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  • Users: sxz
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  1. sxz

    Allowable Stresses, Sd/St for Titanium Tank

    HI, for titanium tank, material B-265 Gr.2, design temperature 261F, can we use the Sd at, 20,600 psi, it is 70% of its yield, 29,700psi? (ASME 8-1 has 12,400 psi). Thanks for any comments.
  2. sxz

    What design conditions are required to calculate Tmin for steel stack in service for 40 years?

    Hi, Steel Chimney Experts, I like to know what conditions should be considered to calculate the minimum required wall thickness (Tmin). 1) Original wind code 2) Original nominal wall thickness, instead of actual wall thickness measured. 3) Original allowable tensile stress 4) Original allowable...
  3. sxz

    How to calculate Tmin for steel chimney in service for 40 years?

    Hi, Steel Chimney Experts, I like to know what conditions should be considered to calculate the minimum required wall thickness (Tmin). 1) Original wind code 2) Original nominal wall thickness, instead of actual wall thickness measured. 3) Original allowable tensile stress 4) Original allowable...
  4. sxz

    Area Replacement Rule, WRC, and FEA

    Hi, I have a nozzle reinforcement calculation. As per the UG-37, the area replacement rule, Aa < Ar, it fails, but WRC or FEA results pass. Can I use the WRC or FEA result for fabrication? Thanks.
  5. sxz

    Impact Tested Without PWHT

    If a heat exchanger is made from SA-516 Gr70N, 1-1/2", MDMT at -45C for both tube and shell sides, the plate, tubesheet and nozzles are impact tested at -45C, and satisfied with energy specified, the PWHT will not be required for the exchanger. Not sure if it is true. Any comments are welcomed...
  6. sxz

    Reinforcement on flat head with variable diameters in one opening

    Hi, In the reinforcement formula of UG-39(b)(1), how to select the opening diameter, d, if the opening has variable size of diameters, say d1 (smaller) in the upper thickness of flat head, d2 (larger) in the lower which facing the internal pressure side. Do we use average diameter, dv =...
  7. sxz

    Appendix 2: Reverse Flange Design - Dimension C is close to B (=B')

    Hi, I have a reverse flange design, I am concerned that the circumferential stress 1 in the g1 area is larger than that in the g0 area due to the area reduction by the bolt hole, see the attached sketch. I think the ratio of g1/g0 should be greater than 2, then the circumferential stress 1...
  8. sxz

    Waterjet Cleaning for Coating Removal

    If high pressure water jet, 40 k psi, is used to clean the coating inside crude oil storage tank, the metal yield stress is 36 k psi, does this high pressure cleaning affect the weld/metal hardness (say 225 HBN after welding)? does the tank weld hardness have to be maintained the same after...
  9. sxz

    Up to What height is required to drill slot holes on stilling well ?

    I have a question on the large crude oil tank with internal floating roof, can we drill the holes up to HHLL? Is any evaporation loss a big concern? Or keep the holes under LLLL? Thanks for any inputs. XZS
  10. sxz

    Material selection for flare stack and seal drum at 425 C degree

    Hi, All, The elevated flare has a liquid seal drum at bottom, stack, and flare tip. 95 m high total, drum diameter is 3.6 m, stack diameter is 1.7 m. If the design temperature is 425 C degree, design pressure is 5 barg for seal drum and stack, does SA-516 Gr.70N still work because the creep...
  11. sxz

    Is ULC 142 taking place of ULC S601?

    In the UL website, there is no ULC S601? But ULC 142 for the same spec.
  12. sxz

    Time for Field Erection of Large Tanks

    Does anyone have experience in how long to erect the following tanks in Alberta? 80,000 bbl ------ 8 months? 40,000 bbl ------ 6 months? 25,000 bbl ------ 4 Months 20,000 bbl ------ 4 Months? Your input is much appreciated.
  13. sxz

    Transfer the Chemical liquid from Commercial Tote Tank to Day Tank

    In plant, using a hand pump or use a gravity drain from the elevated tote tank on platform above day tank is most common? Thanks for any inputs! Sam
  14. sxz

    Liquid Sulphur Basket Filter - How to clean it?

    Is the basket removed in hot or cold condition when the Delta P is alarmed? Is there any transfer container used during the process? Thanks for any inputs!

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