This document provides guidance on setting up a flarenet model including: 1) Gathering necessary input data from PRV datasheets, piping drawings, and relief load compositions from simulators. 2) Preparing utility drawings and design basis information on piping class and relief system constraints. 3) Building the model in Flarenet by inputting basic info, main components, piping, PRVs and creating scenarios. 4) Running model calculations for header sizing, scenarios, depressurization, fire zones, and tailpipe sizing. 5) Checking results for variables, messages, and visual inspection for issues like choking.

1. Flarenet Model Setup Fan, Yi

2. Preparation before model setup PRV Datasheets (only those relieve to flare) Type, number and size Set pressure and relief Condition (T, P) Relief Load (required flow, and rated flow) Plot Plan (if isometric drawing not available) To identify PRV location To measure the preliminary line length To determine the fire zone Relief load composition for global, fire and controlling case for each control valve Basis for a correct and accurate Flarenet model Obtained from simulator (HYSYS, Pro II or ASPEN Plus) Suggestion: Create a composition list in relief valve calculation sheet, at least global case, fire case and controlling case.

3. Preparation before model setup Utility P&ID of Flare System Help to find P&ID for each relief valve Get line number for header and laterals. Flare System Piping Class From System group and ensure correct piping schedule used for model calculation Relief System Design Basis Get constraints for specific project. Mach Number, Velocity, Noise

4. Flarenet Model Setup - Start a new model Basic info Main component Select Unit Edit preference Input piping class

5. Flarenet Model Setup - Build the model in PFD

6. Flarenet Model Setup - Build the model in PFD Data input for model component Flare tip and KO drum Piping Tee and Connector PRV

7. Flarenet Model Setup - Build the model in PFD Create Scenarios Global relief scenario Fire Zone scenario Depressurization scenario Individual PRV controlling scenario

8. Running Flare Model Calculation Option Header sizing Global Scenarios (Power failure, Cooling water failure, Instrument air failure, and Steam failure, etc. Depressurization Some big individual relief (non-global) Fire Zone Tailpipe sizing Use rated flow Normally 1 or 2 nominal size above PRV outlet flange size Main concern is MABP

9. Result Check Variable check Result Message check Visual check

10. Some Tips Thermodynamic deviation Choking problem during tail pipe sizing How to speed up tail pipe sizing Import data from HYSYS Aspen Support: http://support.aspentech.com/

11. Question? Thanks!