FEA Tools

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FEA Tools –Tee Flexibility Effect onNozzle Moments

Nagarajan S Application Engineer

ImageGrafix Engineering Services Pvt Ltd

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Introduction

How to do

Benefits

2

Agenda

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Modified Sustained stress equation in 2010 Edition

3

Introduction

B31.3 2008 B31.3 2010

+

+ 2

-

2

-

-

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Modified expansion stress equation in 2012 Edition:

4

Introduction

B31.3 2010 B31.3 2012

SE 4

4

St / 2Z / 2Z

Sa - Fa / Am

Sb ( [

]) / Z ( [

]) / Z

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Modified Expansion and Sustained Stress

Equation

=

+

=

+

= ℎ

= ℎ

5

Introduction

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Question

What is a flexibility factor ,or “k-factor”?

AnswerA flexibility is a coefficient

that predicts the flexibilityof a component/intersection,i.e. how much that intersection or component will be

displaced (move) when a known external force is applied

FEA is one of the best ways to calculate accurate k-factors

PRG’s FEA technology computes the k-factors quickly andverifies them through physical testing

6

Introduction

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To meet B31.3 – 2012 Edition – One need to perform FEAAnalysis to find out the SIF’s factor such as ia & it andthen all the SSI’s factor such as Ii, Io, Ia & It.

FEA TOOLS is the software helps you to find the SIF’s &SSI’s value by FEA Method and implement the same intoCAESAR II automatically

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Introduction

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There are a number of interesting features in CAESAR II V.7.0

and FEA Tools V.2.0, but the most important remains theaccurate calculation of the stresses.

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How to do

V.7.0 V.6.1 V.5.3

Eight Stiffness

factors has to

be entered

4 – SIF’s

4 – SSI’s

Only Four

Stiffness factors

has to be

entered

2 – SIF’s

2 – SSI’s

Only Two

Stiffness factors

has to be

entered

2 – SIF’s

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Click to edit Master title styleHow to do

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Stress Terms

SIF’s & SSI’s

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Applying TEE Flexibility – B31 Currently

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How to do

Three Piping Elements framing

into a Single Node

“Flexibility Factor” = 1

SIF applied at Centreline of Intersection

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B

A

Applying Tee Flexibility – ASME 07-02 TEE (NewApproach)

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How to do

Node added where

branch pipe meets run

wall “B”. “A” to “B” is a

stiff connection.

Flexibility:

• Applied at “B” and both sides of “A”

Stress:

• If d/D>0.5, moments and stresses

calculated at “A”• If d/D <0.5, moments & stresses are

calculated at “A” & “B”

Represents a CAESAR II

Node/CNode pair with stiffness

0

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– FEA Tools™ 2015

– To automatically update all B31 tees with the ASME 07-02 stiffness and SIF

values

– This program also includes an FEA processor to provide exact terms for

your specific intersections

CAESAR II

Create

“Regular”

Model

FEA Tools

Update data

set with ASME

07-02 term

CAESAR II

Analyse

Updated

Model

JOB.C2 JOB-0702.C2

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How to do

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Click to edit Master title styleCAESAR II Model Conversion Options

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B31.3 provided stress analysis report for an example. (PumpDischarge)

This example shows an over-turning Moments on Pump NozzleFlange.

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How to do

Input Parameters (English.FIL)

PumpDischarge

Un-Reinforced

Tee

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Click to edit Master title styleHow to do

15

Example file Pump Discharge – Tee Flexibility

Locate .C2 file

Specify

Output file

Specify Translation

Option

Click “CONVERT”

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This model now has

updated:o SIFs

o Ks

o Nodes

o Restraints

Analyze the updated

model

We open the translated model in CAESAR II using 07-02 option

How to do

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Let’s Go

Live Now

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The added tee flexibility has reduced the Overturning Momentson Pump Flange Nozzle

The updated SIFs are applied too

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Benefits

MomentsBefore ASME

07-02After ASME

07-02Reduction

Value

MX 20979.1 ft-lb 16814.5 ft-lb 4164.6 ft-lb

MY 33880.7 ft-lb 18229.9 ft-lb 15650.8 ft-lb

MZ 105701.1 ft-lb 71542.1 ft-lb 34159 ft-lb

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See PRG I k

Large k factors applyto the tee branch andrun pipes

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Benefits

The Reason for the DramaticChange?

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FEATools has 2 options for computing SIF and k’s

Pure FEA of the intersectionsUsing correlated equations based on FEA data – ASME 07-02

(in development)

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Benefits

Moments

Original

CAESAR II

model

Translated

model with

07-02 data

% Reduction

Translated

model with

FEA data

% Reduction

MX 20979.1 ft-lb 16814.5 ft-lb4164.6 ft-lb

16415.1 ft-lb4564 ft-lb

20 % 22 %

MY 33880.7 ft-lb 18229.9 ft-lb15650.8 ft-lb

17258.9 ft-lb16621.8 ft-lb

46 % 49 %

MZ 105701.1 ft-lb 71542.1 ft-lb34159 ft-lb

69136.8 ft-lb36564.3 ft-lb

32 % 35 %

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FEA Tools helps us to find the accurate SIF (i) factorand SSI (I) factor and Flexibility (k) factor

Implement the SIF & SSI factor into CAESAR IIModel to meet the B31.3 Edition 2012 Code

requirements.

With this Implement, it helps to reduce the Stress,Loads and better Support & Hanger Selection onyour systems.

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Benefits

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Questions

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Documents

FEA Tools