2 Throughout the development of the Code it was
recognized that it must be based upon sound design and engineering
principles and experience gained from operating such units; furthermore,
that design technology of mobile offshore drilling units is not only
a complex technology but is rapidly evolving and that the Code should
not remain static but be re-evaluated and revised as necessary. To
this end the Organization will periodically review the Code, taking
into account both experience and future development.
3 Any existing unit which complies with the provisions
of the Code should be considered eligible for issuance of a certificate
in accordance with this Code.
4 The Code is not intended to prohibit the use
of an existing unit simply because its design, construction and equipment
do not conform to the requirements of this Code. Many existing mobile
offshore drilling units have operated successfully and safely for
extended periods of time and their operating history should be considered
in evaluating their suitability to conduct international operations.
5 The coastal State may permit any unit designed
to a lesser standard than that of the Code to engage in operations
having taken account of the local environmental conditions. Any such
unit should, however, comply with safety requirements which in the
opinion of the coastal State are adequate for the intended operation
and ensure the overall safety of the unit and the personnel on board.
6 The Code does not include requirements for the
drilling of or the procedures for control of the subsea well. The
drilling operations are subject to control by the coastal State.