The first edition of T&R Bulletin 5-5A, "Recommended Practice for Site Specific Assessment of Mobile Jack-Up Units" [ref. 1] was published by SNAME in May 1994 and was launched at a meeting during OTC that year. The document had been developed by representatives of all sectors of the industry during the previous six years, funded by a Joint Industry Project, and SNAME was approached to publish the document in order to widely disseminate it to industry. Offshore Committee 7 (OC7) was formed to both maintain the document, and to integrate new technology and revisions as they became available. The publication, however, was controversial as many felt the document was too conservative and had not been properly benchmarked, so around the same time, drilling contractors began working under the auspices of IADC to determine what could be done to improve both the usability and applicability of the document. The IADC Jack-Up Committee was born out of these efforts, and over the past 15 years, has funded many projects resulting in new knowledge, understanding and significant improvements in the calculation methodologies.
In 1996, ISO Work Group 7 (WG7), part of Sub Committee 7, was formed and mandated by the parent ISO Technical Committee for Offshore Structures, ISO/TC67, to develop the jackup site assessment standard using T&R 5-5A as the basis. A long period of development followed with new technology being funneled through the OC7 Revisions Sub-Committee to T&R 5-5A. Most of the new material went into the T&R Bulletin, and was later adopted into the developing ISO document, but as the ISO become more complete, material tended to bypass 5-5A. This did not negate the role of the Revisions Sub-Committee: one of the requirements for new material for inclusion in 5-5A was that it be presented in "Document Ready" wording. While new material still may have needed some editing to get into ISO-Speak, the "Document Ready" requirement saved substantial time. In addition, during the development of the ISO document, the only formally published document was T&R 5-5A, during which time OC7 played a vital role in keeping the site assessment document current.
This paper sets out the role played by SNAME OC7 in the development of the ISO 19905-1 and 19905-2 [ref. 2 & 3], and shows the value of having SNAME, an internationally recognized body, maintain the document while the ISO was being developed. The paper also discusses the role of industry in the future maintenance of the documents, and the necessity of encouraging new participants into the relevant committees.