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DNV Marine Operations
DNV-OS-H203 - Transit and Positioning of Offshore Units
Arve Lepsøe / Per Øystein Alvær
09.11.2011
Innhold
Generelt (kort) om
oppdateringen av DNV marine
operasjons reglene!
Gjennomgang av innholdet i
DNV-OS-H203 med vekt på:
o Hva er nytt/oppdatert i H203
sammenlignet med VMO-
Reglene Pt.2 Ch.7 (Transit
and Positioning of Mobile
Offshore Units)
o Henvisninger til krav i DNV-
OS-H101 (Marine
Operations, General) som er
relevante for DNV-OS-H203
Version Slide 2 07 November 2011
Version Slide 3 07 November 2011
F A B C D E
Rules to Standards – DNV Offshore Codes
Recommended Practices
Offshore Service Specifications
H
Offshore Standards
Version Slide 4 07 November 2011
Rules to Standards – Overview (1)
DNV-OS-H102
Design & Fabr.
Pt.1 Ch.2
Pt.1 Ch.3
Pt.1 Ch.4
DNV-OS-H101
General
DNV-OSS-902 Marine Operations
Pt.0 Ch.1
Pt.1 Ch.1
User Information
Warranty Surveys
Planning of
Operations
Design Loads
Structural Design
Towing
Special Sea
Transportation
Risk based
verification
α-factor (JIP)
Load definitions
NDT (waiting time)
Friction
Pt.2 Ch.1
DNV-OS-H201
Load Transfer
Pt.2 Ch.3
Pt.2 Ch.2 DNV-OS-H202
Sea Transport
Load Transfer Operations JIP – Transport
Fatigue
Ship/HLV transports
elaborated
Seafastening
Rule Section New Standard Main Input/updates
Version Slide 5 07 November 2011
Rules to Standards – Overview (2)
Pt.2 Ch.4
DNV-OS-H204
Offshore Inst.
Pt.2 Ch.5
DNV-OS-H205
Lifting
Pt.2 Ch.6
DNV-OS-H206
Subsea
Pt.2 Ch.7
DNV-OS-H203
Rig Moves
Offshore
Installation
Lifting
Sub Sea
Operations
Transit and
Positioning of
MOU
General update
Use of soft rope slings
Small lifts (<50 tonnes)
Sling safety factor
Complete update
MWS for Pipe laying.
Installation of umbilicals, spools, etc.
Safety factors fibre- & wire ropes.
Subsea installation systems
DNV-RP-H103
Lay-out update
Pre-laid anchors
Clearances
DP elaborated
Hook-up of FPSO’s
Lay-out update
Suction anchors
Version Slide 6 07 November 2011
Rules to Standards – Status
DNV-OSS-902 Marine Operations
DNV-OS-H101 General
DNV-OS-H102 Design & Fabrication
DNV-OS-H201 Load Transfer
DNV-OS-H202 Sea Transport
DNV-OS-H204 Offshore Inst.
DNV-OS-H205 Lifting
DNV-OS-H206 Subsea
DNV-OS-H203 Rig Moves
NA
Hearing completed
Hearing completed
Nov-11
Jan-11
On hearing
Nov-11
Dec-11
Dec-11
New DNV Offshore Code Hearing
Oct-12
Issued
Dec-11
Mar-12
Apr-12
Feb-12
Mar-12
Apr-12
Apr-12
Planned
issued
Version Slide 7 07 November 2011
OFFSHORE STANDARD
DNV-OS-H203
Transit and Positioning of
Offshore Units
FEBRUARY 2012
The electronic pdf version of this document found through http://www.dnv.com is the officially binding version
DET NORSKE VERITAS AS
VMO Rules Pt.2 Ch.7 to DNV-OS-H203
Text Lay-out and Distribution
DNV-OS-H203
Text columns: 1
Available on paper: No
On DNV homepage: Yes,
for free
Sections: 6
Text pages: 29
Paragraphs: 936
Words: 11 190
VMO-Rules Pt.2 Ch.7
Text columns: 2
Available on paper: Yes
for NOK 2.500 (Complete)
On DNV homepage: No
Sections: 4
Text pages: 13
Paragraphs: 507
Words: 6 785
Version Slide 8 07 November 2011
Section Numbers and Titles
DNV-OS-H203 VMO-Rules Pt.2 Ch.7
Version Slide 9 07 November 2011
Section 1 - Introduction
Section 2 – Planning and
Preparations
Section 3 - Transit
Section 4 - Positioning
Section 1 - Introduction
Section 2 – General
Requirements
Section 3 – Transit
Section 4 – Anchored
Units
Section 5 – Dynamically
Positioned Units
Section 6 – Self-
Elevating Units
Main References to Other Codes
DNV-OS-H203
New DNV OS (and RPs) for
Marine Operations
DNV-OSS-101 (DNV Rules for
Classification)
DNV-OS-C104 (Self-elv. Units)
DNV-OS-E301 Positioning
Mooring
DNV-OS-E302/E303/E304 & DNV-
RP-E301/E302 & E307 (Mooring lines,
anchors & DP)
VMO-Rules Pt.2 Ch.7
Other parts of VMO-Rules (DNV Rules for Planning and
Execution of Marine Operations)
DNV Rules for
Classifications of MOU
DNV-RP-E301/E302 (Anchor design and installation)
Version Slide 10 07 November 2011
IMO MSC/Circ. 645
ISO 19901-7
API RP 2SK
NMD Reg. 10/70/09
DNV-OS-H203 Sec.1 - Introduction
Section 1 and called Introduction in Pt.2 Ch.7 as well
Application: Wording changed from …Mobile Offshore Units to
…Offshore Units for the positioning phase. (NB: and also on the
document itself!)
List(s) of references and conditions for use included.
Definitions: Updated/expanded…..Shall/should defined.
Version Slide 11 07 November 2011
DNV-OS-H203 Section 2
Title and sub-titles modified
Content updated/expanded
Risk management included under own heading
Version Slide 12 07 November 2011
DNV-OS-H203 Section 3 - Transit
Title as in Pt.2 Ch.7
Content updated/expanded/re-
arranged
The requirements to emergency
(safe) jack up locations moved to
new section 6
Version Slide 13 07 November 2011
Definition of temporary safe condition slightly modified, 10year
return criteria based on actual TR.
Requirements to planning phase elaborated.
Section 4 – Anchored Units
Version Slide 14 07 November 2011
Requirements to 3 types of
mooring categories clarified
(illustrated on own slide
covering drag installed
anchors)
Requirements to clearances
updated (own slides)
Connection to pre-laid
mooring (included mainly to
cover hook-up of FPSOs)
Version Slide 15 07 November 2011
Mooring category
1
Long-term or
permanent mooring
2
Mobile mooring
3
Weather restricted
mooring
Mooring period, P P > 5 years P < 5 years P = Operation reference
period (TR)
Typical unit involved Production/storage
unit or loading buoy
Drilling unit and
accommodation unit.
Installation vessel,
SSCV
Theoretical verification of
anchor resistance
As required by national governmental
regulations, or as given in:
DNV-OS-E301, DNV-RP-E301 and DNV-RP-
E302,
or equivalent recognised code/standard.
Calculations normally
not required. See 503
and 504.
Minimum test load and
procedure for verification
(testing) of anchor resistance
as installed on actual location
As approved in the anchor design. Any
applicable national governmental regulations to
be considered.
1.25 times the maximum
calculated line tension.
Maximum test load
Chain cable: Maximum of chain proof load and 0.66 MBL
Steel wire or fibre rope: 0.66 MBL
Minimum time for test load 15 minutes
Drag installed anchors - Summary
Survey interval
row removed
New name
Updated
Moved
Version Slide 16 07 November 2011
Units/structures
involved
Text
references1)
Clearance during
positioning
Clearance in normal
operation
Vertical Horizontal Vertical Horizontal
Floating and fixed
units, or two floating
units
See 402
50 m
See 402
ALS: 10 m
Floating and fixed
units, or two floating
units, weather
restricted operations
C 300 50 m ULS: 5 m
ALS: 3 m
1) See C 100 for general requirements in addition to the indicated text references.
402 The horizontal minimum clearances shall be maintained for all possible relative
vertical positions, including motions, between the units.
Clearances for Anchored Units
E.g. C104: Maximum motions due to the design environmental conditions during
the operation shall be considered in order to establish sufficient clearance.
Requirements to self-elevating units removed from table
Version Slide 17 07 November 2011
Units/structures and
mooring elements involved
Text
references1)
Clearance during positioning Clearance in normal operation
Vertical Horizontal Vertical Horizontal
Line and a “hot” unit 502 30 m ULS: 10 m
ALS: No contact
Line and a “cold” unit 502 & 506 10 m ULS: 5 m
ALS: See 506
Line and a “hot” riser Infinite, i.e.
no crossing 150 m
Infinite, i.e. no
crossing
ULS: 100 m
ALS: 30 m
Line and unprotected
pipeline3) 503 30 m 150 m
ULS: 20 m
ALS: No
contact
ULS: 100 m
ALS: No
contact
Line and protected
pipeline3) 503 & 507 10 m 50 m
ULS: 10 m
ALS: See text
ULS: 50 m
ALS: See text
Line and sub-sea structure 509 Infinite, i.e.
no crossing 150 m
Infinite, i.e. no
crossing
ULS: 100 m
ALS: 50 m
Lines of two or more units 505 & 508 20 m - ULS: 10 m
ALS: See text -
Anchor and pipeline3) (line
crossing pipeline)
602 & 603 See D.103
& D.104
250 m - 250 m
Anchor and pipeline3) (line
not crossing pipeline) 150/50 m - 150/50 m
Anchor and sub-sea
structure 300/50 m - 300/50 m
Clearances for Lines & Anchors
Version Slide 18 07 November 2011
No line area
Horizontal minimum clearance (H)
Vertical
minimum
clearance
(V) 30% of V
70% of H pipeline
Combined (V & H) Clearances
2_
2_ clearanceHorizontalclearanceVertical
502 The minimum clearances between lines and platforms (units) are in any direction, i.e.
≥ minimum clearance.
503 Between lines and pipelines linear relationship between vertical and horizontal
clearances should be assumed. E.g. if the horizontal clearance is 70% of the required
minimum clearance the vertical clearance should be ≥ 30% of the minimum vertical
clearance corresponding to zero horizontal clearance. See Figure 4 1.
Pt.2 Ch.7
Section 5 – Dynamically Positioned Units
Pt.2 Ch.7 included only some general references, while DNV-OS-
H203 is detailing (through references were relevant) requirements to:
- Design conditions & design evaluations
- Planning and documentation
- DP operation versus DP equipment class (own slide)
- Field arrival
- Complex and close proximity DP operations
- Contingencies
- Annual DP trial
- Checklists
- Operational aspects
Version Slide 19 07 November 2011
Version Slide 20 07 November 2011
ACTIVITY CLASS a) Manned underwater operations (high risk) 3
b) Other manned underwater operations 2
c) Support vessels for manned underwater operations conducted
from work boats 2
d) Drilling and well activities 3
e) Facilities that produce hydrocarbons 3
f) Flotels with gangway connected 3
g) All activities within the safety zone 2
h) Activities with limited clearance to the facility where the vessel
represents a risk to the facility 3
i) Loading operations from FSUs and FPSOs (tank vessels) 2
j) Loading operations from buoys 1
k) Other well activities 2
l) Shallow drilling 1
DP equipment class selection
Section 6 – Self-Elevating Units
The technical content regarding self-elevating units is
not significantly updated.
Version Slide 21 07 November 2011
The content has been
considerably re-arranged.
References to planning and
documentation requirements
are included/clarified.
Reference to general
operational requirements in
DNV-OS-H101 included.
Version Slide 22 07 November 2011
101 Transit and positioning operations shall be planned and documented according to the requirements and
philosophies given in DNV-OS-H101, Section 2.
Guidance Note Extent of planning and documentation for a specific transit and/or positioning operation should reflect the operation complexity and existing experience with similar operations.
DNV-OS-H101 - Planning
A 100 Philosophy
101 Marine operations shall be planned according to safe and sound
practice, and according to defined codes and standards.
102 A marine operation shall be designed to bring an object from one
defined safe condition to another.
Guidance note:
“Safe Condition” is defined as a condition where the object is considered exposed to
normal risk (i.e. similar risk as expected during in-place condition) for damage or loss.
Mange andre krav som kan/må sees i sammenheng med GN
Version Slide 23 07 November 2011
DNV-OS-H101 - Environmental Conditions
Some applicable items:
How to consider seasonal variations, e.g.:
February March April
Operation period
Return period to be considered based on reference period:
Reference Period, TR Return Period, Td
TR 3 days Td ≥ 1 month
3 days < TR 7 days Td ≥ 3 months
7 days < TR 30 days Td ≥ 1 year
30 days < TR 180 days Td ≥ 10 years
TR > 180 days Td ≥ 100 years
Version Slide 24 07 November 2011
DNV-OS-H101 - Operation Periods
WF WF WF WF (Weather forecast issued) Operation starts
TPOP TC
TR
(Basis for selecting α-factor)
Required weather window with OPWF ≤ α x OPLIM
Estimated time for the operation
TR = Operation reference period
TPOP = Planned operation period
TC = Estimated maximum contingency time
Version Slide 25 07 November 2011
Operational Limiting Criteria
The OPLIM (Limiting operational environmental criteria)
shall never be taken greater than the minimum of:
- The environmental design criteria.
- Maximum wind and waves for safe working- or transfer conditions for
personnel.
- Equipment (e.g. ROV and cranes) specified weather restrictions.
- Limiting weather conditions of diving system (if any).
- Limiting conditions for position keeping systems.
- Any limitations identified, e.g. in HAZID/HAZOP, based on operational
experience with involved vessel(s) etc.
The forecasted (monitored) operational criteria - OPWF
- is defined as OPWF = α x OPLIM.
Version Slide 26 07 November 2011
DNV-OS-H101 - Alpha Factors
Operational
Period [h]
Design Wave Height [m]
Hs = 1 1 < Hs < 2 Hs =2= 2 2 < Hs < 4 Hs = 4 4 < Hs < 6 Hs ≥ 6
TPOP ≤12 0.65
Lin
ear
Inte
rpo
lati
on
0.76
Lin
ear
Inte
rpo
lati
on
0.79
Lin
ear
Inte
rpo
lati
on
0.80
TPOP ≤24 0.63 0.73 0.76 0.78
TPOP ≤36 0.62 0.71 0.73 0.76
TPOP ≤48 0.60 0.68 0.71 0.74
TPOP ≤72 0.55 0.63 0.68 0.72
The alpha factor for waves is defined by 5 Tables, below “Base Case”:
The other tables take into account combinations of
o Wave monitoring
o Weather forecast level
o Meteorologist at site
Version Slide 28 07 November 2011
Any Questions?
Request for receiving DNV-OS-H203 for comments in the hearing period:
DNV-OS-H203 for Comments
© Det Norske Veritas AS. All rights reserved.
DNV Alpha factor
07 February 2011
CONFIDENTIAL
29
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and the environment
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