EPCON PRV Analyzer™

PRV Analysis Software

EPCON PRV Analyzer™ program determines the relieving flow rate and the required size of a pressure relief valve orifice for a protected system. The program also sizes inlet/outlet lines based on maximum relieving flow and the selected PRV.

The user enters equipment data, fluid data and PRV data to size the PRV and its inlet and outlet piping. The fluid conditions that describe each relieving case are entered into the PRV database. The program calculates an orifice size based on the worst case scenario and then selects standard API valve(s) based on set pressure, design or maximum flow temperature and the largest calculated area. The program calculates inlet/outlet line pressure drop based on pipe length, size, and fittings.

Once the PRV calculation is completed (“Issued”), the PRV calculation is documented for future reference and relevant data from the calculation is used to automatically create a data sheet in Microsoft Excel (required for this feature). The user can input fields which are not automatically generated in the data sheet. Once the data sheet is issued, the program allows the engineer to send the data sheet, or groups of data sheets, to a specified directory location.

Each relieving case may be considered to determine the largest orifice size necessary for pressure protection. Detailed calculations to determine the relieving flow rate & phase condition are provided for Fire, Inadvertent Valve Operation and Ruptured Tube cases. All other cases can be run by specifying flow rate and phase condition or from the phase condition determined by the integrated, rigorous 3-phase flash engine (user entry of flowrate required).

PRV Analysis Software

Program Features

EPCON PRV Analyzer™ allows the user to enter conditions specific to each relieving case. The cases for consideration are:
  • Fire- robust calculation of gas expansion and liquid vaporization to determine flow rate or manual entry of known flow with or without flashing.
  • Inadvertent Valve Operation—robust calculation of flow rate and manual entry of flowrate with or without computation of phase condition.
  • Ruptured Tube- robust calculation of flow rate and manual entry of flowrate with or without computation of phase condition.
  • Electrical Power Failure-- manual entry of flowrate with or without computation of phase condition.
  • Cooling Water Failure-- manual entry of flowrate with or without computation of phase condition.
  • Instrument Air Failure-- manual entry of flowrate with or without computation of phase condition.
  • Steam Failure-- manual entry of flowrate with or without computation of phase condition.
  • Single Component Failure-- manual entry of flowrate with or without computation of phase condition.
  • Other-- manual entry of flowrate with or without computation of phase condition only for any other type of failure not specifically addressed above.

The user specifies which of these cases are applicable. The program calculates the flow conditions and required orifice area for detailed “Calculate” cases and the required orifice area for “Manual Flash” and Manual No-Flash” entry cases. Then the program selects standard API valves from the largest calculated orifice area, adjusts design flow to rated flow by scaling from the minimum required orifice size to the selected orifice size, and sizes inlet/outlet lines accordingly within parameters specified by the user ( e.g. single or multiple valve systems ).

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EPCON Software™ is a process engineering software and technology provider. The company, product and service names used in this web site are for identification purposes only and do not represent any type of recommendation to purchase a product or service. API®, GPA®, DDBST®, DIPPr®, AIChE®, Vaaler Award®, Chemical Processing®, Signet Research®, Plant Engineering® Product of the Year and IETC® are registered trademarks in the United States and in other countries and are used with permission. EPCON Software™ and the software products EPCON SiNET™, EPCON ToolBoXpress™, EPCON Multi-Phase Flash™, EPCON Cost Plus™, EPCON CHEMPRO™, Engineer's Aide™, EPCON DIPPRO™, SYSTEM 7 Process Explorer™, Process Innovator™, EPCON PRV Analyzer™ and EPCON Unit Conversions™ are trademarks of EPCON International, Inc. in the United States and other countries. All other trademarks or registered trademarks are the property of their respective owners. Both EI EPCON International Inc. and EPCON Software™ and all its products, services and other trademarks are not affiliated with EPCON Industrial Systems LP or any other company using the word “EPCON” in their trademark in any way. All rights reserved.