Jun,29

API STD 6X-2019 pdf download.Design Calculations for Pressure-containing Equipment.
3.1.6 limit analysis Special case of plastic analysis that uses elastic–perfectly plastic material properties and small-displacement analysis to calculate the collapse load using a lower-bound approach. 3.1.7 operating conditions Any combination of internal and external pressures, temperatures, and applied loading to which the product is to be exposed in service, excluding hydrostatic shell testing. 3.1.8 plastic analysis Method of structural analysis by which the structural behavior under given loads is computed by considering the actual material true stress–true strain curve or an elastic–perfectly plastic material and may assume small or large deformation theory as required. 3.1.9 pressure-containing Component whose failure to function as intended results in a release of retained fluid to the atmosphere. 3.1.10 ratcheting Progressive plastic deformation caused by cyclical thermal and/or mechanical stresses. 3.1.11 small-displacement analysis Finite-element analysis wherein the stiffness of the elements is calculated based on their initial undeformed geometry. 3.1.12 stress intensity Equivalent intensity of combined stresses at a point based on the maximum shear theory of failure. The stress intensity is twice the maximum shear stress or the algebraic difference between the maximum and minimum principal stresses at a point. 3.1.13 von Mises equivalent stress Effective stress in a unit volume at which yielding is predicted according to the maximum distortion–energy theory. 3.1.14 yield strength Stress level at which material plastically deforms and does not return to its original dimensions when the load is released based on the 0.2 % offset method in accordance with ASTM A370 or ISO 6892-1 .
4.6 Serviceability Criteria Serviceability criteria that ensure the performance and functionality of the product, as defined by the manufacturer, shall be satisfied at critical locations when subjected to the operating and hydrostatic test conditions. NOTE Examples of serviceability criteria are limits on deflections or rotations that may cause leakage or operational concerns. 5 Elastic Analysis 5.1 Stress Limits 5.1.1 General For elastic analysis, stress components shall be calculated, combined, and then compared to limits for each category of stress based on multiples of the design stress intensity, S m , for the material in use and for the category of stress. For API 6A equipment, standard and non-standard materials shall be as defined in API 6A and the corresponding design stress intensity per 5.1 .2 or 5.1 .3 shall be used. For other equipment, the design stress intensity per 5.1 .2 shall be used, unless otherwise required by the product specification or manufacturer’s specification.

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