10) This relates to the competency standard unit as a whole providing the range of contexts and conditions to which the Performance Criteria apply. It allows for different work environments and situations that will affect performance. Complex valves may include double seated pressure and flow control valves 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, e.g. chemical, heat, dust, noise, gas and oil, Isolations can refer to electrical/mechanical or other associated processes. Generic terms are used throughout this Training Package for vocational standard shall be regarded as part of the Range Statement in which competency is demonstrated. The definition of these and other terms are given in Section 2.1 Preliminary Information and Glossaries. |