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  1. MechEngFiji

    ASME B31.4 Equation 402.6.2 SI Units

    ASME have issued an interpretation #17-1764 on the above query regarding area units for the SI version of Equation 402.6.2 in B31.4.... units should me mm2.
  2. MechEngFiji

    ASME B31.4 Hoop Stress

    I have had look at the equations used by AutoPipe to calculate hoop stress and have discovered that for ASME B31.4 it uses the nominal (actual) wall thickness as a default. Therefore, I would assume that the use of corroded wall thickness can be deemed as conservative, exceeding the requirement...
  3. MechEngFiji

    ASME B31.4 Hoop Stress

    Thanks LittleInch for your usual prompt reply. My issue is that I need to work out the hoop stress to find out if impact testing (423.2.3) requirements apply. The pipe wall thickness is 7.11mm and the calculated design wall thickness (based on 403.2.1) computes to 2.8mm (which includes a 12.5%...
  4. MechEngFiji

    ASME B31.4 Hoop Stress

    Hi All, What wall thickness should be used to calculate the operating hoop stress as per ASME B31.4 Clause 402.3? Should it be the corroded thickness? Is there an ASME B31.4 interpretation for this? Thanks.
  5. MechEngFiji

    Autopipe Model Pressure

    Hi All, Need some clarificaion around what pressures to use for modeling in Autopipe. Our pump operating pressure is about 340m (dead head 400m). The thermal relief valves setting is set at 400m (hydrocarbon duty). What pressure should be used in the model in conjunction with the seismic...
  6. MechEngFiji

    ASME B31.4 Equation 402.6.2 SI Units

    Hi All, Need some clarificaion around what pressures to use for modeling in Autopipe. Our pump operating pressure is about 340m (dead head 400m). The thermal relief valves setting is set at 400m (hydrocarbon duty). What pressure should be used in the model in conjunction with the seismic...
  7. MechEngFiji

    ASME B31.4 Equation 402.6.2 SI Units

    Thanks LI. Have sent a clarification request to ASME.
  8. MechEngFiji

    ASME B31.4 Equation 402.6.2 SI Units

    Hi All, The axial stress in the above equation (=Fa/A) calls up the axial force (Fa) in Newtons while the pipe cross sectional area (A) is called up as cm2. The resulting longitudinal stress is supposed to be in MPa which it isn't. Am I missing something here? Thanks in anticipation.

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