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).
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 ).