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Notes on engineering details

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Notes on Engineering Details issued by DNV GL amend or correct existing normative documents; eventual gaps are closed and further guidance is given. The notes are available for following categories like load assumptions, safety system & protective and monitoring devices, rotor blades and machinery components, support structure, electrical installations and project certification. Wherever possible the notes are included in later updates of the normative documents referenced on page one of every note.

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General

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0.a D-Design Assessment
File: PDF [29 kB]

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0.b Statement of Compliance for the Implementation of the Design Requirements in Production and Erection (IPE), Renewal
File: PDF [44 kB]

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0.c Modifications in Guideline for wind turbines, loads and strength analysis for tower and foundation, Edition March 2004, German Institute for Civil Engineering - DIBt
File: PDF [26 kB]

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0.d GL Renewables Certification Technical Note "Gutachtliche Stellungnahmen (Expert's Reports) according to DIBt Guideline, Scope of Assessment"
File: PDF [180 kB]

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0.e Erratum in GL 2010
File: PDF [105 kB]

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0.f Certification of Wind Turbines for hot climate application
File: PDF [141 kB]

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0.g Update concerning Chapter 1, Section 1.2.2.5 Implementation of the design-related requirements in IPE
Obsolete

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0.h Clarification of the application of transition periods in GL Guideline for the Certification of Offshore Wind Turbines
File: PDF [52 kB]

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0.i Clarification of the application of transition periods in GL Guideline for WT - GL-IV-1
File: PDF [48 kB]

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0.j Is a design change a "minor change" or a "major/relevant change"?
File: PDF [533 kB]

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0.k Wind Turbine operation down to –20°C
File: PDF [53 kB]

1. Load Assumptions

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1.a Requirements additional to those in the GL Renewables Certification Guideline 2003 in order to fulfil IEC 61400-1, ed. 1999 and DIBt guideline (March 2004)
File: PDF [51 kB]

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1.b Alternative interpretation of load case DLC 6.1 of IEC 61400-1, edition 2, applying EN 61400-1, November 2005
File: PDF [23 kB]

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1.c. Load assumptions at extreme temperatures
Obsolete

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1.d Overall damping for piled offshore support structures
File: PDF [165 kB]

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1.e Load assumptions according to GL 2005
File: PDF [107 kB]

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1.f Operational vibration monitoring
File: PDF [122 kB]

2. Safety System & Protective and Monitoring Devices

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2.a Offshore Wind Turbine Certification, manuals for sea transport and offshore installation
File: PDF [24 kB]

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2.b Commissioning manual for wind turbines, test to verify independence of safety systems
File: PDF [20 kB]

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2.c CMS at Type Certification for offshore wind energy
File: PDF [22 kB]

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2.d New structure of the certification of the fire protection systems and fire protection implementation and their components respectively
File: PDF [145 kB]

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2.e Cold climate - test of pitch system
File: PDF [115 kB]

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2.f Probability considerations for the internal electrical fault: 2-phased generator short circuit
File: PDF [55 kB]

3. Rotor Blades

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3.a Certification Update from GL Guideline Edition 1999 to Edition 2003/2004
Obsolete

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3.b Verification of inter-fibre failure
File: PDF [140 kB]

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3.c Full scale dynamic blade test acc. to IEC WT01
Obsolete

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3.d Derivation of static blade test loads
File: PDF [202 kB]

4. Machinery Components

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4.a Interpretation of section 7.1.3: Drive train dynamics
File: PDF [139 kB]

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4.b. The removal of faults by repairing components of wind turbines
File: PDF [54 kB]

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4.c Usage of bolts inside the area of material yielding (plastification)empty
File: PDF [33 kB]

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4.d Partial safety factor gamma-M for bolts
File: PDF [28 kB]

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4.e Applicability of section 7.3.5.2 (2) of the "Guideline for the Certification of Offshore Wind Turbines" for the certification of on- and offshore wind turbines
Obsolete

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4.f Gearbox structures
File: PDF [150 kB]

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4.g Automatic lubrication system for yaw gears, minimum safety factors SH against pitting in yaw gears
File: PDF [23 KB]

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4.h Fatigue assessment of welded machinery structures: Permissible Palmgren-Miner damage sum
File: PDF [44 kB]

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4.i Admissible total strain of local plastified areas under extreme loading
File: PDF [44 kB]

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4.j Superposition of plastified areas caused by extreme load with fatigue critical areas
File: PDF [42 kB]

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4.k Requirements for bolted connections with regard to component class one according to IEC 61400-1
File: PDF [56 kB]

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4.l Required documentation for the assessment of large diameter rolling bearing rings and raceways
File: PDF [48 kB]

5. Support Structure

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5.a Fatigue-verification of embedded steel section / welded connection between shell and bottom flange
File: PDF [120 kB]

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empty5.b Inspection Certificates required for structural members for offshore wind turbines
File: PDF [108 kB]

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5.c Quasi-permanent combination of actions for verification of concrete structures for the serviceability-limit-state (SLS)
File: PDF [110 kB]

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5.d Partial safety factors for welded and structural steel for certification according to IEC 61400-1, 3rd Edition
File: PDF [116 kB]

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5.e Determination of stress magnification factor km
File: PDF [134 kB]

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5.f Partial safety factor for buckling of tower shells according to IEC 61400-1, 3rd Edition
File: PDF [112 kB]

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5.g Clarification of design scour depths for GL Offshore Project Certificationempty
File: PDF [62 kB]

6. Electrical Installations

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empty6.a Required amount of receptors in rotor blades
File: PDF [116 kB]

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6.b Erratum in Offshore Guideline
File: PDF [16 kB]

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6.c Transition period from IEC 61400-21 Ed. 1.0 (2001-12) to IEC 61400-21 Ed. 2.0 (2008-08)
File: PDF [117 kB]

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6.d EN 954-1: Circuits for safety-related parts of the control
File: PDF [125 kB]

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6.e Extended applicability of Chapter 8 "Electrical Installations" to offshore substations
File: PDF [112 kB]

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6.f Main frequency converter overvoltage category
File: PDF [112 kB]

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6.g Definition of the system voltage of the machine-side converter
File: PDF [117 kB]

7. Project Certification

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empty7.a "Preliminary Draft" acc. to BSH Standard Design: Certification requirements and extent of examination
File: PDF [119 kB]

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7.b Transition period for implementation of new guideline [2] regarding site specific design assessment
File: PDF [128 kB]

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7.c Marine operations in Offshore Wind Project Certification
File: PDF [128 kB]

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7.d Integration of Type Certificates in Project Certification
File: PDF [87 kB]

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7.e Quality Management System Requirement in Project Certification
File: PDF [115 kB]
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