ISO DIS 19905-1

Description / Abstract: This part of International Standard 19905 specifies requirements and guidance for the site-specific assessment of independent leg jack-up units for use in the petroleum and natural gas industries. It addresses:

a) manned non-evacuated, manned-evacuated and unmanned jack-ups;

b) the installed phase at a specific site.

To ensure acceptable reliability the provisions of this document form an integrated approach which shall be used in its entirety for the site-specific assessment of a jack-up.

ISO 19901-5 does not apply specifically to mobile offshore drilling units operating in regions subject to sea ice and icebergs. When assessing a jack-up operating in such areas, the assessor should supplement the provisions of this standard with the procedures relating to ice actions and ice management contained in ISO 19906.

This document does not address design, transportation to and from site or installation and removal from site. However it is recommended that the assumptions used in the assessment be checked against the as-installed configuration.

To ensure that the design of the jack-up is sound and the structure is adequately maintained, this Part 1 of ISO 19905 is applicable only to independent leg jack-ups that either:

—hold valid classification society certification from an IACS member body throughout the duration of the operation at the specific site subject to assessment or

—have been verified by an independent competent body to be structurally fit for purpose for elevated situations and are subject to periodic inspection, both to the standards of an IACS member body.

Jack-ups that do not comply with this requirement shall be assessed according to the provisions of ISO 19902, supplemented by methodologies from this document, where applicable.

NOTE 1 The IACS member, as referenced above, should meet the RCS definition given in 3.55.

NOTE 2 Future revisions of this document may 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 well conductors is not part of the site-specific assessment process for jack-ups and is therefore not addressed in this document. Annex A provides references to other publications addressing this topic.