a complete ffs solution · investigators of the international standard api 579-1/ asme ffs-1...

WHO WE ARE

E²G|The Equity Engineering Group, Inc. is internationally recognized in the refining and petrochemical industries as a leader in aging infrastructure services and support.

• E2G engineers pioneered the advancement of Fit-ness-for-Service (FFS) technologies and were the lead investigators of the international standard API 579-1/ASME FFS-1 (API-579).

• The document has rapidly become the FFS standard of choice for other industries including pulp & paper, fossil utility, food processing, and non-commercial nuclear.

API 579/ASME FFS FOR THE WEBA COMPLETE FFS SOLUTION

FFS ASSESSMENTS

AN INTUITIVE USER

INTERFACE

FAST COMPUTATIONS

ON ANY DEVICE

Part 3Brittle Fracture

Part 2FFS Overview

Part 1Introduction

Parts 4 and 5Thinning

Part 6Pitting

Part 7Hydrogen Damage

Part 8Shell Distortion

Part 9Crack-like Flaws

Part 10Creep

Part 11Fire Damage

Part 12Dents and Gouges

Part 13Laminations

Part 14Fatigue Damage

E2G | The Equity Engineering Group, Inc

WHY THE WEB?

• No installation - No maintenance - Ever• Runs in any compatible web browser• Access on phones, tablets, and desktop browsers• Calculations handled on powerful cloud servers • Does not consume local CPU resources• Instant access to updates and improvements• User friendly and easy to use, despite complex calcu-

lations going on under the hood

Corporate Headquarters 20600 Chagrin Boulevard, Suite 1200Shaker Heights, OH 44122www.EquityEng.com

For More Information:P. 216-283-9519E. [email protected]. EquityEng.com/API-579ASME-FFS

API 579 / ASME FFS – FOR THE WEB

The new web-based delivery of API-579 offers a complete set of WebTools for conducting a fitness-for-service assessment. Each Part of API-579 is included as a separate WebTool. The WebTools incorporate the most recent updates to API-579 and offer numerous features:

• Intuitive user interface; • Clear organization of results; • Modern graphics; • Automatically generated reports for easy sharing; • Ability to save and load assessments; • Easy access to help, and much more.

API 579/ASME FFS - FOR THE WEB

• Provide Feedback: At all steps, users may send feed-back, ask questions, provide general comments and rec-ommend enhancements.

• Intuitive/Concise User-Interface: Leveraging years of ongoing customer feedback, the user interface is orga-nized in an intuitive concise manner that aligns with the user’s expectations. Each tool maintains a consistent step-based workflow design. The most important and meaningful results are presented first, with additional results available at the click of a button.

• Pre-Populated Examples: Each WebTool includes a cata-logue of pre-populated examples to demonstrate typical use cases and highlight specific capabilities.

• Save/Load Cases: Each assessment can be saved to the user’s local hard drive, and files from previous assess-ments can be loaded to automatically populate all fields.

• PDF Reports: A printable or downloadable PDF report is generated with each assessment that contains all inputs necessary to reproduce the calculation, and all primary and intermediate results.

• US/SI Units: Each WebTool is compatible with both im-perial (US Customary) unit and metric (SI) systems.

• Extensive Material Database: Each WebTool has access to E2G’s extensive material property database with cov-erage of the most popular construction codes, i.e. ASME Section I, VIII-1, VIII-2, B31.1, B31.3, B31.4, and B31.8.

• Excel Compatible: Tabular input data may be entered di-rectly or copy-and-pasted from Excel.

• Data Validation: Logic checks are built into the input fields so that users are alerted of out-of-bounds condi-tions that may lead to misleading results or errors.

• Information Buttons: Info buttons direct users to addi-tional information for input fields that warrant a more thorough explanation.

• Instructional Videos: While the interface is designed for simplicity, videos are included throughout EEC to pro-vide additional guidance.

• Verification: Extensive software verification and quality management per ISO 9001.


Part Damage Mechanism Level Professional ExpertPart 1 Introduction N/A ☑ ☑

Part 2 FFS Overview N/A ☑ ☑

Part 3 Brittle Fracture1, 2 ☑ ☑

3 ☑

Parts 4 & 5 General and Local Thnning 1,2 ☑ ☑

Part 6 Pitting 1,2 ☑ ☑

Part 7 Hydrogen Damage 1,2 ☑ ☑

Part 8 Shell Distortion 1,2 ☑ ☑

Part 9 Crack-Like Flaws 1,2 ☑ ☑

Part 10 Creep 1,2 ☑ ☑

Part 11 Fire Damage 1,2 ☑ ☑

Part 12 Dents and Gouges 1,2 ☑ ☑

Part 13 Laminations 1,2 ☑ ☑

Part 14 Fatigue Damage1,2 ☑ ☑

3 ☑

SOFTWARE CAPABILITIES

GENERAL CAPABILITIES


PART 3 – BRITTLE FRACTURE

Level 1• Screening of equipment for susceptibility to

brittle fracture• Point wise screening check of MAT at MAWP

Level 2 • Includes Methods A and B

• Method A – Determines safe operating MAT envelope

• Method B – Hydrostatic pressure checkLevel 3

• Detailed assessment using fracture mechanics, based on Part 9

• Evaluation of controlling factors: stress, flaw size, and toughness

What Else?• User defined operating envelope may be input for comparison

PARTS 4 AND 5 – GENERAL AND LOCAL THINNING

Levels 1 and 2• Thickness readings input options:

• Random Point Thickness Readings (PTR)• Critical Thickness Profile (CTP)• Grid of thickness readings

• No limit to number of thickness readingsWhat Else?

• Applicable to Type A components per API 579-1/ASME FFS-1

• Acceptability criterion based on MAWP and thickness criteria

• Remaining life from user-specified corrosion rate• Output includes visuals of thickness readings

ContourPlotofThicknessMeasurements

LongitudinalDirection(in)

Circum

ferentialD

irection(in

)4

2

1

00 2 4 6 8

0.9

0.8

0.7

0.6

3

0.5

5

6

AllowableInternalPressure– Temperature(MAT)Envelope

Temperature(F)

Pressure(psi)

150

100

50

0-150 -100 -50 0 50 100

Pressure-TemperatureCurveUserOperatingCurve

API 579/ASME FFS - FOR THE WEB (PARTS 3-6)



PART 6 – PITTING

Level 1• Screening comparison with standard pitting charts• Generate custom pit charts

Level 2• Widespread pitting and localized pitting• Based on detailed pit-couple interactions

What Else?• No limits on number of pit-couple interactions• Applicable to Type A components per API 579-1/ASME FFS-1• Acceptability criterion based on both MAWP and thickness

CustomPittingChart(15%PitDensity)

Length(in)

Width(in)

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0.00.0 1.0 2.0 3.0 4.0


PART 8 – SHELL DISTORTION

Level 1• Based on construction code fabrication tolerances

Level 2• Includes fatigue assessment

• ASME smooth bar or welded joint fatigue curveWhat Else?• Includes misalignment and/or out-of-roundness• Centerline offset and/or angular misalignment• Longitudinal and circumferential weld seams• Global and arbitrary-shape out-of-roundness

PART 7 – HYDROGEN DAMAGE

Level 1• Screening criteria for hydrogen damage

Level 2• HIC Strength Assessment evaluating using RSF

approach• HIC Crack-like Flaw Assessment based on Part 9,

Level 2• Hydrogen Blister Assessment evaluated as local

metal loss (Part 5) • Hydrogen Blister Assessment includes check for

periphery cracksWhat Else?

• Accounts for both hydrogen blisters and HIC



PART 9 – CRACK-LIKE FLAWS

Level 1• Determines limiting flaw length using Level 2 with

Level 1 restrictions• Semi-elliptical surface breaking and through-wall

cracksLevel 2

• Evaluates critical crack-front points using the FAD• Semi-elliptical surface breaking, through-wall, and

embedded cracks• Cracks parallel or normal to longitudinal or

circumferential weldsWhat Else?

• Output includes critical flaw screening curve• Weld residual stress based on welding parameters• Material Toughness using Master Curve or ASME Section XI model

FailureAssessmentDiagram(FAD)SensitivityAssessment

LoadRatio,Lr

Toughn

essR

atio,K

r

1.0

0 0 0.2

AcceptableZone

0.8

0.6

0.4

0.2

0.4 0.6 0.8 1.0 1.2

SurfaceLocation(0°)ThroughWallLocation(90°)

PART 10 – CREEP

Level 1• Screening criteria for creep damage• Specified target component life and operating

temperature• Provides conservative estimate of creep-governed

allowable stress • Specify multiple historical operating conditions for

comparison• Duration, pressure, temperature, corrosion

rateLevel 2

• Calculates cumulative creep damage based on historical operating conditions

• Estimate of remaining life based on projected future conditions• Choose between MPC Omega or Larson Miller creep damage procedure


PART 11 – FIRE DAMAGE

Level 1 • Heat Exposure Zones established to determine

components that require a Level 2 assessmentLevel 2

• Estimate fire damaged tensile and allowable stress• Predict MAWP, MDMT, and retirement thickness• Accounts for flame impingement and radiant heat

of a fireWhat Else?

• Fire damage properties based on hardness test values



ELEVATION VIEWFire Source

Zone I Zone II

Zone IVZone IV

Zone V

Zone VI

PART 12 – DENTS AND GOUGES

Level 1• Limits maximum dent depth to % of outer

diameter• Part 5 methodology assuming gouge is local metal

loss• Combined dent/gouge

• Screening criteria based on dent depth to OD and gouge depth to wall thickness

Level 2• Includes a fatigue assessment for effects of cyclic

pressure• Combined dent/gouge

• RSF approach • Determines MAWP based on dent and gouge depths

What Else?• Includes dents, gouges, and combined dents-gouges

Dent-GougeCombinationInteractionDiagram

GougeDepthtoThicknessRatio(in/in)

DentDepthto

DiameterRatio(in/in) 0.30

0 0 0.005

AssessmentPointBoundaryofAcceptability

0.25

0.20

0.15

0.10

0.05

0.010 0.015 0.020 0.025 0.030

PART 14 – FATIGUE DAMAGE

Level 1• Screening criteria for fatigue damage • Customization for in-service components

Level 2• Smooth bar and welded joint fatigue methods• Cycle counting and plasticity correction included

Level 3• Strain-life fatigue damage model• Multiaxial critical plane cycle count and search for

plane of maximum damageWhat Else?

• Palmgren-Miner damage accumulation • No limit to the size of the input loading history • Primary results are a prediction of cumulative fatigue damage and number of permissible repetitions of the

user-specified loading history until failure• Additional results include cycle data, applicable fatigue curve, and loading history plots

PART 13 – LAMINATIONS

Levels 1 and 2• Screening criteria for lamination damage• Assess laminations parallel to plate surface

Controlling factors include:• Lamination size• Orientation relative to the surface• Spacing of lamination to weld-joints,

structural discontinuities, and other laminations




a complete ffs solution · investigators of the international standard api 579-1/ asme ffs-1...

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