API 579-1

API 579-1

Fitness-For-Service
FITNESS-FOR-SERVICE
Fitness-For-Service
Fitness-for-Service

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Publication Date: 06/01/2016 - Complete Document

Description :

Foreword

In contrast to the straightforward and conservative calculations that are typically found in design codes, more sophisticated assessment of metallurgical conditions and analyses of local stresses and strains can more precisely indicate whether operating equipment is fit for its intended service or whether particular fabrication defects or in-service deterioration threaten its integrity. Such analyses offer a sound basis for decisions to continue to run as is or to alter, repair, monitor, retire or replace the equipment.

The publication of the American Petroleum Institute’s Recommended Practice 579, Fitness-For-Service, in January 2000 provided the refining and petrochemical industry with a compendium of consensus methods for reliable assessment of the structural integrity of equipment containing identified flaws or damage. API RP 579 was written to be used in conjunction with the refining and petrochemical industry’s existing codes for pressure vessels, piping and aboveground storage tanks (API 510, API 570 and API 653). The standardized Fitness- For-Service assessment procedures presented in API RP 579 provide technically sound consensus approaches that ensure the safety of plant personnel and the public while aging equipment continues to operate, and can be used to optimize maintenance and operation practices, maintain availability and enhance the long-term economic performance of plant equipment.

Recommended Practice 579 was prepared by a committee of the American Petroleum Institute with representatives of the Chemical Manufacturers Association, as well as some individuals associated with related industries. It grew out of a resource document developed by a Joint Industry Program on Fitness-For- Service administered by The Materials Properties Council. Although it incorporated the best practices known to the committee members, it was written as a Recommended Practice rather than as a mandatory standard or code.

While API was developing Fitness-For-Service methodology for the refining and petrochemical industry, the American Society of Mechanical Engineers (ASME) also began to address post-construction integrity issues. Realizing the possibility of overlap, duplication and conflict in parallel standards, ASME and API formed the Fitness-For-Service Joint Committee in 2001 to develop and maintain a Fitness-For-Service standard for equipment operated in a wide range of process, manufacturing and power generation industries. It was intended that this collaboration would promote the widespread adoption of these practices by regulatory bodies. The Joint Committee included the original members of the API Committee that wrote Recommended Practice 579, complemented by a similar number of ASME members representing similar areas of expertise in other industries such as chemicals, power generation and pulp and paper. In addition to owner representatives, it included substantial international participation and subject matter experts from universities and consulting firms.

In June 2007, the Fitness-For-Service Joint Committee published the first edition of API 579-1/ASME FFS-1 Fitness-For-Service. The 2016 publication of API 579-1/ASME FFS-1 includes a number of modifications and technical improvements. Some of the more significant changes are the following:

• Reorganized the standard to facilitate use and updates.

• Expanded equipment design code coverage.

• Added Annex for establishing an allowable Remaining Strength Factor (RSF).

• Simplified Level 1 criterion for the circumferential extent of a Local Thin Area (LTA) through the modification of the Type A Component definition and subdivision of Type B Components into Class 1 or Class 2.

• Updated crack-like flaw interaction rules.

• Re-wrote weld residual stress solution Annex for use in the assessment of crack-like flaws

• Updated guidance on material toughness predictions for use in the assessment of crack-like flaws.

• Updated evaluation procedures for the assessment of creep damage.

• Added Annex covering metallurgical investigation and evaluation of mechanical properties in a fire damage assessment.

• Developed new Part 14 covering the assessment of fatigue damage.

This publication is written as a standard. Its words shall and must indicate explicit requirements that are essential for an assessment procedure to be correct. The word should indicates recommendations that are good practice but not essential. The word may indicate recommendations that are optional

Most of the technology that underlies this standard was developed by the Joint Industry Program on Fitness- For-Service, administered by The Materials Properties Council. The sponsorship of the member companies of this research consortium and the voluntary efforts of their company representatives are acknowledged with gratitude.

The committee encourages the broad use of the state-of-the-art methods presented here for evaluating all types of pressure vessels, boiler components, piping and tanks. The committee intends to continuously improve this standard as improved methodology is developed and as user feedback is received. All users are encouraged to inform the committee if they discover areas in which these procedures should be corrected, revised or expanded. Suggestions should be submitted to the Secretary, API/ASME Fitness-For-Service Joint Committee, The American Society of Mechanical Engineers, Two Park Avenue, New York, NY 10016, or SecretaryFFS@asme.org.

There is an option available to receive an e-mail notification when errata are posted to a particular code or standard. This option can be found on the Committee Web at http://go.asme.org/ffscommittee after selecting “errata” in the “Publication Information” section

This standard is under the jurisdiction of the ASME Board on Pressure Technology Codes and Standards and the API CRE Committee and is the direct responsibility of the API/ASME Fitness-For-Service Joint Committee. The American National Standards Institute approved API 579-1/ASME FFS-1 2016 in June, 2016.

Although every effort has been made to assure the accuracy and reliability of the information that is presented in this standard, API and ASME make no representation, warranty, or guarantee in connection with this publication and expressly disclaim any liability or responsibility for loss or damage resulting from its use or for the violation of any regulation with which this publication may conflict.

Document Type : Complete Document

Language : English

Page Count : 1320

Publication Date : 06/01/2016

Revision : 16

Status : Current

Title : Fitness-For-Service

Publication Date: 02/01/2009 - Complete Document

Document Type : Complete Document

Page Count : 1298

Publication Date : 02/01/2009

Revision : 2

Status : Historical

Title : FITNESS-FOR-SERVICE

Publication Date: 02/01/2009 - Amendment *

Description :

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.

Document Type : Amendment

Edition : Second Edition

Language : English

Page Count : 170

Publication Date : 02/01/2009

Revision : 2

Status : Historical

Title : Fitness-For-Service

Publication Date: 06/05/2007 - Base Document *

Description :

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.

Document Type : Base Document

Edition : Second Edition

Language : English

Page Count : 1128

Publication Date : 06/05/2007

Revision : 2

Status : Historical

Title : Fitness-for-Service

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