If these vessels conform to the definition 'compressed gas container' in the Hazardous Substances (Compressed Gases) Regulations 2004 then these regulations are the applicable legislation and vessels must be certified by test certifiers. Test certifiers and detailed information on the regulations and NZ certification requirements can be found on the following website:

http://www.ermanz.govt.nz/hs/index.asp

If these vessels fall outside the scope of the above regulations but conform to the definition of a pressure vessel in the Health and Safety in Employment (Pressure Equipment, Cranes, and Passenger Ropeways) Regulations 1999 then they must be certified by an inspection body recognised under these latter regulations.

According to Schedule 1 of the PECPR Regulations a crane includes all parts down to and including the hook or other load-handling device, but it does not include lifting gear that is not an integral part of the crane.
If a lifting beam is attached to the crane in place of the hook it requires design verification and inspection as an integral part of the crane.
If a lifting beam is suspended from the hook it does not require design verification or inspection under the PECPR Regulations. In such a case, the Approved Code of Practice for Load-Lifting Rigging (clause 5.6), requires the beam to be designed, manufactured and tested as per NZS 3404Steel structures Standard or equivalent. This should be assessed by a Chartered Professional Engineer.

Yes. An inspection body can send personnel to another country, or engage suitable persons in another country, to perform work under its PECPR Regulations recognition. The person or persons so employed or engaged must work fully under the body's accreditation, following the approved procedures of the recognised body, and all documents must clearly relate to the inspection body.

If an inspection body opens a satellite office in another country intending that it issue its own documentation and operate autonomously or semi-autonomously, the satellite office must independently seek recognition as if it were a separate organisation with its headquarters in that country.

The following three classes of equipment are not subject, either fully or partly as the case may be, to the regulations:

a) Equipment which does not come within the scope of the term 'equipment' as specified in regulation 4 (fully not subject); and

b) Equipment excluded from the regulations by schedule 2 of the regulations (fully not subject); and

c) Equipment which has been specially exempted from the regulations by the Secretary (fully or partially not subject, and possibly subject to conditions). Either consult Engineering Safety to determine if particular equipment may be affected by such an exemption, or look under Gazetted Exemptions (under the Documentation button on the left).

Also controllers, designers, manufacturers, or suppliers of certain kinds of equipment may be specially exempted by the Secretary from a duty imposed by the regulations (possibly subject to conditions). The situation with respect to any controller, designer, manufacturer, or supplier can be ascertained by consulting Engineering Safety.