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Mechanical Integrity

Fitness-For-Service analysis aims at assessing whether an equipment has degraded in service and can carry on its intended function properly. This approach consists in a rational decision process which enables the engineer to determine whether the system can still be operated safely either as is, with reinforced inspection, after a requalification, or after a repair.

The Implementation Conditions

FFS can be applied when:

  • The equipment inspection and non-destructive testing have detected defects beyond the acceptable limits or those that have occurred too early.
  • The equipment design is not fully compliant with the applicable codes.
  • The equipment underwent an impact in service, in transit or during handling.
  • The equipment has never been inspected, or only partially; the equipment acquired is not new.

Your Needs

  • Financial solution which is more cost effective than the replacement of the equipment.
  • Possibility of avoiding to prematurely remove the equipment from service which should only have to be replaced at term.
  • Optimal utilization of the equipment based on a more accurate assessment of its capabilities.
  • Creating an administrative file in order to obtain a derogation.

Your Advantages
The Bureau Veritas methodology based on acknowledged international standards; API RP 579. BS 7910 or ASME B31G. This methodology is implemented by a team of engineers specialized in pressurized equipment technology, material, corrosion, structural analysis and inspection. The statutory requirements concerning equipment are also taken into account.

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On the basis of non-destructive testing:
The F.F.S. Methodology includes the following steps:

  • Evaluation of damage mechanisms associated to kinetics,
  • Equipment integrity and residual life cycle assessment,
  • Advice concerning the integrity due to future conditions.

F.F.S. Scope covers:
  • Pressurized equipment (reactor, columns, heat exchangers, LPG tanks...),
  • Atmospheric storage tanks including cryogenic (LNG),
  • Onshore pipelines,
  • Offshore pipelines & risers.
The methodology can be extended to other equipment depending upon the situation.

The damage mechanisms correspond to the following non-restrictive list:
  • Localised corrosion, whether it is general, pitting, or under insulation,
  • Stress Corrosion Cracking (SCC),
  • Metallurgical damages (intermediate phases, embrittlement...)
  • Fatigue (mechanical or thermal),
  • Crack-like flaws,
  • Creep,

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