Part 5: Requirements of design verifiers

5.1 Requirements

Design verifiers are to:

1. carry out design verification on behalf of an inspection body
2. make recommendations to the inspection body relating to the issue or cancellation of certificates of design verification in accordance with regulations 30 and 31.

5.2 Design verification

Design verification is required for all cranes including second-hand cranes brought into New Zealand.

Two options are available for this process:

1. By design certificate
   
   Design verification by design certificate may be used for imported cranes from recognised manufacturers producing standard cranes, designed and built to an acceptable engineering standard.
   
   In all cases, where proven standard production model cranes are produced by manufacturers of established repute, subject to the following requirements, the crane can be accepted for design verification and fabrication inspection purposes on the basis of the manufacturer’s design statement.
   
   Where a crane is being constructed to a design that has been previously design verified, the existing design verification can be re-used provided no changes are made to the design or design standard affecting the structural strength or safety
   
   The documentation required for design verification includes:
   1. a statement signed by the chief design engineer, or other person authorised (in writing) by the manufacturer to sign such documents, stating the standard that the crane was designed and built to and that an independent design verification has been carried out. This shall be to a standard acceptable to the Department of Labour, e.g. BS, AS, EN, ANSI, DIN, ISO, JIS, NZS and any others that may be gazetted at a later date (refer to Appendix C).
   2. sufficient data, drawings, documents and other information to readily identify the crane and all of its major components and parts supplied by the manufacturer or replacement parts that are authorised and approved by the manufacturer. This should include:
      1. a general arrangement drawing that, if necessary, is supplemented by other drawings and shows the main boom and fly jib with chord and lacing members specified and shows also a typical mid-section of both
      2. a complete roping diagram showing all ropes.

   Manufacturers shall ensure that crane components and parts that are readily interchangeable, such as strut boom and fly jib sections, are permanently marked or can otherwise be readily identified by equipment inspectors.
   
   Test certification for all hooks, hook blocks and the standing and running ropes shall also be available.

2. By design analysis
   
   Design verification by design analysis is to be used for all cranes that are not proven standard production models.
   
   Sufficient documentation should be provided to the design verifier to enable a check to be carried out to establish that all structural, mechanical, hydraulic and electrical parts meet the specified code requirements with respect to stress, deflection, fatigue and seismic and wind loading. This documentation should be in the form of arrangement, schematic and detailed fabrication drawings. Calculations may be provided but are not necessary, as the verification is an independent check on the design.
   
   Drawings should specifically include:
   1. general arrangement giving all outline dimensions, crane capacity, classification, impact factors, wheel or foundation forces and design standard being used
   2. structural detail drawings showing sizes of all members, material specifications, welding and bolting details
   3. mechanical arrangement and detail drawings showing sizes of all components and material specifications
   4. electrical schematic drawings showing protection devices fitted
   5. hydraulic schematic drawings showing all safety valves and fittings.
   
   All drawings should have the designer’s name and contact details, be numbered for easy reference and be supplied in duplicate. The crane owner’s name and location should also be included.
   
   Where previously design verified standard components have been used in the design, details of the design verification should be provided.
   
   The inspection body will require test certificates for hooks and wire ropes before testing the crane.

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