Profast is designed for planning of cost-efficient inspection of offshore jacket structures and re-qualification of existing structures. Profast can also be used for other types of structures where fatigue crack growth is considered.
The main objective of Profast is to enable the user to reduce the cost of fatigue damage inspection of the structure. During the design phase Profast is used to design the structure for minimal inspection, and to efficiently plan the inspection of the structure after installation.
During the operational phase Profast is used to update the inspection plan with results from already executed inspections, in order to efficiently use the information gained and minimise the future inspection costs.
Benefits
Determine your fatigue prone areas and reduce inspection costs.
Profast primarily provides the following four main decision support results:
- Reliability at a hotspot wt. Fatigue failure. The reliability (or the failure probability) wt. Fatigue failure as a function of time based on either an S-N fatigue model or a Paris-Erdogan crack growth model is computed.
Updated reliability result - The reliability as function of time updated on basis of inspection findings and optionally repair.
Inspection planning - prescribed inspection time
For a given inspection quality, inspection (and possibly repair) history, predefined inspection intervals and a predefined reliability threshold, the joints necessary to inspect are identified. The procedure is based on the assumption that none of the inspections will find a crack.- Inspection planning - optimised inspection time
For a given inspection quality, inspection (and possibly repair) history and a predefined reliability threshold, the optimised time to next inspection is computed for a joint or a group of joints selected by the user.
In addition, a deterministic and probabilistic calculation of the S-N based fatigue life time and crack growth based life time may be performed.