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AutoPIPE Wiki 07. Support span suggestions to avoid piping vibration due to Harmonic load case in AutoPIPE ?
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    07. Support span suggestions to avoid piping vibration due to Harmonic load case in AutoPIPE ?

    Applies To
    Product(s): AutoPIPE
    Version(s): ALL;
    Environment: N/A
    Area:
    Original Author: Bentley Technical Support Group
    Date Logged
    & Current Version
    Feb. 2017
    11.00.00.22

    Problem:

    Support span suggestions to avoid piping vibration due to Harmonic load case in AutoPIPE ?

    Solution:

    The following are span suggestion to avoid resonance from compressor acoustic vibration. Typically for low speed motors e.g. 300rpm use multiplier 2.4 up to 4.0, i.e. 5hz x 2.4 = 12hz. High speed compressors e.g. 1800rpm use multiplier 1.4, i.e. 30hz x 1.4 = 42hz.

    Then calculate pipe span based on this fundamental frequency (1st mode) for both fixed and simply supported ends. A typical pipe behaves somewhere between these two boundary conditions. Ref Roark Table 36 case 1b, 2b

    fn = Kn/2/pi *SQRT (Eig/w/L^4)

    hence Span (L) = E.I.Kn2/W/f12

    where :

    W = weight /unit length (kg/mm)

    I = moment of inertia (mm4)

    f1 = frequency (Hz)

    E = Youngs Modulus (Mpa)

    kn = 3.55 (Fixed Ends), 1.57 (simply supported)

    See Also

    Dynamic "Harmonic" Analysis

    Bentley AutoPIPE

    • harmonic
    • guidelines
    • AutoPIPE
    • Harmonic Load
    • Vibration
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    • Mike Dattilio Created by Bentley Colleague Mike Dattilio
    • When: Tue, Feb 21 2017 8:24 PM
    • Revisions: 1
    • Comments: 0
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