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  1. JakeR82

    PG-32 K excess

    I believe you are supposed to limit the value of K to 0.99 in your calculations. Meaning if you have K under 0.99, use that, otherwise use 0.99.
  2. JakeR82

    Hydro Testing of Slip-On Flanges

    I just called our typical code AI about the issue. The entire piping system includes any flanges. It is also a pressure weld, and I drew it out to explain. Typically what they do is weld another cap on it that has a hole to put the water in the system with a air valve to the side. The unit...
  3. JakeR82

    Hydro Testing of Slip-On Flanges

    @Btrueblood: "ASME B31 would have you hydro test the flanges" The way I read this statement means that all flanges are required to be hydro tested. Is this correct?
  4. JakeR82

    Hydro Testing of Slip-On Flanges

    I recently argued with my QA department about hydro testing Slip-On flange to a pipe. It is my understanding that all welds must be hydro tested, even though the slip-on flanges partially cover the pipe and one of the welds isn't a boundary weld, while the other is a fluid boundary weld. (We...
  5. JakeR82

    Why is the lower thickness limited for Impact Tested Welding Procedures?

    I would initially think that the Surface area per volume ratio is greater on the smaller thicknesses which should result in faster cooling.
  6. JakeR82

    Does shell thickness vary in ASME Sect VIII Div. 1 U-stamped Vessel ?

    @XL83NL: I talked with my AI. If vessel has been stamped the nameplate is a code plate and the AI would have looked at it. The AI must witness the nameplate being taken off and the new one put on. You will need to fill out a form in section 5 (PART 2) of the National Board Inspection Code...
  7. JakeR82

    Does shell thickness vary in ASME Sect VIII Div. 1 U-stamped Vessel ?

    @XL83NL: Our AI will be in for a visit tomorrow. I will let you know what I find out.
  8. JakeR82

    Does shell thickness vary in ASME Sect VIII Div. 1 U-stamped Vessel ?

    @ XL83NL: I could ask our AI if you want. She would help clarify what could be done.
  9. JakeR82

    Selection of Curves to use in WRC 537 (WRC 107 with curve fits)

    Hello, My company recently bought the books for WRC 537, which is identical to WRC 107, and I am familiarizing myself with the calculations. My question is during the selection of Nx*T/P and Mx/P, ect...which graphs are appropriate to use? The table listed gives graphs for some standard...
  10. JakeR82

    Does shell thickness vary in ASME Sect VIII Div. 1 U-stamped Vessel ?

    No, If the vessel is designed to VIII there is no difference at all in the calculations/thickness between building it and building it code stamped (U-Stamped). The difference comes from the inspection/quality procedures to be done to the vessel and the items the Authrozied Inspector needs to...
  11. JakeR82

    Employer fired most of the engineering staff, time for a new job?

    I actually am acting like the engineering senior. I've layed-out the department plans for the year, have started looking at document control programs and implementations. I'm looking at re-writing the design standards (most because they no longer exist). However, I've asked for more people...
  12. JakeR82

    Application of Mill Tolerance in Pipe Wall Thickness Calculation from ASME B31.3

    I deal with VIII and B31.1 a lot. The way you can look at it is this. Calculate the required thickness for the pressure boundary of the pipe. T = (P*OD)/(2(S*E*W+P*Y)) + CA where CA is corrosion allowance Add in the mill tolerance (12.5%). This can be done to either side. Tr = T/0.875...
  13. JakeR82

    Employer fired most of the engineering staff, time for a new job?

    Hello, I was hired at my company about a year ago as a mechanical/thermal design engineer. Long story short, there was a good engineering department of the company 3 years ago. Then management had the idea of moving the engineering to overseas, which has proven to be a very bad decision. So...
  14. JakeR82

    UCS 66 Cold Design Temperature and Charpy Testing

    I am looking over a proposal for our company regarding a pressure vessel. The customer is stating that A516 Gr.70 does not need to be Charpy tested with a thickness less than 25mm for a design temperature of -50°C. I look at VIII Fig. UCS-66M and the lowest that A516 Gr.70 goes is to curve B...
  15. JakeR82

    Perforated plate as a flow conditioner

    My only help with the perforated plate thickness would be ASME VIII ligament patterns. It has the efficiencies for hole spacing, and I would assume you could apply those efficiencies to the plate thickness calculations. However, you might not be able to.
  16. JakeR82

    Difference between attemperator and desuperheater

    My company makes desuperheaters, and there is a difference only in the way you wish it to be. It is basically saying, all desuperheaters are attemperators, but not all attemperators are desuperheaters. It is just how the individual wishes to classify the product.
  17. JakeR82

    Is it a pressure vessel if it contains a solid instead of a liquid or gas?

    It does not sound like a pressure vessel. A pressure vessel as a general meaning is any pressurized container (ie, piping or container) that has an internal/external pressure over 15psi. 15 psi (or generally one atmosphere) is what most technical standards use as a pressure minimum.
  18. JakeR82

    Nozzle location on Horizontal vessel

    A good example of the reinforcement needed for off center line is in ASME appendix L, example 7.7. You have two planes you will need to analyze.
  19. JakeR82

    Number of times you can PWHT P91

    My company that works with team has found that PWHT up to about 3 times until the hardness starts to fall off in that area. At that point, you have to re-normalize the material. We mainly deal with making piping parts (desuperheaters) for power plants, which are rolled and welded pieces of 91...
  20. JakeR82

    Specifying SA106B with min ID

    I agree with SnTMan, I would as for a quote of the pipe as you normally do, and then specify on your request for it to have the ID you wish by swage. See who quotes it and who doesn't.

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