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| 2009/11/13 |
| 제목 : API 579-2, API 579-1
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| 글쓴이 : 고객지원팀 |
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API 579-2, August 2009 - Fitness-for-Service Example Problem Manual,**Same as ASME FFS-2**,
1st Edition- Example problems illustrating the use and calculations required for Fitness-For-Service
Assessments described in API 579-1/ASME FFS-1 are provided in this document. Example problems
are provided for all calculation procedures in both SI and US Customary units.
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Document Summary
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API 579-2
Revision / Edition: 1
Date: 08/11/2009
Title: FITNESS-FOR-SERVICE EXAMPLE PROBLEM MANUAL ***SAME AS ASME FFS-2***
Page Count: 374
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Document Abstract
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▶ Scope:
Example problems illustrating the use and calculations required for Fitness-For-Service Assessments
described in API 579-1/ASME FFS-1 are provided in this document. Example problems are provided
for all calculation procedures in both SI and US Customary units.
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References
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* API 579-1 CD - Fitness-for-Service
* ASME FFS-1 - Fitness-For-Service
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API 579-1, 2007 - Fitness-for-Service,**Same as ASME FFS-1**, 2nd Edition- 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 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.
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Document Summary
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API 579-1
Revision / Edition: 2
Date: 06/05/2007
Title: FITNESS-FOR-SERVICE ***SAME AS ASME FFS-1***
Page Count: 1128
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Document Abstract
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▶ 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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References
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* API RP 571 - Damage Mechanisms Affecting Fixed Equipment in the Refining Industry
* BSI BS 7910 - Guide to methods for assessing the acceptability of flaws in metallic structures
* NACE RP0296 - Guidelines for Detection, Repair, and Mitigation of Cracking of Existing Petroleum
Refinery Pressure Vessels in Wet H2S Environments
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