DNV DNV-RU-SHIPS/HSLC PART 4 CHAPTER 2 PDF

Purpose and scope

These rules apply to ships, high speed, light craft and naval surface craft. The requirements are also applicable for relevant class notations.

Guidance note:

For newbuildings intended for the class notation , additional requirements for instrumentation are given in the Rules for Classification of Ships Pt.7 Ch.8. The class notation can only be obtained when the vessel is in operation. When the additional requirements are met, the vessel is prepared for the class notation.

The classification activities include certification of products as well as assessment of the arrangement and dynamics in a machinery plant built up of various products.

Certification normally includes design approval, inspection and testing of components and workshop testing of the assembled product. A product certificate is issued when the certification requirements are fulfilled. However, no unit is finally accepted before the shipboard testing is successfully completed.

Classification activities also include approval of machinery arrangement such as foundation, alignment, etc. and all relevant dynamics such as torsional vibration, engine vibration, etc. Survey of installation and shipboard testing also forms part of classification.

Guidance note:

Special attention should be paid to vibration levels of machinery components for ships that are to be assigned . Upon commissioning of the machinery systems, it is recommended that vibration measurements are carried out. Acceptable vibration levels should be verified.