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  1. jproj

    Forged Flange Modification

    Hi All, I have a question relating to a 900# RFLWN "Type V2" FVC forged flange (SA-182 F22 CL3 material) that is currently on a vessel in hydrogen & sour service (similar to the one pictured on page 11 here: http://www.forgedvesselconn.com/catalog030199_2.pdf ). Is it possible (perhaps...
  2. jproj

    Simplify table w/out hide or group

    Hi all, I have a large group of data basically organized by columns that I want to consolodate into a much smaller table on a separate worksheet. The smaller table would contain the same information as the larger table with the same format, but would exclude many unnecessary columns. I would...
  3. jproj

    Pressure Rating for Dual Cert. Flange (304/304L)?

    I'm hoping someone can verify my understanding of the pressure ratings of dual rated flanges ASME B16.5. I only have the 1996 ed. so bear with me on the paragraph numbers. My understanding is that either of the applicable flange rating charts may be used (per paragraph 2.7 and 4.1.2(d)) as...
  4. jproj

    UG-29 Clarifications

    I am trying to work through UG-29(a) and have a couple of questions. 1) Assuming the vessel has multiple stiffening rings, are I and I' the moments of inertia for a single stiffening ring, or the sum of all stiffening ring inertias? 2) Similar to the above question, is As the total cross...
  5. jproj

    Application of Seismic Loads to Saddle

    I am trying to apply a horizontal seismic / wind load to my vessel supports (vertical reaction load). Unfortunately, the only reference I have available is the Pressure Vessel Design Manual by Dennis Moss. Aside from the errors and non-existent derivation of equations, the outlined equation...
  6. jproj

    Table UW-12 / Head Circ. Seam JE Clarification

    UW-12(d) clearly specifies the joint efficiency for seamless heads with or without spot radiography (0.85). Does the code specify JE for seamed (e.g. two-piece) heads? It is my understanding that it depends on the RT performed on the head long seam(s). For instance, if the 2-piece head long...
  7. jproj

    MAWP vs. Design Pressure

    Recently while trying to finalize a nameplate issue, I had an interesting discussion with one of our fab shops. They kept showing the vessel design pressure (50 psig) as the MAWP on their code nameplate drawings. The code calculations showed an actual vessel MAWP to be much higher (~140 psig)...
  8. jproj

    Userform Interaction w/ BeforeSave Event

    I have an excel spreadsheet in which I would like to restrict the saving of any changes (make it password protected when save or saveas is activated). I have no problem with the code when using an inputbox as the user interface for the password, except that the password is visable when one...
  9. jproj

    H2S Removal

    I am wondering if H2S can be removed from water by vacuum flashing. I've read that the main methods for removal are oxidation and filtration, but I can't find anything discussing the use of vacuum systems as a means of mechanical removal. The water is going to a boiler so oxidation is not...
  10. jproj

    Vacuum Breaker Design?

    Are there any guidelines or calculations out there for the sizing of a vacuum breaker on a pressure vessel? The only thing I've seen are recommendations.... 1) size to pass air equivalent to the vessel volume in 1 minute (say 50 ft3 vessel - size to pass 50 cfm). 2) size based on outlet...
  11. jproj

    Design vs. Supply....

    Lets say Thor works for a design firm. A contractor/consulting firm sends Thor a request for quotation for the supply of a pressure vessel. Thor, who normally designs these vessels, determines that everything about the vessel is undersized (nozzles, tank, etc)... This is not the first time...
  12. jproj

    Blowdown Flow (Choked flow help)

    I am trying to design a flash tank, but instead of giving us the inlet flow rate, our client only provided the flash tank pressure (2 psig), boiler operating pressure (500 psig), tank size, and blowoff line size (2"), and I'm not sure how to handle choked flow of a flashing liquid (fluid...
  13. jproj

    Interphase Mass Transfer

    I am looking for some guidance in calculating the mass transfer of non-condensable gases from liquid (water) to steam. I have Perry's (7th ed.), but am not real sure how to even approach this situation (I've been looking in chapter 5 in Perry's, but I'm not having much luck). All we were...
  14. jproj

    External Insulation Temperature Specification

    Are there any specifications that deal with the maximum external surface temperature of an insulated pressure vessel? I thought that OSHA would have specified a maximum temperature for personal protection, but I haven't been able to locate anything. I think I've seen 140ºF listed somewhere...
  15. jproj

    Noise of steam through gate valve

    Can anyone point me in the right direction? I need help in calculating the sound generated from saturated steam (~35 psig) passing through a gate valve and exiting to the atmosphere. Thanks!! jproj
  16. jproj

    Heat transfer coefficient

    I am currently working on some insulation thickness calculations (trying to develop a spreadsheet) and need some help in determining a heat transfer coefficient. The tank (horizontal carbon steel) is a little more than half full of saturated liquid with saturated steam in the head space (51...
  17. jproj

    Steam Flow Through Gate Valve

    I am having trouble calculating the mass flow rate of saturated steam through a gate valve. Inlet and outlet pressures and properties (density, enthalpy etc.) are known along with orifice size (full open gate valve). I cannot figure out, however, the proper equation to use in the calculation...
  18. jproj

    Vessel Specifications

    I work for a pressure vessel design company and read many technical specifications daily. I have noticed that many companies have conservative specifications. A few that I have seen include: 1) The use of support rings (vacuum rings) is prohibited. 2) Flux Core Arc Weld is not allowed on...
  19. jproj

    Calculation of Head Weights

    I am trying to find equations for the weights of 2:1 Elliptical, Hemispherical and ASME F&D heads (without much luck I might add). To find the weight of a cylindrical shell I found the inside and outside (total) volume and subtracted to find the shell volume. I am not having much luck using...
  20. jproj

    Heat Capacity Question

    The specific heat capacity (or an equation for it) for water is well documented for both liquid and ideal gas states. What about the transition phase? Is there any way to calculate Cp & Cv for two phase water (steam & liquid)? Any advice or references are greatly appreciated. jproj

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