Elements and Performance Criteria

Stream: Production Plant
Field: Maintenance
Equivalencies: This unit of competence incorporates unit 18.4A and 10.6A of the
National Metal and Engineering Competency Standard
Complex valves may include double seated pressure and flow control valves, boiler safety valves, and valves whose actuators are an integral part of the valve and so must be part of any maintenance to the valve.
Precision measuring devices may include inside/outside micrometers, verniers, engineer's rule, dial gauges, depth gauges and feeler gauges
Testing may include pressure testing (hydraulic and vacuum), blue check and non-destructive testing
Valve may control solutions which may include gases; solids; and fluids and chemicals such as caustic soda, chlorine, ammonia, sulphuric acid, sodium hypochlorite, hydrazine, diethylamine, citric acid, hydrofluoric acid, ammonium molydate, trisodium phosphate, hydrogen, nitrogen, carbon dioxide, water, fly-ash, slurry, compressed air, brine, oil, steam (superheated and saturated), hydrogen, propane and carbon dioxide
Details of maintenance may be clarified by diagnosis and workplace inspection
Maintenance may include repair, inspection, modification, overhaul, lubrication, servicing, test running, sealing, machining, identifying and replacing defective components and valve packing
Valve drives may include electrical, mechanical, pneumatic, hydraulic or manual
Work completion details may include plant and maintenance records, job cards, check sheets, on device labelling updates and reporting and/or documenting equipment defects
Work site environment may be affected by nearby plant or processes, eg chemical, heat, dust, noise, gas and oil
Isolations can refer to electrical/mechanical or other associated processes

Critical aspects of evidence
It is essential that competence is assessed in the critical aspects of: the knowledge and application ofrelevant sections of occupational, health and safety legislation, statutory legislation, enterprise/site safety procedures and enterprise/site emergency procedures; preparation and planning of work; removal techniques; maintenance techniques and procedures; installation techniques and procedures; completion of work procedures
Context of assessment
Competency Standards should be assessed in the workplace or simulated workplace and under the normal range of workplace conditions.
Assessment of this unit will be supported with documentary evidence, by means of endorsement stating type and application of work.
Knowledge and Skills
A knowledge of:operating and seating arrangements; hydraulic and pneumatic principles; measuring equipment; glands, seals and gaskets; bearings; occupational health and safety standards; quality assurance/quality control; specialised tools and jigs; levelling and aligning; rigging and lifting equipment; valve materials and components; technical drawings and data; data recording techniques; hand and portable power tools; diagnostic and testing techniques; protective coatings; plant and systems; blowdown duration and valve lift; communication principles
The ability to:
Identify and use precision measuring equipment; manufacture and install seals and gaskets; apply dismantling and assembly techniques; select, manufacture and use specialised tools and jigs; level and align; use technical drawings and data; identify and select materials and components; use hand and portable power tools; apply diagnostic and testing techniques and rectify faults; apply protective coatings; interpret and apply valve operational techniques; apply occupational health and safety procedures; recognise worn/damaged components; apply effective maintenance procedures; apply data analysis techniques and tools; communicate effectively