What s New in the ASME Code 2013 Edition and API th Edition. By : Luis Sanjuan

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Augustus Lambert Fleming
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1 What s New in the ASME Code 2013 Edition and API th Edition By : Luis Sanjuan

2 ASME VIII

3 ASME Code Distribution Schedule 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

4 Types of Changes 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: 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.

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

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

7 Code Changes There are a number of items changed in Mandatory Part UHX (which is the design of exchanger tubesheets) Let s discuss the changes to UHX

8 Code Changes to Part UHX Tubesheet Extension required thickness

9 Code Changes to Part UHX 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.

10 Code Changes to UHX 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

11 Code Changes to UHX (fixed rules) 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) Ts,mx = Shell axial mean metal temperature for operating condition x, as applicable Tt = tube design temperature for the design condition or operating metal

12 Code Changes to UHX (fixed rules) 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 cont. 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.

13 Code Changes to UHX cont. 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 pressurethermal 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

14 Code Changes to UHX cont. Tubesheet Deflection UHX-13.4(d) The designer shall consider the effect of deflections in the tubesheet design, especially when the tubesheet 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.

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

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

Code Changes Appendix 26 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

17 Code Changes Appendix 26 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

18 Code Changes Appendix 26 New terms L d = length from attachment weld to the center of the first convolution for externally attached bellows L r = effective reinforcing collar length = L rt = overall length of reinforcing collar A rt = cross-sectional metal area of one reinforcing collar for toroidal bellows based on overall length A tc = cross-sectional metal area of one tangent collar A ts = cross-sectional metal area of shell based on length Ls L s = effective shell length = L sm = minimum required shell length having thickness t r m = mean radius of U-shaped bellows convolution (q/4) Y sm = yield strength multiplier depending upon material ε f = bellows forming strain

19 Code Changes Appendix 26 New Illustrations

20 Code Changes Appendix 26 New Illustrations

21 Code Changes Appendix 26 New/Updated or changed formulas A = cross sectional metal area of one convolution = [2πr m + 2*sqrt([q/2-2r m )2 + [w-2r m }2)nt p

22 Code Changes Division 2 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, etc Unfortunately 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

23 Code Changes Section II Part D 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.

24 Code Changes cont. 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.

25 Types of Changes for API Code Updates Productivity Enhancements 3-D Graphics Questions

26 Types of Changes for API 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.

27 API Code Changes Section 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 The equation for the frangible area has been corrected: FƔ changed to Fy.

28 Code Changes Section 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 Added a 3 rd uplift criteria. Anchor bolts may or may not be required Section A new section, with a new criteria, the same as the new 3 rd criteria in Already checked by TANK 2013

29 Code Changes Table 5.21b Formulas added for load cases and bolt yield stress limited to 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

30 Code Changes Appendix E 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 The last equation (E ) 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)

31 Code Changes 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)

32 Code Updates API-653 4th Edition, Addendum 3, November 2013 Software verified to be in compliance API th Edition, November 2009 Software verified to be in compliance

33 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

34 3-D Graphics TANK now has 3-D graphical representation Graphics tools are based on those found in PV Elite

35 3-D Graphics View may be made transparent to reveal internal elements

36 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

37 3-D Graphics Dynamically calculated elements are added to view after the job has been analyzed

38 3-D Graphics User can select which elements to view

39 3-D Graphics User can view element details by holding down control key

40 3-D Graphics User can select color properties for elements

41 ASME & API Code Changes Thanks for your attendance!

VVD - Visual Vessel Design. Read Me File

VVD - Visual Vessel Design. Read Me File VVD - Visual Vessel Design Version 16.0 (2016) Read Me File Version 16.0 (2016) Updates to latest code amendment Version 16.0 includes a number of improvements and additions. This version is also in compliance