engleski

INTERPRETATION OF RESULTS OF EVALUATION AND SELECTION OF STRUCTURAL ELEMENTS FOR SURVEY: «JACKET & DECK», «IVANA A REVAMPING» PLATFORM

Periodical controlling of the actual state of existing structure after revamping is a characteristic feature in structural check and health monitoring after initial loading or setting into the operation. Supervising and health monitoring of any kind of structure is a new field that has been opened to be of increasing importance with regard to control durability, stability and safety as well as to estimate the life span of structure. Different techniques are used to record the actual situation in order to get reliable information about on the on-site structure and structural elements. A minimum strength capacity of is considered appropriate for contemporary offshore platforms in order to provide a safety from any expected or unanticipated loads. Such provision also ensures a minimum standard for connections of particular members that take on primary importance in reserve strength assessments of the whole structure. During changes of the structural elements, recording the actual situation is directed towards reliable information about on the on-site structure and particular structural element. Such a change has occurred by revamping the IVANA A platform and upgrading of certain structural elements. According to the task defied for the offshore platforms IVANA A REVAMPING (platform IVANA A after revamping), there was a request for selection of structural elements jacket & deck where it is necessary to perform monitoring and survey according to ISO standards ISO/CD 19902 and recommendations of American Petroleum Institute described in «API RECOMMENDED PRACTICE 2A-WSD (RP 2A-WSD)», 21st ed., Dec. 2000. We have used the experience of Minerals Management Service (MMS), a bureau of U.S. Department of Interior, which ensures the safety and integrity of the oil and gas platforms. The elaboration of the Faculty of Mechanical Engineering and Naval Architecture (FSB) INTERPRETATION OF RESULTS OF EVALUATION AND SELECTION OF STRUCTURAL ELEMENTS FOR SURVEY OF «IVANA A» PLATFORM from May 2004 for the platform IVANA A before revamping describes the selection of required elements. As the basic design project documentation for the platform IVANA A «JACKET & DECK STATIC IN SERVICE ANALYSIS» has been used. Structural revamping and supplemental equipment to the IVANA A platform includes the new slug catcher, liquid receiver, the new piping and the steel structure for escape route. In accordance with these upgrades, new structural calculations of the platform IVANA A REVAMPING were implemented and issued an expert opinion on the stability of the platform. As the base for this elaboration, the above-mentioned FSB elaboration and project document IVANA-A PLATFORM REVAMPING «DECK - STATIC IN SERVICE ANALYSIS» were used. In this elaboration was performed the selection of structural elements according to the criteria of design level analysis as concluded at the meeting in Croatian Registry of Shipping (CRS) held on May 28, 2004 in Split. Elements of platforms that need to be surveyed are sorted in tables in the groups of higher risk with the properties of particular elements and joint global coordinates. Volume of elaboration is 28 pages, contents of five sections, 20 figures and one table, and referring to 23 papers and documents. Postulates that need to be emphasized are underlined due to better orientation in text.

offshore gas platform; survey; risk assessment; structural elements

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