Refinery pressure relief valve evaluation for determining relief valve capacities at current process throughput rates.
REFINERY RELIEF SYSTEM CAPACITY EVALUATION
Process Engineering Associates, LLC (PROCESS) was contracted by the client to conduct a comprehensive evaluation of selected refinery pressure relief valves for the purpose of determining relief valve capacities relative to current process throughput rates. Project elements included:
- Refinery process information review
- Heat and mass balance and vapor-liquid equilibrium calculations preparation
- Relief valve relief requirements and capacities evaluation.
PROCESS reviewed the client’s engineering documentation to identify existing relief valve locations, applications, and sizes. Existing heat and mass balance information was also reviewed and additional heat and mass balance and vapor-liquid equilibrium calculations were performed by PROCESS using commercial computer process simulation software to complete the refinery throughput information required for the relief valve evaluation. The computer process simulation software was also used to determine relief stream detailed chemical/physical properties as required for input to PROCESS' proprietary in-house relief valve capacity computer program. This program was used to evaluate the vapor and liquid relief capacities of each relief valve as well as relief requirements for identified potential pressure relief scenarios, including:
- Blocked liquid and/or vapor flow
- External fire
- Loss of cooling
- Loss of power
- Gas blowby
- Malfunctioning control valve
- Heat exchanger tube failure
- Reverse/misdirected flow
- All other pressure relief scenarios identified during the course of the evaluation
The same computer technology was used to calculate the required size for relief valves determined to be undersized for the current applications.
Process relief valve evaluations were performed for 82 valves not evaluated during a previous PROCESS project for the following refinery process units:
- Saturate gas plant
- Naphtha hydrotreater
- Sulfur recovery
- Cat feed hydrotreater
- HF alkylation
- Petroleum Refining
- Heat and mass balance
- Computer process simulation
- Pressure relief valve (PRV) and pressure safety valve (PSV) sizing
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