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API API 579-1 Document Information:
Title
Fitness-for-Service
American Petroleum Institute
Publication Date:
Jun 5, 2007
Scope:
The methods and procedures in this Standard are intended to
supplement and augment the requirements in API 510, API 570, API
653, and other post construction codes that reference FFS
evaluations such as NB-23.
The assessment procedures in this Standard can be used for
Fitness-For-Service assessments and/or rerating of equipment
designed and constructed to the following codes
a) ASME B&PV Code, Section VIII, Division 1
b) ASME B&PV Code, Section VIII, Division 2
c) ASME B&PV Code, Section I
d) ASME B31.1 Piping Code
e) ASME B31.3 Piping Code
f) API 650
g) API 620
The assessment procedures in this Standard may also be applied
to pressure containing equipment constructed to other recognized
codes and standards, including international and internal corporate
standards. This Standard has broad application since the assessment
procedures are based on allowable stress methods and plastic
collapse loads for non-crack-like flaws, and the Failure Assessment
Diagram (FAD) Approach for crack-like flaws (see Part 2 , paragraph
2.4.2).
a) If the procedures of this Standard are applied to pressure
containing equipment not constructed to the codes listed in
paragraph 1.2.2, then the user is advised to first review the
validation discussion in Annex H. The information in Annex H, along
with knowledge of the differences in design codes, should enable
the user to factor, scale, or adjust the acceptance limits of this
Standard such that equivalent FFS inservice margins can be attained
for equipment not constructed to these codes. When evaluating other
codes and standards the following attributes of the ASME and API
design codes should be considered:
1) Material specifications
2) Upper and/or lower temperature limits for specific
materials
3) Material strength properties and the design allowable stress
basis
4) Material fracture toughness requirements
5) Design rules for shell sections
6) Design rules for shell discontinuities such as nozzles and
conical transitions
7) Design requirements for cyclic loads
8) Design requirements for operation in the creep range
9) Weld joint efficiency or quality factors
10) Fabrication details and quality of workmanship
11) Inspection requirements, particularly for welded joints
b) As an alternative, users may elect to correlate the
pressure-containing component's material specification to an
equivalent ASME or API listed material specification to determine a
comparable allowable stress. This approach provides an entry point
into the ASME or API codes (refer also to Annex A) wherein the
pressure-containing component is reconciled or generally made
equivalent to the design bases assumed for this Standard. Hence,
general equivalence is established and the user may then directly
apply the acceptance limits of the Fitness-For-Service procedures
contained in this Standard. Equivalent ASME and ASTM material
specifications provide a satisfactory means for initiating
reconciliation between the ASME and API design codes and other
codes and standards. However, the user is cautioned to also
consider the effects of fabrication and inspection requirements on
the design basis (e.g., joint efficiency with respect to minimum
thickness calculation).
The Fitness-For-Service assessment procedures in this Standard
cover both the present integrity of the component given a current
state of damage and the projected remaining life. Assessment
techniques are included to evaluate flaws including: general and
localized corrosion, widespread and localized pitting, blisters and
hydrogen damage, weld misalignment and shell distortions,
crack-like flaws including environmental cracking, laminations,
dents and gouges, and remaining life assessment procedures for
components operating in the creep range. In addition, evaluation
techniques are provided for condition assessment of equipment
including resistance to brittle fracture, long-term creep damage,
and fire damage.
Analytical procedures, material properties including
environmental effects, NDE guidelines and documentation
requirements are included in the Fitness-For-Service assessment
procedures in this Standard. In addition, both qualitative and
quantitative guidance for establishing remaining life and
in-service margins for continued operation of equipment are
provided in regards to future operating conditions and
environmental compatibility.
The Fitness-For-Service assessment procedures in this Standard
can be used to evaluate flaws commonly encountered in pressure
vessels, piping and tankage. The procedures are not intended to
provide a definitive guideline for every possible situation that
may be encountered. However, flexibility is provided to the user in
the form of an advanced assessment level to handle uncommon
situations that may require a more detailed analysis.
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