- PMAOPS305B - Operate process control systems
Operate process control systems
In a typical scenario an operations technician uses a centralised process control system to operate and monitor the plant. This control system would typically be a distributed control system (DCS) and may include other local controllers which are integral to its operation (stand alone local controllers are covered by PMAOPS216B Operate local control system). This panel technician/central control room operator has an overall responsibility for the operation of all units of equipment covered by the control system. As such they often also take a lead role as part of the operating team. Competencies required by this role other than panel competencies as such are not covered by this unit.
The operations technician would:
identify, correct and report operational problems
be aware of and contribute to a safe working environment
contribute to the safe and productive operation of the system
operate, monitor and maintain equipment using relevant procedures
take appropriate action following an alarm or out of specification condition developing
Generally the operations technician would be part of a team during start up, shut down and normal operating conditions and would be expected to be capable of demonstrating competence in all parts of this unit. He/she would be taking a leading role in liaising and cooperating with other members of the team. Typically the panel operator will liaise with other 'outside operators', however this unit does not preclude the situation where the panel operator may also undertake 'outside' functions.
Elements and Performance Criteria
1. Prepare for work.
1.1. Identify work requirements
1.2. Identify and control hazards
1.3. Coordinate with appropriate personnel
2. Use operator interface.
2.1. Use keyboards, track ball and monitor and/or stand alone controllers to access control system/panel
2.2. Monitor the process using the operator interfaces
2.3. Select appropriate controller modes
2.4. Access historical data and information
2.5. Acknowledge messages and alarms.
3. Access control information.
3.1. Obtain relevant data and information from the control system by applying systems knowledge
3.2. Identify the status of individual pieces of equipment from the control panel and use information to identify potential faults
3.3. Minimise fluctuations and variations in process through the interpretation of existing trends and control schematics
3.4. Record process variations/irregularities to procedures.
4. Control process variations and monitor operations.
4.1. Use historical data to assist the identification of problems
4.2. Process available information to identify potential faults
4.3. Undertake required set point/output changes to meet plant and process requirements
4.4. Optimise plant operating conditions in accordance with guidelines
4.5. Adjust production in response to test results and control panel information
4.6. Monitor key process and environmental variables and take appropriate action
4.7. Adjust controller settings in accordance with procedures
4.8. Use fine tuning software as appropriate
4.9. Coordinate with up stream and downstream units as appropriate
4.10. Record adjustments and variations to specifications/schedules
4.11. Communicate to appropriate personnel as required.
5. Facilitate planned and unplanned process start-ups and shut-downs.
5.1. Select and apply procedures to planned startup and shutdown processes
5.2. Select and apply procedures to unplanned shutdown processes
5.3. Implement all required emergency responses
5.4. Communicate necessary information to all personnel affected by events
5.5. Log all required information.
6. Respond to alarms or out of specification conditions.
6.1. Identify system(s) affected by the alarm or condition
6.2. Interpret alarms and prioritise actions to be taken
6.3. Take appropriate action to respond to the alarm or incident
6.4. Deal with any out of specification material in accordance with procedures
6.5. Communicate the problem/solution to appropriate personnel
6.6. Record the information as required
6.7. Provide details of the alarm and action taken to the next shift at change over
This describes the essential skills and knowledge and their level, required for this unit.
Competence includes the ability to distinguish between causes of problems/alarms/fault indications such as:
equipment design deficiencies
product parameters (temperature, flows, pressure and levels)
process control system malfunction
An ability to communicate with other work groups and personnel during the operation and monitoring of this panel is considered an essential Element of this unit of competency.
The knowledge referred to in the Evidence Guide for this unit includes:
the architecture and location of the process/production equipment
specific plant process operations
interactions between plant items/processes
product specifications and tolerances
systems operating parameters
system integrity limits
process control philosophies and strategies
emergency shutdown procedures
process specific physics, chemistry and mathematics
basic science of upstream and downstream processes
relevant chemistry of the process to the level of interpreting chemical equations and manipulating factors controlling rate of reaction and yield (or equivalent physics for a physical process/biochemistry for a biochemical process) - chemistry to include both intended products and interfering reactions, eg salts, hydrates
impact of external factors, eg variations in weather, feed etc
process drawings, eg P&ID, PFD
cause and effect
basis of control for the plant/s
instrumentation and control systems, including feed forward, feed back and open control
instrumentation and control system components, eg relevant primary sensing devices, final control elements, transducers/transmitters
control loops, including PID control, set points, controlled variable, indicated variable
interaction between multiple control loops, including cascade control
impacts of changing controller settings and the limits within which changes can be made
effective communication techniques
UPS and its applications and use.
The Evidence Guide provides advice on assessment and must be read in conjunction with the Performance Criteria, Required Skills and Knowledge, the Range Statement and the Assessment Guidelines for the Training Package.
Overview of assessment
Assessment of this unit should include demonstrated competence on actual plant and equipment in a work environment. The unit will be assessed in as holistic a manner as is practical and may be integrated with the assessment of other relevant units of competency. Assessment will occur over a range of situations, which will include disruptions to normal, smooth operation.
Simulation may be required to allow for assessment of parts of this unit. Simulation should be based on the actual plant and will include walk-throughs of the relevant competency components. Simulations may also include the use of case studies/scenarios, role plays and 3D virtual reality interactive systems. In the case of evacuation training or of training for competencies practiced in life threatening situations, simulation may be used for the bulk of the training.
This unit of competency requires an application of the knowledge contained in the use of the process control system and its integral equipment, to the level needed to maintain control and recognise and resolve problems. This can be assessed through questioning and the use of what-if scenarios both on the plant (during demonstration of normal operations and walk-throughs of abnormal operations) and off the plant.
Critical aspects for assessment and evidence required to demonstrate competency in this unit
Competence must be demonstrated in the ability to recognise and analyse potential situations requiring action and then in implementing appropriate responses. The emphasis should be on the ability to stay out of trouble rather than on recovery from a disaster.
Consistent performance should be demonstrated. In particular look to see that:
early warning signs of equipment/processes needing attention or with potential problems are recognised
the range of possible causes can be identified and analysed and the most likely cause determined
appropriate action is taken to ensure a timely return to full performance
obvious problems in related plant areas are recognised and an appropriate contribution made to their solution.
These aspects may be best assessed using a range of scenarios/case studies/what-ifs as the stimulus with a walk-through forming part of the response. These assessment activities should include a range of problems, including new, unusual and improbable situations, which may have been generated from the past incident history of the plant, incidents on similar plants around the world, hazard analysis activities and similar sources.
Context of and specific resources for assessment
Assessment will require access to a process control system over an extended period of time, or a suitable method of gathering evidence of operating ability over a range of situations. A bank of scenarios/case studies/what-ifs will be required as will a bank of questions which will be used to probe the reasoning behind the observable actions.
Method of assessment
In all plants it may be appropriate to assess this unit concurrently with relevant teamwork, communication and leadership units.
Guidance information for assessment
Assessment processes and techniques must be culturally appropriate and appropriate to the oracy, language and literacy capacity of the assessee and the work being performed.
The Range Statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicized wording, if used in the Performance Criteria, is detailed below. Add any essential operating conditions that may be present with training and assessment depending on the work situation, needs if the candidate, accessibility of the item, and local industry and regional contexts.
Codes of practice/ standards
Where reference is made to industry codes of practice, and/or Australian/international standards, the latest version must be used.
This unit of competency includes all such items of equipment and unit operations which form part of the control system. For your control room this may include (select relevant items):
process control systems, eg Distributed Control Systems
fire and gas detection/protection systems
emergency shutdown systems
Typical problems for your plant may include:
loss of power/utilities
analysing failure modes
variation/loss of feed
unstable control of pressure, temperature level and flows
control equipment failure
process plant trips
change in atmospheric conditions (rain, temperature, wind, lightning)
Alarms or abnormal conditions
Alarms or other abnormal conditions includes:
emergency, including emergency shut down
partial or complete controller failure.
Other problems includes:
problem solving control functions
Appropriate action includes:
determining problems needing action
determining possible fault causes
rectifying problem using appropriate solution within area of responsibility
following through items initiated until final resolution has occurred
reporting problems outside area of responsibility to designated person.
Health, safety and environment (HSE)
All operations to which this unit applies are subject to stringent health, safety and environment requirements, which may be imposed through State 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.
This unit contains employability skills.