Glossary · Batch and process operations
Recipe phase
German: Rezeptphase
In ISA-88 batch control, a recipe phase is the lowest level of a recipe procedure. It specifies a process-oriented action and its parameters, and is linked at run time to an equipment phase that carries it out.
- Batch control
- Process industry
- Standards
In one sentence
In ISA-88, a recipe phase is the lowest recipe level; it specifies one process action and its parameters and links to an equipment phase.
Example
The recipe phase "charge water" specifies 1,200 kg at 25 °C; the batch system passes these values to the dosing equipment phase of the reactor.
How it applies
- Recipe management: Recipe phases carry the process parameters and report values that make up much of the batch data.
- Engineering: The interface between recipe phase and equipment phase (parameter names, units, ranges, reports) must be defined precisely; mismatches are a common commissioning issue.
- Validation: Parameter ranges and their enforcement are typically tested, because a wrong value in a recipe phase directly affects product quality.
- Documentation: A parameter table per equipment phase, with names, units, ranges and defaults, serves recipe authors, operators and validation. Engineering units should be stated explicitly.
Recipe phase vs. equipment phase
The recipe phase says what the recipe needs. The equipment Phase (ISA-88) is the control logic that does it. One equipment phase can serve many recipes with different parameters.