Assessment techniques cover flaws/damages including: general and localized corrosion, localized pitting, weld misalignment and shell distortions, crack-like flaws, groove-like flaw.......on pressure vessels, piping and storage tanks.

Base on API 579-1 Fitness-For-Service (FFS) or ASME FFS-1 code to provide suitable means for evaluation of the structural integrity of these post-construction component.

An FFS assessment is an engineering analysis (mainly stress analysis) to determine whether the component is fit for continued service, typically until the next shutdown.

The product of a FFS assessment is a decision to run as is, monitor, repair, or replace. Guidance on an inspection interval is also provided.

a. FFS benefits

- Provide technically sound consensus approaches that ensure the safety of plant personnel and the public while aging equipment continues to operate.
- Can be used to maintain availability and enhance the long-term economic performance of plant equipment.

b. Assessment Levels

- Level 1

Can be performed by plant inspection or engineering personnel. It includes simple calculations.
Most conservative result and easy to use.

-Level 2

More complex than Level 1 and can be performed by only engineers with experience in API/ASME FFS.
More precise result as compared to Level 1, more detailed analysis /data.

- Level 3

Most advance assessment level and can be performed by highly expert engineers.
Include computer simulations like FEA (finite element analysis)
Generally ANSYS or Solidwork Software is used.

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c. Procedure

There are 8 steps in the FFS assessment procedure:
- 1. Identification of flaw and damage mechanism
- 2. Applicability and limitations
- 3. Data requirements
- 4. Assessment techniques & Acceptance criteria
- 5. Remaining life evaluation
- 6. Remediation
- 7. In-service monitoring
- 8. Documentation

fitness for services procedure

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d. Who performs?

- High expertise engineer (years of experience > 20) from Ultragen Canada.