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    Ug-27 Thickness of Shells Under Internal Pressure

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    J Angel Hdz
    Minimum required thickness of shells under internal pressure shall not be less than that computed by the following formulas.

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    Ug-27 Thickness of Shells Under Internal Pressure

    Uploaded by

    J Angel Hdz
    27 views2 pages
    Minimum required thickness of shells under internal pressure shall not be less than that computed by the following formulas.

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    UG

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    Minimum required thickness of shells under internal pressure shall not be less than that computed by the following formulas.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    27 views2 pages

    Ug-27 Thickness of Shells Under Internal Pressure

    Uploaded by

    J Angel Hdz
    Minimum required thickness of shells under internal pressure shall not be less than that computed by the following formulas.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    of 2

    UG-27 THICKNESS OF SHELLS UNDER INTERNAL PRESSURE

    (a) The minimum required thickness of shells under internal pressure shall
    not be less than that computed by the following formulas
    (b) The symbols defined below are used in the formulas of this paragraph.
    E= joint efficiency for, or the efficiency of, appropriate joint in cylindrical or
    spherical shells, or the efficiency of ligaments between openings, whichever is
    less.
    For welded vessels, use the efficiency specified in UW-12.
    For ligaments between openings, use the efficiency calculated by the rules
    given in UG-53.
    P= internal design pressure (see UG-21)
    R = inside radius of the shell course under consideration
    S= maximum allowable stress value (see UG-23 and the stress limitations
    specified in UG-24)
    t= minimum required thickness of shell
    (c) Cylindrical Shells. The minimum thickness or maximum allowable working
    pressure of cylindrical shells shall be the greater thickness or lesser pressure as
    given by (1) or (2) below.
    (d) Spherical Shells. When the thickness of the shell of a wholly spherical
    vessel does not exceed 0.356R, or P does not exceed 0.665SE, the following
    formulas shall apply:
    t=

    PR
    2 SE0.2 P

    (1) Circumferential Stress (Longitudinal Joints).


    When the thickness does not exceed one-half of the inside radius, or P does not
    exceed 0.385SE, the following formulas shall apply:
    PR
    t=
    +C
    SE0 .6 P

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