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™.
The loss of High Pressure (HP) / Low Pressure (LP) interface has to be evaluated in order to (a) ensure that the downstream equipment can handle the energy and/or mass accumulation and (b) to also ensure that the upstream equipment can handle the rapid depressurization. The loss of the HP/LP interface can occur as a result of automatic controls failure/malfunction, and/or inadvertent valve opening / human error as seen in Figure 1. Potential outcomes of the loss of the HP/LP interface include but may not necessarily be limited to:
1. Overfilling of the downstream equipment, i.e. as the liquid is displaced from the upstream equipment into the downstream equipment.
2. High temperatures associated with the rapid compression of the vapor space of the downstream equipment associated with liquid displacement.
3. Multiphase flow associated with increasing liquid level, liquid entrainment, and/or high superficial vapor velocities caused by pressure relief device actuation in the downstream equipment.
4. Low temperatures caused by rapid depressurization in the upstream equipment and ultimately in the downstream equipment as pressure is further reduced when the gas breaks through to the downstream equipment.
5. Possible hydrate formation in the upstream and / or downstream equipment.
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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