HSLC & NSC January 2006

Pt.1 Ch.1 General Regulations
Main changes coming into force January 2006:

Sec.2 Scope of Rules and Class Notations

Table B2 has been modified to include the supplementary class notation (navdist) and the class notation F-NAVAL has been substituted by FIRENAV.

Pt.3 Ch.4 Hull Structural Design, Fibre Composite
Main changes coming into force July 2006:

Sandwich Constructions

Sec.5 and Sec.10: Two existing formulations have been revised to improve their accuracy. This refers to the calculation of the bending moment in the longitudinal direction of sandwich panels and for shear buckling of single skin laminates.

Pt.4 Ch.2 Rotating Machinery, General
Main changes coming into force July 2006:

Sec.1 Introduction

Sec.2 Certification Principles

In item A102, text concerning the 200 kW and 500 kW auxiliary machinery limitations has been made into a new Guidance note.
In item C104, new text has been added to clarify that the MSA shall contain reference to Sec.3 A102.

Sec.3 Design and Documentation

In item A205, new text has been added to clarify that blanks for gears may be considered as equivalent to separate forgings, provided that a special forging process has been approved by DNV.
A new sub-section element, A300 "Welding specification" has been added and the new item A301 details the welding specification.
Item B102 has been rewritten to clarify the requirements for a NV certificate.
In item B202, text concerning cleanliness specifications has been made into a Guidance note.

Sec.4 Electrical Power Generation

To meet the requirements in SOLAS Ch.II-1/Reg.41.5 and Ch.II-1/Reg.41.2 and IACS UI SC157, text has been added in item A104 and text has been removed in item A105.

Pt.4 Ch.3 Rotating Machinery, Drivers
Main changes coming into force July 2006:

General

Welded cylinder frames designs have been covered.
New IACS safety valves and crankcase ventilation requirements have been adopted.
Turbocharger monitoring: requirements in conflict with current practice have been removed, and requirements have been clarified.
Starting air system: clarification of requirements.
Workshop testing: to allow for current practice for smaller engines, minimum time limit for the load steps has been removed.
Crankcase protection device: differentiation in requirements between crosshead and trunk engines has been made.
Assembly and installation practice for crosshead engines has been accounted for.
Torsional vibrations: clarification of requirements.
Steam turbines: corrected IACS requirements have been adopted.

Pt.4 Ch.4 Rotating Machinery, Power Transmission
Main changes coming into force July 2006

General

New IACS requirements for shafts have been adopted.
Redefinition of “load cycles” for Baltic ice classes has been made. ICE -05 to -15 have to be applied in gear rating calculations and the requirements have been aligned with Pt.5 Ch.1.
The ice criteria for elastic couplings have been updated.
Monitoring requirements have been changed.

Sec.1 Shafting

B200: "simplified method" for calculating shaft dimensions, has been fully revised.
B300: modified requirements for flanged connection in consequence of and reflecting the changed shaft dimension calculation above, have been introduced.
B400: requirements relating to all shrink fit connections (incl. propeller) have been totally revised, with new formulae introduced for "pull up lengths" and diametrical expansions.
New friction capacity criteria for keyless propeller fitting have been introduced.
E300: the requirement for alarm for thrust bearing temperature has been modified (lowered to 5 000 kW from 10 000 kW), as well as for oil lubricated fluid film bearings.
H200: requirements related to installation inspections for propellers have been modified, reflecting the above design requirement for shafting and shrink fitting.

Sec.2 Gear Transmissions

B200: the number for load cycles has been modified (down from 3 . 106 to 106) for gear calculations.

Sec.5 Torsionally Elastic Couplings

B200: the dimension criteria for calculating elastic coupling connections have been totally revised.

Pt.4 Ch.5 Rotating Machinery, Driven Units
Main changes coming into force July 2006:

Sec.1 Propellers

Table B1: the material constant for martensitic stainless steel has been modified.
Table E1: various modifications have been introduced, including deleting the requirement for monitoring high temperature of servo oil.

Sec.2 Water Jets

Table E1: various editorial modifications have been introduced.
Item G103, requirement for simulating load shedding through calculating torque variations, has been deleted.

Sec.3 Podded and Geared Thrusters

Sec.4 Compressors

Table A1: mostly editorial clarifications.
Item B403 has been added concerning containment for blade and or disc failure, respectively, at 110% of rated speed.
Table E1: various editorial modifications.
G: various modifications in torsional vibration determination have been introduced.

Pt.4 Ch.8 Electrical Installations

In Sec.1, Table B3 the documentation requirement for failure mode behaviour of automatic voltage regulator (AVR) has been deleted.
In Sec.2 A204 b), the requirement for maximum transient voltage under fault conditions has been deleted.
In Sec.5 B102, the requirement for testing of failure mode of AVR has been deleted. In Table C1, item 12 has been updated accordingly.

Pt.4 Ch.10 Fire Safety
Main changes coming into force January 2006:

General
The scope of work for the following cases has been clearly defined:

DNV being authorised by the flag state
DNV not being authorised by the flag state
Craft being built to national regulations.
The documentation requirements have been converted into a table, serving as guidance for the type of submitted documents, expected by class.
All IMO HSC Code text has been replaced by a general reference. IACS Interpretations, as well as DNV interpretations and clarifications have been included as new Appendices A and B.

Pt.5 Ch.14 Naval and Naval Support Vessels
Main changes coming into force January 2006:

Sec.1 E102 has been modified so that the class notations indicating naval distinction have been combined and named (navdist).
In Sec.11 I101, the class notation F-NAVAL has been re-named FIRENAV.

Main changes coming into force July 2006:

Sec.5 “Stability, Watertight and Weathertight Integrity” has been modified. The intention is to give the designer more flexibility as to the filling conditions of bilge, trim and ballast tanks in the intact stability calculations, thereby reducing the possibility of an excessively “stiff” ship design. However, more restrictive operational loading conditions may have to be observed as a consequence.
Also, an option has been included to use reduced wind drag for stealth type vessels.