ObjectiveThe objectives of the integrity assessment will be performed as follows:- To establish the current stress levels using the latest standards, loading and current in-place conditions. To perform pushover analyses on the structures to establish reserve strength ratio of intact and damaged structures. To perform fatigue analysis. To establish modifications to loading or structural strengthening if necessary to extend the operating lives by 20 years above the original design life using fatigue life predictions. To establish the mitigation plan and design for required life extension for next 20 years.Platform DetailsAll the platforms are of the following type

3-Legged PlatformsDepth El=-18.9mTOS El=10.513

SCOPE OF SERVICE

GENERALThe scope of Service will cover the following activities:

Data collation and review. Review of the available previous design calculations and inspection reports. Sites visit to the platforms and structures and verify as-built drawings (if required). Review existing weight control reports if available in the Company records and prepare a weight control report for each platform with an associated spreadsheet. Review the available site specific soil reports and derive the necessary parameters including P-Y and T-Z data for the Platforms. Review and gather available SACS model of the platforms. Structural modeling of the platforms, boat fenders appurtenances and soils using SACS Software. Update the model with all data for geometry, equipment and other operating loads, environmental loads, soil data etc. Perform In-place operating and extreme load structural analysis of all structures according to the latest edition of API RP2A-WSD. Establish the current stress levels using the latest standards, loading and current in--place condition. Perform a spectral fatigue analysis for all the Platforms. Establish the remnant fatigue lives at the critical locations and if necessary, make modification proposals to extend the fatigue lives to at least 20 years beyond the original design life, including a factor of safety of 2. Carry out pushover analyses to establish the value of reserve strength ratio for the intact structure and the structure with damaged members. Prepare a well-defined risk based inspection plan following the results of fatigue and pushover redundancy analyses and optimize the risk based inspection requirements, concentrating on critical locations as found necessary and recommend inspection intervals. Preparation of Structural strengthening drawings if required after performing Global analysis. Make provision to provide a modification package including scope of work (if necessary and economically viable) for modifications to structures to achieve a minimum 20 years of further design life including a factor of safety of 2

WORK EXECUTION

Collation and Utilization of information/Data

i. The Contractor must compile, review and utilize all the available information, data, documents, reports, drawings etc. This shall include all additions I modifications till now on structure(s), additions I deletions to utility (major equipment, services etc.) for weight assessment.ii. Carry out site visits to the areas as necessary for visual inspection, structural survey and data gathering. Required thickness measurements for verification of As Built conditions also form part of survey scope.iii. It is not envisaged that the inspection would include diving works. Diving inspection reports will be made available by the Company.iv. Collect any other relevant and available information required for the analysis and study including information obtained from inspection reports and previous issued along with report. The weight report shall clearly document the basis for the weight and compare with the previous structural analysis weights where available.

Review of the Draft Design Criteria

Following the collation of all the necessary information and data, the Contractor shall review and assess draft design criteria currently used by the Company for design of its offshore structures with respect to the latest editions of the appropriate British and American Codes of Practice, appropriate alternative standards such as DNV Rules etc.The Contractor shall make recommendations for any changes and improvements to be made to the design criteria and agree the same with the Company. This shall then be used in the study and analysis of the structures.

Basis of Design Report

Following compiling and review of the criteria, data and documents as stated above, the Contractor shall prepare and submit a basis of Design Report for review and approval of the Company.

Structural Analysis of Platforms -a) The subject platforms are originally conceived to be more or less similar configuration and therefore one common computer mathematical model with separate treatments for variations in the four structure decks can be developed with separate in-place, fatigue and pushover analyses for each platform, as per their correct loading condition.b) The Contractor shall perform complete structural analysis of the platforms together with the associated appurtenances and attachments. The analysis shall be carried out using SACS computer software for modeling and analysis of the structures in order to determine the overall behavior of the structures and to establish the maximum stress levels in all the structural components.c) All attachments and appurtenances including boat landings, caissons, stair cases and overhangs etc. which contribute in increase of wave and wind loading shall be modeled and accounted for when analysis is performed. Boat landing structure if connected with the main platform shall be modeled as real and integral with main platform structures.d) The fundamental natural frequency of the structures shall be calculated to be used in fatigue and in-place analyses. The structures shall be analyzed using the gathered data, updated environmental and geotechnical data, design criteria and the requirements of the latest editions of the relevant and approved international codes of practice and shall be checked against these codes and standards listed in the approved basis of design report.e) The structures shall be analyzed under operating one year and for the extreme 100 years design storm wave. Code checking of the structural elements of the platforms should be performed and comply with the appropriate international standards and codes of practices.f) The analysis shall consider waves from eight directions with their associated period range and minimum and maximum water depths in order to establish the worst scenario, which will result and produce the maximum stresses in the structural elements.g) Fatigue analyses of the platforms are required using spectral fatigue and applying the available data provided by the Company. Any member or joints, if above water level, appears to be prone to fatigue, damage shall be reported and recommendations for various options for remedial action i.e. joint strengthening or modification shall be submitted.h) The final stage of this exercise is to carry out pushover analyses for all the structures in order to develop a risk based inspection plan. An in-elastic pushover analysis is required to establish the reserve strength of the intact structures as defined in API RP2A 2151 edition. Further pushover analyses shall be applied to establish the reserve strength of the structures assuming some critical elements are defective/damaged and. Unable to carry any loads. In case where a leg is damaged, shall also be considered in establishing the redundancy of the structures.i) Contractor shall review the results of the in-place and fatigue analyses and using this information, propose the most likely situation on which to perform the pushover analyses for the damaged structure.j) The recommendations for performing this analysis are laid out in API RP2A.21 st Edition. Particular attention is drawn to the need for careful modeling of members to ensure correct response to the applied loading.k) Where analysis and calculations carried out illustrate that the life extension for the platforms cannot be expected, recommendations and options for strengthening supported by re-analysis and cost estimates for strengthening should be provided by the Contractorl) In the study of the various options/recommendations, the Contractor is expected to narrow down on at least two (2) options for strengthening with due consideration on the most cost- effective measures to be adopted.

. DELIVERABLES

a) Contractor shall submit one (1) hard copy each of the following preliminary draft reports for review and approval by the Company:The following reports shall be submitted for Company's approval for each well head platforms.

1. Site Survey report2. Basis of Design Report3. Global In-place analysis report;4. Spectral Fatigue analysis report;5. Weight Control report;6. Nonlinear Pushover analysis;7. Boat impact analysis report;8. Structural Integrity Assessment Report with recommendations;9. RBI Inspection Plan;10. Structural strengthening/modifications required with recommendation, modifications/strengthening drawings and cost estimate.11. Soft copy of the SACS files.

b)Final report shall be issued in two (2) copies (hard and soft) upon Company's review and acceptance of the draft report. The summary and recommendation of the FFS assessment shall be submitted in PowerPoint slide format.