Effective Emergency Relief System (ERS) design helps companies meet risk-management goals, compliance requirements, and sound business practices. ioMosaic provides a total ERS solution with our comprehensive ERS design services, from reactivity testing for design basis determination to calculations for Z-axis deflection from dynamic loads.
Our team has decades of experience performing PRFS analysis and design.
Our risk-based approach helps mitigate near-unventable scenarios to a tolerable level of risk.
Better evaluate hazards in your facility with an accurate process simulation.
Delivering properly designed pressure relief systems that save both money and time.
Reasonable estimates of the expected time to failure (ettf) or expected time to yield (etty) are required and necessary for effective risk management as well as effective emergency and fire protection and response. Read this paper for a demonstration of calculating ettf or etty in fire exposure scenarios with Process Safety Office® SuperChems™.
This white paper explains how and who determines the maximum allowable working pressure (MAWP), the relationship between MAWP and Design Pressure, and finally how high-pressure vessel is designed. It specifically looks at how ASME VIII Division 1 formulas that account for the thickness of various vessel parts, such as longitudinal and circumferential force formulas, have evolved. It is discussed within the context of structural material properties that can affect high-pressure design and considers three common types of high-pressure vessels to provide engineers with how MAWP is determined and its potential limitations.
Consider how the circumferential forces in a thin cylindrical shell due to internal pressure affects the thickness of the shell. In the above figure, the internal pressure acts on the projected area formed by the diameter, D, and the length, L, of the cylinder. The force generated as a result of this pressure acts circumferentially and tends to increase radius and tear apart the cylinder along the axis. This is how a cylinder filled with liquid fails when subjected to thermal expansion. We know that pressure is force per unit area. Therefore, this force is thus calculated by [calculation]. The allowable stress, S, of the material of construction of the vessel at the design temperature that opposes the tearing by the pressure acts on the two longitudinal areas, each Lt units, of the vessel. The opposing force [calculation].
This PSE module performs efficient tracking of process safety related data and analysis. A customized workflow allows for a specific operating unit or the entire facility to be studied and evaluated for compliance.
A major petroleum company recently increased production capacity and required an analysis of its existing relief systems to validate performance and design. As a result of increasing production capacity and debottlenecking studies, several refinery units were found to be operating at charge rates higher than the design basis for the relief systems documentation.
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