Codeware | Knowledgebase Articles By Topic

Advanced Topics
Anchor Bolts/Support Skirts/Base Rings
Appendix 2 Flanges
ASME B16.5/B16.47 Flanges
ASME Code Addenda
Bolted Covers
Building Codes
Cones (Transitions)
Cylinders
Deficiencies
Drafter Program
Error Messages
External Loads
External Pressure
Finite Element Analysis (FEA)

Flanges
Forms
HASP Key Issues
Heads
Heat Exchangers
Hydrotest
Impact testing
Internal Pressure
Joint Efficiency
Legs
Lifting Lugs/Clips/Stiffener Beams
Materials
MAWP/MAP
MDMT
Networking

Nozzles
Pipe/Couplings/Pipe Caps
Program Operations
Radiography
Rings
Reports
Saddles
Software Updates
Thickness Calculations
Transitions
Units of Measurement
Vacuum Rings
Verification
Welds
WRC 107 Calculations

Advanced Topics and U-2(g)
Can ASME Section VIII Division 1 and COMPRESS be used at design pressures greater than 3000 psi? Are UG-22 loads considered in COMPRESS? Where in COMPRESS can I find this indication? How does COMPRESS calculate the fundamental period of vibration (frequency) for vertical pressure vessels? I see there is a consideration for lethal service in the COMPRESS Design Settings Summary. Where is lethal service specified in COMPRESS? Does COMPRESS consider vortex shedding? How do I turn vortex shedding on in COMPRESS? How do I change the UG-22 loadings specified in the Settings Summary? How do I turn on consideration of tower/column deflections due to wind in COMPRESS?
Top

Anchor Bolts, Support Skirts and Base Rings
How does COMPRESS treat anchor bolt design? How is the anchor bolt clearance defined? What is the procedure for performing the base ring anchor bolt calculation? Does COMPRESS check the minimum spacing of anchor bolts for support skirts? The actual bolt spacing for the number of bolts I have entered exceeds the value I entered as minimum bolt spacing? The COMPRESS database does not contain the bolt size I need for my flange (or for skirt base ring, etc). How do I add bolts to the database? Why doesn't COMPRESS apply the maximum bending moment to the anchor bolts in my base ring report? This results with the required area of the bolt being reported as zero (0)? COMPRESS will not allow me to attach a skirt to a transition (cone). Why? COMPRESS uses only 60% of the weight for determining the tensile force in the anchor bolts when designing a vessel using the ASCE 7-05 Code. What is the reason for not using 100%? Does COMPRESS include an initial bolt preload when designing anchor bolts and base plate? What is the preload used? I receive a tailing lug deficiency message that states "The local stresses for the lug have not been calculated." What does this mean and why is it presented? Does COMPRESS apply the 1/3 increase in allowable stress permitted for structural steel by the AISC (American Institute of Steel Construction) Steel Design Standard? How do I specify that the support skirt base ring is welded, not bolted, to the (skid) base plate?
Top

Appendix 2 Flanges
How does COMPRESS determine the UG-99 stress ratio for flanges designed to Appendix 2? I get a value different from what is reported in the Hydrotest Report. Why aren't stresses determined for Appendix 2 flanges during the hydrostatic test? Instead, COMPRESS reports that the stress was not investigated ("NI")? How does COMPRESS consider external loads applied to flanges?
Top

ASME B16.5 and B16.47 Flanges
How does COMPRESS determine hydrostatic test pressure? Is the effect of the test static head on components such as ANSI flanges considered? How are the hydrotest rules of UG-99 applied to ANSI/ASME flanges? Why can't I add user defined materials for use in specifying ANSI/ASME flanges? Why do I get the message "For Class 150 flanges, ASME B16.5 para. 5.4.2 recommends gaskets to be in accordance with Fig. E1, Group No. I" and what does it mean? May different materials be specified for a flange and its attached blind flange? Why do I receive the flange notification "NOTE: Suitable low temperature bolting material is required?" What does it mean? How are external loads acting on a standard body flange considered in COMPRESS? Hydrostatic test pressures for ASME B16.5 flanges attached to nozzles are listed in the COMPRESS nozzle report. How are the hydro test pressures for ASME B16.5 flanges determined? How do I specify a long weld neck flange to be used as a nozzle in COMPRESS? I want to attach a standard ASME B16.5/B16.47 blind flange to a studding outlet (COMPRESS Type 11 or Type 12 nozzle) but the button to attach flanges to the nozzle is disabled. Why? COMPRESS does not have a corrosion allowance input for ASME B16.5/B16.47 flanges. Why?
Top

ASME Code Addenda
COMPRESS will not let me update\change the ASME Addenda in a CW6 file (the Addenda selection is not available). Why? How can I update the Addenda selection? Some of our projects require the use of older (non-current) Code Addenda. Do I need to install a different COMPRESS version for each ASME Code Edition or Addenda that I want to use? Has COMPRESS undergone a certification process to verify the accuracy of the ASME Code calculations performed? Is COMPRESS verification documentation available?
Top

Bolted Covers
Why does COMPRESS apply different values for "C" for internal and external pressure cases when designing a bolted cover per UG-34?
Top

Building Codes
COMPRESS divides the calculated seismic base shear by 1.4. Where is this specified in Uniform Building Code (UBC)? What is the background of the building codes such as ASCE, BOCA and IBC and how do they fit into pressure vessel design? How does COMPRESS determine the wind force coefficient factors Cf applied to horizontal vessels? What specific conditions apply to the vessel "Empty" case? Does COMPRESS automatically increase the effective vessel OD to account for insulation? Does COMPRESS apply the 1/3 increase in allowable stress permitted for structural steel by the AISC (American Institute of Steel Construction) Steel Design Standard? Why does COMPRESS apply a factor 0.6 to the weight W when calculating anchor bolt loads and required thicknesses of shells based on longitudinal stress? Does COMPRESS consider vortex shedding? How do I turn vortex shedding on in COMPRESS? How do I change the UG-22 loadings specified in the Settings Summary?
Top

Cones (Transitions)
I designed a cone but it is not oriented the right way. How do I correct this? How do I design an eccentric cone on a vertical vessel? How does COMPRESS calculate the minimum flare thickness for the case of internal pressure in transitions with flares. How does COMPRESS determine the maximum elongation for cones (transitions)? What does the message "Transition calculations cannot be completed until a cylinder is attached to the small [or large] end of the cone (or the discontinuity is eliminated)" mean?
Top

Cylinders
Why does COMPRESS sometime increases the nominal thickness of cylinder components more than 1/16" (or 1/8") beyond the design thickness shown in the thickness summary table?
Top

Deficiencies
I receive deficiency "Do/t > 1000 which is outside of ASME code range. U-2(g) analysis performed. (warning)." This occurs for nozzles or cylindrical shell sections, but what does it mean? I get a deficiency for the cone report "Appendix 1-8(c): a stiffener ring is required at the cone small end" even though I have specified a stiffening ring for that juncture. Why? Why do I get the message "The length of the nozzle has been increased to satisfy the minimum nozzle projection requirement as specified under Action/Set Mode/Nozzles 1 tab" and what does it mean? I get a warning that the aspect ratio of long chord to nozzle ID exceeds 2.0. What does this mean and what do I do? My cone angle is less than 30°. Why does COMPRESS return a Deficiency "Transition calculations cannot be completed until a cylinder is attached to the large [or small] end of the cone (or the discontinuity is eliminated)"? How do I restore the Warnings after they have been suppressed? There's a switch on the Deficiencies message dialog but that dialog isn't displayed if there are no Deficiencies. What does the deficiency "Reinforcement pads are not recommended for temperatures where time dependent material properties govern (creep regime)" mean? I get a Deficiency for my flange bolts (below). How do I resolve this? I receive a "Rigid insert assumption questionable" warning message for a nozzle WRC-107 calculation. What does it mean? I receive the deficiency “WRC-107: Geometry beyond the limits of shallow shell theory (at pad edge) WRC-107: Geometry beyond the limits of shallow shell theory”
Top

Drafter Program
How do I customize the Vessel Drafting Program? Which AUTO Lisp source code may be modified? How do I export a file from COMPRESS to Vessel Drafting Program (VDP)? How do I customize the default title blocks in VDP? Vessel Drafting Program (VDP) will not draw using SI units or will not retain "SI" units selected in Drafter Setup menu. When I run Vessel Drafting Program (VDP), the VDP menus are not available. How can I resolve this? The Vessel Drafting Program (VDP) is unable to recognize my installation of AutoCAD. How can I resolve this?
Top

Error Messages
Why do I receive the error message, "ASP Status : LM old version was found (42)(2)" when I try to run the network version of COMPRESS? What procedure should I follow if I receive the message below indicating that my HASP driver is not found or is not installed? What should I do if I receive an error stating "Unknown Status code (65436)"? I am receiving a registry error "Registry editing has been disabled by your editor" when I run COMPRESS. What can I do to resolve this issue? On start up, COMPRESS displays a message stating "An error was raised while trying to open Asme.mdb..." as shown below. What can I do to resolve this problem? I get a "Server Busy" error message when I try to start COMPRESS. What can I do about it? When I install COMPRESS, I get an error message saying "Setup has detected that UnInstallShield is in use. Please close UnInstallShield and restart setup. Error 432." How do I resolve this error message? COMPRESS crashes and produces an error message when ASME Code calculations are run (crashes after pressing the function key F3). How can I correct this problem? I get a Microsoft .NET Framework error 1603 when I try to install COMPRESS. What does this mean and what can I do to correct the problem? What should be done if an error stating "Registration of ASME_Calcs.dll failed" is displayed when COMPRESS starts up?
Top

External Loads
What is the basis for the "External Pressure + Weight + External Loading Check" analysis performed in COMPRESS? How are external loads on nozzles treated in COMPRESS? How does COMPRESS determine allowable compressive stress used in evaluating stresses in the longitudinal direction? How does COMPRESS consider external loads applied to flanges? How do I determine the maximum external loads that can be applied to a nozzle? How are external loads acting on a standard body flange considered in COMPRESS? I get the warning "External loads may cause the pad to fail by buckling unless intermediate pad welds are used - See Bednar 7.5 paragraph 3." What does this mean and why do I get it? Numerical values for external nozzle loads in the WRC-107 report, such as M_L and M_c, do not agree with the loads reported by the finite element analysis (FEA nozzles). Why? Why does COMPRESS not provide an option to attach "Clips/Lugs" (from Attach menu) to formed heads? Why does COMPRESS apply a factor 0.6 to the weight W when calculating anchor bolt loads and required thicknesses of shells based on longitudinal stress? Does COMPRESS consider vortex shedding? How do I turn vortex shedding on in COMPRESS? How do I turn on consideration of tower/column deflections due to wind in COMPRESS?
Top

External Pressure
I receive deficiency "Do/t > 1000 which is outside of ASME code range. U-2(g) analysis performed. (warning)." This occurs for nozzles or cylindrical shell sections, but what does it mean? What is the basis for the "External Pressure + Weight + External Loading Check" analysis performed in COMPRESS? Why does COMPRESS use vacuum chart CS-3 for material SA-537? Shouldn't this be CS-4, since CS-4 applies to SA-537 material?
Top

Finite Element Analysis (FEA)
How do I update my COMPRESS license to include finite element analysis of nozzles (FEA-Nozzles) capabilities? How do I perform FEA on Nozzles? How do I specify that a nozzle fatigue analysis is to be performed? What is the difference between the FEA Nozzles option included in COMPRESS and the NozzlePRO software package?
Top

Flanges
How are ANSI/ASME flanges treated in COMPRESS? How are the hydrotest rules of UG-99 applied to ANSI/ASME flanges? Why do ANSI/ASME flange materials not use the correct material designation? Why can't I add user defined materials for use in specifying ANSI/ASME flanges? Does COMPRESS distinguish between Series A and Series B ANSI flanges and how do I specify the difference? Why do I get the message "For Class 150 flanges, ASME B16.5 para. 5.4.2 recommends gaskets to be in accordance with Fig. E1, Group No. I" and what does it mean? How does COMPRESS determine the bore dimension for Heavy Barrel flanges? How does COMPRESS determine the UG-99 stress ratio for flanges designed to Appendix 2? I get a value different from what is reported in the Hydrotest Report. How do I attach nozzles to standard blind flanges? How are long weld neck flange dimensions determined? Why does COMPRESS (or Modeler) not provide a selection for flange facing of standard ASME/ANSI B16.5/B16.47 flanges? How are raised face and ring type flanges to be distinguished? May different materials be specified for a flange and its attached blind flange? When designing a flange per Section VIII Division 1, Appendix 2 COMPRESS will increase the pressure if external moment and axial load exist on the flange. The equivalent pressure due to the moment and axial load is found. But this equivalent pressure is applied only to the term 'H' and not to 'HP' or 'HD'. Why isn't the equivalent pressure applied to these terms also? Why aren't stresses determined for Appendix 2 flanges during the hydrostatic test? Instead, COMPRESS reports that the stress was not investigated ("NI")? Why does COMPRESS report "N/A" (for "not available") on the Pressure Summary for MAEP of ASME B16.5 and B16.47 standard flanges and blind flanges? COMPRESS uses the combined thickness of the shell and flange hub as dimension "g0" when calculating slip-on integral flanges per Appendix 2. Shouldn't g0 be the thickness of the shell only? For Appendix 2 flanges COMPRESS reports only calculations based on the flange thickness entered. How does COMPRESS determine the required thickness reported for an Appendix 2 flange? How is the MAWP of the flange determined? How does COMPRESS consider external loads applied to flanges? The MDMT rating of my ASME B16.5 or B16.47 flange is not what I was expecting. What could be the cause? How does COMPRESS design flanges with full face gaskets? What Edition of ASME B16.5 and ASME B16.47 does COMPRESS use for standard flanges? How do I specify a long weld neck flange to be used as a nozzle in COMPRESS?
Top

Forms
How do I submit an ASME Form produced by COMPRESS to the National Board electronically?
Top

HASP Key Issues
Why do I receive the error message, "HASP Status : LM old version was found (42)(2)" when I try to run the network version of COMPRESS? What procedure should I follow if I receive the message below indicating that my HASP driver is not found or is not installed? What procedure should I follow if I receive the message below indicating that my HASP driver installation fails due to failure to start the Aladdin Device Driver? What should I do if I receive an error stating "Unknown Status code (65436)"? How do I obtain and customize the Nethasp.ini file on the COMPRESS "client" computers to specify the network address of the Key Server? My HASP key is not communicating with the computer. How can I check to see if my key is defective? How do I determine which users are currently accessing our COMPRESS network licenses? How do I transfer the COMPRESS network installation to another key server computer? What procedure should I follow if I receive the message below indicating that HASP Status: Number of stations exceeded. (42)(0)? Should I insure my Codeware software license(s) against loss or theft? What is the replacement cost in the event my license (hardware key) is lost or stolen? How do I verify that my key server computer has HASP drivers, HASP License Manager and Codeware Key Manager installed? What is HASP License Manager and how does it work with COMPRESS? I have both single user and network COMPRESS licenses (keys). How can I switch between my single user and network licenses (keys)? I am having trouble using the supplied .cw6p password file. After double clicking the .cw6p password file, Key Manager crashes and displays an error message. How do I resolve this and finish updating my key? After double clicking on the .cw6p password file, I get a "Windows cannot open this file:" error message. How do I resolve this and finish updating my key?
Top

Heads
Some unexpected results occur when designing heads: COMPRESS uses K factors different from what user expects and COMPRESS may return unusual values for thickness for high pressures. How does COMPRESS account for forming allowance on heads? What is the convention used in COMPRESS for defining angular orientation on heads? I designed a cone but it is not oriented the right way. How do I correct this? How do I design an eccentric cone on a vertical vessel? Does COMPRESS consider buckling in the head? Why does COMPRESS increase the minimum thickness that I enter for an F&D (or ellipsoidal) head? Why does COMPRESS apply joint efficiency E = 0.85 or E=0.70 when I specify a seamless hemispherical head? Shouldn't E = 1.0 for a seamless head? How can I specify an internal head in COMPRESS? The allowable stress used by COMPRESS in the design of a torispherical (F&D) head is lower than the value listed in ASME II-D. What is causing this? How do I specify the radiography to be performed at the circumferential seam of bottom head? COMPRESS has disabled the RT selection list.
Top

Heat Exchangers
How do I specify a jacketed vessel? Why do parts of the Vessel and Heat Exchanger Wizard dialogs get cut off on my screen? How do I specify that a heat exchanger is to be designed for external pressure? The heat exchanger data input screens don't allow me to enter all of my design temperature or corrosion details. How can I input the required temperature, MDMT or corrosion information into COMPRESS? How is the maximum stress range calculated for an expansion joint per TEMA RCB-8.83? And shouldn't Scl be within 1.5*S where S is the maximum allowable stress value? How does COMPRESS consider gasket grooves in tubesheets? Do I need to increase the thickness of a tubesheet calculated by COMPRESS to account for gasket grooves? COMPRESS does not perform tube-to-tube sheet joint calculations for U-tube heat exchangers. What is the reason for this? Why is the tubesheet thickness required by ASME UHX different\greater than the required thickness calculated by TEMA? How can I get thinner tubesheets when using ASME UHX? How do I add a tailing lug to a skirt supported (vertical) heat exchanger? How is the Allowable Stress for Tubesheet during hydrostatic test determined?
Top

Hydrotest
How does COMPRESS determine the allowable stresses specified for hydrostatic testing; why does COMPRESS report different allowable stresses for the same material when used as a shell component or a nozzle? How does COMPRESS determine hydrostatic test pressure? Is the effect of the test static head on components such as ANSI flanges considered? How are the hydrotest rules of UG-99 applied to ANSI/ASME flanges? What is the option "calculate hydrotest stress"? How does COMPRESS determine the UG-99 stress ratio for flanges designed to Appendix 2? I get a value different from what is reported in the Hydrotest Report. Why aren't stresses determined for Appendix 2 flanges during the hydrostatic test? Instead, COMPRESS reports that the stress was not investigated ("NI")? Can COMPRESS consider wind loads during hydrotest? Where in the report are the resulting calculations located? Can COMPRESS perform hydrotest calculations in the corroded condition? What effect does butt weld joint efficiency have on the stress at hydrostatic test condition? How is the Allowable Stress for Tubesheet during hydrostatic test determined? What effect does butt weld joint efficiency have on the stress at hydrostatic test condition?
Top

Impact Testing
When does COMPRESS apply the impact test exemption requirements of UCS-66? How does COMPRESS determine an exemption from impact testing requirements? How does COMPRESS determine the rated MDMT?
Top

Internal Pressure
How does COMPRESS determine the pressure due to operating liquid level? What density of water does COMPRESS use? Why does COMPRESS apply different values for "C" for internal and external pressure cases when designing a bolted cover per UG-34? How does COMPRESS calculate the minimum flare thickness for the case of internal pressure in transitions with flares. How does COMPRESS handle static liquid pressure?
Top

Joint Efficiency
How does COMPRESS determine the joint efficiency and exemption from impact testing requirements for welded and seamless pipes? How do I change the joint efficiency in the COMPRESS calculations? When designing the skirt, why does COMPRESS use joint efficiency = 1.0 instead of the values I have entered? Why does COMPRESS apply joint efficiency E = 0.85 or E=0.70 when I specify a seamless hemispherical head? Shouldn't E = 1.0 for a seamless head? What values should I enter for a skirt joint efficiency? Why does the joint efficiency (E) shown under the Nozzle Required Thickness Per UG-27(c)(1) not match the joint efficiency (E) reported under the UG-45 Nozzle Neck Thickness Check? How does COMPRESS consider the joint efficiency of a nozzle neck fabricated from rolled plate? What effect does butt weld joint efficiency have on the stress at hydrostatic test condition? Where can I find more information on the ASME Code's joint efficiency rules?
Top

Legs
How does COMPRESS determine what allowable stress factor increase to use? How does COMPRESS treat anchor bolt design? How does COMPRESS determine the values of C1 and C2 when calculating stresses at the shell to leg attachment location? Is there a stiffening effect due to the head? Why won't COMPRESS allow me to attach clips/lugs or legs to heads? Why is the saddle support listed in the Pressure Summary and how may it limit my vessel MAWP? In some cases COMPRESS increases the height I have specified for the reinforcing pad of support legs. What rules does COMPRESS follow to determine the height and location of reinforcing pads for legs? Does COMPRESS apply the 1/3 increase in allowable stress permitted for structural steel by the AISC (American Institute of Steel Construction) Steel Design Standard? What is the basis of the COMPRESS support leg analysis? How do I add a new pipe size to the support leg table? How can I attach support legs to the bottom head?
Top

Lifting Lugs, Clips and Stiffener Beams
How does COMPRESS determine what allowable stress factor increase to use? How does COMPRESS determine the allowable stresses for lifting lugs? Why isn't the option to allow "Use MAWP" available on the leg design dialog (or support lug, or support saddle dialog)? COMPRESS refers to a stiffener beam in the tailing lug calculation. What is a “stiffener beam” and what is its purpose? Why does COMPRESS not provide an option to attach "Clips/Lugs" (from Attach menu) to formed heads? I receive a tailing lug deficiency message that states "The local stresses for the lug have not been calculated. "What does this mean and why is it presented? How do I add a tailing lug to a skirt supported (vertical) heat exchanger?
Top

Materials
How do I add a material to the material database? How do I specify materials that are not defined in ASME Section II Part D? Why can't I add user defined materials for use in specifying ANSI/ASME flanges? Where can I find and how may I add more materials for use in specifying vessel components? May different materials be specified for a flange and its attached blind flange? Why does COMPRESS use vacuum chart CS-3 for material SA-537? Shouldn't this be CS-4, since CS-4 applies to SA-537 material? How can I use the same user-defined material at different temperature? What does the "Edit All Stress Values" button do on the user-defined material dialog? How do user defined materials in COMPRESS differ from materials found in the ASME materials database? COMPRESS occasionally reports the message "Material is not produced to Fine Grain Practice”. What is meant by the term "Fine Grain Practice"? How can I retain my existing user-defined materials and structures when I updating to a new COMPRESS build?
Top

MAWP/MAP
Why does COMPRESS use the saddle web thickness in the Ring Compression Stress calculation? It should use the saddle width? How does COMPRESS determine the MAWP and MAP for transitions? How does COMPRESS determine the MAWP and MAP for nozzles? Some nozzles may be exempted by UG-36(c)(3)(a) from area replacement requirements. How does COMPRESS determine the MAWP and MAP for these nozzles? Why isn't the option to allow "Use MAWP" available on the leg design dialog (or support lug, or support saddle dialog)? Why is the saddle support listed in the Pressure Summary and how may it limit my vessel MAWP? How do we specify a mode to calculate the MAWP and MAP which shall be limited by shell, heads or flange rating only (not the nozzle neck)? For Appendix 2 flanges COMPRESS reports only calculations based on the flange thickness entered. How does COMPRESS determine the required thickness reported for an Appendix 2 flange? How is the MAWP of the flange determined? How does COMPRESS calculate the MAP of transitions? Does the orientation of the vessel affect this calculation? Why aren't the MAWP and MAP of a transition (cone) identical when the allowable stresses are equal for the two temperature conditions?
Top

MDMT
When determining the MDMT rating per Figure UCS-66.2 COMPRESS bases the coincident ratio on longitudinal stress (as reported in the output) for seamless cylinders but not for welded cylinders. Why? How does COMPRESS determine an exemption from impact testing requirements? How does COMPRESS determine the rated MDMT? The MDMT rating of my ASME B16.5 or B16.47 flange is not what I was expecting. What could be the cause?
Top

Networking
Why am I sometimes unable to save COMPRESS files on a network drive? How do I install the network version of COMPRESS? How can system administrators and others prevent COMPRESS build 6221 and later from automatically checking for software updates through the internet when the program is started? The starting time for COMPRESS is unusually long. How can I shorten the start up time? Can I run COMPRESS if I don't have administrative rights to my computer? Is COMPRESS compatible with Microsoft Windows Vista? Is COMPRESS compatible with 64-bit versions of Microsoft Windows? How do I transfer the COMPRESS network installation to another key server computer? I get a "COMPRESS update failed" message when I try to use the COMPRESS online update. Why won't the update work? The COMPRESS component reports are printed in a different order than was selected. What is causing this? How do I verify that my key server computer has HASP drivers, HASP License Manager and Codeware Key Manager installed? What is HASP License Manager and how does it work with COMPRESS? I have both single user and network COMPRESS licenses (keys). How can I switch between my single user and network licenses (keys)?
Top

Nozzles
Why does COMPRESS not use the design pressure when reporting the nozzle calculations (nozzle report)? What pressure is used for designing nozzles? How does COMPRESS determine the MAWP and MAP for nozzles? Some nozzles may be exempted by UG-36(c)(3)(a) from area replacement requirements. How does COMPRESS determine the MAWP and MAP for these nozzles? How does COMPRESS determine which nozzles fall under the category of "large openings" subject to the rules of Appendix 1-7? How are external loads on nozzles treated in COMPRESS? I have specified a nozzle neck made of welded pipe. Why does COMPRESS divide allowable stress by 0.85 when calculating nozzle required thickness 'trn'? How do I attach nozzles to standard blind flanges? What happens when a nozzle's reinforcement extends beyond the nozzle's parent component and onto adjacent components? How does COMPRESS handle this situation and what are the implications? How is the nozzle projection from outside surface, Lpr, defined? Why doesn't the required thickness 'tn' in the Nozzle Summary match that shown in the nozzle report? Why doesn't COMPRESS provide calculations for required fillet weld on internal projection of some nozzles? Why does COMPRESS apply numerical factor "2" when considering the nozzle reinforcing area A2? This should be "5" as per Figure UG-37.1? Why doesn't COMPRESS determine the alternate minimum required thickness of ellipsoidal heads as per UG-32(b)? COMPRESS reports that a small diameter nozzle has inadequate reinforcing area for design pressure (or reports nozzle MAWP < Design Pressure). But shouldn't the nozzle should be exempted by size based on UG-36(c)(3)(a)? How does COMPRESS apply the minimum nozzle projection from Set Mode Options when there is a flange or when the nozzle is an integral forging with flange? How do I design offset or tilted nozzles on sump? The only option available is for "radial" nozzles. How do I determine the maximum external loads that can be applied to a nozzle? How do I locate a nozzle in a head? Can COMPRESS model a localized thickness increase? Due to an external loading on a nozzle I need a large reinforcement pad. I receive a warning that the pad is outside the limits of reinforcement. Is there a way to model an internal plate that will allow for this? Does COMPRESS calculate elliptical (obround) openings? Why does the joint efficiency (E) shown under the Nozzle Required Thickness Per UG-27(c)(1) not match the joint efficiency (E) reported under the UG-45 Nozzle Neck Thickness Check? How does COMPRESS consider the joint efficiency of a nozzle neck fabricated from rolled plate? How do I update my COMPRESS license to include finite element analysis of nozzles (FEA-Nozzles) capabilities? Why are the reinforcing areas shown in the nozzle reports different from those shown in the status bar at the bottom of the nozzle design dialog? How do I specify a long weld neck flange to be used as a nozzle in COMPRESS?
Top

Pipe, Couplings and Pipe Caps
How do I add elbows, tees or other piping components to COMPRESS? I have specified a nozzle neck made of welded pipe. Why does COMPRESS divide allowable stress by 0.85 when calculating nozzle required thickness 'trn'? Why doesn't the required thickness 'tn' in the Nozzle Summary match that shown in the nozzle report? Why does COMPRESS sometimes apply a factor of (1/0.85) when calculating required cylinder thicknesses due to external loads? Why doesn't COMPRESS subtract the pipe mill tolerance in the shell thickness "t" when performing the nozzle reinforcing calculations per UG-37?
Top

Program Operations
Does COMPRESS provide an "auto save" or file backup feature? Questions regarding level of detail of screen graphics Why do parts of the Vessel and Heat Exchanger Wizard dialogs get cut off on my screen? What do the locked fields "Top Head Start" and "Top Head End" on the platform design dialog indicate? How do I create a template file for Vessel Wizard? How can I save PDF reports if I don't have administrative rights to my computer? How do I make a screen print of a message or dialog? How can I get COMPRESS to automatically update when a new build is posted on the website? I am running into complications when running COMPRESS with my Anti-Virus software. How can I resolve this? If I update to a newer version of COMPRESS, will my settings be preserved? I am trying to add a component to the top of my vessel, but the component is added to the bottom. How can I add my component to a location other than the bottom? How do I change the orientation of my vessel from vertical to horizontal and vice versa? How do I ensure I am running the latest version of FEA-Nozzles? How can I add a custom user-defined structure (vacuum ring, support leg, stiffener ring, etc.) to COMPRESS? Can I run COMPRESS if I don't have administrative rights to my computer? What are the system requirements to run COMPRESS? Is COMPRESS compatible with Microsoft Windows Vista? Is COMPRESS compatible with 64-bit versions of Microsoft Windows? COMPRESS saves files with several different extensions. Please explain what the extensions are associated with. I cannot find the COMPRESS "cw6" file in Windows Explorer; only "cw5" files are listed. What is Data Execution Prevention (DEP) and how can I run it with COMPRESS if it is enabled on my system? How do I change the default color scheme used by COMPRESS? Should I insure my Codeware software license(s) against loss or theft? What is the replacement cost in the event my license (hardware key) is lost or stolen? I get a "COMPRESS update failed" message when I try to use the COMPRESS online update. Why won't the update work? COMPRESS will not let me update\change the ASME Addenda in a CW6 file (the Addenda selection is not available). Why? How can I update the Addenda selection? The COMPRESS component reports are printed in a different order than was selected. What is causing this? How do I submit an ASME Form produced by COMPRESS to the National Board electronically?
Top

Radiography
I have a vessel design that requires an "RT2" designation. I selected 100% (full) RT on the longitudinal seams and Spot RT on the circumferential (girth) seams but the COMPRESS summary reports "RT3" in the summary report. How do I get COMPRESS to report "RT2"? How does COMPRESS consider the joint efficiency of a nozzle neck fabricated from rolled plate? What effect does butt weld joint efficiency have on the stress at hydrostatic test condition? How do I specify the radiography to be performed at the circumferential seam of bottom head? COMPRESS has disabled the RT selection list. What effect does butt weld joint efficiency have on the stress at hydrostatic test condition?
Top

Rings
What is the meaning of the "Max. Depth to Thickness Ratio" input for vacuum rings? What is the procedure for performing the base ring anchor bolt calculation? Why doesn't COMPRESS apply the maximum bending moment to the anchor bolts in my base ring report? This results with the required area of the bolt being reported as zero (0)? What shell thickness does COMPRESS apply when determining the MAEP (maximum allowable external pressure) of the vacuum rings? What location on the ring does COMPRESS use when locating vacuum rings from the datum? Do vacuum rings locations refer to the bottom of the ring, middle or top of the ring?
Top

Reports