ABSTRACT
The analysis for composite tanks, pressure vessels and piping subjected to internal pressure (for tanks, hydrostatic head gives rise to hoop stress only), has been done using many different methods. The British Standard assumes thin wall theory and calculates the average stresses and strains in the wall. These in turn are compared to laminate strength values for failure determination. This Standard covers mainly laminates made of mat and woven roving layers. A rigorous analysis for composite pressure vessels was given by Sherrer [4.1] in which equilibrium equations are written for each individual layer and equilibrium and compatibility equations are written for the layer interfaces. This analysis is applicable to locations away from the ends because average boundary conditions are imposed. Sherrer analysis is applicable not only to thin wall pressure vessel but also for thick wall pressure vessel. Sherrer analysis is rigorous but may not be necessary for the analysis of thin wall vessels, tanks and piping used in the chemical process equipment.
