Daily Concept Booster Mechanical Engineering: Pressure Vessels

Pressure Vessels

Pressure vessels are mainly of two type first one is thin shells and another is thick shells.

Thin shells

If the ratio of thickness of the wall to the its diameter of the shell is less than 1/10 to 1/15, then shell is called thin shells.
i.e., t/D_i < 1/10 to 1/15

Important Points

In case of thin shells, it is assumed that the normal stresses, which may be either tensile or compressive are uniformly distributed through the thickness of wall.

Nature of stress in thin cylindrical shell subjected to internal pressure

(i) Hoop stress or circumferential stress will be tensile.
(ii) Longitudinal stress or axial stress will be tensile.
(iii) Radial stress will be compressive.

Thick Shells

If the ratio of thickness of the wall of the shell to its diameter is greater than 1/10 to 1/15, then such type of shell is called thick shells.
i.e., t/D_i > 1/10 to 1/15

Important Points

Radial compressive stress varies from a value at the inner surface equal to pressure ‘P’ to the atmospheric pressure at the outside surface.
If internal pressure in thin cylinders is low, the radial stress is negligible compared with axial stress and hoop stress. This radial stress is neglected.

Boost your preparation with the all-new Concept Booster Series by Adda247 Engineering Jobs, this series aims to target all the important engineering exams such as SSC JE 2022, GATE 2022, ESE 2022, and many more. Please reach out to us with your feedback in the comment section.

Sharing is caring!

Published by VINAYAK KUMAR

Graduated from BIT Sindri, Postgraduated from IIT BHU Varanasi

Leave a comment

Your email address will not be published. Required fields are marked *