What’s New in ASME code Ed. 2010 - · PDF fileWhat’s New in ASME code Ed. 2010...
Transcript of What’s New in ASME code Ed. 2010 - · PDF fileWhat’s New in ASME code Ed. 2010...
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
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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
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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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ASME Div. 1 Code Updates
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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
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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.
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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 ?
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Elastic-Plastic Analysis for Floating Exchangers
Shell
Allow small plastic yielding, allowable is
approximately 3*S
after plastic iteration
But, Tubesheet may
become thicker
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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.
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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
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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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