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BS EN ISO 20257-1:2020

BS EN ISO 20257-1:2020

$256.21

Installation and equipment for liquefied natural gas. Design of floating LNG installations – General requirements

Published By Publication Date Number of Pages
BSI 2020 164
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This document provides requirements and guidance for the design and operation of floating liquefied natural gas (LNG) installations, including installations for the liquefaction, storage, vaporisation, transfer and handling of LNG, in order to have a safe and environmentally acceptable design and operation of floating LNG installations.

This document is applicable to:

  • floating LNG liquefaction installations (plant) — FLNG;

  • floating LNG regasification installations (plant) — FSRU;

  • floating storage units — FSU.

This document is applicable to offshore, near-shore or docked floating LNG installations.

This document includes any jetty in the scope in case of docked floating LNG installations with regards to the mooring. This document briefly describes floating LNG mooring concepts.

This document is applicable to both newbuilt and converted floating LNG installations, and addresses specific requirements.

This document is not applicable to:

  • onshore LNG storage, liquefaction and/or regasification installations/plants, except for docked FSRU and/or FLNG installations;

  • offshore LNG plants based on non-floating structure (such as gravity based structure [GBS] principle); and

  • support onshore based facilities (such as support vessels, tugs, etc.).

This document is not intended for design floating power generation facilities though relevant parts of this document can be used.

This document is not intended to cover LNG as fuel bunkering applications.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 European foreword
Endorsement notice
9 Foreword
10 Introduction
11 1 Scope
2 Normative references
13 3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
18 3.2 Abbreviated terms
21 4 Basis of design
4.1 Site and meteocean conditions
4.1.1 Site study
23 4.1.2 Earthquake
4.1.3 Location
24 4.1.4 Other studies
4.2 Design criteria
4.2.1 General
25 4.2.2 Topsides
26 4.2.3 Transfer systems
30 4.2.4 Hull
32 4.2.5 LNG storage
33 4.2.6 Mooring
35 4.2.7 Pipe-work
36 5 Health, safety and the environment
5.1 General
5.1.1 Main objectives
37 5.1.2 Main principles
5.2 Identification of safety and environmental barriers and design requirements
5.2.1 General
38 5.2.2 Purpose
5.2.3 Safety and environmental barriers
39 5.2.4 Generic barriers
5.2.5 Safety and environmental barriers identification process
40 5.2.6 Safety and environmental barriers design requirements
41 5.2.7 Safety and environmental barriers design requirements certification
5.3 Environmental considerations
5.3.1 General
5.3.2 Floating LNG installations specificities
42 5.3.3 Environmental aspects identification
5.3.4 Environmental design review
5.3.5 Environmental design requirements
49 5.4 Safety considerations
5.4.1 General
50 5.4.2 Safety strategies and philosophies
5.4.3 Safety reviews
53 5.4.4 Qualitative risk assessment, QRA and specific safety studies
57 5.4.5 Risk prevention measures (typical list)
70 5.4.6 Emergency response
72 5.5 Occupational health and industrial hygiene considerations
5.5.1 Occupational health and industrial hygiene aspects identification
5.5.2 Chemical exposure
73 5.5.3 Biological factor
74 5.5.4 Legionella
5.5.5 Thermal stress
75 5.5.6 Hot/cold surfaces
5.5.7 Support functions to operators – Project with permanent operators on-board or in the facility
5.5.8 Lighting
76 5.5.9 Water availability and quality intended for human consumption
5.5.10 Noise and vibration
78 5.6 Ergonomics and human factor
6 Mooring and stationkeeping
6.1 General
79 6.2 Permanent stationkeeping in open waters
6.2.1 Stationkeeping concepts
80 6.2.2 Design requirements
6.3 Permanent stationkeeping in nearshore or docked conditions
6.3.1 Stationkeeping concepts
81 6.3.2 Design requirements
82 6.3.3 Emergency departure of floating LNG installation
6.4 Mooring systems for special project design conditions
6.4.1 Disconnectable mooring
83 6.4.2 Permanent mooring for a limited project life
6.5 Short-duration mooring of a visiting LNGC for loading/unloading
6.5.1 General
84 6.5.2 Ship-to-ship mooring in open waters
6.5.3 Mooring in docked or nearshore conditions
6.5.4 Mooring to an SPM terminal
6.5.5 Design requirements
85 6.6 Infrastucture design for jetty moorings
6.6.1 General
6.6.2 Jetty elevation
6.6.3 Corrosion protection of the marine infrastructure
86 6.6.4 LNG spillage containment
6.6.5 Power supply from/to jetty to the FSRU/FLNG
6.6.6 Navigation aids
6.6.7 Emergency response and evacuation route
6.7 Transfer of material and personnel
87 7 Hull design
7.1 Hull structural design
7.1.1 Design philosophy
7.1.2 Design methods
7.1.3 Codes and standards
88 7.1.4 Limit states for floating structures
7.1.5 Design situations for ULS
7.1.6 Design situations for SLS
89 7.1.7 Design situations for FLS
7.1.8 Design situations for ALS
7.1.9 Site-specific design
90 7.1.10 Cargo containment loads
7.1.11 Fatigue
7.1.12 Slamming
7.1.13 Green water
91 7.1.14 Topsides and external loads
7.1.15 Accidental loads
7.2 Stability and watertight integrity
7.2.1 General
7.2.2 Stability
92 7.2.3 Watertight and weathertight integrity
8 LNG storage
8.1 General
93 8.2 Sloshing loads
8.2.1 Intermediate filling levels: Operating conditions of FSRU/FLNG
94 8.2.2 Intermediate filling levels: Operating conditions of cargo transfers (STS)
8.3 Boil-off gas management
8.4 Rollover prevention management
8.4.1 Background
95 8.4.2 Detection and prevention
8.5 Vent systems for LNG storage
8.5.1 General
8.5.2 Pressure relief systems
96 8.5.3 Vacuum relief systems
97 9 LNG transfer system
9.1 Functional requirements
98 9.2 Design of transfer systems
9.2.1 Operating envelope
99 9.2.2 Transfer system design
101 10 Boil-off gas handling and recovery
10.1 General
10.2 BOG collection system
102 10.3 System of gas return to LNGC or to FLNG facility
10.4 Boil-off gas recovery
10.5 Gas compressor
10.6 Flare/vent
11 Low temperature pipework
11.1 General
103 11.2 Piping components
11.2.1 General
11.3 Pipe
11.3.1 General
11.3.2 Pipe joints
104 11.3.3 Pipe supports
11.3.4 Compensation of contractions due to cold
11.3.5 Differential displacement between offshore structures
11.4 Valves
105 11.4.1 Relief valves
11.5 Thermal insulation
11.5.1 General
106 11.5.2 Piping insulation
11.5.3 Fire behaviour
11.5.4 Gas absorption
11.5.5 Moisture resistance
107 11.5.6 Differential movements
11.5.7 Thickness determination
11.6 Prevention of zinc contamination of austenitic steel
12 Utilities systems
12.1 Classification of systems
12.1.1 Essential services
108 12.1.2 Emergency services
12.2 Electrical
12.2.1 Design and engineering principles
109 12.2.2 Electrical system design
112 12.2.3 Design and selection of equipment and cables
113 12.3 Instrument air system
12.4 Hydraulic systems
13 Process and safety control and monitoring systems
13.1 General description
114 13.2 Process control system
13.2.1 Principle
13.2.2 Process control system design
13.3 Marine control system
13.4 Interfaces floating LNG installation/onshore
115 13.5 Safety control system (safety instrumented and F&G control systems)
13.5.1 Principle
13.5.2 ESD and safety actions
116 13.5.3 System capabilities
13.6 Closed circuit TV
13.7 Metering
13.7.1 Background
117 13.7.2 Cargo metering
13.8 Communications
13.9 Environmental monitoring and control
118 14 Security management
14.1 General
14.2 Offshore access
14.3 Onshore access
119 15 Commissioning
15.1 General
15.2 Systemization and schedule
15.3 Implementation
120 15.4 Safety
121 15.5 Organization
15.6 Handover
15.7 Start-up and performance test
16 Inspection and maintenance
16.1 General
122 16.2 Specific requirements for floating LNG installations
16.2.1 Cargo tank
16.2.2 Mooring
16.2.3 Process piping systems
16.2.4 Transfer systems
17 Preservation and corrosion protection
17.1 Specific requirements for non-seagoing vessels
17.2 Painting and coating
123 17.3 Cathodic protection
17.4 Impact of use of seawater as heating medium and active fire protection
18 Preparation for operations
19 Specific requirements for conversion of existing installations to floating LNG installations
125 Annex A (informative) Risk-based analysis
129 Annex B (informative) Safety studies
136 Annex C (normative) Definition of reference flow rates for LNG boil-off calculations
140 Annex D (normative) Design basis and criteria of an LNG transfer system
152 Annex E (informative) Seismic classification
155 Annex F (informative) Assessment of novel technology
158 Annex G (informative) Environmental, occupational health and industrial hygiene aspects
163 Bibliography

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BS EN ISO 20257-1:2020
$256.21