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  1. men8th

    NB-2540 examination of forgings

    Thanks for your help JR97, that makes sense now.
  2. men8th

    NB-2540 examination of forgings

    I have a forged pressure vessel head. If I invoke ASME III NB-2540 for examination of forgings and opt to use ultrasonic examination in accordance with NB-2542, the acceptance standards seem very vague. The first thing that NB-2542 does is invoke Article 5 of Section V of the ASME BPVC. That is...
  3. men8th

    Nozzle loads reacted through heat exchanger girth flange

    Thanks SnTMan, think we will pursue this, possibly with dowels or keys to take the shear.
  4. men8th

    Nozzle loads reacted through heat exchanger girth flange

    Thanks for your suggestions all. In case it helps, to clarify: There is metal-to-metal contact between the tubesheet, channel and shell. The seal is not a gasket in the traditional sense. We have experience with a similar design which has been in-service for a long time so at least there is...
  5. men8th

    Nozzle loads reacted through heat exchanger girth flange

    We are in the process of designing a large heat exchanger. It has two fixed tubesheets, for example TEMA type AEL. The tubesheets are "loose" and sandwiched between girth flanges on the shell and channel, similar to the image below. The nozzle loads on the channel are considerable and the...
  6. men8th

    Valve bridgewall markings on P&IDs

    Dear all, I'm after some insight as to what is considered "normal" in your organisations for showing valve bridgewall markings on piping schematics/P&IDs. Is this information always shown? Sometimes shown? Never shown? Also, what symbols are used? Arrows? The cranked bridgewall marking...
  7. men8th

    Pressure vessel nozzle made from plate

    Thanks for your opinions all. Confirms my initial thoughts.
  8. men8th

    Pressure vessel nozzle made from plate

    I have a supplier who is proposing to make the nozzles on a pressure vessel from thick plate, eg by boring the plate into a pipe shape. I can't find anything to specifically prohibit this in the code, but I don't think it's right because of the possibility of defects and segregation down the...
  9. men8th

    Visual examination required by ASME III

    A quick search for "visual" in ASME III generates precious few hits - basically the code seems fairly silent on the matter. On the other hand, I expect visual examination to be used liberally, especially for welds. Am I missing something?
  10. men8th

    Pressure-bearing parts other than main pressure-bearing in the Pressure Equipment Directive

    Thanks @XL83NL. I've read that post and a couple of similar ones but it's not really giving me the clarity I was looking for. I'm really struggling to decide really if there are any parts, "main pressure-bearing" or "other than main-pressure bearing" where there is no need to get a 3.1 cert. As...
  11. men8th

    Pressure-bearing parts other than main pressure-bearing in the Pressure Equipment Directive

    If designing a vessel or piping under the Pressure Equipment Directive (PED) using EN13445 or EN13480, requirements for material certification (3.1, 3.2, 2.1 or 2.2) are given in EN764-5. In EN764-5 is a flow chart which defines the requirements for "main pressure-bearing parts" and...
  12. men8th

    Depth of boiling liquid and measurement of void fraction in tank

    Dear all, A couple of simple questions which I'd welcome your opinion on... I have a process vessel which is partially filled with a single component saturated liquid. Above the saturated liquid is vapour. Occasionally, due to an upset, the pressure in the vapour space is rapidly decreased. The...
  13. men8th

    Check if selected entity is part of a surface body or a solid body

    Hi, I am trying to write a macro to determine if an entity (face, vertex, surface etc.) which a user has selected is part of a solid body (ie an item which is a member of the solid bodies folder at the top of the feature tree) or if it is part of a surface (ie an item which is a member of the...
  14. men8th

    Boiler feed stop check valve

    Thanks for your answer, however I don't think my original question was clear enough. Working back from the boiler towards the feed pumps, B31.1 122.1.7(B.1) requires a stop valve closest to the boiler, and then a check valve. On a boiler I've seen, the line was arranged with a stop valve at the...
  15. men8th

    Boiler feed stop check valve

    Iaw B31.1 para 122.1.7(B.6), why can a combination stop check valve on the boiler feed line be considered only as a stop valve?
  16. men8th

    Globe check and stop check valves - pros and cons

    Thanks for your kind reply. I'll continue to pursue this with the manufacturers we have on our approved vendor list. To be honest, I'm not getting much help from them beyond "you might want to put it on a flow bench and check the performance before you install in the system"...
  17. men8th

    Ball Valve Inside Groove

    You have made it clearer. I've learnt something new today...
  18. men8th

    Ball Valve Inside Groove

    I'm not sure the fluid filling the grooves will stretch the seat passist. Each groove has a front and back face of equal areas. When the valve is pressurised, the force exerted on the front face of a groove will equal the force on the back face and the net result will be no movement.
  19. men8th

    Globe check and stop check valves - pros and cons

    Thanks for your considered reply Danlap. The system in question has a very high turndown ratio. I wonder if you have any guidance on sizing. (I wrote another post so apologies for asking the same question here.) I'm concerned about valve flutter/instability at low flow rates, but at the same...
  20. men8th

    Size check valve

    Hi valve experts, I have a system with a high turndown ratio. We will use globe check and stop check valves in a couple of locations. I can find very little literature on how to size these check valves to ensure that they are fully open, or at the very least acceptably open, at low flow rates...

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