What’s New in the ASME Code 2013 Edition - Xsystem Ltda · PDF fileThere are a number of...

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What’s New in the ASME Code 2013 Edition and API 650 12th Edition

By : Luis Sanjuan

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ASME VIII

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ASME Section VIII is now on a 2 year distribution cycle (Just like the piping Codes B31.3 etc)

There is periodic publication of errata in pdf format Prior to 2013 the Code was re-published every 3 years and there was

a yearly addenda This creates difficulty as there are a lot of potential Code changes that

might affect PV Elite These changes must be incorporated in the software in a relatively

short period of time

ASME Code Distribution Schedule

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Changes that affect PV Elite and CodeCalc Changes to formulas Changes to methodology Changes to material properties (allowable stresses etc)

Formatting changes to the Code itself. For Example:

Types of Changes

Subparagraph Breakdowns/Nested Lists Hierarchy• First-level breakdowns are designated as (a), (b), (c), etc., as in the past.• Second-level breakdowns are designated as (1), (2), (3), etc., as in the past.• Third-level breakdowns are now designated as (-a), (-b), (-c), etc.• Fourth-level breakdowns are now designated as (-1), (-2), (-3), etc.• Fifth-level breakdowns are now designated as (+a), (+b), (+c), etc.• Sixth-level breakdowns are now designated as (+1), (+2), etc.

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Changes to Table U-3 (None that affect PV Elite 2014)

Code Changes

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Figure UCS 66M seems to have been expanded and now includes duplicate information for UCS-66 MDMT curve determination for materials

Code Changes

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There are a number of items changed in Mandatory Part UHX (which is the design of exchanger tubesheets)

Code Changes

Let’s discuss the changes to UHX

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Tubesheet Extension required thickness

Code Changes to Part UHX

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New ‘precautions’

(g) The design rules in UHX-12, UHX-13, and UHX-14 are based on a fully assembled heat exchanger. If pressure is to be applied to a partially assembled heat exchanger having a Configuration d tubesheet that is extended for bolting, special consideration, in addition to the rules given in UHX-9, UHX-12, UHX-13, and UHX-14, shall be given to ensure that the tubesheet is not overstressed for the condition considered.

This is an important warning to keep exchanger tubesheets from bending during hydrotest conditions.

Code Changes to Part UHX

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Nomenclature in UHX-12.3 pertaining to U-Tube exchangers Ps d ,max = maximum shell-side design pressure Ps d ,min = minimum shell-side design pressure (negative if vacuum is

specified, otherwise zero) Pt d ,max = maximum tube-side design pressure Pt d ,min = minimum tube-side design pressure (negative if vacuum is

specified, otherwise zero) These pressures are used to determine Ps and Pt

Code Changes to UHX

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Ps d ,max = maximum shell-side design pressure Ps d ,min = minimum shell-side design pressure (negative

if vacuum is specified, otherwise zero) Psox = shell-side operating pressure for operating

condition x (positive, negative, or zero operating pressure) Pt d ,max = maximum tube-side design pressure Pt d ,min = minimum tube-side design pressure (negative

if vacuum is specified, otherwise zero) Ptox = tube-side operating pressure for operating

condition x (positive, negative, or zero operating pressure)

Code Changes to UHX (fixed rules)

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Ts,mx = Shell axial mean metal temperature for operating condition x, as applicable

Tt = tube design temperature for the design condition or operating metal temperature for operating condition x, as applicable [see UHX-13.4(b)]

Tt,mx = Tube axial mean metal temperature for operating condition x, as applicable

Ts,m = mean shell metal temperature along shell length Tt,m = mean tube metal temperature along tube length

Code Changes to UHX (fixed rules)

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Why the nomenclature changes?

The wording in VIII-1 and VII-2 state to use only one set of arbitrary pressure and thermal load cases for loading cases 4-7. The new rules eliminate this constraint and replace it with multiple actual pressure-thermal operating conditions.

It is clearer on how to deal with vacuum conditions Multiple load case conditions can more realistically be dealt with including

operating, startup, shutdown etc Examples deleted (PTB-4) Load case 4 & 8 reversed Full Vacuum case both sides – no thermal What is the effect of this change?

A lot less paper

Code Changes to UHX cont.

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Tubesheet Deflection

UHX-13.4(d) The designer shall consider the effect ofdeflections in the tubesheet design, especially when thetubesheet thickness h is less than the tube diameter.

Delete this mandatory paragraph and similar paragraphs in UHX and add cautionary note to UHX-4

NOTE: Tubesheet deflection, especially when the tubesheet thickness is less than the tube diameter, may contribute to tube-to-tubesheet joint leakage; likewise, deflection of a tubesheet or flat bolted cover may result in fluid leakage across a gasketed pass partition plate. Such leakages can be detrimental to the thermal performance of the heat exchanger, and deflection may need to be considered by the designer.

Code Changes to UHX cont.

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Conical reinforcement update for cones attached directly to items that are not cylinders or are short cylinders (Appendix 1-5)

Code Changes Appendix 1

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Conical reinforcement update for cones attached directly to items that are not cylinders or are short cylinder (Appendix 1-8)


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Appendix 26 is for Thin Bellows Expansion Joints This Appendix was brought into line with the latest Edition of

EJMA (Expansion Joint Manufacturer’s Association) Quite a number of changes were required and some new

technology was introduced allowing for other types of designs and more accurate calculations

Bellows are used internally and externally in heat exchangers where differential thermal expansion is a problem

Bellows are also used in piping systems where a bit of extra flexibility is required


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New terms Ld = length from attachment weld to the center of the first convolution for

externally attached bellows Lr = effective reinforcing collar length = Lrt = overall length of reinforcing collar Art = cross-sectional metal area of one reinforcing collar for toroidal bellows

based on overall length Atc = cross-sectional metal area of one tangent collar Ats = cross-sectional metal area of shell based on length Ls Ls = effective shell length = Lsm = minimum required shell length having thickness t rm = mean radius of U-shaped bellows convolution (q/4) Ysm = yield strength multiplier depending upon material εf = bellows forming strain


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New Illustrations


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New/Updated or changed formulas A = cross‐sectional metal area of one convolution

= [2πrm + 2*sqrt([q/2-2rm)2 + [w-2rm}2)ntp


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There were several errata changes implemented in this version Conical Section evaluation The calculation of combined stress intensity was updated for pressure and

wind/earthquake loads

All of the other ‘common items’ in Division 1 that are in Division 2 were updated Exchanger Tubesheets Expansion Joints, etcUnfortunately a couple of publication errors crept into the Code Combined stress (sigma 3) Horizontal Vessel Analysis We will not knowingly apply an incorrect equation in PV Elite

Code Changes Division 2

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Section II Part D contains material data for Section VIII Divisions 1 and 2 that is used by PV Elite.

This includes : Allowable stress data Thermal Expansion data Elasticity data etc

Approximately 100 material lines were updated/added. Both Imperial and Metric databases have been updated.

Code Changes Section II Part D

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U Forms

Several of the U forms were updated with the 2013 edition of the Code. In PV Elite 2014, the new U-5 form will be available.

Code Changes cont.

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Code Updates

Productivity Enhancements

3-D Graphics

Questions

Types of Changes for API

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Changes that affect TANK Changes to formulas Changes to methodology Changes to material properties (allowable stresses etc)

One general comment is that sections that were previously called “Appendix” are now called “Annex.”

Types of Changes for API

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Section 5.2.1.k – This section on wind load has been significantly revised. A “note” is added to this section relating the ASCE-10 LRFD methods to the working stress method.

Table 5.2b – The new code indicates this table has changed. Added new materials S275J0 & S275J2

Section 5.10.2.6 – The equation for the “frangible area” has been corrected: FƔ changed to Fy.

API Code Changes

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Section 5.10.5.2 – The definition of Fa states that the least allowable tensile stress is equal to 0.6*Fy.

Least Allowable Tensile Stress = 0.6 * Least Yield Strength

Different value for participating area for frangible roof

Section 5.11.2.1 – Added a 3rd uplift criteria. Anchor bolts may or may not be required

Section 5.11.2.2 – A new section, with a new criteria, the same as the new 3rd criteria in 5.11.2.1. Already checked by TANK 2013

Code Changes

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Table 5.21b – Formulas added for load cases and bolt yield stress limited to 36000 psi: All constant allowable values replaced as a fraction of Fy. The equation for the “Design Pressure + Wind” & “Design Pressure +

Seismic” has changed (0.4 goes to a “pressure combination factor”, from Section 5.2.2)

The definitions now state that Fy is the minimum yield strength, or 36,000 psi, whichever is less

Appendix E.2.2 – Definition changes: The definition for Ac now includes an equation The definition for Av now includes an equation

Code Changes

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Appendix E.6.1.3 – The definition and limit for Fv has been changed.

Vertical Acceleration parameter (AV) formula changed to 0.47*SDS from

0.14*SDS

Differences in seismic calculations

Difference in maximum design pressure affects anchor bolt calculations

Appendix E.6.1.4 – The last equation (E.6.1.4-6) has been modified.

New formula for combined hoop stress

Difference in hoop stress values

Section E.4.6.1: Criteria changed to S1 < 0.6 from Site Class

Difference in Impulsive Spectral Acceleration Parameter (Ai)

Code Changes

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Appendix E.7.2 – The equation for the height of the sloshing wave has changed to 0.42*D*AF from 0.5*D*AF Difference in wave heights

Appendix F.4.2 – For unanchored tanks

Correction to Pmax calculation may result in user pressure exceeding

maximum, requiring a re-analysis using Section F.7

If anchor bolts are either specified by the user or required, Pmax will not

be calculated and used to limit the design pressure. This may result in

significant changes in anchor bolt requirement and calculations, as well as

failure pressure.

(NOTE: this update is being implemented in 2014 SP1)

Code Changes

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Code Updates

API-653 4th Edition, Addendum 3, November 2013

Software verified to be in compliance

API-2000 6th Edition, November 2009

Software verified to be in compliance

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Productivity Enhancements

Updated User Interface

Added Check for Update option for software updates

Updated Supported Cone Roof Data to include a Structural Database input, which is separate from the tank-specified database input

Revised the software to store the Reload Last File at Startup configuration setting in the registry settings

Updated Help with information for all enhancements and previous software revisions

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3-D Graphics

TANK now has 3-D graphical representation Graphics tools are based on those found in PV Elite

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3-D Graphics

View may be saved in several different formats HTML Page (*.html) TIFF Image File (*.tif) HOOPS Streaming File (*.hsf) Windows BMP (*.bmp) JPEG File (*.jpeg, *.jpg)

Tank may be viewed in Orthographic or Perspective mode

What’s New in the ASME Code 2013 Edition - Xsystem Ltda · PDF fileThere are a number of...

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