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  1. PPVE

    Dollar Plate

    Thanks very much for your comments, guys. In the context of the Vendor's offer, the locally thickened plate for nozzle reinforcement is the answer I need, although it's interesting that another explanation exists within vessel engineering for a similar but different application. Something for...
  2. PPVE

    Dollar Plate

    Can anybody give me a definition of a 'dollar-plate' as used for nozzle reinforcement, please? This was offered by a Vendor with no further explanation, as if I was supposed to understand his defintion - I don't want to ask him and thus appear ignorant, especially if this is a common term in...
  3. PPVE

    Vertical Vessel Skirt/Base Ring on Shims

    Thanks for your reply: It sounds plausible. However, as I have an investigative nature I'm off to see if my local Civils man understands his part in the scheme. I'll post the outcome for the benefit of others reading this post.
  4. PPVE

    Vertical Vessel Skirt/Base Ring on Shims

    In my study of the design of vertical vessels on skirts, base ring sizing appears to be dealt with adequately well, except for one practical consideration: My Civils colleagues want to place shims under the base ring for levelling purposes before flooding with grout and tightening the anchor...
  5. PPVE

    PVElite Terminology

    What is the meaning of the following expression, found in PVELite calculation output: "The Drop for this Nozzle is .... x.xxxx mm" Any helpful response would be appreciated. Regards, Ralph
  6. PPVE

    Wind loads per BS6399

    PD 5500 suggests a Kb factor of 4 or 8 when calculating wind loads per BS 6399 Pt.2, 1997. However, the default value in PV Elite gives Kb=2. Can anyone shed some light on this discrepancy, please?
  7. PPVE

    Low temperature

    Thanks for your reply cb4. Yes, I am interested in cryogenic temperatures and yes, my chosen materials do indeed have enhanced mechanical properties at the design temperature. What do the new rules say, in brief, of course? Can I take advantage of the low temperature properties? Any help...
  8. PPVE

    Low temperature

    It's a long time since I used the ASME VIII, Div.1 routine for low temperature service and I've fogotten how the code treats the Test pressure (at ambient temperature) for a Design temperature below ambient. Also, I don't have a copy of ASME VII to hand. Can someone remind me of the rules...
  9. PPVE

    Allowable stress during testing, which?

    It is only true to limit the membrane stress at test to yield for materials that have a high yield stress compared to their ultimate stress and a low value of elongation at failure, ie., brittle materials. (However, beware stress concentrations at nozzles, etc.) If you have good knowledge of...
  10. PPVE

    Has anyone built a Pressure Vessel out of Aluminum ?

    I must leave the question of thermal conductivity to those who know more than I. As to the code, I have not used ASME VIII Div 2 for a few years - I use PD5500 (was BS5500) and AD-Merkblatter, both of which have similarities to Div. 2, ie., higher allowable stresses than Div. 1. PD5500 cautions...
  11. PPVE

    Has anyone built a Pressure Vessel out of Aluminum ?

    I have designed several vessels in Aluminium Alloys, static and mobile (road tankers), mostly for cryogenic applications. Some questions come to mind: How important is the transfer of heat across the wall in comparison to the pressure retention? What is the service of your intended vessel? Which...

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