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  • Users: jharris3
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  1. jharris3

    PD pump vibration transmitted to rack

    I'm not sure if someone has addressed this issue already in a previous posting so please let me know if that is the case. Here are the details of the pumps followed by my questions Three triplex pumps in parallel with each other discharge to a pipeline. The pumped fluid is from the brine and...
  2. jharris3

    Section VIII Div 2 Compressive Loads design (EPC's vs 3-D.5 "Prager" curves)

    Which approach does compress use for compressive load design in Section VIII Division 2 when materials other than carbon and low alloy steel are considered? Does compress use External Pressure Charts from Section II subpart 3 or does compress use Section VIII Div 2 part 3-D.5 to calculate...
  3. jharris3

    Light hydrocarbons, Summer Temperatures causing gas to develop in piping

    I am an ME commissioning a small oilfield produced water filtration plant and we have some problems with gas developing in the suction lines to the pumps. I would like to know what sorts of chemical additives could be used to help the gases separate out of the produced water upstream in the...
  4. jharris3

    API 653 minimum thickness vs API 650 design thickness

    Why does API 653 provide a higher allowable stress than API 650? The equations are equivalent except for E which is = 1.0 for butt joints. The tank i am inspecting was constructed to 650 edition 9 appendix F. It was NOT constructed to Appendix A. It is 60 ft dia 32 ft tall (4 rings). t =...
  5. jharris3

    Snow loads included in PV design in Compress

    A couple years ago I had the opportunity to design a vessel that was installed at a facility in Alaska after the facility burned down. The schedule was tight with design, fabrication, and delivery to be achieved in 4 months. The tower had two chambers, extra corrosion allowance for long life...
  6. jharris3

    1949 Code Allowables

    Is anyone aware of the reasons why the 1949 ASME Code dropped the stress allowables? 1943 and 1952 had an allowable stress of 13,750 for SA-285 C for example but in 1949 the allowable was dropped to 11,000.
  7. jharris3

    Old anchor bolts for a new vessel built to new siesmic code

    A tower that is being built to the new California seismic Codes (ASCE 7-10) and ASME VIII. I use Compress software to perform my calcs because the design is conservative. I realize that there are FEA methods to reduce the size of anything with the right amount of effort, however, I don't want to...
  8. jharris3

    AO Smith layered vessels

    We are beginning an evaluation of some layered AO Smith vessels built in 1959 that used SA-225 grade B for the heads and AO 1146a for the shells that are 200 cu ft. The AO 1146a appears to be equivalent to SA-225 grade C under the modern Code. Could you direct me to a source for the weldability...

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