scope:

This document contains provisions for geotechnical engineering design that are applicable to a broad range of offshore structures, rather than to a particular structure type. This document outlines methods developed for the design of shallow foundations with an embedded length (L) to diameter (D) ratio L/D < 0,5, intermediate foundations, which typically have 0,5 < L/D < 10 (Clause 7), and long and flexible pile foundations with L/D > 10 (Clauses 8 and 9).

This document also provides guidance on soil-structure interaction aspects for flowlines, risers and conductors (Clause 10) and anchors for floating facilities (Clause 11). This document contains brief guidance on site and soil characterization, and identification of hazards (Clause 6).

NOTE ISO 19901-8 and 19901-10 provide requirements and detailed guidance on these topics.

This document does not address aspects of soil mechanics and geotechnical engineering that apply equally to offshore and onshore structures.

Figure 1 set outs a high level typical workflow for design of offshore foundations with reference to other relevant ISO standards.

NOTE Specific design and installation constraints can apply for structures in arctic regions (see ISO 19906), for mobile offshore units, especially for jack-ups (see ISO 19905) and for anchors for floating units (see ISO 19901-7).