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  1. ElCidCampeador

    'Set-in vs set-on' strikes back!

    Hello, I've read many threads in this forum about set-in/set-on nozzles and what is the "best" solution for a pressure vessel. I usually design according ASME VIII Div.1 but this code seems not to suggest a preference for a insert or a set-on configuration as long as you follow figure UW-16...
  2. ElCidCampeador

    Creep design - EN 13445

    Hi, I'm designing a pressure vessel, O.D.1800mm, height=4500mm, mat. SS316 acc. to EN 13445. Vessel has 2 shells (upper&lower) which are connected by a body slip on flange made by plate. Lower shell is 2,5m, higher shell 2m. Shells are welded to 2 elliptical heads (at bottom and at top) with...
  3. ElCidCampeador

    Thermal oil heater

    Hi, would like to know thermal calculation for a thermal oil heater like this one: https://www.abco.dk/English/CustomisedBoiler/ThermalOilHeater/ Is there a simplified method to calculate the surface temperature of the outside wall of the coil? What parameters are necessary to know? Flame...
  4. ElCidCampeador

    How to design this saddle

    Hi, I'm trying to understand what kind of design check I've to do for a saddle of a pre-existing pressure vessel here below sketch shown: Saddle is bolted to the ground/structure through 4 bolts. The only force to consider is there shown (weight included). I suppose that base plate undergoes...
  5. ElCidCampeador

    PFHT of nozzle already welded

    Hi, a friend of mine, who works in a workshop, is asking me if he can do something for this issue. He is building a pressure vessel acc.to EN 13445, Gr.1.2 (c.steel). This vessel has a shell with a nozzle bended from plate; this nozzle is welded to the vessel with a set-in weld and has a...
  6. ElCidCampeador

    PFHT Solution annealing with different time/temperature of base material

    thread292-481216 Hi, I've a similar question of thread below. In this case I have 2 different spheres mat.316, 30 and 35mm, whose starting disks (cut from plate) will be hot formed and then solution annealed with PFHT. In the first one mill certificate, base material was solution annealed at...
  7. ElCidCampeador

    Increase thickness of raised face of a flange

    Hi, suppose that you have a flange in contact with its identical counterflange, both special WN raised faced with RF thickness=2mm. Suppose also a spiralwounded gasket between the two. This configuration could be easily designed using ASME VIII Div.1 appendix 2. Now suppose, keeping the other...
  8. ElCidCampeador

    Special flange...or not???

    Hi, one of my clients wants to rebuild a small pipeline of a old project ('80 years), which consists of a tube from rolled plate and welded at the both ends 2 flanges as sketch below: These flanges are welding neck and they also have a small strange cave for O-Ring gasket, as you can see...
  9. ElCidCampeador

    EN 1759 flange for PED (instead of B16.5)

    Hi, I have to design a vessel according to EN 13445+PED; previously this vessel was designed according to ASME VIII DIV.1. I have to use ASTM material + PMA. Vessel is in stainless steel material and is very simple, a shell from plate with 2 elliptical heads at the ends with some nozzles and...
  10. ElCidCampeador

    How to correct misaligned flange with torque wrench

    Hi, my client is contesting me a vessel that I built (pressure vessel acc. to ASME VIII Div.1) because he is not able to connect correctly it to his piping line. Here below what my client has measured (different height gap about 3mm): I ask you if it's possible to fix it by pullings tie...
  11. ElCidCampeador

    Welded smoke pipe

    I was told that for water bath heaters, like these: https://www.gasco.net.au/wp-content/uploads/2017/11/Todd_Energy_Water_Bath_headers.jpg smoke pipes used in it are commonly welded, especially if they are very long and longer pipes from stock aren't available. But when I try to ask if there...
  12. ElCidCampeador

    Weird sounds during pneumatic test

    Hi, a friend of mine who works in a workshop has told me about a strange fact happened during a pneumatic test of a stainless steel "transition piece". This transition piece is a short section of pipe (lenght about 1m) with 2 flanges ad the end, but at small end both section and flange are...
  13. ElCidCampeador

    Figure UW-13.2 with corner joint not 90° angle

    Hi, regarding ASME VIII Div.1 Fig.UW-13.2, for example (c), is it possible to weld a corner joint with angle different from 90°, e.g. 100° or 80°? Is there an interpretation or is it strictly forbidden? Thank you
  14. ElCidCampeador

    Outside weld between nozzle and jacket

    Hi everyone, I'm designing a jacketed vessel, material carbon steel, according to ASME VIII Div.1. Condition: Shell pressure: 15 bar/FV, Thk. 18mm Jacket pressure: 5 bar, Thk. 10mm Please look at figure here attached. What is the minimum dimension of throat of that fillet weld, according to...
  15. ElCidCampeador

    External loads on flanges and UG-44(b)

    Hi, I have a nozzle (seamless pipe+standard WN acc. to B16.5) designed acc. to ASME VIII Div.1 with external loads acting at shell/nozzle intersection and checked acc. to WRC. Question: Does UG-44(b) apply? I mean, loads are acting not directly at flange joint, so may I assume "External loads...
  16. ElCidCampeador

    Cladded flanges

    Hi, in an archive I've found a drawing of pressure vessel, design acc. to ASME VIII Div.1, where flanges are cladded as in the sketch here attached: Flanges adopted were standard acc. to B16.5, mat. carbon steel, but raised face is completely removed (and also material from the inside body...
  17. ElCidCampeador

    A 300° arc of skirt by formula

    Hi, how is it possible to calculate a skirt of a vertical pressure vessel (designed acc. to ASME VIII Div.1), where the skirt is not completely welded to the vessel for 360° but only for 300°? Skirt is a rolled plate but hasn't longitudinal seam because edges are not welded to each other...it's...
  18. ElCidCampeador

    A350 LF2 ISO 15608 group 11.1??

    Hi, according to table QW/QB-422 of ASME IX, A/SA 350 LF2 is classified acc. to ISO 15608 as group 11.1. In table 1 ISO 15608, Group 11.1 refers to Steel covered by group 1 except 0,30%< C <=0,35%. But if I look at chemical requirements of table 1 SA 350 LF2, ASME II PART.A, Carbon content...
  19. ElCidCampeador

    Tube-to-Tubesheet PQR impact test

    Hi, I have a tubesheet Thk.120mm Mat. SA 266 Gr.2 and a tube D.25,4 Sp.2,22mm Mat. SA 179 welded to it as for a classic heat exchanger tubeesheet (fig. UW-20.1(d)). Acc. to ASME VIII Div.1 design calculation tubesheet requires impact test @ MDMT but tube is exempted. Question: does PQR of...
  20. ElCidCampeador

    UNI flanges face finish

    Hi, what is the purpose of the 3 big concentric grooves on face of UNI flanges? What are the differences with phonographic one? Thank you

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