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AutoPIPE Wiki 02. How to check for bolt load calculations for longitudinal saddle load generated during bundle pullout?
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              • 01. Why there are significantly higher values in wind loading in some particular sections of vessels despite the model no platforms / ladders or other equipment?
              • 02. How to check for bolt load calculations for longitudinal saddle load generated during bundle pullout?
              • 03. The program do not finish the calculation
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    02. How to check for bolt load calculations for longitudinal saddle load generated during bundle pullout?

    Applies To
    Product(s): AutoPIPE Vessel
    Version(s): ALL
    Area: Calculations
    Date Logged
    & Current Version
    Oct 2018
    40.07.00.007

    Problem:

    How to check for bolt load calculations for longitudinal saddle load generated during bundle pullout?

    Solution:

    This can be done by specifying an external load equal to the bundle pullout load.
    See example below:

    Case 1: Without considering bundle pullout load 

    The friction factor = 0.3 is mentioned for a right anchored saddle.

    In the calculation report, the longitudinal saddle load for right saddle is computed as follows:

    Horizontal Longitudinal Load = friction factor x (total vertical load on saddle 2)

    = - 0.3 x (reaction due to weight of equipment for the loading case on saddle 2 + weight of saddle 2)
    = - 0.3 x (817.3 + 159.8) = - 293.1 daN, negative sign as the reaction is acting to the left

    So the bolt shear load is calculated as below:

    Max. shear = RaHL/Sb/nb = 293.1/324.3/4 = 0.226 daN/mm2 = 2.26 N/mm2 = 2.26 MPa.

    Case 2: Considering bundle pullout load

    In the same model above, now an equivalent bundle pullout load = 1000 daN is applied axially towards
    right at the left tangent line:

    This extra load is now seen in the design report:

    Horizontal Longitudinal Reaction = -(293.1+1000) = -1293.1 daN 

    In the bolt calculation this is taken into account:

    Max. shear = RaHL/Sb/nb = 1293.1/324.3/4 = 0.997 daN/mm2 = 9.97 N/mm2 = 9.97 MPa.

    See Also

    AutoPIPE Vessel

    Bentley LEARN Server

    • AutoPIPE Vessel
    • bolt stress
    • Calculation
    • Saddle Support
    • Share
    • History
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    • Cancel
    • JamieP Created by Bentley Colleague JamieP
    • When: Thu, Aug 20 2020 12:34 PM
    • Tanaji Gaikwad Last revision by Bentley Colleague Tanaji Gaikwad
    • When: Tue, Aug 1 2023 7:13 AM
    • Revisions: 3
    • Comments: 0
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