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  • Users: CuMo
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  1. CuMo

    Overlapping weld seams - ASME VIII-1 2019 - Lethal Service

    I've been trying to find further information but so far not successful. As far as my knowledge goes: it is permitted to fillet weld a nozzle reinforcing pad on top of a main circumferential or longitudinal butt weld seam (Type A or B) provided the main seam is first 100% X-Ray examined and the...
  2. CuMo

    Light Shell Stiffener Ring abutting Manway neck / PD5500

    Hello folks. I'm struggling with the following situation. I have a big diameter thin walled stainless steel vessel with light stiffening rings for the shell cylinder. Full Vac design condition is present of course. Our client has requested a specific position for the manway so that one of the...
  3. CuMo

    Tubesheet to shell joint / Leak Detection / Lethal service / ASME VIII-1

    Hi All, I've been asked to start design on a vertical BEM heat exchanger to ASME VIII-1 / TEMA-R / PED where the following conditions apply: Shell side: Cooling water Tube side: Toxic fluid / Gas (Not 100% sure whether liquid or gas, or mixture of both) - Lethal service Material both sides...
  4. CuMo

    Inconel 625 N06625 - Elevated temperature use

    Has anyone had experience designing at the upper temperature limits of ASME VIII-1 ? I have an inquiry for a few BEL type tubular heat exchangers where the tubeside has to be designed for 900 deg C (~1650 deg F) flue gas. Potentially this temperature can be lowered if we opted for the use of...
  5. CuMo

    Fixed tubesheets with eccentrically allocated tubes

    Hello all, I have been asked to design a replacement waste heat boiler to ASME VIII-1 where the ends act as tubesheets and somewhat vice versa. Probably this could illustrate things a bit better: https://exotech.nl/images/c1.505:1/uploads/pictures/147_1.whb-3d.png?1452257628 I've also drawn a...
  6. CuMo

    Super Duplex UNS S32750 Cold Forming & Post Weld Heat Treatment (ASME VIII-1)

    Similar topic discussed previously here but I'm still a bit unsure. https://www.eng-tips.com/viewthread.cfm?qid=375032 We have a 12"NB pipe spool made from Super Duplex UNS S32750. Due to cost implications we would like to roll it from 10mm thk plate. If I work out the resulting strain as per...
  7. CuMo

    RFWN vs RFLWN Cost of manufacture

    I was designing a replacement vessel where the flanges of the existing vessel were RFSO which allowed some compact design. For the new vessel however the client has specified that RFSO are no longer acceptable and only RFWN or RFLWN are acceptable. If I tried to substitute two of the main 20"NB...
  8. CuMo

    Question regarding Yield Strenght at elevated temperatures

    Is there a method which could help determine Yield strenght of material (Ferritic alloy steel) at elevated temperature if only Yield strength at room temperature is known? Or if I rephrase it: If we have a piece of steel where Yield values are known from 0 to 1000 deg C would the trend of Yield...
  9. CuMo

    PWHT of ASTM-A336-F11-3 Heat Exchanger in accordance with PD5500

    Hi all. We are designing a BEU heat exchanger to PD5500 where shellside cylinder, tubesheet and shellside dished end are forged from ASTM-336-F11-3 (UNS K11572). Tubeside channel is a known territory so nothing to worry about here. Due to thickness shellside components are subject to PWHT...
  10. CuMo

    Hanging Bundle

    Hello all! It's been a while since I last visited. Anyway. Straight to the topic. I am designing a 20" NB reboiler from scratch (I am doing just the mechanical bit). The exchanger is vertical and the shellside inlet N3 is located near the top tubesheet as it can be seen from the drawing...
  11. CuMo

    Stainless steel vs alloy steels?

    Hi guys I need to reed this forum more often as there is such tremendous amount of useful information for the designer but there I am - still not created a habit as I'm too tired to read it after work. Anyway. I was designing a flange today and due to the size of the bolts I went to read...
  12. CuMo

    Missing Stress Values in ASME II Part D

    I had an enquiry from client where the shell material is requested to be: ASME-SA387 Gr9 Class 2 UNS K90941 This material exists under its own specification in ASME II Part A but no Stress values seem to be shown in ASME II Part D. The only closest thing available as plate is SA387 Gr 91 Class 2...
  13. CuMo

    Question regarding Heat Exchanger Nameplate

    I've seen a U-Tube Heat exchanger designed to EN13445 to have a nameplate which contains the field: TYPE/SIZE: BEU / I/DIA x STRAIGHT TUBE LENGTH Where is this derived from? Is this any old ASME Practice because I can't find any info about it. What is the practical benefit of having the I/D...
  14. CuMo

    How was PED/97/23/EC test pressure coefficient 1.43 derived?

    I couldn't find another topic for this so here's the question. Does anyone know how was the hydro test coefficient of 1.43 in PED/97/23/EC derived and why? Why not 1.42 or 1.44 for example? Where did that 1.43 come from? Just curious. Thanks! Here's an extract from PED/97/23/EC Hydrostatic...
  15. CuMo

    Problems with 2" Welding Neck Nozzles

    Dear Sirs, I am new to this forum, so please excuse me in advance if this question has been discussed before. I cannot find the information needed whatsoever. I am a total newby in vessel design (22 y.o.) so I am still experiencing difficulties in designing vessels. OK. Here is the problem...

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