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AutoPIPE Wiki 01. While calculating maximum allowable nozzle loads (Fmax) as per EN 13445-3 (2021), Why Δ, K & α are zero?
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            • -A. As Per BS EN 13445-3
              • 01. While calculating maximum allowable nozzle loads (Fmax) as per EN 13445-3 (2021), Why Δ, K & α are zero?
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    01. While calculating maximum allowable nozzle loads (Fmax) as per EN 13445-3 (2021), Why Δ, K & α are zero?

    Applies To
    Product(s): AutoPIPE Vessel
    Version(s): ALL
    Area: Report
    Date Logged
    & Current Version
    Aug 2021
    41.01.01.011

    Problem:

    While calculating maximum allowable nozzle loads (Fmax) as per EN 13445-3 (2021), Why Δ, K & α are zero?

    Solution:

    While calculating global longitudinal compressive stress limit, As per EN 13445-3 (2021) Clause 16.14.8,

    Cylinders should not be checked against longitudinal buckling if equation 16.14-15 satisfied. Refer below reference.

    If equation 16.14-15criteria met, then permissible longitudinal compressive stress σc, all may be taken as design stress f of the nozzle.

    Hence in this case no further calculations for Δ, K & α are zero, and  σc, all is same as design stress at design temperature.

    Note: AutoPIPE Vessel using fabrication tolerance quality class C and taking factor PSI (ψ) = 0,75 which is a conservative assumption for vessels that satisfy the manufacturing tolerance requirements of EN 13445-4:2019, Clause 6.

    See Also

    AutoPIPE Vessel

    Bentley LEARN Server

    • AutoPIPE Vessel
    • Nozzle Load
    • EN 13445
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    • Tanaji Gaikwad Created by Bentley Colleague Tanaji Gaikwad
    • When: Tue, Aug 1 2023 12:46 AM
    • Tanaji Gaikwad Last revision by Bentley Colleague Tanaji Gaikwad
    • When: Thu, Aug 3 2023 2:02 AM
    • Revisions: 3
    • Comments: 0
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