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Fitness for Services and Remaining Life Assessment (FFS)

Fitness for services (FFS) is detail mechanical calculation to evaluate a defect or damaged component or equipment,  found by inspection,  in order to determine the remaining strength (in terms of maximum allowable working/operating pressure) and remaining life of mechanical and pressurized equipment. FFS is performed to arrive at run-repair-replace-down rate decision making on defect or damaged equipment or component having dimension beyond design acceptance criterion.  Remaining life is estimated by considering its damage rates (e.g, corrosion rate, crack propagation rate or creep rate) to determine the next inspection, maintenance or repair plan.  The end of life of component according to FFS calculation does not necessarily means the end of its  physical life. When involving defect of weld area (piping, pipeline, etc) FFS is sometimes refer to engineering critical assessment (ECA).



Benefit of FFS

a. It improves the reliability and safety aspects. 

b. It increases the effectiveness and efficiency of inspection and maintenance. 

c. It increases operational life time of the equipment (life extension program). 

d. It improves the public trust to operator/owner performance because indicate open risk and integrity management. 

e. It increases the company value since reliability is assured and so decrease the annual insurance cost). 

f. It decreases the inspection and maintenance cost. 

g. It increases the equipment life time because the damage can be detected and identified earlier and thus more focus on risk         management.