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  1. vehazle

    ASME VIII-1, Appendix Y, Class 2 Flange - Clarification Assistance

    Hello All, I am looking for some assistance in clarifying the calculation of a Class 2 flange per App Y, specifically how to decipher/interpret Y-6.3 (a) (1-4). This whole Y-6.2 section on Class 2 seems overly contorted and hard to follow (at least for me) and I have puzzled over this for a...
  2. vehazle

    Help with shutoff valve/actuator selection for water service

    Hello all, I am new to the valve/actuator game and am trying to learn quickly on the job regarding the ins and outs of the various options. I have tried talking to various vendors learn more, but I get the run around (distributors say to talk to the manufacturers who say to talk to the...
  3. vehazle

    No vertical seismic force applied to lug

    I am using the "User" Seismic inputs to apply horizontal & vertical accelerations to a vertical pressure vessel supported with 4 lugs. I have input both vertical and horizontal accelerations, but in looking at the lug calculation report, it does not appear that the additional force from the...
  4. vehazle

    Design Responsibilities - ASME/NB & Industry Practice

    With respect to VIII, Div. 1, who has design responsibility for a vessel? Is it generally the U stamp holder whether they design the vessel themselves or contract the service? Is there a clear position from the National Board? The way I view it is that I am hiring the U stamp holder to supply...
  5. vehazle

    bar

    So how does kg/cm2g (or kg/cm2abs) relate? Sorry, I couldn't resist. I mostly work in either bar or psi but just about the time I forget the conversions for kg/cm2, a project from Asia (mostly Japan) comes along and throws me back a bit.
  6. vehazle

    Intermediate/High Strength Low Temp Bolting Materials

    For the immediate problem I need 1.375", but we have ASME VIII-1 vessel applications that can go up to 2.25-2.5". Unfortunately I have not worked with B31.3 and the copy I have available is dated (1984) and does not have these materials in table A-2. Do you perchance know how VIII-1 looks upon...
  7. vehazle

    Intermediate/High Strength Low Temp Bolting Materials

    The application is for non-corrosive service, hydrocarbons (mostly LNG), under high pressures. It is mainly piping, but also ASME VIII-1 vessels and pressure casings. The operating temperature for LNG service is -270F but the non-pressurized/service temperature can sometimes go to about 150F...
  8. vehazle

    Intermediate/High Strength Low Temp Bolting Materials

    -SA-320, B8, Cl1 bolt material is classified as low strength in ASME B16.5. -ASME B16.5 limits low strength bolting to 300# ratings or less. -SA-320, B8, Cl2 bolting is classified as intermediate strength per ASME B16.5 and can be used in any flange rating (with qualifications on verifying the...
  9. vehazle

    Leads of a three phase induction wye-wye motor

    Sorry for letting this drop for so long due to internet availability and presssure to figure out the problem. We finally figured out the reasons for the strange induced voltage readings and were able to identify the correct lead phasing/marking. As it turns out the test using a single phase AC...
  10. vehazle

    Leads of a three phase induction wye-wye motor

    Thanks for the input waross. In answer to your questions: -it is an induction machine: 3ph/1000kw/3300V/50hz. As for the connections the 2 wyes of the generator are connected to busbars where they are paired (generator side:line side), a1-a2:A, b1-b2:B, c1-c2:C. It is connected by a VFD to...
  11. vehazle

    Leads of a three phase induction wye-wye motor

    Unfortunately it is not possible to apply any significant voltage/amperage to the generator. This is due to the fact that it is designed to run inside a can, submerged at very low temperatures. To get access to the 6 leads the machine must be drained and warmed-up. In this state any...

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