Pt.4 Ch.2 Rotating Machinery, General
Main changes coming into force 1 July 2007
Sec.4 Electric Power Generation
Sec.4 has been amended to align with IACS UR M3 for emergency generator sets.
Pt.4 Ch.3 Rotating Machinery, Drivers
Main changes coming into force 1 July 2007
Sec.1 Diesel Engines
In item A501, foundations of diesel engines are now considered as the engine manufacturers design responsibility.
In item A601, the scope of torsional vibration calculations for diesel driven installations has been clarified.
In item I301, the scope for sea trial of diesel propulsion engines driving fixed pitch propellers has been amended to be in line with IACS UR M51.
Item I302 concerning the requirement for vibration measurement of turbochargers during sea trial has been deleted.
In Table E3 row no. 9, covering crankcase explosive condition, has been modified to be in line with IACS UR M63.
Pt.4 Ch.4 Rotating Machinery, Power Transmission
Significant editorial changes
Sec.1 Shafting
In Table B1 the safety factor for low cycle criteria has been changed. The new safety factor will be 1.25 for both peak stresses and reversed stresses in notches. The justification for a lower safety factor was that the low cycle fatigue criterion was too strict; in that the scatter in material properties for low cycle fatigue is essentially smaller than for high cycle fatigue. The consequence of this change is slightly reduced shaft diameters in plants with low torsional vibration levels.
Concerning item B206. The factor in the formula for low cycle criterion has been changed from 29 to 28. This is consistent with the new reduced safety factor shown in Table B1. In Table B2 the k1-factor for longitudinal slot in oil distribution shafts has been changed in order to match the corrected formula for stress concentration factor (based on an extensive FE parameter study).
Concerning item B207. The factor in the formula for low cycle criterion has been changed from 29 to 28. This is consistent with the new reduced safety factor shown in Table B1. In Table B4 factors k1 for low cycle criteria have been changed based on updated knowledge on stainless martensitic or duplex steels.
Concerning item B402. In the full speed range TC1 has been changed from "torque" to "required torque", in order to make the text more clear (i.e. the use of partial safety factors directly on the load). The Formula for thrust capacity has been removed and a new formula for axial force, FA, has been added. The reason being that the previous partial safety factor on thrust actually slightly reduced the requirement for friction torque. The formula for friction force, FFR, has been corrected (previous misprint) and the formula for surface pressure, p, has been modified in order to take into account the corrected axial force. The formula for pull-up distance has also been corrected from a previous misprint.
Concerning item B403. In the full speed range TC1 has been changed from "torque" to "required torque", in order to make the text more clear (i.e. the use of partial safety factors directly on the load). The formula for thrust capacity has been removed and a new formula for axial force, FA, has been added. The reason being that the previous partial safety factor on thrust actually slightly reduced the requirement for friction torque. The formula for friction force, FFR, has been changed and the formula for surface pressure, p, has been modified in order to take into account the corrected axial force. The formula for maximum permissible surface pressure, pmax, has been corrected from a previous misprint. The consequence on required pull up length is minor, a small increase for pushing propellers and a small decrease for pulling propellers. No consequence for direct coupled 2-stroke plants.
Concerning item B501. A new requirement (secure against axial movement) for tapered connections steeper than 1:30 and keyed connections with axial forces, has been added.
Concerning item C103. This rule requirement has been removed, as it gives little added value to bearings and seals.
Pt.4 Ch.5 Rotating Machinery, Driven Units
Main changes coming into force 1 July 2007
Sec.1 Propellers
Sub-section element A200: Documentation requirements have been clarified - design parameters that should be specified have been itemized. An assembly drawing for built-up propellers has been included in the table of documentation requirements.
Sub-section element B100: A correction in guidance note for fatigue testing of propeller materials has been performed.
Sub-section element B200: The background for the chosen safety factors has been described.
Sub-section element B300: The part related to design requirements for hub and pitch mechanism has been significantly clarified, explaining the principles in more detail. Minimum safety factors for static and fatigue calculations have been given, and their background has been described. Reference has also been given to CN 41.5, where even more details are to be found. A paragraph ensuring a minimum hub thickness for “thin-hub” shrink fitted propellers has also been included.
Sub-section element C100: Inspection requirements for propeller blades have been specified in more detail.
Sub-section element H200: Verification of proper securing of bolts for fitting of propeller and propeller blade has been addressed.
Sec.3 Podded and Geared Thrusters
The limit for not requiring torsional vibration calculations for auxiliary thrusters has been set to 500 kW, as for other auxiliary installations (Table A1).
Requirement for vibration measurement of turbochargers during sea trial has been deleted.
Design criteria for azimuth speeds of propulsion thrusters have been amended.
Harmonised power limit has been introduced for when torsional vibration calculations are unnecessary for auxiliaries.
In Table E1, several corrections mainly covering the use of footnotes have been made.
Significant editorial changes
Sec.1 Propellers
The Guidance note in item C301 has been deleted and a new item C302 has been added.
Sec.2 Water Jets
Item A202, covering requirements for torsional shock vibration calculations, has been removed.
The Guidance note in item C201 has been deleted and a new item C203 has been added.
Item I105 has been modified for clarification.
Pt.4 Ch.7 Boilers, Pressure Vessels, Thermal-Oil Installations and Incinerators
Main changes coming into force 1 January 2007
Sec.8 Manufacture, Workmanship and Testing
In Sec.8 item D106, a new paragraph, covering ultrasonic testing in lieu of radiographic testing, has been added.
Pt.4 Ch.8 Electrical Installations
Significant editorial changes
Sec.1 Service Description
A103 b): Date of request for valid standard has been changed from class request to date of contract between owner and yard.
A103 c): Deleted.
Table B1: Clarification of documentation requirements for EX installations. Additional information element: Capacity of battery and charger for battery systems.
B303 and Table B9 note 1: DNV Product certificate or DNV Type Approval certificate required according to Table B9, work certificate required when necessary for further information.
B304 GN deleted.B403 b) deleted.B404: Added "cable routing arrangement" to list of available documentation.
Table B8: Clarification of documentation requirements for system for automatic start/stop of generators and automatic operation of breakers.
Table B9: The certification limit for semi-conductor assemblies for power supplies has been changed from 100 kVA to 50 kVA.
Sec.2 System Design
A102 b): Text concerning equipment location has been deleted.
A103 f): Clarification of requirements for TN-C-S system has been added.
A106 Text concerning systems on tankers has been deleted.
A204: Voltage tolerance for battery systems has been changed in line with IACS UR E5.
B104 a) and c): Clarification of requirements for automation system.
B105 Text concerning stand-by start has been added.
E102 b): The requirement for staring of the engine for the emergency fire pump has been deleted.
F103: References have been updated.
F202, 203 and 204: COLREG, as a common term, has been added to navigation lights. F204 c) updated to be in line with IACS UI COLREG2.
F301 f) Text concerning high voltage shore connection has been deleted.
F401 a) The scope of supply to navigation equipment has been changed in line with 1A1/SOLAS/IACS requirements.
G103: f) has been moved to G600.
G201: f) has been moved to G202 and h) has been moved to H101.
G401 c): has been deleted.
G501 d): Rule references have been updated.
New H200: G201 h) moved to H200 concerning requirements about general control.
H303 b) (previous H203): Text concerning the acceptance of one independent synchronising device for each generator has been added for clarification.
H500 (previous H400): Equipment requiring emergency stop has been updated in line with SOLAS. Requirement for separation of control cables and control circuits for duplicated equipment has been added.
I206 This item, concerning hazardous areas, has been deleted.
I301 c): Text concerning fittings for installation above generators, has been amended.
I400 Table I1: The table has been divided in two tables: one for vented types and one for dry types. The limit for battery size located in electrical assemblies has been increased to 5kVAh. When the assembly is mechanically ventilated the upper limit for installation in the battery room has been increased to 100 kVAh.
I403 b) Text concerning the acceptance of less distance above each cell, provided disconnection and maintenance can be carried out safely, and that cooling of the batteries has been taken into account, has been added.
I403 d) is made applicable for GMDSS batteries not installed in accordance with b.
I403 e) has been deleted as it is covered by new tables.
I500: Deleted I501 d), based on feedback from surveyors, and as this requirement is DNV speciality. Redundancy requirements for generator, steering gear and transformer cables are covered by 502 and 503.
J201: Text concerning PVC 60°C temperature class has been deleted as PVC insulation temperature class has been changed to 70°C in line with IEC 60092-350.
J701: Added new c): Concerning the neutral conductor that shall normally be a part of the power supply cable. Separate neutral cable may be accepted if the power cable not is provided with magnetic braiding.
J802: Rating of cables with temperature class 70°C has been added.
Sec.3 Equipment in General
C102: Text concerning battery systems has been updated in line with IACS UR E5.
Sec.4 Switchgear and Controlgear Assemblies
A101 a): Reference to IEC 60466 has been deleted.
A105 b) Text concerning arrangements without flame retardant partitions has been added.
A107 b) has been rewritten. Old item a), b) and c) are covered by the new b), c) and d). Old d) has been deleted as this requirement is covered by Sec.3 E104 a). Sub-item e) is a new requirement for indication of correct setpoint of protection. This requirement is based on SOLAS Reg. II-1/45.6.2).
A108: IEC 60947-4-1 Part 4 has been deleted and replaced with IEC 60437-1 Table 14 and 16, pollution degree 3, inhomogeneous field.
B106 b): Text concerning the arrangement of switches rated more than 63A shall be accessible on the switchboard front, has been deleted.
B108 moved to new B200 (previous B300).
B109 (new B108) Text has been rewritten and the Guidance note incorporated in the new text.
B200 has been deleted as covered by Sec.2 I400.
C101 and C105: References have been updated.
D106: New c) has been added concerning impulse voltage test in accordance with IEC 60439-1 section 8.3.2. d) and e) have been moved to guidance note.
Sec.5 Rotating Machines
Sec.5 has been updated in line with IEC 60034.
A203: The text has been amended concerning increased temperature rise, where water cooled heat exchangers are used. Corrected from 8°C to 13°C.
Table A1: Temperature rise for insulation class F has been updated in line with IEC 60034-1.
References have been updated in item A204 b), Table C1 and associated guidance notes.
Sec.6 Power Transformers
A101: IEC reference has been amended to IEC 60076.
A201: Text concerning the acceptance of autotransformers used for feeding/supplying single consumers has been added in line with today's practices.
B100: Text concerning the requirements for testing of dry transformers in line with IEC 60076-11 as follows:
Short circuit test is according to IEC considered as a special test.
Inducted AC withstand voltage test (IEC 60076-11 20) has been added.
Partial discharge measurement≥ 3.6 kV (IEC 60076-11 22) has been added.
Sec.7 Semi-conductor Converters
Sec.7 has been rearranged and rewritten. The new requirement is in line with the IEC 61800 series for semi-conductor converters for motor drives and IEC 62040 series for semi-conductor converters for power supply.
Sec.8 Miscellaneous Equipment
A101 e). Text has been added concerning exceptions from earthing of socket outlets made valid for IT system only.
Sec.9 Cables
Table B1: Temperature class for PVC has been changed to 70 °C (IEC 60092-351).
The following Note has been added: "Silicon rubber only to be used together with a varnished glass braid due to pure mechanical properties". (IEC 60092-376).
H101: References updated according to IEC 60092-350.
Sec.10 Installation
C503 c): Requirement for 4 mm thickness has been deleted.
C505: Requirement for fixing distance of electrical cables in accordance with IEC 60322-3 has been deleted as covered by Table C3.
C703: Wall thickness of cable pipes has been replaced with a reference to Pt.4 Ch.6 Sec.6 Table A1, A2 and A2.
C904 Guidance note: Added "(metal to metal without paint or coating)".
D409: New item concerning test requirement of semi-conductor converters after installation.
Sec.11 Hazardous Area Installations
C101 d) Added reference to IEC 60092-502, with regards to temperature class and gas group.
C205: Updated with requirements from Sec.2 I400. Collection of requirement for hazardous area with regard to batteries.
General
The material factor f1 for NV-40 steel has been changed from 1.43 to 1.47 throughout the chapter to align with IACS common structural rules for tankers and bulk carriers.