Piping Stress Analysis Part-IIG.Palani

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Table of Content How are piping system classified by stress?Advantage in using accurate restraint stiffnessPiping Nozzle EvaluationMethods for analyzing equipment nozzle loadsCentrifugal Pumps and Pressure Vessel nozzle load details

Expansion LoopsExpansion Loop ExamplesThermal ExpansionEquipment AnchorsUsing Coordinates to find free expansionExpansion influencing vessel anchor endDifferent Expansion Coefficients Piping SystemLine Spacing RequirementLocating Friction BalanceAttachmentsForce NomographStress NomographStress Pipeway Layout (Attached Separately)

How are piping system classified by stress?Critical Service Piping Systems By computer analysisIntermediate Service Piping Systems By manual calculationMild Service Piping Systems By Visual Inspection

Expansion LoopsNeed for Expansion Loop Disadvantage Points to RememberExpansion Loop RequirementsLocating Pipeway Loops Multiple Loops

Points to Remember (Example & Drawings)

Points to Remember (Example & Drawings) Cont

Points to Remember (Example & Drawings) Cont

Expansion Loop Examples

Kellogg Charts C-11 & C12 for Symmetrical Expansion Loop sizing and Calculating Forces & Moments

Kellogg Charts C-11 & C12 for Symmetrical Expansion Loop sizing and Calculating Forces & Moments (Cont.)

Expansion Loop Example 3

Thermal ExpansionEquipment Anchors Using coordinates to find free expansionExpansion influencing Vessel Anchor End Different expansion coefficients have an effect in the piping expansion calculation Line Spacing Requirement Locating Friction Balance

Thermal Expansion (Example-4)

Thermal Expansion (Example-5)Case-1

Thermal Expansion (Example-5)Case-2

Thermal Expansion (Example-6)

Thermal Expansion (Example-7)

Thermal Expansion (Example-8)

Thermal Expansion (Example-9)

Line Spacing Requirement

Thermal Expansion (Example-10)

Thermal Expansion (Example-10) Cont

Advantage in using accurate restraint stiffness Case-1: Case-2:

Steam Turbine-NEMA SM-23Centrifugal Pumps-API 610Centrifugal Compressors-API 617Air Cooled Heat Exchangers-API 661Pressure Vessels-WRC 107 / 297

Methods for Analyzing Equipment Nozzle loadsPerforming a testFinite Element AnalysisInternational Codes and Standards Piping Nozzle Evaluation

API-610 Centrifugal PumpsAllowable Pump Nozzle loading details

Annexure-F (Criteria for Piping Design)Horizontal Pumps - Conditions of Annexure-F

Annexure-F (Criteria for Piping Design) ContVertical Pumps - Conditions of Annexure-F

WRC Bulletin 107 Analysis WRC Local Coordinates and Stress Points

WRC 107 should not be used if either of the following inequalities is not satisfied:

d/D < 0.33D/T > 50 Where:D=mean diameter of vessel, ind=outside diameter of nozzle, inT=thickness of vessel wall, in

Caesar Program Table format

ASME Section VIII Div. 2 Requirements on WRC-107 AD-160 Fatigue EvaluationAD-160.1Operating ExperienceAD-160.2Rules to determine need for Fatigue Analysis of Integral parts of Vessels: AD-160.3Rules to determine need for Fatigue Analysis of Nozzles with separate reinforcement and non-integral attachments such as pad type reinforcement, fillet welded attachment etc. The three calculated stress intensities using WRC-107 must now be compared to:Pm < SmPm + Pl