Codeware | COMPRESS Division 2 Change List

ASME B16.5/B16.47 MDMT rating
When impact tested material per UG-84 is specified for an ASME B16.5\B16.47 flange, the MDMT rating is now determined as the lower of the impact test temperature specified per the material specification or the rated MDMT determined per the Code rules (e.g. UCS-66 rules). [616]

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Bug Fixes

Thickness Summary - Governing load
In rating mode for cylinders, cones, and hemispherical heads, the governing load was reported as Unknown in the Thickness Summary. In addition, the governing loading listed in the detailed component reports under the section Results Summary was not always correct. [634]

Opening is Exempt from Reinforcement per AD-510 option switch
When the option switch Opening is Exempt from Reinforcement per AD-510 was active, an internal error prevented the nozzle calculation from executing resulting in a blank nozzle report and zero maximum pressure values. This issue was present in Builds 6253 and after. [618]

Thickness Summary - Welded covers
The required thickness and governing load condition for welded covers are now reported correctly in the Thickness Summary. [633]

AD-550 Delta Temperature
The temperature range used for AD-550(f) now uses 70°F or 20°C as the reference temperature instead of the vessel's test temperature. [635]

AM-218 reference reporting error
For Appendix 3 flanges, the MDMT note in the detailed report and in the Pressure Summary incorrectly referenced UCS-66(i) instead of AM-218.4(g). [622]

Appendix 3 Flange - AM-218 reference error
For Appendix 3 flanges, the MDMT note in the detailed report and in the Pressure Summary incorrectly referenced UCS-66(b)(1) instead of AM-218.3(b). [619]

Bolted cover dialog switch
The option switch Increase t for reinforcement per UG-39(d) has been removed as it does not apply to Division 2. [617]

COMPRESS locks up when using a user defined metric thickness increment
For metric units when a user defined thickness increment for plate was input as a non-integer value, it was possible for COMPRESS to lock-up when designing a cylinder. In addition, the plate thickness selected was not assigned properly based on the non-integer increment. [644]

Nozzle attached to nozzle
For a nozzle attached to another nozzle, the following calculations were not performed when applicable: hydrotest stress, WRC-107 local stresses, and AM-218.3 stress ratio when vessel applied stress ratio is used per ASME Interpretation VIII-1-01-37. [627]

Nozzle detailed report - AD-550(f) check
For metric units, the detailed nozzle report for the AD-550(f) available reinforcement check did not properly convert the thermal expansion coefficients to mm/mm/°C and the delta temperature listed was not converted properly. The final result was correct. [621]

Nozzle hydrotest stress
The nozzle hydrotest stress calculation was incorrectly performed using the nozzle outer diameter when the AD-550 Metal Available for Reinforcement check failed. This resulted in an overly conservative hydrotest stress. [626]

Required area, A_r when AD-550 check fails
When the nozzle neck material is not available for reinforcement per AD-550(f), the diameter used for the required area calculation was erroneously set to zero resulting in a required area (A_r) equal to zero. [636]

Vacuum Summary Length Le for transitions
The Length Le for transitions was not reported in the vacuum summary. The report showed N/A. The longest unsupported length for the transition is now reported in the vacuum summary. [630]

Vortex shedding bending moment
The bending moment in the longitudinal calculations for vortex shedding conditions was incorrectly using the bending moment from the operating condition. [614]

WRC-107 pressure stress intensity factor
The pressure stress intensity factor (I) derived from the PVP- Vol. 399 is now based on the nominal corroded nozzle thickness. Previously, the minimum corroded nozzle thickness was used which includes the reduction of the pipe tolerance when applicable. [625]

WRC-107 tabulated stress results
Corrections have been made to the tabulated stress results in the table Stresses per WRC Bulletin 107. An internal error resulted in incorrect values for some of these stresses. The final stress results, maximum combined stress and maximum local primary membrane stress, were still correct. This was an issue with Build 6253 and after. [624]

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Build 6255 changes

New Features

Code Case 2575 applied for 2007 Edition
Code Case 2575 is automatically applied for the 2007 Edition of ASME Division 2 designs. Once the new 2007 Edition Division 2 rules have been fully implemented into COMPRESS, this Code Case will become optional. [610]

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Bug Fixes

AD-520 required area - Nozzle in flat head
For nozzles in flat welded or bolted covers, the nozzle corrosion allowance was not properly accounted for in the AD-520 required area calculation. [611]

Build 6253 changes

New Features

ASME A-1, A-2, and A-3 forms
The ASME A-1, A-2, and A-3 forms are now available. This new feature supports the National Board's EDT (Electronic Data Transmission) facility allowing you to submit forms to the National Board electronically saving both time and money. Additionally, COMPRESS generated ASME forms may be archived using the built in forms database management utility. The COMPRESS forms management utility supports network access and can be used to store all forms and necessary support files as well as generate a National Board Log. The COMPRESS forms capability is accessed from the new Forms option located on the COMPRESS Main Menu. [600]
Nozzle attached to nozzle
For a nozzle attached to another nozzle, the report text echoing the location of the nozzle's position has been changed to clarify the input. The text now reads Nozzle center line offset to face of parent nozzle. [594]
Nozzle detailed report -Location description
In the detailed nozzle report, the text descriptions used to describe the position of nozzles on heads or parallel nozzles on cones have been improved to clarify the inputs. [601]

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Bug Fixes

MDMT rating deficiency
For components specified with impact tested material, a deficiency was incorrectly reported if the impact test temperature specified was warmer than the design MDMT but the Figure AM-218.3 reduction reduced the rated MDMT to below the design MDMT (see AM-218.4(g)). [607]
Nozzle dialog - Calculated values
If a nozzle is edited and the cancel option is utilized to exit the dialog, subsequent editing of the nozzle resulted in zero or undefined results (A_r, A_a etc) in the details box. This was a problem for nozzles located on bolted covers only. [603]
Nozzle MDMT reporting issue
A reporting error has been corrected in the nozzle report for the MDMT of the nozzle. This reporting error occurred in the Nozzle assembly MDMT area of the report and did not affect the overall nozzle assembly MDMT rating. [598]
Nozzle on nozzle calculation error
For a nozzle on nozzle calculation when the parent nozzle component is attached to a main vessel component with an outer corrosion allowance specified, the main vessel component's outer corrosion allowance was incorrectly assigned to the parent nozzle component. This resulted in a maximum pressure rating less than the design pressure. [596]
Program crash - Cone ring on seam
A program crash has been corrected that could occur when a vacuum ring was located exactly on the seam of a transition [436]

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Build 6252 changes

New Features

ASME Section VIII, Division 2 2006 Addenda
COMPRESS has been updated to include the 2006 Addenda of the ASME Code. The following additions and changes were made to COMPRESS:

(1) The materials database now includes all applicable ASME Section II, Part D 2006 Addenda data for both Customary and Metric editions. This includes all materials from Tables 2A, 2B and 3. In addition, Table U (tensile strength), Table Y-1 (yield strength), Tables TE-1 through TE-5 (thermal expansion coefficients), Tables TM-1 through TM-5 (elastic moduli) and all vacuum charts have been updated. A change in philosophy has been made concerning how Tables TE-1 through TE-5, TM-1 through TM-5, and vacuum charts are maintained. Starting with the A06 addenda, these charts will be maintained on an Addenda basis. Previously, all changes were retroactive (i.e. most recent data was used for previous Addendas).

(2) Table AG-150.1: ASME B16.5 2003 Pipe Flanges and Flange Fittings is now used for designs with A06 Addenda or later. All pressure-temperature ratings and material groups have been updated to reflect the 2003 Edition.

(3) VIII-1 Appendix 2-1(a): In ASME Section VIII Division 1, a mandatory statement is now present that requires the hub thickness of weld neck flanges to meet the minimum thickness requirements in Sub-section A. This check has been added to the COMPRESS Division 2 module as well. Although a mandatory statement is not present in VIII-2 Appendix 3, it is our belief that the Code's intent is that the flange hub meet the requirements for a cylinder. As such, hubs on weld neck flanges are now calculated as cylinders. The design thickness is presented in the dialog and enforced while in the design mode. The maximum pressure capabilities of the hub are listed in the Pressure Summary and detailed hub calculations are presented at the end of the Appendix 3 flange report.

(4) Appendix 28: A new mandatory appendix provides additional requirements for the use of high silicon stainless steel materials. The following changes have been implemented in COMPRESS:

- The minimum design metal temperature is limited to -50°F and warmer.

- For S30601 materials, a deficiency is reported if the maximum thickness of the material at the weld exceeds 1 in. (25 mm). [588]

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Bug Fixes

Code Case 2286 - Blank report
A calculation error has been corrected that resulted in a blank component report when utilizing Code Case 2286 for external pressure design. [589]
CS-3 Metric vacuum chart
For a metric vessel with a material assigned to the CS-3 vacuum chart per ASME II-D Metric, a problem has been corrected where an erroneous message was displayed (e.g. Temperature coincident with external pressure > maximum vacuum chart temperature). This error occurred when allowable compressive stress values were required for the longitudinal check, the internal pressure design temperature exceed the 150°C limitation listed in CS-3, and the external pressure design temperature was input less than 150°C. [590]
Nozzle combined loading check reporting error
In the Stress in the nozzle wall due to internal pressure + external loads check when hot shut down governed and metric units were selected, the metric stress result in parenthesis was incorrectly reported as the condition coincident with pressure. In addition, two conclusion statements were reported which appeared contradictory (one for pressure plus external loads and one for hot shut down condition). Now, if hot shut down governs, the conclusion statement for the hot shut down check is only reported. [591]
Stress in nozzle wall due to external pressure and external loads
In the nozzle wall check for pressure plus external loads when both internal and external pressure are specified, the external pressure plus external loads case, when governing, was not calculated and reported. [592]

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Build 6250 changes

New Features

Intermediate skirt supports now available for Division 2 vessels
The intermediate skirt support option has been enabled for VIII-2 vessels. Previously, intermediate skirts were available only for VIII-1 vessels. [575]
Metric equivalents
The metric equivalent values listed throughout Section VIII, Division 2 have been incorporated into COMPRESS. Note that the COMPRESS materials database was previously extended to include the II-D metric values for both the 2004 Edition and 2005 Addenda. Differences between the Metric and U.S Customary II-D editions as well as the metric requirements of various VIII-2 Code paragraphs mean that different results will now be obtained for the same vessel when switching between systems of units in COMPRESS. These typically result from material temperature limitations, allowable stresses and AM-213 thickness requirements that vary slightly between the Metric and U.S. Customary editions of the Code. [573]
Deficiency reported when saddle included angles is less than 120 degrees
COMPRESS now reports a deficiency if the user specifies a saddle contact angle smaller than 120 degrees. ASME VIII-2 AD-940(d) states that saddle supports must "afford bearing to extend over at least one-third of the shell circumference." [576]
Seismic vertical acceleration
Consideration of seismic vertical acceleration is now present for all applicable Division 2 calculations. [586]

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Bug Fixes

AD-203 cone reporting error
For conical sections in vertical vessels, a reporting error has been corrected in the AD-203(b) & (c) longitudinal check for the meridional membrane force (F) term. The cone inner radius (R) was incorrectly substituted for the cone mean radius (R_m) in the detailed report. This reporting error did not affect the calculation performed. [574]
AD-212 Minimum integral reinforcement length calculation
The calculated minimum length of the thickened cylinder and cone sections at the cone small end juncture now uses the required thickness at the cone juncture (t_r). Previously, the minimum lengths were conservatively using the nominal integral reinforcement thickness. [543]
AD-540 Limits of reinforcement
A calculation error has been corrected in the determination of the AD-540 limits of reinforcement for Type 9 and Type 10 nozzles when a user specified local vessel thickness was used. Although the nozzle detailed report reflected the input local vessel thickness, the final results were determined using the actual vessel thickness. [587]
AM-218.4(g) - units reporting error
The AM-218.4(g) temperature reduction reported for the case of metric units used the formula °C = (°F-32)/1.8 instead of °C = °F/1.8 as required. This was a reporting issue only and did not affect the MDMT calculated. [585]
Erroneous AD-602 deficiency
A tolerance issue caused an erroneous nozzle AD-602 deficiency to be reported. The resulting deficiency would be similar to Minimum nozzle thickness of 3.5 in is less than minimum thickness required per AD-602 of 3.5 in. [571]
Integral forgings - nut relief calculation
For integral forgings with a class rating of 400 or above, the raised face height of 0.25" is now considered when determining the nut relief length (NL). For integral forgings specified with a Nut Stop OD, this results in a small decrease the nozzle neck area available. [581]
Nozzle corrosion allowance error
When an outer corrosion default was input in the Set Mode\Defaults dialog, nozzles incorrectly inherited this default value upon creation. This was in addition to any nozzle internal corrosion input locally in the nozzle dialog. Since there is no input for outer corrosion allowance in the nozzle dialog, there was no way to remove the default outer corrosion saved in the nozzle. This has been corrected. [583]
Nozzle reporting error
A reporting error has been corrected in the detailed nozzle report for the AD-602 thickness check. In some circumstances, the final result was reported twice (e.g. Available thickness, t_n = 16.6 = 16.6 mm). [570]
Nozzle reporting error - limit of reinforcement normal to the vessel wall
A reporting error has been corrected for the case of a nozzle conforming to Figure AD-540.1 sketch (a) or (b) that is attached to a vessel component where an external corrosion allowance is specified. In this instance, the K factor reported was not reduced by the external corrosion allowance. The final numerical result was correct. [584]
Welded cover minimum weld bevel depths
Corrections have been made to the minimum weld bevel depths (a & b) for welded covers constructed per Figure AD-701.3 sketch (b). Previously, the minimum weld bevel depth a was calculated using t_s - b instead of 2*t_s - b, and the minimum weld bevel depth b was always set to zero. [580]

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Build 6249 changes

New Features

AD-540 Limits of reinforcement - nozzle with locally thickened shell
For the case where additional reinforcement is provided using a local increase in shell thickness, the AD-540 limits of reinforcement calculation now uses the shell thickness removed from the nozzle junction as t and the local increase in shell thickness as t_e. Previously, the total shell thickness at the junction was taken as t and the value t_e was taken as zero. This was based on the assumption that the locally thickened section was wide enough to act as separate shell. [560]
AD-550 and AD-551 checks removed for exempt nozzles
The AD-550 and AD-551 checks are no longer performed for nozzles that are exempt from reinforcement per AD-510. [568]

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Bug Fixes

AD-204 - maximum pressure calculation
The maximum pressure determined for formed heads per AD-204 has been improved. The maximum pressure determined per the curves in Figure AD-204.1 is now used in lieu of the design pressure to determine if the thick head equation should be used. [566]
AD-501(a)(3) - unnecessary deficiency for hillside nozzles
In some cases, the hillside nozzle offset length was not taken into account when checking the nozzle AD-501(a)(3) spacing requirements. This could cause an AD-501(a)(3): Adjacent nozzle error even though the nozzle placement was acceptable. [556]
AD-540 limits of reinforcement - diameter issue
For nozzles designed for external pressure only, the AD-540 parallel limit of reinforcement was incorrectly calculated using the nozzle outer diameter instead of the inner diameter as required. This produced an overly conservative result. A work around was to enter a small internal design pressure. [563]
AD-602(b) - minimum nozzle neck thickness-
COMPRESS now bases the AD-602(b) check for minimum thickness of standard wall pipe on the thin end for type 9 and 10 nozzles. [557]
Appendix 3 flange - UNS number not found error
For Appendix 3 flanges constructed from Table AHA-1 high alloy material the UNS number was not correctly determined. This would sometimes result in a Get_Material_UNS_Number: UNS number not found - internal error message. The UNS number is used in the AM-213(b) impact test exemption temperature check. In previous builds, the possibility existed that an incorrect UNS number assignment could result in an incorrect impact test exemption temperature for cases where AM-213(b)(3) was applicable. [561]
Hillside nozzle chord opening calculation error
For the case of a hillside nozzle where the nozzle material was not available for reinforcement per AD-550, the corroded nozzle chord opening was incorrectly calculated producing an overly conservative result. [564]
Typographical error in cylinder, hemispherical and cone reports
A typographical error has been corrected in the cylinder, hemispherical head, and cone reports for the maximum pressure rating per AD-201© where 10³³ was reported instead of 10³. This was a reporting error only and did not affect the calculations. [559]

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Build 6248 changes

New Features

Internal Codeware Build
COMPRESS Build 6248 was not distributed. It was an internal Codeware build used for testing purposes. [562]

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Build 6247 changes

New Features

ASME Section II, Part D Metric database
COMPRESS now offers a complete AG-151 and AD-130 metric units solution through the inclusion of the Metric Edition of Section II, Part D. The COMPRESS materials database has been extended to include II-D metric values for both the 2004 Edition and 2005 Addenda. This major addition covers materials from Tables 2A, 2B and 3. In addition, Table U (tensile strength), Table Y-1 (yield strength), Tables TE-1 through TE-5 (thermal expansion coefficients), Tables TM-1 through TM-5 (elastic moduli) and all vacuum charts are included. Also, the ASME Materials dialog displays the metric edition of II-D when metric units are selected and the Addenda is set to the 2004 Edition or later.

Please note that the Metric Edition of Section II, Part D is a "hard" metric conversion of the traditional U.S. Customary Edition of Section II, Part D. Differences between the Metric and U.S Customary II-D editions as well as the metric requirements of various VIII-2 Code paragraphs mean that different results will be now obtained for the same vessel when switching between systems of units in COMPRESS. These typically result from material temperature limitations, allowable stresses and AM-213 thickness requirements that vary slightly between the Metric and U.S. Customary editions of the Code. [547]
ASME Section VIII, Division 2 2005 Addenda
COMPRESS has been updated to include the 2005 Addenda of the ASME Code. The following lists the applicable changes:

(1) The COMPRESS materials database has been extended to include all applicable ASME Section II, Part D 2005 Addenda data. This includes all materials from Tables 2A, 2B, and 3. In addition, Table U (tensile strength), Table Y-1 (yield strength), Tables TE-1 through TE-5 (thermal expansion coefficients), Tables TM-1 through TM-5 (elastic moduli) and all vacuum charts have been updated.

(2) Appendix 3-395: Flange rigidity calculations are now mandatory. [548]
Nozzle report
If a nozzle description (e.g. 2" Sch 40) is not available a blank line will no longer be added to the report. [554]

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Bug Fixes

AD-501(a)(3) adjacent nozzle error
When multiple nozzles at the same radial angle were attached to a nozzle, an AD-501(a)(3) adjacent nozzle deficiency was issued even when nozzles were adequately spaced. [513]
AD-501(a)(3) close nozzle check
In some instances, a deficiency was not produced when two nozzles violated the spacing rules of AD-501(a)(3). [546]
AD-551(a) violation and nozzle reinforcement calculations
When the nozzle stress intensity is less than 80% of the vessel stress intensity (see AD-551(a)), the strength reduction factors were not being determined (f_rx = 0). These designs are not actually permitted per AD-551(a). The reinforcement calculations have been corrected and COMPRESS will continue to issue an AD-551(a) violation deficiency. [550]
ASME Interpretation VIII-1-01-37
The status of the ASME Interpretation VIII-1-01-37 option is now reported in the Settings Summary. Also, an error has been corrected in the nozzle report where the option was indicated as active when it was not. In addition, the un-necessary nozzle stress ratio report section is no longer presented when this interpretation is used. [552]
Nozzle reinforcement error when AD-550(f) applies
A correction has been made in the pad area calculation (A₅) for nozzles with non-integral pads where the nozzle neck area (A₂) is not available per AD-550(f). In this circumstance, COMPRESS was not giving credit for the entire reinforcement pad resulting in a total area that was too conservative. [551]
Studding outlet calculation error
For studding outlets, a calculation error has been corrected where the strength reduction factor f_r4 was always being set to one. [555]

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Build 6246 changes

Bug Fixes

AD-501(a)(3) adjacent nozzle check
In some instances, a deficiency was not reported for adjacent nozzles that violated the rules in AD-501(a)(3). [545]

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Build 6243 changes

Bug Fixes

Variable thickness nozzle calculation error
For variable thickness nozzles, such as a heavy barrel connection, only half of the area available in the sloped section was credited. [540]
AD-501(a)(3) adjacent nozzle check
The outside radius was incorrectly used for the AD-501(a)(3) adjacent nozzle spacing check. This could result in an unnecessary nozzle deficiency stating that an Appendix 4 or 5 analysis was required. [532]
F and D head crown radius restriction per AD-204
A correction has been made to apply the AD-204 crown radius restriction to the outer diameter of the head instead of the inner diameter. [542]
Nozzle report - ASME B16.5/B16.47 flanges
For a nozzle with an Appendix 3 flange attached, the report pertaining to ASME B16.47\B16.5 flanges is no longer shown. [539]
PWHT and weld qualification deficiencies
AF-402 PWHT temperature limits and AF-210.4 welding procedure qualification deficiencies have been changed from errors to warnings. [531]
Support lug crash
A crash has been corrected that occurred for certain lug supported vessels during report generation (F3). The crash would occur for lug supports with pads when the required pad fillet weld was greater than the actual pad fillet weld. [536]
Transition AD-201(c) longitudinal compressive loading check
In Build 6242, a deficiency indicating that the longitudinal compressive load check had failed was incorrectly reported. An example of the error message follows:
AD-201(c): Iteration for a required thickness value to satisfy longitudinal compressive loadings failed (t = 5, Sc > Allowable =17728.39, Sc = 185.7691). Send COMPRESS file (*.cw6) to support@codeware.com. [534]
Transition integral reinforcement deficiency
When the ratio of pressure over allowable stress (P/S) was less than 0.002, an erroneous integral reinforcement deficiency was reported even though sufficient integral reinforcement was present. This occurred for both the small and large end integral reinforcement checks. [535]
Transition integral reinforcement design thickness
The transition longitudinal compressive loading check could produce excessive integral juncture reinforcement design thickness values under certain circumstances. This error was isolated to Build 6242 and would only occur when the cone thickness was governed by compressive longitudinal loadings. [537]
Variable thickness nozzles (type 9 and 10)
For variable thickness nozzles (e.g. heavy barrel), the interactive results presented in the dialog were not properly updated when the heavy barrel thickness input was decreased. [538]

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Build 6242 changes

Bug Fixes

Code Case 2261 reporting error
A reporting error has been corrected for heads designed per Code Case 2261. The ratio of r / D was incorrectly reported. This was a reporting error only and did not affect the determination of the factor M used in the calculations. [525]
Cone external pressure reporting issue
For conical sections having intermediate stiffening ring(s) specified with very small unsupported lengths, it was possible that the detailed calculations for this section were not output in the report. This occurred due to the iteration routine's inability to solve for an exact solution. Now, the detailed report is reported with a conservative external design thickness for the cone section in question. [523]
Nozzle calculation lock-up
A correction has been made to prevent an isolated program lock-up in the nozzle calculation. The lock-up would occur in the determination of the parent component's required thickness for the combined loading check in the longitudinal direction. [526]
Nozzle report - Pressure plus external loads govern
In the detailed nozzle report when the parent component's required thickness from AD-520 t_r is governed by the combined load check in the longitudinal direction, the text (pressure plus external loads govern in longitudinal direction) is presented. For the case where the combined load check governed the internal pressure condition but not the external pressure condition (or vice versa), the text was incorrectly reported for both pressure conditions. [522]
Tray reports
An error has been corrected that prevented tray reports from being displayed. [528]
WRC-107 calculation not performed
WRC-107 calculations were not always completed for cases where a non-standard place holder had been specified in the MS Windows regional settings. An example of this would be to specify that Windows use a decimal (.) in place of a comma (,) as the character to use when formatting numbers in an English (United States) locale. This typically affected only certain configurations such as very large vessels. [529]

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Build 6241 changes

Bug Fixes

Cone stiffener elevation
An internal problem with a cone stiffener ring elevation assignment has been corrected that caused COMPRESS to lock-up. [519]
Nozzle report changes
A reporting problem has been corrected where the maximum allowable external pressure (MAEP) in the section title was shown as zero.
The section title font size has been increased to further distinguish the start of a new section. [520]
Offset nozzle report
For nozzles that are offset, the section title in the report now consistently refers to the long or short chord of the nozzle as appropriate. [521]

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Build 6240 changes

Bug Fixes

Nozzle AD-520 and AD-602 calculations
For a nozzle attached to a cylinder or hemispherical head, the required thickness at the point of attachment was not properly considering the pressure plus external loads condition. This affected both the AD-520 reinforcement and AD-602 minimum nozzle neck thickness calculations when the governing shell loading was in the longitudinal plane.

Note: The possibility exists for nozzle designs that are overly conservative as the required thickness in the longitudinal direction is taken at the bottom of the parent component instead of at the point of attachment. An example is a long cylinder with a nozzle at the top of the cylinder. This can be remedied in the COMPRESS model by breaking the long cylinder into shorter sections where the seam falls immediately after the nozzle. In addition, both the operating hot and corroded and operating hot and new conditions are investigated and the larger taken regardless of the condition being analyzed (e.g. Design P, MAWP, or MAP). [514]
Nozzle Summary - Nozzle required thickness reported as zero
A reporting error has been corrected where the nozzle required thicknesses Req tn were reported as zero when in the rating mode when Rate Nozzles For was set to Find Nozzle MAWP. [516]
Nozzle detailed report
If the MAP condition governs the Larger of MAWP or MAP nozzle design mode the detailed nozzle report calculation title now lists the test temperature instead of the operating temperature. A redundant set of nozzle calculations at the MAP has also been removed. [517]
Program crash - User defined plate increment with SI or MKS units
For SI or MKS units when the User defined thickness increment for plate option located on the Set Mode\Options dialog was activated, the program would stop responding when a component was created. [518]

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Build 6239 changes

Bug Fixes

Maximum pressure iteration warning
In the nozzle maximum pressure iteration routine, the warning Iteration stopped (Full Area Check); iteration loop maximum set at 50. (warning) would sometimes appear when not necessary. An additional check is now present that will reduce the frequency of these types of warnings. [515]

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Build 6238 changes

New Features

ASME Section VIII Division 2 2004 Edition
COMPRESS has been updated to include the 2004 Edition of the ASME Code. The following lists the applicable ASME Section VIII Division 2 2004 Edition changes:

(1) The ASME material database has been updated with all relevant ASME Section II Part D 2004 Edition data. This includes all of the relevant materials from Tables 2A, 2B, and 3. In addition, Table U (tensile strength), Table Y-1 (yield strength), Tables TE-1 through TE-5 (thermal expansion coefficients), Tables TM-1 through TM-5 (elastic moduli), and all vacuum charts have been updated.

(2) AD-213(c): Subparagraph deleted that required the thickness of a cylindrical shell attached to a formed head be greater than or equal to the required head thickness for a minimum distance of (R*t)^0.5. The requirements of AD-420 must still be met. [512]

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Bug Fixes

AD-501(a)(3) Distance between centerlines of adjacent nozzles check
The distance between the centerlines of adjacent nozzles per AD-501(a)(3) now accounts for hillside nozzles. Previously, hillside nozzles were not considered correctly causing erroneous Adjacent Nozzle Deficiency deficiencies. A majority of this problem was fixed in build 6235. [438]

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Build 6237 changes

Bug Fixes

Platform wind shear calculations
Platform wind shears determined by the recently implemented ASCE "Wind Loads and Anchor Bolt Design for Petrochemical Facilities" were conservative in some cases and would cause a program crash in other cases. Platforms having an enclosed angle between 90° and 180° resulted in overly conservative platform shears. For platforms with an enclosed angle near or equal to 180° a crash, a lock-up or a drastic increase in the platform shear would occur. [510]
NBC 1995 wind report - Exposure factor C_e
For a wind design per the NBC 1995 building code, the reference in the report for the exposure factor C_e now correctly references the source as the Structural Commentaries (Part 4), page 10, equations 2 through 4. [511]

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Build 6236 changes

New Features

Allowable stress increase for supports
The 'Skirt/Legs Stress Increase' value should be input as 1.0 for building codes which apply a reduction factor to the combined wind or seismic loading. For older building codes a value of 1.3 was permitted by the AISC Manual of Steel Construction Allowable Stress Design paragraph A5.2. This allowable stress increase was removed in the AISC 2001 supplement. A warning has been added to the Deficiencies Summary if a value greater than 1.0 is used with newer building codes. [506]
Appendix 3 flange maximum pressure
The upper limit for the Appendix 3 flange maximum pressure calculation has been increased to 20,000 psi. Previously, the upper limit was arbitrarily set at 10,000 psi. Note that this change also applies to Division 1 Appendix 2 flanges. [496]

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Bug Fixes

AD-201 report corrections with SI and MKS units
Report corrections have been made to the AD-201(c) design thickness and AD-201(b) and (c) maximum pressure rating equations. For AD-201(c) design thickness, the axial compressive stress term was incorrectly included for the case where the longitudinal pressure term exceeded the axial compressive term. The changes apply to cylinders, cones and hemispherical heads when using SI or MKS units. [505]
Article 4-440 thick head maximum pressure calculations
For pressure over allowable stress (P / S) ratios greater than 0.08, the thick head formulas are now used to determine the maximum pressure ratings for F and D and ellipsoidal heads. In previous builds, a logical error caused the maximum pressure ratings to be determined per Figure AD-204.1 resulting in unconservative pressure ratings. [497]
AD-415 check for nozzles
The check to determine whether Type No. 1 welds are required for nozzle connections when using AQT-1 materials has been modified to only look at the vessel thickness. Previously, consideration of the nozzle neck thickness and pad thickness would trigger an erroneous message box stating AD-415(a): All joints of Category D shall be Type No. 1 when plate thickness is 2 in. or less (see Fig. AD-613.1). [495]
Appendix 3 basic gasket seating width b_o
The raised face outer diameter is no longer considered in determining the basic gasket seating width (b_o) for facing sketch selections other than Sketch 1a Right and Sketch 1b Left. Previously, entering a raised face outer diameter smaller than the gasket outer diameter would cause a reduction in the effective gasket width even though a raised face is not applicable to the facing sketch selected. [507]
Appendix 3 flange gasket not drawn in the sketch
In the Appendix 3 flange sketch, it was possible for the gasket to not appear in the flange sketch, and the cause was not apparent. This would occur if a facing sketch selection of Sketch 1c or Sketch 1d was selected, the gasket thickness was input as zero, and then the facing sketch selection was changed to another selection. For any facing selections other than Sketch 1c or Sketch 1d, a default gasket thickness is always used so the gasket will be drawn in the flange sketch. [509]
Cone juncture maximum external pressure iteration
The maximum external pressure at cone to cylinder junctures iteration has been changed to allow it to converge more reliably. The iteration was unable to converge when the allowable compressive stress (B) calculated was higher than any of the values in the relevant vacuum chart. [500]
Nozzle in cone hydrotest stress error
For nozzles attached to conical components, the hydrotest stress reported in the Hydrostatic Test summary report was too conservative due to a unit error in the cone half apex angle. [498]
Nozzle liquid static head and WRC-107
The liquid static head is now included in the WRC-107 analysis. Note that for some nozzles locations the static pressure used will now be conservative as the pressure at the end of the nozzle is now used. For typical nozzles (i.e. standard nozzle projection of 6 to 8 inches), the difference is negligible. [503]
Nozzle maximum pressure iteration problem
A correction has been made to the nozzle MAWP reported. In previous builds when the reinforcement calculations were limited by the vessel thickness (i.e. when A₁ is zero) and the static pressure of the nozzle's parent component (e.g. cylinder) was larger than the nozzle's static pressure, the nozzle MAWP reported was incorrectly reduced by the vessel's static pressure instead of the nozzle's static pressure. [501]
Program crash - cone junctures with external pressure
A program crash has been corrected that occurred in the cone juncture external pressure calculations when all of the ring sizes available for the ring type selected (e.g. flat bar) were too small for the loadings specified. [499]
SupportAttachmentPoint set incorrectly -- internal error
For a nozzle attached to a sump head, the error message SupportAttachmentPoint set incorrectly -- internal error was displayed repeatedly. [504]

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Build 6235 changes

New Features

Lower fillet welds and nozzle internal projections
For nozzle Types 3, 4 and 10 the internal projection will now be automatically increased to accommodate the lower fillet weld leg size if required. [489]

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Bug Fixes

A₃ calculation error for nozzles with internal projections
The vessel internal corrosion allowance was not deducted from the nozzle internal projection in calculating the available area A₃. [492]
Circumferential joint efficiency between saddles
For Division 2 vessels on saddles, the allowable longitudinal stress between the saddles was using a circumferential joint efficiency of 0.5 instead of 1.0 resulting in a more conservative design than required. A circumferential joint efficiency of 1.0 will now always be used for this case. [493]
Erroneous deficiency for nozzles with reinforcing pads subject to external loads
The deficiency Pad is attached with partial penetration weld. Connection can not be subject to external mechanical loads or thermal stresses as specified in AD-621 was reported even though a full penetration pad weld was used. [491]

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Build 6234 changes

Bug Fixes

AM-218 error message when designing a seamless component in isolation
The AM-218 governing thickness is now always set to the minimum thickness of the existing component when a seamless component is designed with no other adjoining main vessel components.

Previously, the error message, "Member AM_218_Gov_Thk in the AM_218_Rating class is not set - internal error" would occur when creating\editing the component or when creating the report (F3). This error occurred as the governed thickness routine was reliant on the adjoining component thickness at the circumferential weld seam. [482]
Nozzle maximum pressure reporting issue
The nozzle MAWP and MAP reported now reflect the actual pressure basis used in the analysis for the nozzle design mode Larger of MAWP or MAP.

Previously, only the governing pressure condition was listed for both the MAWP and MAP. For example, if the vessel chamber MAWP governed the nozzle design, then the nozzle MAP was also listed as the vessel chamber MAWP.

This was a reporting error only. Internally, the nozzle is analyzed using the vessel chamber MAWP and vessel chamber MAP, and the governing pressure condition is reported. [486]
Nozzle static head issue
The vessel static pressure used in the nozzle analysis is now taken at the corroded or uncorroded inside diameter, as applicable.

In previous builds, the static pressure used for the vessel required thickness was taken at the start elevation of the parent component. For a nozzle in a bottom head, this could result in the nozzle maximum pressure to be less than the maximum pressure of the bottom head. [485]
SA-36 material description change
The material description for SA-36 is now listed as SA-36 Plate, bar, shapes (ASME II-D p. 256, ln. 25).

In previous builds, the material description referenced only the bar product form although the entry in ASME Section II, Part D, Table 2A is applicable to plate, bar, and structural sections. [483]

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Build 6232 changes

Bug Fixes

AM-218.3(d) minimum design metal temperature
If post weld heat treatment is selected, the rated minimum design metal temperature is now limited to -55°F for coincident ratios of 0.3 or greater. [481]

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Build 6231 changes

Bug Fixes

Appendix 3 flange and bolted cover materials
For Appendix 3 flange and AD-700 bolted cover designs, the Division 1 maximum allowable stress is used from Section II, Part D Tables 1A and 1B. The problem is that for some Division 2 materials (Section II, Part D, Tables 2A and 2B), there is not an exact Division 1 match. In this situation, COMPRESS uses the Division 2 membrane stress intensity and issues a warning in the Deficiencies Summary report. Note that when this issue surfaces, the design can be re-evaluated by specifying an equivalent user defined material where the allowable stresses are established using Division 1 design margins. [479]

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Build 6230 changes

New Features

WRC-107 solve for maximum external load options
In the WRC-107 dialog for the options Solve for P_r, Solve for -P_r, Solve for M_c, or Solve for M_L, the nozzle neck primary general stress (P_m is now considered when determining the maximum permissible external load. See ASME Section VIII Division 2 Appendix 4-138(b) for further information regarding the P_m classification. [476]

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Bug Fixes

AM-218 and AF-402 cylinder governing thickness determination
For a head to shell circumferential joint where the head has a straight flange, the head minimum thickness was incorrectly considered instead of the straight flange nominal thickness in determining the cylinder's AM-218 and AF-402 governing thickness. The result was that for certain scenarios where the circumferential joint in question governs (typically seamless shells), the cylinder's MDMT rating and PWHT requirement could be unconservative. [478]
AM-218 and AF-402 seamless head governing thickness determination
For a seamless head with a thicker straight flange than the attached shell, the head governing thickness was incorrectly determined as the straight flange thickness. [473]
Diameter versus thickness sanity check
An error has been corrected in the sanity check to ensure that the thickness of a component did not exceed the outer radius. The result was an erroneous message box that stated "Diameter must be greater than zero." [477]
Nozzle neck longitudinal stress due to pressure plus external loads
A correction has been made in the nozzle neck longitudinal stress calculation for pressure plus external loads. The stress due to the radial external load was incorrectly using an average nozzle neck radius which resulted in too small of a stress. In addition, in the calculations of the stress component due to the external moments the extreme fiber location used has been changed from an average nozzle neck radius to the outer diameter of the nozzle neck. Note that this calculation is only reported when the nozzle neck stress is greater than the allowable stress. [475]
Nozzle reinforcement calculation for external pressure
The corroded diameter was not always being properly accounted for in the nozzle reinforcement external pressure check resulting in the possibility of an unconservative design. [474]

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Build 6229 changes

Bug Fixes

Program crash
A program crash has been corrected which occurred when the AM-218.3 thickness ratio was approximately equal to 0.3. The crash occurred due to a failure to retrieve the necessary reduction temperature. [472]

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Build 6227 changes

New Features

Rigging Analysis now available
The rigging analysis is now available in Div 2. [468]
ASME II-D material line and page numbers
The material specification page number and line number from ASME Section II Part D is now listed in the detailed component report. [453]

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Bug Fixes

AD-602 Minimum thickness of nozzle neck
For the calculation of the minimum nozzle neck thickness per AD-602, the required nozzle neck thickness in the longitudinal direction is now considered due to internal pressure in combination with external loads if present. [467]
Full penetration groove welds
For nozzles, the setting "Groove welds are full penetration" was not being saved with file. This resulted in the setting always being inactive when a file is opened. [471]
Liquid weight acting on hemispherical heads
For a vertical vessel with a hemispherical bottom head where the support attachment point is above the head circumferential weld seam, the liquid weight acting on the head was not properly included in the head thickness design thickness calculation. [396]
Nozzle reporting error in Results Summary section
For hillside nozzles when the plane along the short chord governed the reinforcement check, the governing plane was sometimes incorrectly listed as the long chord in the Results Summary section of the detailed nozzle report. [469]

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Build 6225 changes

Bug Fixes

MKS pressure/stress units reporting error
Units of pressure and stress were always reported as technical atmospheres when using MKS units for the case of Table AHA-1 materials. Selecting "bar" or "Kg/cm²" as the pressure basis did not change the units reported in this circumstance. [466]

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Build 6221 changes

New Features

ASME VIII-2 A03 Addenda added
The ASME Section VIII-2 A03 Addenda has been implemented.

The following tables have been added to the COMPRESS database to reflect the Section II-D A03 Addenda:

Table 2A
Table 2B
Table 3
Table NFC-7 (new vacuum chart)
Table U
Table Y-1

4) The following tables from the COMPRESS database have been updated to reflect the Section II-D A03 Addenda:

Table NFA-6 re-designated as NFC-8 (vacuum chart)
Table TE-5
Table TM-4
Table TM-5
Table NF-1
Table NF-2 [459]

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Bug Fixes

Crash when adding a head closure to a nozzle
Program would crash when attempting to add a head to a nozzle. [456]
Vacuum ring MAEP iteration
COMPRESS would "hang" during the vacuum ring MAEP iteration in certain cases. [457]

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Build 6219 changes

New Features

Studding outlets
Type 11 studding outlets are now available. [449]

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Bug Fixes

Deficiency dialog typo
Corrected a typographical error in the deficiencies dialog. The temperature symbol used to report nozzle MDMT errors was not correct. [452]
Nozzle coincident ratios and MDMT rating
Nozzles having coincident ratios less than 0.3 were not being exempted as allowed per AM-213.1. This resulted in MDMT ratings that were too high (conservative). [447]
Nozzle MDMT rating
The impact test temperature reduction per AM-218.4(g) was not being considered resulting in nozzle MDMT ratings that were too high (conservative). [450]
Nozzle on nozzles
Nozzles located on another nozzle could produce an internal error. [446]
Nozzle thermal expansion coefficient check
For the AD-550 check (thermal expansion coefficient check), a separate check is now performed for the vacuum case for using the vacuum design temperature. Previously, the internal pressure design temperature was used to determine thermal expansion coefficients for all cases. [322]

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