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  • Users: JAS
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  1. JAS

    How to reduce thickness because of Full vacuum

    Dear All, The present condition of the ALREADY FABRICATED COLUMN has FULL VACUUM with 6mm CA. The information did not pass on to the Vendor and the Column has been fabricated considering PARTIAL VACUUM. So only the top Shell course & Head fails because of less thickness (Fabricated 18mm with...
  2. JAS

    Travelling Speed of a Floating Roof

    Hello everyone, We have already discussed many times in this forum regarding the Travelling Speed of a Floating Roof. All are generic answers and based on experience. Iam designing few Tanks and was asked the Travelling speed of the Floating Roof to judge the wear & tear (including for the...
  3. JAS

    Bottom Plate thickness

    Dear All, May I know, is there any criteria in API 650, that the thickness of the Bottom plate shall be equal to the thickness of the First Shell course. Also, should the thickness of the Annular plate (if used) shall be equal to the thickness of the Bottom plate. Thank you in advance...
  4. JAS

    Shell wall thickness

    Guys, API 650 5.6.1.1 defines the Nominal plate thickness based on the Nominal Tank diameter. May I know whether, the plate thickness mentioned includes the Corrosion Allowance or without Corrosion Allowance? Example, if the selected plate thickness is 6mm (as per 5.6.1.1), should I add...
  5. JAS

    Sheet-to-sheet water assembly

    Hello guys, Iam reviewing an offer just received from a Tank manufacturer for constructing larger Tanks. Manufacturer has mentioned "to build the tank in accordance with the “sheet-to-sheet water assembly” method. He has mentioned that this method affords the advantage of filling gradually the...
  6. JAS

    Transportation of 50m (160') Pressure vessel

    Dear All, Will there be any issue of transporting a 50m PV on road by trailer on road, assuming that we have got clearance from the Transport Authority & Vendor designs for the same with transport saddle. After that, how this will be transported within the refinery plant. We need to transport...
  7. JAS

    Hello Everyone, This is regarding

    Hello Everyone, This is regarding Drain Sump (Rectangular Tank-Int: Atmospheric/Ext: Full vacuum), for which the Design code to be followed as per the FEED Datasheet is Roark’s formula and API 650. Datasheet also calls for the “Code Stamping & Registration”. As we know that Code stamping cannot...
  8. JAS

    Thermal Exp co-eff for N08904

    Dear All, Iam re-designing an existing NEN type H.Exchanger (PVElite 2016) which was commissioned in 1970's. Status: 1) Since this is NEN type, the entire Equipment has to be replaced, the change in Material being only the replacement of the Tubes from SS316L to Inconel 625 for which there was...
  9. JAS

    Thermal Exp coeff for N08904

    Dear All, Iam re-designing an existing NEN type H.Exchanger (PVElite 2016) which was commissioned in 1970's. Status: 1) Since this is NEN type, the entire Equipment has to be replaced, the change in Material being only the replacement of the Tubes from SS316L to Inconel 625 for which there was...
  10. JAS

    Sludge Tank

    Dear All, Iam designing a Sludge Holding Tank (15m ID). I need help on the confirmation of the following. 1) For a sludge tank, what is the necessity of the Sump.(sump is necessary as per Shell DEP/2 sumps as per API 650) 2) Should the slope of the Bottom plate be Cone-in or out?(Cone-out with...

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