DOT 2010: Deepwater riser systems integrity management - An operator's perspective

BP’s riser integrity management (IM) program is valuable to the company’s long-term strategy, according to a paper presented by Sandeep Jesudasen, Wilson Zeng, and David Petruska of BP America Inc. and Madhu Hariharan and Finlay Baxter of 2H Offshore Inc. at the Deep Offshore Technology Conference and Exhibition in Houston.

Offshore staff

HOUSTON -- BP’s riser integrity management (IM) program is valuable to the company’s long-term strategy, according to a paper presented by Sandeep Jesudasen, Wilson Zeng, and David Petruska of BP America Inc. and Madhu Hariharan and Finlay Baxter of 2H Offshore Inc. at the Deep Offshore Technology Conference and Exhibition in Houston.

BP America Inc. said that an effective riser IM program includes risk based integrity (RBI) assessment, monitoring and inspection plan, key performance indicators with alert levels, and anomaly tracking and resolution. The program results in reduced downtime, better understanding of riser performance under extreme loads, clear estimation of remainder life, confirmation of any damage to the riser, improved anomaly tracking with clear management strategy on schedules, improving cost efficiency by targeting inspection on critical areas and data to improve riser design for future projects.

BP’s Gulf of Mexico operations went from one FPS in 1999 to seven in 2006. As one result, a central marine engineering team was formed to address IM requirements for these floaters and their risers. The team looked at the seven different types of risers attached to three different hull designs. Riser design depends heavily on selected design basis data and design methods developed and optimized over the years.

A riser IM program was commenced with 2H Offshore Inc. as the primary riser IM contractor with the support of iicorr Inc. and AtkinsBoreas as specialists in Risk Based Inspection (RBI) and flowline engineering respectively. Objectives of the IM program include:

• Conformance with BP IM Standard and Operating Management System (OMS)
• Assure ongoing availability of plant and equipment
• Evaluation of riser and flowline structural performance / material degradation
• Management of risk – to personnel, asset and environment
• Define inspection requirements and intervals
• Develop riser information database.

Also these IM plans also comply with all regulatory requirements set by the Minerals Management Service (MMS) and the various applicable codes and standards, such as those provided by the American Petroleum Institute (API) and Det Norske Veritas (DnV).

The initial set-up to build the IM program includes design, fabrication, installation, and operations information and document collection plus riser benchmarking for emergency response using finite element models of the riser response compared to reports from the design contractor.

From here, a risk-based integrity (RBI) assessment provides a way to determine the consequences of a loss of integrity and also the probability for each type of failure.

This RBI assessment forms the basis of the riser integrity management plan (IMP). The IMP consists of the following:
• A delineation of system components covered in the plan
• Organization roles and responsibilities
• Asset inspection schedule
• Definition of KPIs and thresholds
• A list of project-specific deliverables.

This is followed by implementation of the IMP.

03/03/2010

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