Design of Quick Closure Device for Pressure Vessels. (Part 3). (Introduction of JIS B 8284).:Introduction of JIS B 8284

概要

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Part 3 of this series of articles has been prepared to introduce the strength calculation formulas of an integral type (clamp type with ratches). In this type of closures, the clamp portion that supports a cover plate is situated at the end of a vessel shell as an integral part of a shell itself.In the case of the integral type (clamp type with ratches), the internal pressure working on a cover plate is supported by plural ratches of a clamp ring via ratches which are formed in the periphery of a cover plate and same in number as those of clamp ring ratches. This type of clamp is similar as the clamp connection type (integral type) introduced in Part 1 and comparatively simple in construction and operation. It should be noted, however, the clamp connection type (integral type) is generally for use of lower pressures (below 10kg/cm2), whereas, the integral type (clamp type with ratches) is serviceable under higher operating pressures.Strength calculation of the integral type (clamp type with ratches) can be carried out using the calculation formulas given in JIS B 8284 or its Appendix. In addition, this Appendix provides a method for statistically indeterminative stress analysis of discontinuous cross sections with higher accuracy.
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