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  • Users: BPVFEA
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  1. BPVFEA

    Is it correct to use Ambient Temp as Lowest Temp in Sps ?

    As per Cl. 5.5.6.1.d of ASME Sec. VIII Div 2, "The allowable limit on the primary plus secondary stress range, Sps, is computed as the larger of the quantities shown below. 1) Three times the average of the S values for the material at the HIGHEST & LOWEST temperatures during the operational...
  2. BPVFEA

    Div-2 Safe Pressure thickness fails in combined load calculation

    Hi, I am referring to ASME Sec VIII Div 2 Ed 2007 Add 2008 I calculate the safe pressre thickness of cylindrical shell by clause 4.3.1 t=D/2(exp(P/SE)-1) Now I go to Cl 4.3.10.2 to calculate the stress under combined loading. I take only pressure load . (No moment, force, weight etc.) I am...
  3. BPVFEA

    UHX for Tubesheet design of Div. 2 Heat Exchanger

    We have designed exchanger with Div-2 Ed 2004 with ASME CODE STAMP requirement. Since Div-2 does not give Tubesheet thickness calculations, we had performed calculations with Div-1 UHX which is conservative approach. But the PE is insisting to do FEA becuase Div-2 does not allow anywhere to use...
  4. BPVFEA

    Tubesheet Design for Div-2 Ed 2004 Code Stamp Job

    We have designed exchanger with Div-2 Ed 2004 with ASME code stamp requirement. Since Div-2 does not give Tubesheet thickness calculations, we had performed calculations with Div-1 UHX which is conservative approach. But the PE is insisting to do FEA becuase Div-2 does not allow anywhere to use...
  5. BPVFEA

    ASME DIV-2 "STRESS INTENSITY" or "VON MISSES EQUIVALENT STRESS&qu

    1) Refer Following Clause from Div-2 ""5.E.6.1 a) General Primary Membrane EQUIVALENT STRESS (Pm) – evaluate the through thickness stress distribution from the numerical analysis of the equivalent plate for mechanical plus pressure loading. The membrane stress is determined by linearization of...
  6. BPVFEA

    What is Major structural discontinuity?

    I am referring to Cl. 4.3.10.1(b) of ASME SEC VIII Div 2 Ed. 2007 which mentions terminology "Major structural discontinuity" I would like to know, 1) What is the definition for the term "Major structural discontinuity", and 2) Is nozzle in a shell can be called as "Major structural...
  7. BPVFEA

    Allowable from 1A for Stress Analysis ?

    We are frequently facing this situation. The Vessel as per Div.1. Since some part of it was not possible to Design By Rules we carry out stress analysis by Div-2. We linearise Von Misses stress and compare it with allowable from table 5A (Von Misses allowable). However customer/third party...
  8. BPVFEA

    (?1+?2+?3)?4S criteria in new ASME Div. 2

    I am confused with this clause. Please help me out. In Cl. 5.3.2 of new ASME SEC. VIII Div 2 (2007), for 'Protection against local failure' it is stated that "Following Elastic analysis criterion shall be satisfied for each POINT in the component. The sum of the local primary membrane plus...
  9. BPVFEA

    STRESS IN WELD ROOT OF CS & LS.

    A pressure vessel (ID 710mm,THK 8mm,tangent length 1290 mm) with torispherical ends is having (1) one CS (full penetrated, single V, 3mm root gap, without back strip) welded from inside, (2) one LS (full penetrated, single V, 3mm root gap, without back strip) welded from inside and (3) one CS...
  10. BPVFEA

    DIFFERENCE BETWWEN TIE ROD & TIE BOLT

    Could you please tell me exact difference between tie ROD & tie BOLT ? Thanks in advance.
  11. BPVFEA

    Automatically opening file while starting.

    Hi, I am regular user of PC.I have written one file in Microsoft Excel(Which gives daily time-table).I want to open this file automatically when i start and shut off the system (e.g. login box opens automatically while starting the system).Could anybody please explain me,what changes should i do...
  12. BPVFEA

    Relief hole & tell-tale hole in PV

    Hi.... 1)What is the basic difference between relief hole & tell-tale hole? 2)Compensation pads are provided with tell-tale holes & not with relief holes.Is it right? Please describe. 3)What is the recommended size of tell-tale hole? Please let me know about useful information available on the...
  13. BPVFEA

    Flange & Flat Head Thickness of PV

    Hi.. I am reviewing one pressure vessel design.Vessel is having two flat heads.Two slip on flanges are welded to shell.And flat heads are bolted to these flanges without gasket.Material of head and flange is same. If head of thickness t is safe for this application,can i conclude directly that...

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