BS EN ISO 19901-7:2013
$215.11
Petroleum and natural gas industries. Specific requirements for offshore structures – Stationkeeping systems for floating offshore structures and mobile offshore units
| Published By | Publication Date | Number of Pages |
| BSI | 2013 | 198 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 11 | 1 Scope |
| 12 | 2 Normative references 3 Terms and definitions |
| 17 | 4 Symbols and abbreviated terms 4.1 Symbols |
| 18 | 4.2 Abbreviated terms |
| 19 | 5 Overall considerations 5.1 Functional requirements 5.2 Safety requirements |
| 20 | 5.3 Planning requirements 5.4 Inspection and maintenance requirements 5.5 Analytical tools 6 Design requirements 6.1 Exposure levels 6.1.1 General |
| 21 | 6.1.2 Exposure levels for stationkeeping systems 6.2 Limit states 6.2.1 General 6.2.2 Limit states for stationkeeping systems 6.3 Defining design situations |
| 22 | 6.4 Design situations 6.4.1 General 6.4.2 Design situations for ULS 6.4.2.1 General 6.4.2.2 Permanent moorings 6.4.2.2.1 General 6.4.2.2.2 Permanent moorings with a short design service life |
| 23 | 6.4.2.2.3 Permanent moorings designed for disconnection 6.4.2.2.4 Permanent moorings in proximity to other installations 6.4.2.2.5 Permanent moorings redundancy check condition 6.4.2.3 Mobile moorings 6.4.2.3.1 Mobile moorings for structures not in proximity to other installations 6.4.2.3.2 Mobile moorings for structures in proximity to other installations 6.4.2.3.3 Mobile moorings redundancy check condition 6.4.3 Design situations for SLS |
| 24 | 6.4.4 Design situations for FLS 6.4.5 Design situations for ALS 7 Actions 7.1 General 7.2 Site-specific data requirements 7.2.1 Data collection and analysis |
| 25 | 7.2.2 Water depth 7.2.3 Soil and sea floor conditions 7.2.4 Wave statistics 7.2.5 Wind statistics 7.2.6 Current profile 7.2.7 Atmospheric icing 7.2.8 Marine growth 7.3 Environmental actions on mooring lines 7.3.1 General 7.3.2 Current-induced actions |
| 26 | 7.3.3 Ice-induced actions 7.3.4 Vortex-induced vibrations of mooring lines 7.4 Indirect actions 7.4.1 General 7.4.2 Frequency ranges 7.4.3 Wave-induced actions |
| 27 | 7.4.4 Wind-induced actions 7.4.5 Current-induced actions 7.4.6 Directional distribution 7.4.7 Vortex-induced motions of floating structures |
| 28 | 8 Mooring analysis 8.1 Basic considerations 8.1.1 Introduction 8.1.2 Mooring analysis conditions 8.1.2.1 General 8.1.2.2 Intact condition 8.1.2.3 Redundancy check condition 8.1.2.4 Transient condition |
| 29 | 8.1.2.5 Recommended analysis methods and conditions 8.2 Floating structure offset 8.2.1 General 8.2.2 Mean offset 8.2.3 Extreme values of offset |
| 30 | 8.3 Floating structure response 8.3.1 Analysis methods 8.3.1.1 General |
| 31 | 8.3.1.2 Frequency-domain approach 8.3.1.3 Time-domain approach 8.3.1.4 Combined time-domain and frequency-domain approach 8.3.2 Extreme value statistics |
| 32 | 8.3.3 Lowfrequency damping 8.3.4 Riser considerations |
| 33 | 8.3.5 Vortex-induced motion considerations 8.3.5.1 General 8.3.5.2 Design criteria for VIM strength analysis |
| 34 | 8.3.5.3 VIM strength analysis method 8.3.5.4 Basic considerations for VIM fatigue analysis 8.3.5.5 VIM fatigue analysis for long term and single extreme events |
| 35 | 8.3.5.6 VIM chain fatigue and wear 8.4 Mooring line response 8.4.1 General 8.4.2 Quasi-static analysis 8.4.3 Dynamic analysis |
| 36 | 8.5 Line tension 8.5.1 Mean tension 8.5.2 Extreme values of tension 8.5.3 Design checks 8.5.4 Tension for fatigue analysis 8.6 Line length and geometry constraints |
| 37 | 8.7 Anchor forces 8.8 Typical mooring configuration analysis and assessment 8.8.1 Frequency-domain analysis for spread mooring systems 8.8.2 Frequency-domain analysis for single point mooring systems 8.8.3 Time-domain analysis |
| 38 | 8.9 Thruster-assisted moorings 8.9.1 General 8.9.2 Analysis conditions 8.9.3 Determination of allowable thrust 8.9.4 Load sharing 8.9.4.1 General |
| 39 | 8.9.4.2 Mean load reduction method 8.9.4.3 Heading control and surge damping 8.9.4.4 System dynamic analysis 8.10 Transient analysis of floating structure motions 8.10.1 General 8.10.2 Combined time and frequency-domain analyses |
| 40 | 8.10.3 Time-domain analysis 9 Fatigue analysis 9.1 Basic considerations 9.2 Fatigue resistance 9.2.1 Wire rope, chain and connecting links |
| 41 | 9.2.2 T-N curves |
| 42 | 9.2.3 Tension-tension (T-T) fatigue 9.2.4 Bending-tension (B-T) and free bending fatigue 9.3 Fatigue analysis procedure 9.3.1 General |
| 43 | 9.3.2 Cumulative fatigue damage 9.3.3 Fatigue damage assessment 9.3.3.1 General |
| 44 | 9.3.3.2 Tension range calculation |
| 45 | 9.3.3.3 Combining wave-frequency and lowfrequency tensions 9.3.3.3.1 General 9.3.3.3.2 Simple summation |
| 46 | 9.3.3.3.3 Combined spectrum |
| 47 | 9.3.3.3.4 Combined spectrum with dual narrow-banded correction factor 9.3.3.4 Accounting for mean value of tension in wire rope 10 Design criteria 10.1 Floating structure offset |
| 48 | 10.2 Line tension limit 10.3 Grounded line length 10.4 Anchoring systems 10.4.1 General 10.4.2 Drag anchors |
| 49 | 10.4.3 Anchor piles 10.4.4 Other anchor types |
| 50 | 10.4.5 Chain and wire rope holding capacity 10.4.6 Mooring test load 10.4.6.1 General 10.4.6.2 Permanent moorings |
| 51 | 10.4.6.3 Mobile moorings 10.5 Fatigue safety factor 10.6 Corrosion and wear |
| 52 | 10.7 Clearances 10.7.1 Basic considerations 10.7.2 Mooring line crossing pipeline 10.7.3 Horizontal distance between installations 10.7.4 Clearance between a drag anchor and other installations 10.8 Supporting structures 11 Mooring hardware 11.1 Mooring line components 11.1.1 General 11.1.2 Wire rope |
| 53 | 11.1.3 Chain 11.1.4 Connecting links 11.1.5 Spring buoys 11.1.6 Anchors 11.2 Winching equipment 11.3 Monitoring equipment 11.3.1 Line tension |
| 54 | 11.3.2 Line payout 11.3.3 Floating structure position 11.3.4 Floating structure heading 12 In-service inspection, monitoring and maintenance 12.1 General 12.2 Mobile moorings 12.3 Permanent moorings 12.3.1 General |
| 55 | 12.3.2 Structural integrity management system philosophies 12.3.2.1 General 12.3.2.2 Database development and data acquisition |
| 56 | 12.3.2.3 Evaluation 12.3.2.4 Planning 12.3.2.5 Implementation 12.3.2.6 Verification 13 Dynamic positioning system 13.1 Basic considerations 13.1.1 General |
| 57 | 13.1.2 DP equipment 13.2 Design and analysis 13.2.1 Failure modes and effects analysis 13.2.2 DP equipment classes |
| 58 | 13.3 Design, test and maintenance 13.4 Operating personnel 13.5 Determination of stationkeeping capability 14 Synthetic fibre rope mooring 14.1 Basic considerations |
| 59 | 14.2 Fibre rope mooring analysis 14.2.1 Fibre rope tension-elongation properties 14.2.2 Fibre rope line length |
| 60 | 14.3 Fatigue analysis 14.3.1 Tension-tension fatigue resistance 14.3.2 Axial compression fatigue 14.4 Creep analysis 14.5 Design criteria 14.5.1 Maximum line tension 14.5.2 Minimum line tension 14.5.2.1 General 14.5.2.2 Polyester and HMPE |
| 61 | 14.5.2.3 Aramid and other materials 14.5.2.4 Minimum mean tensions for pre-deployed lines 14.5.3 Fatigue 14.5.4 Creep elongation 14.6 Model testing |
