API 579 Fitness For Service Overview

CBIA Conference 2017
API 579 Fitness For Service Overview
October 18, 2017

Dexter Nigos
Agenda
• Fitness for Service Background

• Introduction
• Joint API/ASME FFS Standard (2000 edition)
• Jurisdictional Requirements
• Fitness For Service Overview
• Scope and Applications
• Procedure
• Example Problems
• Section 4 – General Metal Loss
• Section 5 – Localize Metal Loss
• Section 6 – Pitting Corrosion
• Section 9 – Crack-Like Flaws
• Overview of 2007 FFS Edition

• Technical Basis and Validation of 2007 Edition
• API 579-1/ASME FFS-1 2016 Edition
2
Fitness for Service Introduction
• ASME and API codes and standards provide guidelines for design,
fabrication, inspection and testing.
• These codes do not provide guidelines for evaluating equipment

that have been in service.
• ASME formed Post Construction Main Committee (PCC) in late

1990s to develop standards for in-service fixed equipment
• API CRE Task Group continued to develop API 579, many

committee members served on both committees.
3
Fitness for Service Introduction
• The first edition of API 579 Fitness-For-Service (FFS) produced by
API CRE FFS Task Group was issued in 2000 and became the de
facto international Fitness-For-Service (FFS) Standard for pressure
containing equipment in the refining and petrochemical industries
• In order to streamline development efforts, pool resources, and

promote widespread regulatory acceptance, API and ASME agree
to form a joint committee to produce a single FFS standard that can
be used for pressure-containing.
4
Joint API/ASME FFS Standards Committee
• Joint API/ASME Committee formed, first meeting takes place on
February 5, 2002
• Polices and procedures manual developed covering
• Charter
• Organization
• Officers
• Membership
• Meetings
• Committee Actions (Voting and Balloting)
• Public Review and Submittal to ANSI
• Interpretations
• Appeals
• Records
• Polices and procedures manual approved by API CRE and ASME
BPTCS
5
Jurisdictional Requirement
• CCR Title 8, Chapter 4, Subchapter 15 Petroleum Safety Orders,
Article 18 – Unfired Pressure Vessels, Boilers and Fired Pressure
Vessels, §6857(c)(3):
• Program to include (summary):

• Acceptance by signature of the plant management
• The type of vessels covered
• Documentation
• Involvement of Operations, Engineering, Inspection, and maintenance
• Procedure for notifying the Division.
6
Fitness for Service Overview
Scope
• Supplement and augment requirements of API
• Evaluation of both the present integrity of an equipment –
given present state of damage – and projected remaining
life.
• Evaluate equipment constructed and designed to;
• ASME Section VIII D1/D2, Section I, B31.3 and B31.1
• API 650 and 620
• International and Internal Corporate standards
• Assessment techniques include, but not limited to;

• Brittle fracture, local & general metal loss, crack-like
flaws, pitting, blistering, fire damage, etc.
• Provide in-service monitoring and NDE guidelines
• Documentation
7
Application
• Equipment constructed and designed to;
• ASME Section VIII D1/D2, Section I, B31.3 and B31.1
• API 650 and 620
• International and Internal Corporate standards
• Determine if an equipment may be operated at the original
Maximum Allowable Working Pressure (MAWP).
• Determine the minimum required thickness
• Reduced temporary MAWP based on the found
damage/flaw.
• Evaluate equipment that is discovered to be lacking
appropriate docs
• Evaluate equipment found to have not been designed or
constructed to original design criteria
8
Procedure
• Step 1 – Flaw or Damage Mechanism Identification
9
Procedure (cont.)
• Step 2 – Applicability and Limitations
• Step 3 – Data Requirements

• See Table 2.2 in API 579 for overview of data required
• Examples; Thickness profiles, pitting depth, dimensions
of crack-like flaws, etc.
• Extent of information and data required depends on
level of assessment and damage mechanism being
valuated.
• Step 4 – Assessment Techniques and Acceptance Criteria

• Level 1, 2 and 3 assessments
10
Procedure (cont.)
• Step 5 – Remaining Life Calculation
• Use to establish inspection plan, intervals and any
remediation
• Estimates with adequate safety factor
• Step 6 – Remediation
• Coating/lining to isolate the environment
• Drilling of blisters, monitoring, repair, etc.
• Changes to the process stream
• Step 7 – In-Service Monitoring

• Increase confidence in the remaining life assessment
• Step 8 – Documentation
• All calculations and documentation used to perform the
analysis. 11
Example Problems
Example #1 – General Metal Loss

• Result from corrosion, erosion or both.
• Based on thickness averaging approach.
Applicability And Limitations

• Uniform or local
• Can calculate reduced MAWP if acceptance criteria are not
satisfied
• Some limitations depending on level of assessment (level 1,
2 or 3):
• No crack-like flaws .
• No notches i.e. local stress concentrations
• Not in creep regime
• Not in cyclic service
12
Example Problems
Example #1 – General Metal Loss (PART 4)
13
Example Problems
Example #1 – General Metal Loss (cont.)
• Follow assessment techniques and acceptance criteria in Part

4 of API 579 (Level 1 => Level 2 => Level 3, as needed).
• Failed Level 1 assessment.
• Passed Level 2 assessment at a reduced MAWP.
• Alternatively, use industry recognized software (Plant

Manager, CodeCalc, etc) to complete the assessment. 14
Example Problems
15
Example Problems
16
17
Example Problems
18
Example Problems
Example #2 – Local Metal Loss (PART 5)
19
Example Problems
Example #2 – Local Metal Loss
20
Example Problems
Example #2 – Local Metal Loss (cont.)
• Passed Level 1 Assessment slightly reduced MAWP (Original

Design Pressure = 300psig)
21
Example Problems
Example #3 – Pitting (PART 6)
Applicability and Limitations

• Can be used to evaluate general and localized pitting.
• Can calculate reduced MAWP if acceptance criteria are not
satisfied
• For Level 1 and 2, some rules in PART 5 may apply.
• Level 2 assessment if pitting damage is on both sides.
• NOTE: Precise measurement of pitting is difficult.
22
Example Problems
Example #3 – Pitting (cont.)
23
Example Problems
24
Example Problems
• Follow Level 1 assessment per Part 6

• Perform Level 2 or 3 assessment as needed. 25
Example Problems
26
Example Problems
27
Example Problems
• 2007 Edition – Pitting Charts
28
API 579-1/ASME FFS-1, 2007 Edition
Overview
• Released on 2Q2007
• Includes new enhancements and new parts covering FFS
assessment procedures that address unique damage
mechanism:
 Part 5 - Assessment of Local Thin Areas
 Level 1 screening procedure modified
 Assessment procedures for gouges have been relocated to
Part 12
 Part 7 - Assessment of Blisters and HIC/SOHIC Damage
 Assessment procedures for HIC/SOHIC damage have been
added
 Assessment of lamination moved to Part 13
 Part 8 - Assessment of Weld Misalignment and Bulges
 Assessment procedures for bulges removed
 Assessment procedures for dents, gouges, and dent-gouge
combinations have been relocated to Part 12
29
Overview (cont.)
 Part 10 - Assessment of Equipment Operating in the Creep
Range,
 Assessment procedures for remaining life calculations for
components with or without crack-like flaws have been
added, New Part
 Part 12 - Assessment of Dents, Gouges, and Dent-Gouge
Combinations, New Part
 Part 13 - Assessment of Laminations, New Part
• New enhancements to existing annexes.

• New annexes
• API-1/ASME FFS-1 2007 Edition to supersede API 579-2000

Edition.
30
Technical Basis and Validation

• Joint API/ASME FFS Committee committed to publishing the
technical basis to all FFS assessment procedures utilized in
API 579-1/ASME FFS-1 2007 in the public domain
• NBIC has supporting language for Fitness for Service in NB-

23 Part 2 Inspection.
• Appendix H of API 579-1/ASME FFS-1 2007 provides an

overview of technical basis and validation with related
references organized by damage type; the references are
published in a series of WRC Bulletins and technical papers
• Publication of technical background has been instrumental in

obtaining acceptance from regulatory bodies
31
32

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What is the purpose of Fitness for Service assessments?

What is the purpose of Fitness for Service assessments?

What are some examples of damage mechanisms addressed in API 579?

What are some examples of damage mechanisms addressed in API 579?

CBIA Conference 2017

API 579 Fitness For Service Overview

October 18, 2017

• Fitness for Service Background

• Overview of 2007 FFS Edition

• These codes do not provide guidelines for evaluating equipment

• ASME formed Post Construction Main Committee (PCC) in late

• API CRE Task Group continued to develop API 579, many

• In order to streamline development efforts, pool resources, and

• Program to include (summary):

• Assessment techniques include, but not limited to;

• Step 3 – Data Requirements

• Step 4 – Assessment Techniques and Acceptance Criteria

• Step 7 – In-Service Monitoring

Example #1 – General Metal Loss

Applicability And Limitations

Example #1 – General Metal Loss (PART 4)

Example #1 – General Metal Loss (cont.)

• Follow assessment techniques and acceptance criteria in Part

• Alternatively, use industry recognized software (Plant

Example #1 – General Metal Loss (cont.)

Example #1 – General Metal Loss (cont.)

Example #2 – Local Metal Loss (PART 5)

Example #2 – Local Metal Loss

Example #2 – Local Metal Loss (cont.)

• Passed Level 1 Assessment slightly reduced MAWP (Original

Applicability and Limitations

• Follow Level 1 assessment per Part 6

• New enhancements to existing annexes.

• API-1/ASME FFS-1 2007 Edition to supersede API 579-2000

Technical Basis and Validation

• NBIC has supporting language for Fitness for Service in NB-

• Appendix H of API 579-1/ASME FFS-1 2007 provides an

• Publication of technical background has been instrumental in

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