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  • Users: PVdesigner
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  1. PVdesigner

    Requirements on Column w/Seal Welded Trays

    Would anyone please shed some light on minimum design considerations required on vessel with seal welded trays? Situation: One of the tower has four (4) wash trays (bubble cap, classified as critical service trays, ) at the top section. To meet the leakage test requirement of 1” of water in 5...
  2. PVdesigner

    Offset nozzle on transition

    Hi all, Has anybody designed a nozzle, located on transition and offset from vessel centerline, using Compress ? I could not see that option anywhere in Compress. Please advise. Thanks
  3. PVdesigner

    Upper limit of hydrotest pressure on ASME Div 2 2007

    Hi all Does anybody know how to determine the upper limit of hydrotest pressure per 8.2.1.c which refers to another para. 4.1.6.2.a.2 in ASME DIV 2, 2007 A08 ? Is this mandatory to be shown on drawing or on nameplate ? Thanks
  4. PVdesigner

    ASME 2:1 elliptical head in Div 2 vessel

    Dear all, While designing the vessel (Div 2, 2007) with ASME 2:1 elliptical head, if the L/t ratio per 4.3.7.1 is lesser than 20, what kind of analysis is required to conform to part 5 ? I have a 36" OD vessel with 2" wall thickness and this ratio (L/t) comes out to be 19.16. Thanks for you...
  5. PVdesigner

    Minimum test pressure

    Hi All For a clad vessel with low liquid head, MAP & MAWP difference is very small. This vessel is to be hydro tested per UG-99C (horizontal position) and shall meet future hydro test requirement (in vertical position) per UG-99b. Calculated shop test pressure per UG-99C came out to be less than...
  6. PVdesigner

    gusset design for nozzle

    Hi all Can anybody please guide me in the design of gussets(stiffener) for a nozzle ? Any relevant papers ? Thanks in advance
  7. PVdesigner

    Lifting Lug Material Allowable stress

    I am curious to know why allowable stress for lifting lugs are matched with that of shell or head ? Aren't we required to use the allowable stress @ normal atmospheric temperature i.e 70F or MDMT as vessel rarely experiences design temperature while being lifted ? Thanks
  8. PVdesigner

    Fatigue Calc in Div.1 vessel

    Hi All If I was to run the fatigue analysis for the the nozzles vessel that is designed with DIV I code and oscillates continually between two different pressure at certain time interval, how do we run fatigue analysis ? I have not seen anything like this before for a div 1. vessel. please...
  9. PVdesigner

    Tilted nozzle on head

    Is is possible to design a nozzle on head offset by XXX" and 45 degrees to the vessel longitudinal axis ? This is very common situation while designing a vertical reactor with dump or withdraw nozzles on the bottom head> Thanks in advance.
  10. PVdesigner

    Skirt Opening/Access Reinforcement

    Hi all Would anybody please give me the design basis on the skirt access/opening reinforcement on vertical vessel ? How the reinforcement is calculated ? Any good reference material or book related to this topic ???? Thanks in advance.
  11. PVdesigner

    External Surface Area Of Vessel

    Hi All Is there any any to find out the total external surface area in Compress Calcs Report? Thanks
  12. PVdesigner

    special forging Boot design

    Can anybody pls suggest me how to design a forged boot with SA516-70 ( plate neck ) welded to it ? I know how to design a special forging boot, boot being 5 feet long, it requires neck to be designed with SA 516-70 plate. I would appreciate your support and ideas. Thanks.
  13. PVdesigner

    Local stresses for attachment inside the cylinder

    Hi all I am wondering if we can we do local stress calc. for the attachemnt welded inside the shell per WRC 107 "local stress in spherical & cylinderical shell due to external loads". Calc is to be run for the bed support beam clip welded to I.D of shell. I have found that this bulletin...
  14. PVdesigner

    Beam Classifiaction

    Hi all, though i am not a structural engineer, I came accross a weird problem. Case I. When a beam is attached to the inner surface of a cylinder (100" I.D )by means of Clips ( Gusset Plate ) and bolts, on both side , can we consider it as a fixed beam ? Beam doesnot have any seating. Case...
  15. PVdesigner

    Minimum Material Thickness

    Hi All When the vessel specification calls for minimum material thickness (e.g 5/16" + Corrosion Allowance ), does it apply to minumum head thickness too? Any comments.Thanks
  16. PVdesigner

    RT-4 & Compress Calcs.

    Hi All I've got the (100' Tan-Tan) vessel whose radiography is required to be RT-4. All the category A & B welds require spot X-ray except the bottom 30' that require full X-Ray. Setting summary of compress shows me RT-3 which i couldnot understand why. Any ideas???? Thanks
  17. PVdesigner

    Load distribution on Bed suppport Beams and rings

    Hi all Can anybody please give me idea how the loads are distributed on Beams and Support rings inside the reactor. For example Total load including catalyst is 25 psi and man weight of 200 lbs as concentrated load. Neglect pressure drop. Two I beams at 2 feet each other distance being attached...
  18. PVdesigner

    color setup

    Hi all Is there any way i can change the background of the compress window? I would like to create a white background as in older built instead of blue so that details are clearly seen.Thankyou
  19. PVdesigner

    Skirt stiffner beam sizing

    Hi all Can anybody suggest me a good reference book or articles related to sizing skirt stiffner beam, calculating local stresses at tail lug? Thanks
  20. PVdesigner

    allowabe stresses for bolltings

    hi all How do we determine the allowable stress values (i.e allowable stress for shear, bending & bearing) for SA325 bolting being used at 550F. ASME Sec. II D gives yield stress of 81 ksi and allowable stress 23000 psi but i am not sure about the exact figure. these bolts are used in bed...

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