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Follow the links below to find material targeted to the unit's elements, performance criteria, required skills and knowledge

Elements and Performance Criteria

1. Prepare for mass balance
   • Identify purpose of mass balance
   • Determine possible boundary for analysis
   • Identify plant and mass sources and sinks within boundary
2. Calculate mass flow rates of streams
   • Calculate mass flow rate of plant streams from volumetric data, correcting for changes in density
   • Calculate mass flow rate of individual components of plant streams from their concentrations
   • Calculate mass accumulation (+ or -) within a plant item
3. Calculate mass change due to a chemical reaction
   • Determine yield from reaction of all significant products
   • Determine mass output of all significant products arising from the reaction for specified reactant inputs
4. Conduct mass balance over process components
   • Determine desired boundaries for mass balance calculation
   • Determine possible sources of data required from the plant
   • Match and adjust sources of data to desired boundary for mass balance
   • Determine overall mass balance
   • Determine mass balance for each significant component/ reactant and product
   • Interpret results to meet purpose of the mass balance

Range Statement

This field allows for different work environments and conditions that may affect performance. Essential operating conditions that may be present (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) are included.
Regulatory framework	The latest version of all legislation, regulations, industry codes of practice and Australian/international standards, or the version specified by the local regulatory authority, must be used, and include one or more of the following: legislative requirements, including work health and safety (WHS) industry codes of practice and guidelines environmental regulations and guidelines Australian and other standards licence and certification requirements All operations to which this unit applies are subject to stringent health, safety and environment (HSE) requirements, which may be imposed through state/territory or federal legislation, and these must not be compromised at any time. Where there is an apparent conflict between performance criteria and HSE requirements, the HSE requirements take precedence.
Procedures	All operations must be performed in accordance with relevant procedures. Procedures are written, verbal, visual, computer-based or in some other form, include one or more of the following: emergency procedures work instructions standard operating procedures (SOPs) safe work method statements (SWMS( formulas/recipes batch sheets temporary instructions any similar instructions provided for the smooth running of the plant

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Performance Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy the requirements of the elements and performance criteria, and include the ability to:

determine the boundaries of the system to be studied

collect the required plant data from measurements, readings or calculated quantities

calculate the mass transfer loads

conduct mass balances

report the results as required by the purpose of the mass balance.

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Knowledge Evidence

Evidence must be provided that demonstrates knowledge of:

stoichiometry of chemical reactions

changes in density with temperature (and pressure where appropriate)

mass balances

plant equipment, its characteristics and limitations

process-specific science.

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