Oil and gas industries including lower carbon energy - Specific requirements for offshore structures - Part 4: Geotechnical design considerations (ISO/FDIS 19901-4:2024); English version FprEN ISO 19901-4:2024
Abstract
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 may be applied for foundation design for offshore structures used in the lower carbon energy industry. For example, this document may be applied for the design of foundations used in the offshore wind industry. In this case, it shall be verified that the type and dimension of the foundation, as well as the type of actions acting upon it, are consistent with those used in the development of the design methods. For example, the pile design methods of Clause 8 are not necessarily applicable to the design of monopiles for which L/D is less than 10 and their validity for such cases shall be assessed. Offshore wind structures can also have other requirements, such as a characterisation of foundation stiffness, that are beyond the scope of this document. Reference should be made to the overarching application specific codes and standards such as IEC 61400-3-1. This document shall not be applied to onshore structures where it is expected that other codes and standards provide more specific requirements or practice. ISO 19905 provides requirements and detailed guidance on foundations for mobile offshore units. Figure 1 sets out a typical workflow for design of offshore foundations with reference to other relevant International Standards.
Begin
2021-12-22
WI
00012426
Planned document number
DIN EN ISO 19901-4
Project number
10900473
Responsible national committee
NA 109-00-01-07 AK - Offshore structures - Mirror committee of ISO/TC 67/SC 7
Responsible european committee
CEN/TC 12 - Oil and gas industries including lower carbon energy.
Responsible international committee
ISO/TC 67/SC 7/WG 10 - Foundations
draft standard
Petroleum and natural gas industries - Specific requirements for offshore structures - Part 4: Geotechnical design considerations (ISO/DIS 19901-4:2022); English version prEN ISO 19901-4:2022
2022-06
Order from DIN Media
