member used in the hydrodynamic model
Cn
V far field (undisturbed) current
f
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ISO/TR 19905-2:2012(E)
W dimension from backplate to pitch point of triangular chord or dimension from root of one rack to
tip of other rack of split tubular chord
W width of the structure
z coordinate measured vertically upward from the mean water surface
z′ modified coordinate to be used in particle velocity formulation
α indicator for relative velocity, 0 or 1
α angle defining flow direction relative to member
i
β ratio of Re/KC, a parameter to describe the test environment
β angle defining the member inclination
i
∆F drag force per unit length
drag
∆F inertia force per unit length
inertia
∆F horizontal inertia force per unit length
inertiaH
λ wave length
ν kinematic viscosity
θ angle in degrees for waves relative to the chord orientation
θ angle where half the backplate is hidden behind the rackplate
o
ρ mass density of water or air
ζ instantaneous water surface elevation (same axis system as z)
ζ wave crest elevation (same axis system as z)
o
4.3 Symbols for Clause 8
K lateral stiffness without axial load
o
K lateral stiffness with axial load
1
K sum of individual leg stiffnesses
E
L distance from the spudcan point of rotation to the hull centre of gravity
P axial load in one leg
P total gravity load only
G
P effective hull gravity load; includes hull weight and weight of the legs above the hull
g
y deflection without axial load P
0
y additional lateral deflection due to axial load P
1
y total lateral deflection
max
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ISO/TR 19905-2:2012(E)
4.4 Symbols for Clause 9
a depth interpolation parameter
B soil buoyancy of spudcan below bearing area, i.e. the submerged weight of soil displaced by
S
the spudcan below D, the greatest depth of maximum cross-sectional spudcan bearing area
below the sea floor
F horizontal force applied to the spudcan due to the assessment load case
H
F gross vertical force acting on the soil beneath the spudcan due to the assessment load case
V
Q gross ultimate vertical foundation capacity
V
V maximum vertical reaction under the spudcan considered required to support the in-water
Lo
weight of the jack-up during the entire preloading operation (this is not the soil capacity)
W submerged weight of the backfill
BF
γ preload resistance factor
R,PRE
4.5 Symbols for Clause 10
A axial area of one leg (equals sum of effective chord areas, including a contribution from rack
teeth; see ISO 19905-1:2012, A.8.3.3, Note)
A effective shear area of one leg
s
d distance between upper and lower guides
D hysteretic damping
hyst
E Young's modulus
F shear transmitted from the hull
F geometric factor; = 1,125 (three-leg jack-up), 1,0 (four-leg jack-up)
g
F factor to account for horizontal soil stiffness, K , and horizontal leg-hull connection stiffness, K
h hs hh
F modification factor to be applied to the leg lateral deformation stiffness
h
F factor to account for the number of chords; = 0,5 (three-chord leg), 1,0 (four-chord leg)
n
F modification factor to be applied to the leg-hull connection stiffness
r
F factor to account for vertical soil stiffness, K , and vertical leg-hull connection stiffness, K
v vs vh
g acceleration due to gravity
h distance between chord centres (opposed pinion chords) or pinion pitch points (single rack chords)
I second moment of area of leg
I representative second moment of area of the hull girder joining two legs about a horizontal axis
H
normal to the line of environmental action
K effective horizontal stiffness due to axial deformation
A
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ISO/TR 19905-2:2012(E)
K effective bending stiffness
B
K effective stiffness associated with one leg
e
k combined vertical stiffness of all fixation system components on one chord
f
K horizontal leg-hull connection stiffness
hh
K hull rotational stiffness
hull
k combined vertical stiffness of all jacking system components on one chord
j
K leg-hull connection rotational stiffness
rh
K leg-soil connection rotational stiffness
rs
k total lateral stiffness of upper guides with respect to lower guides
u
K effective stiffness due to the series combination of all vertical pinion or fixation system
vh
stiffnesses, allowing for combined action with shock-pads, where fitted
L length of leg considered
M effective mass associated with one leg
e
M moment on leg-hull spring
h
M full mass of hull including maximum variable load
hull
M mass of leg above lower guide (in the absence of a clamping mechanism) or above the centre
la
of the clamping mechanism
M mass of leg below the point described for M , including added mass for the submerged part of
lb la
the leg ignoring spudcan
M moment on leg-soil spring
s
N number of legs
P axial load in leg
P mean force due to vertical fixed load and variable load acting on one leg
P Euler buckling strength of one leg
E
T highest (or first mode) natural period
n
x hull deflection
h
Y distance between
...