pipe stress analysis intro pps 180605

PIPE STRESS ANALYSIS: AN INTRODUCTION

FDC- PIPINGREAL

JAMNAGAR, GUJARAT, INDIA.

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CTS Lab Admin FDC O&M Procr&

Contrc

Mech Proj Piping Elect Civil

Piping layout Design Grp.

Pipe Stress Analysis: Reliability Engg. Grp.

Safety

ConstProcess

CES

Refinery & Petrochemical(e.g. Reliance Jamnagar Refinery)v

(Not exhaustive)

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Let Us Start: MilestonesLet Us Start: Milestones•Introduction•Milestones•Piping Design & its Reliability Concern

•Pipe Stress Analysis - I: Loads on Piping System •Pipe Stress Analysis - II: Stresses on Piping System

•Pipe Stress Analysis – III: What are Stressed on Stress Analysis•Pipe Stress Analysis – IV: The Governing Codes•Pipe Stress Analysis – V: How Things Are Carried Out•Pipe Stress Analysis – VI: Interactions With Other Departments•Pipe Stress Analysis – VII: Few Technical Aspects•Pipe Stress Analysis – VIII: Roles of The Analyst •Pipe Stress Analysis – IX: Associated Instructions & Design guide/spec.•Conclusions & Q-A Session.

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Piping Design & Its Main Concerns

Techno-Commercial Concern.

Reliability Concern: Pipe-Stress-Analysis

Future Expansion Provisions.

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Reliability Concerns of Piping Design

Pipe & Piping System.

Pipe Stress.

Stress analysis.

Adding Flexibility/ Rigidity & Proper Supporting.

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Pipe Stress Analysis – IPipe Stress Analysis – I

Loads On Piping SystemLoads On Piping System

Back To School: Stress – Strain Back To School: Stress – Strain Relationship.Relationship.

Loads on the Piping System: Loads on the Piping System: *Primary Vs. Secondary*Primary Vs. Secondary*Static Vs. Dynamic*Static Vs. Dynamic

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Thermally deflected Upward at Elevated Temperature

The actual Pipe

Example of Secondary Loading: Thermal strain

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Deflection Under Weight & Sustained Loading: Primary Loads

Actual Pipe

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Pipe Stress Analysis – IIPipe Stress Analysis – II

Stresses on Piping SystemStresses on Piping System Primary Stresses: Axial stress, Primary Stresses: Axial stress,

Longitudinal stress due to internal Longitudinal stress due to internal pressure, Bending stress due to pressure, Bending stress due to Uniform/Concentrated loading, Hoop Uniform/Concentrated loading, Hoop stress, Shear stress etc.stress, Shear stress etc.

Secondary Stresses: Thermal Expansion Secondary Stresses: Thermal Expansion stress, stress due to Vibration, Fatigue stress, stress due to Vibration, Fatigue stress due to long cycles, Time dependent stress due to long cycles, Time dependent stress like Creep etc.stress like Creep etc.

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Pipe Stress Analysis– IIIPipe Stress Analysis– III

What are Stressed on Stress AnalysisWhat are Stressed on Stress Analysis

Complying with Governing Codes.Complying with Governing Codes.

Safety for Connected Equipment & Safety for Connected Equipment & Supporting Structures.Supporting Structures.

Acceptability of Piping Displacement.Acceptability of Piping Displacement.

Stability of Piping system under Dynamic Stability of Piping system under Dynamic Loads.Loads.

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Pipe stress Analysis - IVPipe stress Analysis - IV

The Governing CodesThe Governing Codes ASME B31.1: Power Piping CodeASME B31.1: Power Piping Code ASME B31.3: Process piping CodeASME B31.3: Process piping Code ASME B31.4: Oil Transportation Piping ASME B31.4: Oil Transportation Piping

CodeCode ASME B31.8: Gas Transportation Piping ASME B31.8: Gas Transportation Piping

CodeCodeThere are Standards like ASTM, API, NEMA, EJMA There are Standards like ASTM, API, NEMA, EJMA

etc.etc.(Not Exhaustive)(Not Exhaustive)

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Pipe Stress Analysis - VPipe Stress Analysis - V

HoHow Things Are Carried Outw Things Are Carried Out Inputs:Inputs:

~ Process: P&ID & LDT (Through ~ Process: P&ID & LDT (Through PDS).PDS).

~ Layout Group: Isometrics.~ Layout Group: Isometrics.~ Mechanical: Equipment GA & ~ Mechanical: Equipment GA &

datasheets.datasheets.~ Civil: Soil Characteristics~ Civil: Soil Characteristics

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Pipe Stress Analysis– VPipe Stress Analysis– V

HoHow Things Are Carried Outw Things Are Carried Out

Processing:Processing:~Modeling~Modeling~Simulating the actual behavior.~Simulating the actual behavior.~Computing results using a Core ~Computing results using a Core

Solver of Simulating S/w CAESAR-II, 4.5v, a Solver of Simulating S/w CAESAR-II, 4.5v, a product of COADE, INC, USA.product of COADE, INC, USA.

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Pipe Stress Analysis– VPipe Stress Analysis– V

HoHow Things Are Carried Outw Things Are Carried Out Output:Output:

~Interpretation of Computer generated ~Interpretation of Computer generated output.output.~Flexibility Considerations~Flexibility Considerations~Load & Displacement consideration at ~Load & Displacement consideration at nozzles & supports.nozzles & supports. In all Operating, Upset & Occasional cases.In all Operating, Upset & Occasional cases.

Formal Stress Analysis Report generation & Formal Stress Analysis Report generation & submissionsubmission..

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Pipe Stress Analysis – VPipe Stress Analysis – V

How Things Are Carried OutHow Things Are Carried OutGeneral Contents of Formal Stress Analysis General Contents of Formal Stress Analysis

Report:Report: SATS Front Sheet, Title Sheets (Design Basis)SATS Front Sheet, Title Sheets (Design Basis) Stress Check List – I & IIStress Check List – I & II Load Summary Chart & Restraint ReportLoad Summary Chart & Restraint Report Displacement Report, Hanger ReportDisplacement Report, Hanger Report Hanger Datasheets, Special Pipe Support reportsHanger Datasheets, Special Pipe Support reports Caesar Dump, Marked up IsometricsCaesar Dump, Marked up Isometrics Equipment G/A drawing & DatasheetsEquipment G/A drawing & Datasheets P&ID, LDT.P&ID, LDT.

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Stress Team Interactions with Other Departments - VIStress Team Interactions with Other Departments - VI

Piping Team

Process Dept.

Stress AnalysisTeam

Stress AnalysisReport

Civil Dept. MechanicalDept.

Site/ Field

InstrumentationDept.

P&IDLDT

SoilCharacteristics

Civil andStructural

Support loadings

Supports Loadingsfor pipe support

selection, pipedisplacements at

operating temp.SAQ,

alongwithStress

Isometricsand other

data

EquipmentG.A.'s

Cleat Loads, Nozzleloads if more than

allowables

Fabricationand Erection

Isometric

Spring, SPS,Specials datasheets, Site problemresolutions, AuditReports

Instrument data

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Pipe Stress Analysis– VIIPipe Stress Analysis– VII

Few Technical AspectsFew Technical Aspects

Flexibility Vs. Rigidity of a Piping system.Flexibility Vs. Rigidity of a Piping system. Expansion Loops, expansion joints etc.Expansion Loops, expansion joints etc. Hanger Supports, Supports from Structures Hanger Supports, Supports from Structures

& equipments.& equipments. Pipe Guides, Line Stops, Anchors etcPipe Guides, Line Stops, Anchors etc TrunionTrunion..

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Pipe Stress Analysis– VIIIPipe Stress Analysis– VIII Roles Roles of The Analystof The Analyst

Carrying out the Analysis, releasing Report, Carrying out the Analysis, releasing Report, carrying out proper documentation for the carrying out proper documentation for the analysis.analysis.

Transferring the load values to Piping layout Transferring the load values to Piping layout Designer for passing on to other dept.Designer for passing on to other dept.

Storing the final stress reports, any other Storing the final stress reports, any other reference calculations, audit files, Caesar soft reference calculations, audit files, Caesar soft copies at proper locations and retrieving the latest copies at proper locations and retrieving the latest files as & when needed.files as & when needed.

Issuing & storing drawings & datasheets of spring, Issuing & storing drawings & datasheets of spring, SPS, snubbers etc.SPS, snubbers etc.

NOTE: This is a general simplified list. For actual NOTE: This is a general simplified list. For actual details refer to the various PL series of documents details refer to the various PL series of documents as listed belowas listed below..

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Associated Instructions & Associated Instructions & Design Guides/ SpecificationsDesign Guides/ Specifications

P-SS-PL-001:Piping Material Spec.P-SS-PL-001:Piping Material Spec.P-SS-PL-093:Stress Analysis Work Procedures.P-SS-PL-093:Stress Analysis Work Procedures.P-SS-PL-003:Piping Design & Plant Layout.P-SS-PL-003:Piping Design & Plant Layout.P-SS-PL-008:Pipe Stress Analysis.P-SS-PL-008:Pipe Stress Analysis.P-PS-PL-009:Pipe Stress Critical line List.P-PS-PL-009:Pipe Stress Critical line List.P-SS-PL-015:Pipe Supports.P-SS-PL-015:Pipe Supports.P-EP-PL-060:Documentation Procedure for P-EP-PL-060:Documentation Procedure for Springs, SPS, Snubbers etc.Springs, SPS, Snubbers etc.P-EP-PL-087/88:Support/Spring Audit P-EP-PL-087/88:Support/Spring Audit Procedure.Procedure.

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Conclusion

Summary.

Benefits to the Organization

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“ “ Thank You Very Much”Thank You Very Much”

……Welcome to Your Queries !!Welcome to Your Queries !!

For any further queries:For any further queries: bhaskaram_gangopadhyay@ril.combhaskaram_gangopadhyay@ril.com 0288-30109510288-3010951

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Fillet weldto high temperature line

Effect of Temperature gradient: Differential thermal growth at top & bottom of saddle causing tremendous shear force on the weld. In long term crack is obvious to generate & propagate to the extent of failure.

At ambient temperature

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