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  • Users: sbnz
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  1. sbnz

    longitudinal stress in pipe under internal pressure

    Hi, An elementary question for the experts. For piping under internal pressure, the longitudinal stress in pipe elements is the sum of a) stresses due to bending and b)longitudinal (or meridional) stress due to pressure ( pD/4t) Question is, for a section of piping within 2 expansion joints...
  2. sbnz

    Mollier diagram of steam - SI unit

    Hi, Could somebody suggest a link for printable mollier chart for steam in SI units please? My google results have not been very satisfactory yet - I am getting diarams either in imperial units or poor image quality thanks in advance
  3. sbnz

    Safety shut-dwon of wellheads

    Hi, I have received a concern (from environment specialist) during a Hazop analysis for a steamfield that what is the safety provision in the (unlikely) event of the two-phase or brine cross country pipeline rupturing (say, hit by a heavy truck) Admitting this is improbable to "break" a...
  4. sbnz

    Edit Add-In and userined function (.xla)

    Hi, I have been using a .xla file in the xlstart folder for a long time (originally sourced early during my career) which contains various useful custom built functions for my area of work. I can access the functions built in the .xla file perfectly from within Excel in my computer (under...
  5. sbnz

    50NPS Cast steel valve rating

    Quick question : Do Cl-150 and Cl-300 rating valves exist for small sizes of 25 and 50 NPS (1" and 2") - or is it minimum Cl-800? cheers,
  6. sbnz

    Fabricated slip-on flange

    How do I calculate the thickness (and other requirements) of a fabricated (from plate) slip-on flange, to comply with piping code (B31.1) requirements For specific reason, we can not use a standard Cl-900 flange to B16.5 in this particular case and need a special flange made. thanks
  7. sbnz

    Pressure pipe design - thermal stress range

    Hi, What is the exact definition of "thermal stress range" in pressure piping codes B 31.1 or B 31.3? Does it mean: a) the thermal stress range from "installation" temperature to either maximum or minimum operating temperature, Or b) the thermal stress range from "minimum" to "maximum"...
  8. sbnz

    load combination for piping analysis

    For a pressure piping system in a power plant that we are designing as per B 31.1, the combination of maximum operating plus occassional (cyclonic wind) loads are resulting in excessive nozzle loads for connected equipment. Is it reasonable to assume a less severe combination (eg, wind loads...
  9. sbnz

    drop down combo list

    Hi, Can any of you Excel experts help me (an ordinary Excel user) in identifying what type of control object (or some other type of object) the attached drop down list is made from? This is not a combo box from the control toolbar. By right clicking on "Form Control" I can see an additional tab...
  10. sbnz

    Restriction orifice plate

    We have to design one (multiple?) restriction orifice plates in a DN150 (6"), 7 barg water line to reduce the pressure to 4 barg. I do not have a copy of the BS/ISO standard readily available and am trying to look for other sources to calculate the orifice size. My initial questions are: a) Is...
  11. sbnz

    Allowable stress for 904L pipe materials

    Hi all, I am designing a pressure piping system where the pipe material is SS to ASTM A 240, TP 904L (UNS N08904). I was trying to decide the corresponding pipe spec and the allowable stresses as per B 31.1 - but am completely confused without any joy. I noticed ASTM A 312 standard covers...
  12. sbnz

    Pump outlet at same level as inlet, piping at elevated level

    We have to select a pump for transferring (lean) ash slurry from one pit to another, ~200m apart. The piping configuration requires that the pump lifts the fluid from the underground pit to over 10m height, flows through the pipeline at slight slope and then drops to the other pit. The final...
  13. sbnz

    A 106 Gr B allowable stress

    The allowable stress for A 106 Gr-B pipe is 17,100 psi (-20º to 650ºF) as per ASME B 31.1- Addenda 2005 (which we have a copy). I gather the allowable stress for same material as per ASME VII Div 2 (which we do not have a copy and can't actually check) is 24,300 psi ? Can somebody confirm me...
  14. sbnz

    Axial thrust due to pressure reduction

    Hi, We have a 400NB water supply pipeline where a direct acting pressure reducing valve is to be installed to reduce the pressure of 130m of water to 50m of water. Question is, is there an axial thrust generated inherently due to the pressure reducing valve functioning which needs to be...
  15. sbnz

    ANSI Valve Standards

    What is the difference between B16.10 and B 16.34 when specifying a valve? Does B16.34 cover both the pressure ratings and dimensions?
  16. sbnz

    Load distribution in hold down bolts for circular base plates

    Hi, I have to select the hold down (anchor) bolts for a pressure vessel (designed and supplied by others) having circular base (and large [pockets for the HD bolts). I have the foundation loads, the critical load being a horizontal pipe load applied at a height resulting in a significant...
  17. sbnz

    Pipe Saddle for high temp application

    We are involved in designing a high temperature (500ºC) steam piping inside a power station. The pipe material selected is ASTM A335 P91 and the slippers (shoes/ saddles) of A387 Gr22. Can somebody, having experience of designing piping for such temperature application recommend the correct/...

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