Calculating Blank Head Thickness
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Questions and Answers

Which type of dished head is described as a curved end-section that closes off cylindrical components such as shells and drums?

  • Full hemispherical
  • Segment of a sphere
  • Torispherical (correct)
  • Ellipsoidal

    • What is the formula used in ASME BPVC Section 1, PG-29.1 to calculate the minimum required thickness of a seamless, unstayed dished head?

  • PG-29.11 to PG-29.13 UG-32(e)
  • PG-29.1 (correct)
  • PG-29.6 UG-32(d)
  • PG-29.7 to PG-29.8 UG-32(c)

    • In the design of a semi-ellipsoidal dished head, what is the relationship between the radius L and the diameter D?

  • L = 3D
  • L = 2D
  • L = D/2 (correct)
  • L = D

    • According to the given text, what is the formula for calculating the thickness of a cylindrical vessel?

    <p>t = A^4.8 Sw</p> Signup and view all the answers

    What is the value for the shell thickness calculated using the formula from PG-27.2.2?

    <p>10.63 mm</p> Signup and view all the answers

    Which head shape has a 2:1 ratio between the major and minor axis of the ellipse?

    <p>Ellipsoidal head</p> Signup and view all the answers

    What is the formula for calculating the thickness of a full-hemispherical head with the pressure on the concave side?

    <p>t = PL - 2Sw - 0.2P</p> Signup and view all the answers

    Which formula is used to calculate the thickness of a blank, unstayed dished head with the pressure on the concave side, when it is a segment of a sphere?

    <p>$t = 5PL/4.8Sw$</p> Signup and view all the answers

    What is the radius to which the head is dished if it is not greater than the outside diameter of the flanged portion of the head?

    <p>$L$</p> Signup and view all the answers

    When a head, dished to a segment of a sphere, has a flanged-in manhole or access opening that exceeds 150 mm in any dimension, how much should the thickness be increased by?

    <p>No less than 15% of the required thickness for a blank head</p> Signup and view all the answers

    Which paragraph states that no head, except a full-hemispherical head, shall be of lesser thickness than required for a seamless shell of the same diameter?

    <p>PG-29.6</p> Signup and view all the answers

    According to the given information, what is the required thickness of a seamless, blank, unstayed dished head with a diameter of 1067 mm and a dish radius of 915 mm?

    <p>22.17 mm</p> Signup and view all the answers

    According to the given information, what is the thickness of the shell in Example 8?

    <p>12.30 mm</p> Signup and view all the answers

    According to the given information, what is the required thickness of the head in Example 9 with a flanged-in manhole greater than 150 mm in one dimension?

    <p>25.50 mm</p> Signup and view all the answers

    According to the given information, what is the required thickness of the head in Example 10 with a flanged-in manhole greater than 150 mm in one dimension?

    <p>31.17 mm</p> Signup and view all the answers

    Study Notes

    Dished Heads

    • A curved end-section that closes off cylindrical components such as shells and drums is described as a dished head.

    Calculating Thickness of Dished Heads

    • The formula used in ASME BPVC Section 1, PG-29.1 to calculate the minimum required thickness of a seamless, unstayed dished head is not provided.
    • In a semi-ellipsoidal dished head, the radius L is equal to one-quarter of the diameter D (L = D/4).

    Cylindrical Vessels

    • The formula for calculating the thickness of a cylindrical vessel is not provided.

    Thickness Calculations

    • The formula for calculating the thickness of a full-hemispherical head with the pressure on the concave side is not provided.
    • The formula for calculating the thickness of a blank, unstayed dished head with the pressure on the concave side, when it is a segment of a sphere, is not provided.
    • If the head is dished to a radius not greater than the outside diameter of the flanged portion of the head, the radius is not specified.
    • When a head, dished to a segment of a sphere, has a flanged-in manhole or access opening that exceeds 150 mm in any dimension, the thickness should be increased by 3 mm.

    Thickness Requirements

    • No head, except a full-hemispherical head, shall be of lesser thickness than required for a seamless shell of the same diameter.
    • The required thickness of a seamless, blank, unstayed dished head with a diameter of 1067 mm and a dish radius of 915 mm is not provided.
    • The thickness of the shell in Example 8 is not provided.
    • The required thickness of the head in Example 9 with a flanged-in manhole greater than 150 mm in one dimension is not provided.
    • The required thickness of the head in Example 10 with a flanged-in manhole greater than 150 mm in one dimension is not provided.

    Head Shapes

    • A semi-ellipsoidal dished head has a radius L equal to one-quarter of the diameter D (L = D/4).
    • A head with a 2:1 ratio between the major and minor axis of the ellipse is a semi-ellipsoidal head.

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    Related Documents

    ASME Section 1 Dished Head Calculations PDF

    Description

    This quiz involves calculating the thickness of a blank head using ASME Section I, Chapter 2 code calculations. The given values for pressure, radius of curvature, and stress are substituted into the equation to determine the thickness.

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