The HI Development Project is to develop 6 gas wells coming from 2 reservoirs (U8 & V2) via jack-up drilling concept. The base case consists of a main Processing Platform bridge-linked to the Wellhead Platform. Integrated accommodation and processing concept will be the basis of this project.
On PP, the gas will be compressed and exported via a new gas pipeline from the Processing Platform to the existing Offshore Gas Gathering System (OGGS) pipeline which is 27km away. The gas and the condensate are separated to be dried, then dry condensate is spiked into the dry gas pipeline. Produced water from the gas / condensate processing will be disposed overboard, after being de-oiled to a level below 25mg/l.
Fire Risk Analysis (FRA)
Main objectives of the Fire Risk Analysis (FRA) are to:
⦁ Identify a range of credible fire scenarios resulting from process and non‐process failure cases.
⦁ Model/Quantify the scenarios identified (flame length and height, pool diameter, heat radiation distances, probability of occurrence).
⦁ Evaluate the consequences on the significant targets potentially vulnerable to fire exposure.
⦁ Identify the escalation potential for each fire event and possible damage to asset.
⦁ Provide design transient thermal radiation flux on identified vulnerable targets for the design of Passive Fire Protection.
⦁ Identify possible requirement for additional risk reduction measures to manage the fire hazards.
Explosion Risk Analysis (ERA)
Main objectives of the Explosion Risk Analysis (ERA) are to:
⦁ Determine explosion overpressures on the Well Head Platform and PP due to gas clouds.
⦁ Provide an input into the EERA (Escape, Evaluation and Rescue Analysis), the ESSA (Escape, Evaluation and Rescue Analysis) and the QRA (Quantitative Risk Analysis) studies.
⦁ Provide an input for the design of structural and critical equipment and piping.
Escape, Evaluation and Rescue Analysis (EERA)
The study is carried out to ensure that:
⦁ The required adequate escape, evacuation and rescue facilities are made available over the whole HI Complex.
⦁ They comply with the performance of the overall EER strategy.
⦁ Correctives actions from the analysis are incorporated in the design of the facilities.
Dropped Object Study
The objective of this study is to determine the reasonable protections required for HI Project subsea
and topsides facilities against potential dropped object during the production phase.
Ship Collision Study
A ship collision study is performed to examine the ship collision risk for the HI Project from the vessels The objectives of the study are:
⦁ To identify and analyze potential collision, caused by passing shipping, supply vessels, crew boats, fishing boats.
⦁ To assess collision probabilities and their potential consequences.
⦁ To identify potential control/mitigation measures.
Quantitative Risk Analysis
A QRA study is performed following recognized international standards.
The objectives are:
⦁ To confirm that aggregate risk level to individuals and groups is tolerable.
⦁ To identify and define further risk reduction measures that would reduce this risk level associated with HI Project to ALARP.
Emergency System Survivability Analysis
The Emergency System Survivability Analysis aims to demonstrate the ability of the emergency systems:
⦁ To withstand severe accident conditions.
⦁ To survive the consequences of Major Accident Events (MAE) sufficiently to continue to perform their safety critical function for the duration of the emergency.
⦁ To provide input to “performance standards for safety critical elements’’.
Performance Standards for Safety Critical Elements
The performance standards objective is to demonstrate that the safety critical elements are suitable for fulfilment of the scope and functions they are provided for.
The performance standards will:
⦁ Be suitably described, normally in quantified terms, to be verifiable.
⦁ Reflect any relevant lifecycle requirements of the critical element.
⦁ Reflect the interaction or dependence between safety critical elements for a particular major accident scenario.
ALARP (As Low As Reasonably Practicable) Demonstration
The ALARP demonstration consists in analyzing each MAE to:
⦁ Ensure that the design of the installation incorporates all reasonably practicable measures, which aims to ensure that the risks posed by operation of the facilities will be ALARP.
⦁ Show through reasoned and supported arguments that there are no further practicable options that could reasonably be adopted to reduce risks further.
SSIV (Sub – Sea Isolation Valve) Requirement Study
A SSIV assessment is carried out to determine the need for an actuated subsea isolation valve (SSIV) on exporting pipeline.
It includes:
⦁ Consequence analysis to model all types of fires and to determine potential impact on the topside facilities,
⦁ A SSIV assessment based on event trees, including the risk matrix for human, environment, and asset,
⦁ A Cost Benefit Analysis.
