SIST EN 1474-3:2009

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Anlagen und Ausrüstung für Flüssigerdgas - Auslegung und Prüfung von Schiffsübergabesystemen - Teil 3: Offshore-ÜbergabesystemeInstallations et équipements de gaz naturel liquéfié - Conception et essais des systemes de transfert marins - Partie 3: Systemes de transfert offshoreInstallation and equipment for liquefied natural gas - Design and testing of marine transfer systems - Part 3: Offshore transfer systems75.200Petroleum products and natural gas handling equipmentICS:Ta slovenski standard je istoveten z:EN 1474-3:2008SIST EN 1474-3:2009en,fr,de01-marec-2009SIST EN 1474-3:2009SLOVENSKI
STANDARD



SIST EN 1474-3:2009



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1474-3December 2008ICS 75.200 English VersionInstallation and equipment for liquefied natural gas - Design andtesting of marine transfer systems - Part 3: Offshore transfersystemsInstallations et équipements de gaz naturel liquéfié -Conception et essais des systèmes de transfert marins -Partie 3: Systèmes de transfert offshoreAnlagen und Ausrüstung für Flüssigerdgas - Auslegung undPrüfung von Schiffsübergabesystemen - Teil 3: Offshore-ÜbergabesystemeThis European Standard was approved by CEN on 1 November 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2008 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1474-3:2008: ESIST EN 1474-3:2009



EN 1474-3:2008 (E) 2 Contents Page Foreword.4 1 Scope.5 2 Normative references.5 3 Terms and definitions.5 4 Definition and ability of the LNG transfer systems.7 4.1 System requirement.7 4.2 Overall safety philosophy.7 4.3 Overall functional targets and requirements.8 4.4 Design principles and risk assessment methodology.8 4.5 Design principles.9 4.6 Risk assessment.10 4.6.1 Hazard identification.10 4.6.2 Risk analysis.11 4.6.3 Risk assessment.11 4.6.4 Acceptance criteria.12 4.7 Safety-critical elements.12 4.8 Performance standards.12 4.9 Risk reduction.12 5 New design qualification.13 5.1 Design qualification.13 5.2 Technology assessment.14 5.3 Risk assessment: failure mode identification.14 5.4 Analysis and testing.14 5.5 Reliability analysis.16 5.6 Compliance statements.16 6 Design basis and criteria of a LNG transfer system.16 6.1 General.16 6.2 Supporting structures and equipment.17 6.3 Transfer line diameter and product data.17 6.4 Dimensions and clearances.17 6.5 Stress analysis.18 6.6 Dynamic behaviour (cyclic motions amplitude, speed and fatigue).18 6.7 Special loads situations.18 6.8 Product swivel joints and structural bearings.19 6.9 Connecting/disconnecting device.19 6.10 Handling for connection, disconnection, storing.19 6.11 Communications, evacuation and rescue.19 6.12 Others.20 7 Safety precautions.21 7.1 Introduction.21 7.2 Communication.21 7.3 Approach and control monitoring berthing and connection process.21 7.4 Position monitoring, alarm and shut down system for the LNG transfer systems.22 7.5 ERS system.22 7.6 Safety interfaces.22 7.7 Control of fluid transfer.23 8 Connection with the LNGC.23 8.1 Two main categories of LNG transfer systems are anticipated:.23 SIST EN 1474-3:2009



EN 1474-3:2008 (E) 3 8.2 Additional requirements for the ship shall address:.23 8.3 In order maximise the level of standardisation the following guidance shall be observed:.24 8.4 Systems and equipment for the position control of the LNG carrier during berthing, connection and transfer:.24 9 Operating and control design.24 10 Inspection and tests.24 11 Quality assurance and control.24 12 Documentation.24 Annex A (normative)
Procedure for deviation from the full standard.26 Bibliography.27
SIST EN 1474-3:2009



EN 1474-3:2008 (E) 4 Foreword This document (EN 1474-3:2008) has been prepared by Technical Committee CEN/TC 282 “Installation and equipment for LNG”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 2009, and conflicting national standards shall be withdrawn at the latest by June 2009. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This European Standard consists in 3 parts: EN 1474-1: Installation and equipment for liquefied natural gas — Design and testing of marine transfer systems — Part 1: Design and testing of transfer arms EN 1474-2: Installation and equipment for liquefied natural gas — Design and testing of marine transfer systems — Part 2: Design and testing of transfer hoses EN 1474-3, Installation and equipment for liquefied natural gas — Design and testing of marine transfer systems — Part 3: Offshore transfer systems According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
SIST EN 1474-3:2009



EN 1474-3:2008 (E) 5 1 Scope This European Standard gives general guidelines for the design of liquefied natural gas (LNG) transfer systems intended for use on offshore transfer facilities or on coastal weather exposed transfer facilities. The transfer facilities considered may be between floating units, or between floating and fixed units. The specific component details of the LNG transfer systems are not covered by this European Standard. Reference is made to EN 1474-1 and EN 1474-2 where appropriate. As a general statement the present standard applies to all transfer systems given in the scope. However, some transfer system designs may require a deviation from the full standard as described in normative
Annex A. 2 Normative 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. EN 1473, Installation and equipment for liquefied natural gas — Design of onshore installations EN 1474-1:2008, Installation and equipment for liquefied natural gas — Part 1: Design and testing of transfer arms EN 1474-2:2008, Installation and equipment for liquefied natural gas — Part 2: Design and testing of transfer hoses EN 1532, Installation and equipment for liquefied natural gas — Ship to shore interface EN 61511-1, Functional safety — Safety instrumented systems for the process industry sector — Part 1: Framework, definitions, system, hardware and software requirements (IEC 61511-1:2003 + corrigendum 2004) EN 61511-2, Functional safety — Safety instrumented systems for the process industry sector — Part 2: Guidelines for the application of IEC 61511-1 (IEC 61511-2:2003) EN 61511-3, Functional safety — Safety instrumented systems for the process industry sector — Part 3: Guidance for the determination of the required safety integrity levels (IEC 61511-3:2003 + corrigendum 2004) EN ISO 9000, Quality management systems — Fundamentals and vocabulary (ISO 9000:2005) EN ISO 9001, Quality management systems — Requirements (ISO 9001:2000) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 attitude various modes of use and/or location of the transfer system (i.e. manoeuvring, stowed, connected, washing, hydrostatic test and maintenance). The transfer system may take several positions for each attitude NOTE Transfer system see 3.18. SIST EN 1474-3:2009



EN 1474-3:2008 (E) 6 3.2 bank of transfer lines all the transfer lines on the transfer system NOTE Transfer lines see 3.17. 3.3 cargo manifold (or manifold) pipe assembly mounted on board LNG carrier to which the outboard flanges of the transfer system are connected 3.4 coupler manual or hydraulic mechanical device used to connect the transfer system to the LNG carrier’s manifold NOTE This device, when not employing a bolted connection, is often also referred to as QCDC i.e. quick connect/disconnect coupler. 3.5 design pressure pressure for which the transfer system is designed 3.6 design temperature range of temperatures for which the transfer system is designed 3.7 emergency release coupling (ERC) device to provide a means of quick release of the transfer system when such action is required only as an emergency measure 3.8 emergency release system (ERS) system that provides a positive means of quick release of transfer system and safe isolation of LNG carrier and transfer system. An ERS normally contain one or several ERC’s 3.9 emergency shut down (ESD) method that safely and effectively stops the transfer of LNG and vapour between the LNG carrier and the LNG terminal 3.10 envelope, operating (or operating envelope) volume in which the presentation flange(s) of a (group of) transfer line(s) is (are) required to operate 3.11 LNGC mooring LNGC mooring arrangement on the terminal NOTE The possible mooring configuration includes: conventional mooring (jetty, quay, GBS/Gravity Base Structure, …), Multi-Buoy Mooring/Conventional Buoy Mooring (MBM/CBM, …), side-by-side mooring of two floating units, tandem mooring (single or double hawsers arrangement, “crowfoot” hawser arrangement, rigid or articulated yokes, …), DP (Dynamic Positioning) or semi DP systems. 3.12 LNGC First Order Motions heave, pitch, roll, surge, sway, yaw NOTE These motions apply as well for a floating LNG terminal. SIST EN 1474-3:2009



EN 1474-3:2008 (E) 7 3.13 LNGC Second Order Motions other motions of the LNGC when moored on the LNG terminal that have to be taken into account in the design and operations like fishtailing, jack-knifing NOTE These motions results from the behaviour of the ship due to the mooring configuration. They apply in combination with the LNGC motions in 3.12. 3.14 LNG terminal LNG plant with liquefaction or re-gasification facilities NOTE The LNG transfer system is part of the LNG plant. The LNG terminal is supporting the transfer system that can be onshore or offshore mounted on a fixed or floating structure with or without storage facility. 3.15 performance standard statement, which can be expressed in qualitative or quantitative terms, of the performance required of a system, item of equipment, person or procedure, and which is used as the basis for establishing the design specification, manufacturing and installation for the safe operation through the life cycle of the installation 3.16 surge pressure rapid change in pressure as a consequence of a change in flow rate in the transfer system 3.17 transfer line (or product line) articulated piping, the transfer hose and swivels if any, or a combination of the piping and hose, allowing the transfer of LNG and natural gas between the LNGC and the LNG terminal 3.18 transfer system LNG and natural gas transfer system, the transfer system comprises the transfer lines and all their supporting structure including the supporting structure on the LNG terminal, complete with all accessories, control/detection systems, energy supply NOTE The transfer systems have typically mobile and fixed parts. 4 Definition and ability of the LNG transfer systems 4.1 System requirement A description of the system and the operation shall be established. Any system for offshore or coastal weather exposed operations, including LNG-C mooring and transfer systems, has to be considered as new development, should it incorporate arms or hoses. Development of specific performance standards for compliance would be required. These performance standards would be developed based on risk assessment techniques (see Clause 5). 4.2 Overall safety philosophy An overall safety philosophy shall be established and documented by the owner, reflecting applicable legislation, owner requirements, industry standards and best practices. The overall safety philosophy shall address the risk categorisation and also acceptance criteria. It shall be complemented as necessary, prior to commissioning, with vendor specific recommendation concerning precautions for use of the systems or parts of it. It shall be consistent with the terminal general safety philosophy. SIST EN 1474-3:2009



EN 1474-3:2008 (E) 8 4.3 Overall functional targets and requirements The overall functional requirements for the cargo transfer system shall be identified and documented. As a minimum the following capabilities shall be addressed for the different operational phases:  berthing configuration (tandem or side by side or single point mooring, …);  additional requirements to the manifold on the LNG carrier when required (e.g. tandem or single point mooring offloading);  berthing and mooring procedure;  procedure for connection, transfer and disconnect including emergency release;  process of monitoring and management of continual relative movements between vessels (CPMS, telemetry etc.);  procedure and facilities handling, lifting and
storing of transfer equipment;  transfer capacities for LNG and vapour return (volume flow, pressure, temperature);  availability requirements;  requirements for the ESD system (sequence, timing, process responses);  regulatory requirements;  requirements related to local regulations, flag if any;  owner QA requirements, such as classification, certification requirements. 4.4 Design principles and risk assessment methodology A risk assessment shall be conducted as part of the overall assessment of the LNG transfer system. In general for the overall system assessment the following objectives would apply:  evaluation of the design and operational procedures;  determination of the limiting conditions for the offloading operations;  assessment of safety and operability via risk assessment techniques;  determination of regulatory compliance (certification, classification): this section describes the design principles and the approach to establish design requirements for the transfer system. Risks shall be assessed in accordance with recognized methods and risk studies shall be performed by qualified and competent persons with the necessary understanding of risk, and the risk assessment process. The risk assessment methodology and tools, assumptions, and system boundary limits shall be clearly documented. A risk based approach shall be used to ensure that:  critical elements and operations are identified;  performance standards are defined when applicable;  controls and mitigating measures are identified; SIST EN 1474-3:2009



EN 1474-3:2008 (E) 9  aspects of new technology, as defined below, are identified and qualified according to requirements in Clause 5. In this context, new technology is defined as technology that is not proven. Proven technology has a documented track record for a defined application. Information guidance can be found in the Bibliography. The identification of new technology should be done by dividing the technology into manageable elements and classifying the technology elements with respect to newness according to Table 1 considering the status of the technology as such, and its application area. Table 1 — Example for classifying the technology elements Technology status Application area Proven Limited field history New or unproven Known
1 2 3 New 2 3 4 This classification implies the following: 1) no new technical uncertainties; 2) new technical uncertainties; 3) new technical challenges; 4) demanding new technical challenges. This classification applies to the totality of the applied technology as well as each separate part, function and subsystem forming it. It shall be used to highlight where care needs to be taken due to limited field history. Technology in Class 1 is proven technology where proven methods for qualification, tests, calculations and analysis can be used to document margins. Technology defined as Class 2 to 4 is defined as new technology, and shall be qualified according to Clause 5. The distinguishing between 2, 3 and 4 makes it possible to focus on the areas of concern. 4.5 Design principles The following principles shall apply in addition to the identified requirements from a risk assessment: General 1) Transfer system shall be designed, constructed and maintained with sufficient integrity to withstand operational and environmental loading throughout the system lifecycle, refer to Clause 6). 2) Systems and structures shall be designed with suitable functionality and survivability for prevention, detection, control and mitigation of foreseeable accident events affecting the installation. 3) Systems and structures shall be designed in compliance with internationally accepted codes and standards. 4) Where novel transfer solutions (new technology or novel application of known technology) are intended to be used, this technology is to undergo a recognized qualification procedure. Refer to Clause 5. SIST EN 1474-3:2009



EN 1474-3:2008 (E) 10 Specific safety issues 1) Escalation of accidental event to LNG Terminal or LNG carrier which are not affected by the initiating event shall be avoided/mitigated. 2) Effective protection and escape shall be provided to safeguard all personnel. 4.6 Risk assessment 4.6.1 Hazard identification Hazards with the potential to threaten safety of personnel or integrity of the installation shall be identified. The hazard identification should include all normal operating and emergency operations, such as operation, maintenance, shutdown, emergency disconnection and identify hazards according to the risk categories derived from the functional requirements and safety philosophy. Typical hazard identification techniques include e.g. HAZOPs, FMEA, safety reviews etc. Risk categories shall as a minimum include risk to personnel, environmental releases, and damage to the installation or the LNG carrier. Risks related to loss of production, downtime and reputation may be included. A typical, but not necessarily exhaustive, list of hazards includes:  loss of containment, leading to hydrocarbon releases with potential to result in fires or explosions;  collisions (e.g. damage to LNG carrier, terminal and transfer system);  damage due to cryogenic leakage on surfaces (e.g. embrittlement) and at sea (e.g. risk of rapid transition phase);  helicopter crash;  structural and or foundation failure;  loss of stability and buoyancy;  dropped objects;  mooring, and station keeping of approaching vessel during connection, transfer and disconnect;  extreme weather causing excessive relative motions between the installations;  failure in supporting systems (power, hydraulics, monitoring). The hazard identification process shall address and focus on the specific issues for cargo transfer systems including:  side by side offloading;  tandem offloading;  single point Mooring offloading;  other offloading systems;  mooring configurations for the above; SIST EN 1474-3:2009



EN 1474-3:2008 (E) 11  transfer lines related failures;  connect/disconnect and flanged connections failures;  constant position monitoring systems (CPMS) and operations;  emergency release systems (ERS);  safe isolation and inerting operations;  issues related to cargo tank overpressurization (and other containment system issues) during offloading;  load bearing structures;  containment systems for process fluids;  actual weather limitations for operation;  anticipated weather change. The results of the hazard identification and any relevant assumptions shall be documented (see 5.2). 4.6.2 Risk analysis Hazard assessment shall be performed according to the method described in EN 1473. The identified hazards can be ranked based on combination of likely frequency and consequence. Insignificant risks may be eliminated from further evaluation provided that relevant assumptions are documented. Risks shall not be subdivided such that individual risk elements appear trivial, whereas collectively still represent a substantial risk. Consideration of frequency includes identification of initiating events, and combinations of events, which could lead to a hazard. The likelihood of occurrence of such events can be found from historical or other appropriate data. The consequences of the hazards shall include analysis of the effects of accidents or accidental events on the safety of personnel and integrity of the installation. The availability and vulnerability of key prevention and protection systems shall be assessed with respect to required functionality against each of the identified hazards. Any significant findings shall be consistent with assumptions made in other parts of the risk analysis and assessment. The hazards remaining after the screening exercise are termed significant major hazards. The selection of significant major hazards, including assumptions made as part of the ranking process, shall be documented. NOTE A semi-quantitative or a qualitative approach is recommended for the ranking of risk when s relevant failure data required for a quantitative assessment is not available for novel applications tools such as HAZOPs, fault trees and engineering judgement may be effectively applied to screen out hazards that are trivial or of minor significance. This includes hazards and escalations which are extremely unlikely to occur (e.g. due to the effectiveness of prevention measures in place), or which will have minor consequence to personnel or property. 4.6.3 Risk assessment The risks from significant major hazards shall be assessed and considered together in order to show the relative contribution of different hazards to the total calculated risks. SIST EN 1474-3:2009



EN 1474-3:2008 (E) 12 The annual risks shall be assessed against predefined risk acceptance criteria. If necessary, risk reduction measures shall be applied in order to meet the acceptance criteria. 4.6.4 Acceptance criteria Acceptance criteria shall be defined before performing the risk analysis. It is the owner responsibility to ensure that the acceptance criteria reflecting the functional requirements and overall safety philosophy are in line with regulatory requirements and best practices (refer to 4.2 and 4.3). The criteria shall take into account both the probability and consequences of significant major hazards. Meeting the acceptance criteria will establish the basis for identification of safety-critical elements and selection of performance s
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