CHEMCAD SAFETY NET

Plant safety and Piping Networks Software

GENERAL FEATURES

• Graphical user interface with Coach facility for guided input
• Extensive on-line help available
• Extensive drawing facilities
• Fully integrated with CHEMCAD and all other CHEMCAD modules.
• OLE, COM, and Visual Basic compatible.
• Interfaces to Lotus 1-2-3, Excel, and AutoCAD (DXF), Word, Wordpad, etc
• Program support available at 1-800- CHEMCAD or over the internet.

THERMODYNAMICS AND PHASE EQUILIBRIUM

The CHEMCAD thermodynamics system has been spplied to a very wide range of processes and thermodynamic applications ranging from gas plants and refineries to fine chemicals. The methods and techniques available in the program are summarized below.

• Hydrocarbons: Peng-Robinson, Soave-Redlich-Kwong, API Soave, Grayson-Streed, Maxwell-Bonnell, BWRS, K-Charts, Regular Solution
• Chemicals: NRTL, UNIQUAC, Wilson, UNIFAC, Margules, Van Laar, Chien-Null, 4-parameter equation of state, ESD, SAFT
• Ploymers: UNIFAC for polymers, Flory-Huggins, ESD
• Electrolytes: Pitzer, MNRTL(1982), MNRTL(1986), and ideal.
• Special Systems: amines, sour water, methanol, ethane-ethylene, propane-propylene, partial pressure (Ionic)
• Others: Henry™s Gas Law, vapor pressure, user K tables

OTHER THERMODYNAMIC FEATURES:

• Pure component physical properties databank of 1900 compounds (from DIPPR)
• Handles multiple liquid phases
• Group contribution methods available for physicall properties and mixture properties estimation
• Data fitting facilities provided
• Predicts VOC emissions

UNIT OPERATIONS

• Node - point in the piping network where pressure change occurs for some specified reason. Other UnitOps go to and from nodes.
• Pipe - models the pressure drop through a pipe segment or set of segments. A wide variety of pressure drop methods are available for both single and two-phase flow.
• Pump - to move incompressible flow. Performance curve can be entered.
• Flash - for phase separation under specified conditions.
• Valve - simple valve for specifying outlet pressures, pressure drops, etc.
• Control valve - comprehensive valve module for calculating pressure drops and/or flow through the valve based upon valve size and characteristics, flow conditions, and material properties.

FLUID FLOW METHODS

• Darcy-Weisbach Equation - for single phase flow either compressible or incompressible.
• Baker Method - for two phase flow. Determines if the flow is dispersed, bubble, slug, stratified, plug, annular or wave flow and applies appropriate equation.
• Beggs and Brill Method - for two phase flow. Identifies the flow as segregated, intermittent, distributed, or transition flow to select correct equation parameters.
• Isothermal flow equation - for long distance transmition lines.
• Hazen Williams equation - for water sprinkler fire protection systems
• Fritzsche equation - pressure drop formula for steam systems.
• Critical flow - critical flow of compressible fluids is always detected and reported. At the users option, it will limit flow.

DIERS (DATA INSTITUTE FOR EMERGENCY RELIEF SYSTEMS)

• Design and rating of relief valves and/or rupture disks.
• Bubbly, churn - turbulent, and homogeneous vessel models.
• HEM, ERM, Henry-Fausk HNE, non-flashing liquid and single phase vapor vent flow models.
• API-520/52, API-2000, OSHA 1910.116, and NFPA-30 fire models, or specified heat rate.
• Inlet and outlet piping pressure drop calculations.
• Comprehensive vessel and relief vent specification capabilities.
• Atmospheric and pressure vessels.