UNE-EN ISO 19905-1:2023

The site-specific assessment (SSA) of a jack-up normally comprises the two parts, an elevated SSA(SSA-E), addressed in this part of ISO 19905, and an installation and removal SSA (SSA-I), addressed inISO 19905-4.This part of ISO 19905 specifies requirements and provides recommendation and guidance for theelevated site-specific assessment of independent leg jack-up units for use in the petroleum and naturalgas industries. It addresses:a) manned non-evacuated, manned evacuated and unmanned jack-ups;b) the installed (or elevated) phase at a specific site.To ensure acceptable reliability, the provisions of this part of ISO 19905 form an integrated approach,which is used in its entirety for the site-specific assessment of a jack-up.This part of ISO 19905 does not apply specifically to mobile offshore drilling units operating in regionssubject to sea ice and icebergs. When assessing a jack-up operating in regions subject to sea ice andicebergs, it is intended that the assessor supplement the provisions of this part of ISO 19905 with therelevant provisions relating to ice actions contained in ISO 19906 and procedures for ice managementcontained in ISO 35104.This part of ISO 19905 does not address design, transportation to and from site, or installation andremoval from site (which is addressed in ISO 19905-41). However, it is advisable that the assumptionsused in the assessment be checked against the as-installed configuration.This document is applicable only to independent leg mobile jack-up units that are structurally soundand adequately maintained, which is normally demonstrated through holding a valid recognizedclassification society (RCS) classification certificate.NOTE 1 An RCS is an International Association of Classification Societies (IACS) member body, meeting the RCSdefinition given in 3.52.Jack-ups that do not comply with this requirement are assessed according to the provisions ofISO 19902, supplemented by methodologies from this part of ISO 19905, where applicable.NOTE 2 Future revisions of this part of ISO 19905 can be expanded to cover mat-supported jack-ups.NOTE 3 Well conductors are a safety-critical element for jack-up operations. However, the integrity of wellconductors is not part of the site-specific assessment process for jack-ups and is, therefore, not addressed in thispart of ISO 19905. A.1 provides references to a publication addressing this topic.NOTE 4 RCS rules and the IMO MODU code (International Maritime Organisation Mobile Offshore Drilling Unitcode) provide guidance for the design of jack-ups.