Subsea Tie-ins

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Subsea tie-ins present a cost and schedule-effective means of introducing hydrocarbon production into existing pipeline systems. Hot-tapping and intervention under local isolation are proven methods to execute such tie-ins and have been used for many years. Despite the successful track record, these methods and the execution of works on a live pipeline system cannot be described as every day activities for Operators or EPC contractors.

Like all construction works, the execution of subsea tie-in works presents HSE and CAPEX / OPEX risks… but unlike typical construction works, the high consequence of failure associated with working on a live system (implications to the environment, operational revenue and Operator reputation) means that risks with even a very small likelihood must be managed by either: - 

• Removing the risk (making the works inherently safe); or 
• Modifying the works so that the associated risk is as As-Low As Reasonably Practical (ALARP), either by lowering the likelihood of failure or the consequence of failure. 

Managing such risks can be time consuming, particularly where there are multiple options under consideration. It is therefore very important that risks are correctly identified / managed from an early stage, with the input from engineering specialists who are familiar with the works and with input from (and regular feedback given back to) all interested parties (both internal and external).  

HT-C is an ideal partner to help our customers to not only examine intervention feasibility but to also help identify and manage associated risk.