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  • Users: Duwe6
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  1. Duwe6

    Steel Plate Quality agains Price

    CMTR's from China tend to be works of fiction. There is a good reason that that batch of plate is cheap!
  2. Duwe6

    Gas Bottle

    "And uneconomic." Yep - - high probability of a BOOM! Please have 'genius' client email his insurance provider; HELL NO is easier to read than to listen to on the phone.
  3. Duwe6

    Gas Bottle

    Most Demonstration vessels are made from big-bore pipe [seamed or seamless] and SA105 fittings, including Pipe Caps for heads. Call it a Blowdown Drum, and call the contents "mixed hydrocarbons" or something else innocuous. Do not designate contents as acetylene; that requires 'moss' filler to...
  4. Duwe6

    Leak Testing (hydro) w/o Considering Stress Ratios

    You will find the tables for c/s in Section IIA. You need to look the common materials up ASAP. The shops all have Sect. II books, and the tables don't change [since 1999]. Just ask to look at an old one.
  5. Duwe6

    Groove weld gap for re-pad

    Have you ever watched a vessel being handled? The probability of the entire weight of that vessel ending up being supported by one trunnion is not trivial. It is a very real possibility. Assuming a good fitter/welder, the extra time/cost of full-penn [vs, whst you detailed] is trivial. Poor...
  6. Duwe6

    Groove weld gap for re-pad

    ". . .weld the trunnion to the shell with whatever weld size is required. Normally it's full pen thru the trunnion wall and a fillet."- Exactly - Full-Penn the trunnion, then lower the repad and weld it into the OD trunnion weld. Look at the repad detail dwgs for API 650 nozzle repads.
  7. Duwe6

    Help required to identify markings on studs and nuts on older USA pressure vessel.

    What does the U-1 for your vessel say? [probably SA192/193 B7 studs & 2H nuts]
  8. Duwe6

    Anchor Bolt hole Sizes on Top Ring and Base Ring

    With such a huge clearance in the holes, you will need to detail oversize washers for this mess. The holes are 0.75" OS, I would use the largest size [ 3" x 3"?] washer that will fit the ring, and probably 3/4" thick.
  9. Duwe6

    Design Pressure 1440 psi - Flanges S300

    This is a Code-stamped pressure vessel. Period. The MAWP & MAWT are plainly stamped on the plate. Period. Your speculations about the flanges are meaningless. If you really feel the need to reverse-engineer this Code vessel, you will need the U-1, the design calc's, and the design...
  10. Duwe6

    Rejected for OR PE/SE because I took SE1 for the PE

    ". . . and, say, how far away from NY is NJ, anyway?" an amazingly long distance, in intangibles [such as PE standards]. Physically, the Geo Washington bridge regularly takes over one hour to cross, driving as fast as possible.
  11. Duwe6

    Quick Opening Closure For Pig Trap

    What Steve said. Quick Closures are a 'catalog item', and the manufacturer has already done the engineering for you. - ASSuming you buy from a reputable mfr.
  12. Duwe6

    Vacuum resistance of two similar vessels

    Not common to strip a vessel of it's insulation just to take a few thickness measurements - you cut 2-inch ports and measure there. Try hiring a certified API Inspector with 510 & 653 cert's. What is being discussed [and agonized over] is a typical day in the tank farm for an API. Tank or...
  13. Duwe6

    Radiography Test in PV Elite

    "T-joints' are junctions between longitudinal seams & circumferential seams. Under 'Spot' RT UW-52, they are a mandatory location for testing.
  14. Duwe6

    Wheep hole on RF pad

    Repads are pretty common for big-bore pipe supports on thin - 1/4" , 5/16" - tank walls. A liquid-filled 6NPS or 10NPS line is a substantial load, so spreading it out onto the tank shell is needed.
  15. Duwe6

    Shell plate replacement.

    Is it permissible to flame-cut new material? Yes Does flame-cut material require any special restrictions that mechanically sheared material does not? Not really; just grid to shiny metal prior to welding. If you trim off the weld plus the HAZ [HAZ will be < 0.1mm], do you think that the...
  16. Duwe6

    We want to use 1-1/2&quot; 6000# threade

    Gotta love watching someone reinventing the wheel. IMHO, O'Lets are the best for Branch Connections. These are designed & tested for this use; as opposed to guessing what plumbing item can be cut up and forced to serve as a boiler & pressure vessel item...
  17. Duwe6

    Vacuum Distillation Column Flange weight more than column weight?

    Major Quibble; pressure is External, and up to 14.7 psi. Not a trivial item.
  18. Duwe6

    SA-612 PQR

    And what is the accuracy of the machining of these 'dogbones'? If they have been cut by hand, vs. machined to +/- 0.002", have a laugh & a large adult beverage.
  19. Duwe6

    Column tray thickness and width

    In inches; 2" x 2" x 3/16" angle iron, installed "Leg out & Leg Down". Further, use these tray rings as vacuum stays in the vessel calculations. You will find that a Full Vacuum rating is available.
  20. Duwe6

    Local Deviation from the design for

    Some 'genius' has redefined the API standard 3-ft/0.9m length of the gauge board to 2.5m. Hope the tank crew is aware that their work will have to be 3x as plumb and 3x as round & smooth as the industry standard.

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