DNV is pleased to launch its new Standard for Certification No. 2.22 - Lifting Appliances. The new standard replaces Rules for Certification of Lifting Appliances, 1994, that is phased out these days.
The new standard is valid from the 15th of November 2008.
The practical arrangement for the transition period between the previous and the new rule regime will be as follows:
- For cranes covered by class notation CRANE and Crane Vessel the contract date between yard and owner will apply.
- For other cranes the contract date between the crane manufacturer and the purchaser applies.
- For existing cranes the Rules for Certification of Lifting Appliances – 1994 will still be valid.
Some of the most significant changes between the new Standard and the previous Rules are listed below:
Documentation and information to be submitted for approval are more detailed and descriptive in the new Standard.
The material requirements in the new Standard are, to a large degree, harmonised with DNV’s Rules for Ships.
Major changes and new features concerning structural strength:
- The design dynamic factor for hose handling cranes is increased from 1.15 to 1.3.
- Additional strength will be required for the pedestal for offshore sub sea handling cranes as well. (Same requirements as for supply boat operations.)
- The equation for minimum flange thickness (for slewing ring/pedestal flanges) is changed.
- The equation for calculation of hoop stress for Lebus grooved drums is modified.
The brake requirements for winches are changed.
- Significant changes and new features concerning crane systems:
- Scheme for certification of control- and electrical systems are harmonised with requirements laid out in DNV Rules for Ships, part 4, chapter 8 and 9.
- The requirements to safety and control systems for offshore cranes are more detailed and a new method of verification, by means of verification sheets, has been introduced.
- Guidance for wireless control is introduced.
The requirements to lifting of persons are more extensive and detailed.
Additional appendices deal with:
i) Marking of single sheave blocks,
ii) Calculation of forces and acceptable stress in transit condition,
iii) Documentation requirements for acceptance of works certificates for winches, gears and hydraulic cylinders,
iv) Verification guideline for offshore crane safety functions, including verification sheets.
Please contact your nearest DNV station for more information.