scope:

This document gives requirements for the design, fabrication, inspection, modifications and structural integrity maintenance of the topsides structure for an oil and gas production platform. It complements ISO 19902, ISO 19903, ISO 19904, ISO 19905 and ISO 19906, which give requirements for various forms of supporting substructure. Requirements in this document concerning modification sand maintenance relate only to those aspects that are of direct relevance to the structural integrity of the topsides structure.
The actions on (structural components of) the topsides structure are derived from this document, where necessary in combination with other International Standards in the ISO 19901 series. The resistances of structural components of the topsides structure may be determined by the use of international or national building codes, as specified in this document. If any part of the topsides structure of a fixed structure (steel or concrete) forms a primary forms a primary structural component of the overall structural system of the whole platform, the requirements of this document shall be supplemented with applicable requirements of ISO 19902, ISO 19903 or ISO 19906.
This document is not applicable to those parts of the superstructure of floating structures that form part of the overall structural system of the floating structure; these parts come under the provisions of ISO 19904.
This document only applies to the structure of modules on a floating structure that do not contribute to the overall integrity of the floating structural system.
This document is not applicable to the structure of hulls of jackups or of other mobile installations.
This document is applicable to the topsides of offshore structures for the petroleum and natural gas industries as follows;
. the topsides of fixed offshore structures;
. discrete structural units placed on the hull structures of floating offshore structures and mobile offshore units;
. certain aspects of the topsides of arctic structures.
Parts of this document are also applicable to those parts of the hulls of floating offshore structures and mobile offshore units that contain hydrocarbon processing, piping or storage.
This document contains requirements for, and guidance and information on:
. design, fabrication, installation and modifications ;
. in-service inspection and structural integrity management;
. assessment of existing structures ;
. re-use of structures;
. prevention, control and assessment of fire, explosions and other accidental events applicable to offshore structures.
The document applies to structural components including the following:
. primary and secondary structure in decks, module support frames and modules;
. flare structures;
. crane pedestal and other crane support arrangements;
. helicopter landing decks (helidecks);
. permanent bridges between separate offshore structures.
This document does not apply to those parts of floating offshore structures and mobile offshore units that are governed by the rules of a recognized certifying authority and which are wholly within the class rules.