What’s New in ASME code Ed. 2010

Mandeep Singh & Ray Delaforce

Intergraph CADWorx & Analysis Solutions

December, 2010

ASME 2010 Ed. Design related Updates

ASME Sec. VIII Div. 1 updates

ASME Sec. II Part D Material updates

ASME Sec. VIII Div. 2 updates

2

App. 1-10 for nozzles

Alternate (to UG-37) procedure for nozzles

More accurate and typically a more economical design

Can allow nozzles to be closer than UG-37 method

Earlier only for “Large” nozzles

Now for all nozzles on Cylinders & Cones

ASME Div. 1 Code Updates

3

Nozzle Design Options

Regular nozzle

– Internal Pressure

UG-37 (Area Replacement) + Weld Strength per UG-41.1

Or

Appendix1-10 + Welds per Div. 2 per 4.5.14

“Large” Nozzle – nozzles > 40in on 60in dia. Cylinder/Cone

– Appendix 1-7 (no internal projection)

Or

– Appendix 1-10

Appendix1-10 does not address External pressure case

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Nozzle Design Options in PV Elite

5

Here is how to set it

ASME Div. 1 Code Updates

6

Flanges – bolt spacing factor

To limit leakage between bolts

(in circumferential direction)

Penalty factor which increases flange moments

Still using TEMA bolt spacing for TEMA exchangers

ASME Div. 1 Code Updates

New requirement for the Hydrotest – UG-99(b)

UG-99(b) says generally stress @ hydrotest is increased by 1.3 times

Bolting is normally exempted the increase- Except

Except in the case where 1.3 x Sa/Sb exceed 90% yield.

ASME Div. 1 Code Updates

8

Minimum neck thickness for manway / opening

• New in 2010 Edition

• Increase of the wall thickness already in PV Elite

• But, less severe than a process nozzle.

9

ASME Div. 1 Code Updates

There are changes in required nozzle wall thickness – UG-45

Formerly a calculation was required - Now there is a table instead

The Tubesheet – Shell/Channel Joint

HOT FLUID

ASSUME SHELL SIDE IS HOT SIDE

SHELL WANTS TO GROW (THERMAL)

BUT IS RESTRAINED HERE

SO WHAT HAPPENS ?

10

Tubesheet to shell junction is a Critical stress point.

This is what happens

11

Elastic-Plastic Analysis for Floating Exchangers

Shell

Allow small plastic yielding, allowable is

approximately 3*S

after plastic iteration

But, Tubesheet may

become thicker

12

Very useful when tubesheet is ok but junction is overstressed.

( for Pressure cases )

Material Properties Changes

Section II Part D Material properties

– Material Allowable Database completely re-done

– Yield strength

– Young’s Modulus etc.

13

New “Metric” Material Database

Imperial Internal Database

Converted from Imperial to user units 20,000 psi = 137.90 MPa v/s 138 MPa

Difference is insignificant

Acceptable per ASME Div. 1 GG-1

But not per some inspectors

Solution : New “Metric” database

It will be possible to choose between

native “Metric” database

or

Imperial to Metric database.

To select one

14

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ASME Sec. VIII Div. 2 Changes

ASME Div. 2 changes

– Conical transition

– Lots of formulae/table changes

– Benchmarked cone-cylinder with ASME PTB-3

– Flange spacing factor similar to Div. 1

– Heat Exchanger changes to Div. 1

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EN13445 – European code

EN13445 2009 Update

– welded flat heads

– nozzles

– tubesheet flanged extensions

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Fixed and Floating Tubesheet Exchanger Analysis

Floating head and floating head flange analysis

Expanded EN HX. Functionality

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Thank You!

Questions?