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Recent content by bvi

  1. bvi

    Finding out what the customer REALLY wants

    Presumably you are the professional, so you should inform the client what the best course of action is, to achieve their objective. If you are knowlegable, and the client appreciates this, this will lead to a long term relationship that is productive to both. If either of the above two is not...
  2. bvi

    Painting before hydrotest

    If you are a project manager focussed on schedule, or a contractor you will want to paint. If you are focussed on the final leak tightness of the system, you will not. There is an article by Jon Batey that shows how you could burst vessels with holes drilled in them, that were subsequently...
  3. bvi

    Normal Fluid Service and Severe Service

    The title of the post is severe cyclic, which requires 100% RT or UT. However, many people misclassify systems as severe cyclic. But if it is in fact severe cyclic, the 100% RT or UT requirements only apply to those portions of the system that are severe cyclic, that is, where the calculated...
  4. bvi

    Welding of tread joints

    There isn't anything wrong with seal welding threaded joints. It used to be done quite frequently with steam systems. But practice has moved towards socket weld joints. See also ASME PCC-2, article 2.3, Repair of Pressure Equipment and Piping, on seal welding threaded joints.
  5. bvi

    Professional Liability Insurance

    The fee for the insurance will go up with the annual billings.
  6. bvi

    Marketing Your Company?

    Work on you network; in my experience it is the most reliable source of work (by referals, repeat work, etc). As stated by others, it is a long process, but it is the most reliable way to build business in the long term. Further, if things don't go well with your current job, your network will...
  7. bvi

    How Much Profit From Employees?

    Average mutliplier for a consulting engineering firm is about 3.0. Perhaps a little higher this past year. But you need to understand what type of firm you are. Do you have people that are 100% assigned to projects, or out the door, or are you providing consulting tasks on demand on a variety...
  8. bvi

    Nozzle loads, primary or secondary.

    The responses are correct, the through thickness bending is a secondary stress regardless of the source of the load on the nozzle, but I wanted to address another part of the question. The nozzle does not know whether the loads being applied are due to pressure, weight, or thermal expansion...
  9. bvi

    Alum Piping

    If you weld it, use the lower annealed allowable stress values.
  10. bvi

    Allowable Stress for Steam Blow Piping

    If you are looking for design rules for A106 Gr B at over 1000F, ASME B31.3 provides allowable stresses up to 1100F, but they will be very conservative for a temporary steam blow operation, as they are based on long term creep properties. The allowable stress is 1 ksi.
  11. bvi

    assembling flanges with studbolts

    Studs are the norm and are of course permited. But why in the world would you use low strength stainless bolting that gauls with a carbon steel flange. It seems to be a recipe for problems.
  12. bvi

    ASME B16.47 Series A or B?

    I don't think the Series B are being properly characterized in the response, above. The Series B uses more, but smaller bolts, so the bolt circle diameter is less, so the flange moment (essentially proportional to the distance between the bolt circle and gasket circle) is less for a given total...
  13. bvi

    Post Construction Code, Status

    There is a new fitness for service standard that will be issued soon, a joint API/ASME standard that will replace API 579. This is supposed to be published this year. There is also a new inspection code under preparation, also a joint API/ASME effort, that will combine API 510 and API 710...
  14. bvi

    B31 Coefficient y for Pipe Thickness Calculation

    It remains 0.4 for other ductile metals in B31.3. This is based on the stress distribution through the thickness of the pipe, and basically calculates the hoop stress at the ID for internal pressure. The factors goes up in the creep range, when it is defined as it is for some metals, because...
  15. bvi

    ASME Flange Bolting Recommendation

    It applies to raised face joints.
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