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  • Users: Ehiman1
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  1. Ehiman1

    Blind Threaded holes tubesheet

    Hello, I have a heat exchanger where tubesheet has blind threaded holes where a flange is bolted. Does it necessary to calculate the length of the threaded holes in the tubesheet? It doesn’t exist a formula in tubesheet chapter to check it according to ASME. Can we follow good engineering practice?
  2. Ehiman1

    Wrong commercial clarification cost impact

    Hello, I am a young project manager and I have a problem with a client because of wrong commercial clarification during bidding phase. Unfortunately commercial guys confirmed for installation of steel platform without considering the price for this. This involves 20.000 € don’t considered in our...
  3. Ehiman1

    Differential thermal expansion between stainless steel flange And low alloy steel bolts

    Hello, I have a heat exchanger flange in stainless steel with bolts in low alloy steel at high temperature (400 C) and camprofile gasket in stainless steel. The code is ASME VIII div1. We checked the flange with appendix 2 and then with ASME PCC-1 appendix O to check the joint against leakage...
  4. Ehiman1

    ASME pcc calculation required?

    Hello, I checked a girth flange of a heat exchanger in accordance with ASME VIII div1 appendix 2, as per project specification and everything is verified, but if I check the flange with ASME PCC-1 appendix O as well, the verification isn’t ok. Bolts are not enough to seat the gasket. In this...
  5. Ehiman1

    Stress due to thermal expansion connecting nozzles

    Hello, I noticed a client request that we never had before regarding calculation of stacked heat exchangers. We have two AES type in stacked and client asks to calculate the stress due to Thermal expansion of connecting nozzles, does someone can help me? In other projects clients never asked to...
  6. Ehiman1

    Gasket particular shape - calculation

    Hello guys, I have to calculate a bolted joint with two welding neck flanges against high pressure with a particular gasket that I never used. This gasket has trapezoidal shape and I would like to know if it exists a calculation for this type of gasket. Code is EN13445 and pressure is 280 barg...
  7. Ehiman1

    Material in creep range

    Hello everyone, I am checking a calculation of a pressure vessel, where the operating temperature is 480 C and design temperature is 510 C for SA-387 gr.11 cl.1. In this case In accordance with ASME code the design temperature for this material is in creep range, so in my opinion design...
  8. Ehiman1

    Mawp UG-99 note 35 and B16.5 vs appendix 2

    Hi everyone, I have a unusual case, with a small pipe with two flanges ansi b16.5 3” #300 and two blinds (equipment ASME VIII div1 stamp). Pressure is 8 barg and temperature 70 C material Carbon steel. In this case I need to verify standard flange against external loads with UG-44b and...
  9. Ehiman1

    PED 2014 water temperature

    Hello, I can’t find in PED 2014/68 UE legislation where water is considered as gas only at temperature higher than 109 C and not from 100 C. Does someone can help me please?
  10. Ehiman1

    Motor support inside pressure vessel

    Good morning, I have to calculate thickness and bolts size of a motor support plate welded inside a pressure vessel shell course with ASME code. The support has circular shape and a hole at the center with the motor bolted on plate by 12 bolts 1” type (like that ones on reverse flange). In this...
  11. Ehiman1

    LWN with appendix 2 MAP lower than MAWP

    Dear gents, I have to check a long welding neck 2” #300 with corrosion allowance (3 mm) and external loads with ASME appendix 2, but doing so I found that MAP is lower than MAWP. The required thickness is 20.3 mm and with LWN standard we have 20.7 mm. I don’t understand how it is possible that...
  12. Ehiman1

    MAWP limited by nozzle parts

    Hello everyone, I am designing a heat exchanger and I noticed that Mawp is limited by nozzle flange on shell side and a vent from tube side. In accordance with API 660 nozzle reinforcement (reinforcing pad) Can not limit Mawp but in this case the mawp is limited by a flange and a opening. Do you...
  13. Ehiman1

    Rectangular nozzle under external loads

    Dear gents, I have a rectangular nozzle welded to a circular shell and our client asked to us to verify the nozzle shell junction under external loads and if a reinforcing pad is necessary with ASME code. The problem is that the nozzle is rectangular and I don t have code rules for this type of...
  14. Ehiman1

    Nozzle verification EN code

    Hello, I have a huge nozzle 80” diameter on a vessel 120” diameter that I calculated with EN 13445. The verification involves the reinforced area of the opening only against internal pressure. In order to satisfy the verification I used a reinforcing Pad 95” diameter (all components have the...
  15. Ehiman1

    ASME PCC Pmax interpretation

    Hello everyone, I noted that Compress used Pmax = Mawp in the ASME PCC-1 calculation for main flanges. In ASME code Pmax = maximum design pressure and because of this reason the verification on Compress is too restrictive to me. Does anyone noted this different software interpretation? Thank you
  16. Ehiman1

    Validate stress nozzle shell junction fea

    Hello, I am trying to validate the stresses from fea analysis close to nozzle shell junction and I would like to know which formula you use to compare these values and validate the analysis. Do you use wrc 537, 297 values or calculation by formula as per Asme Viii div2 to compare the output...
  17. Ehiman1

    Nozzle loads review after course

    Hello everyone, I took part in a course a couple of weeks ago about how to consider nozzle loads in calculation and they told me that Pb load is always secondary load when I study nozzle shell junction but I don t understand very well because from Asme code div 2 I understand that’s true only if...
  18. Ehiman1

    External loads on standard flange

    Hello, I need to check the flange rating of standard flange to external custom loads (Dead loads and Wind loads). I understand that I need to apply and axial load and an external moment but I don t understand which Moment to use with UG-44(b). The combination sqrt (Mx^2+My^2) is one solution...
  19. Ehiman1

    Fatigue analysis Course

    Hello, Does someone know a good online course or a good book to understand better the fatigue analysis in pressure equipments? For example fatigue analysis due to cyclic loads on nozzles by ASME code. Thank you
  20. Ehiman1

    Parameter Z for fixed tubesheet - EN 13445

    Hello to everyone, When you design a heat exchanger with fixed tubesheets in accordance with EN 13445 you can find a parameter Z: Which is the correct value for this parameter? I have channel flanged with tubesheet welded to the shell on each side. Is it more correct to design with parameter Z...

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