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Elements and Performance Criteria
Performance Evidence
The candidate must demonstrate the ability to complete the tasks outlined in the elements, performance criteria and foundation skills of this unit, including evidence of the ability to:
conduct reverse circulation drilling operations on at least two occasions. During the above, the candidate must:locate and apply required documentation, policies and proceduresimplement the requirements, procedures and techniques for the completion of reverse circulation drilling, including:applying prescribed thread form torque parameters during make-up of down hole equipment and consumablesapplying correct internal and external calipers, vernier, rule and or tape measure for identification of drill pipe/rod diameter wear limits, measurement of bits/shrouds and other required down hole equipmentapplying correct measurement of drill string lengthapplying methods for calculating hole depthwork with others to conduct reverse circulation drilling tasks that meets required outcomes, including:complying with written and verbal reporting requirements and procedurescommunicating with others to receive and clarify work instructionscommunicating with others to determine coordination requirements prior to commencing and during work activities.
Knowledge Evidence
The candidate must be able to demonstrate knowledge to complete the tasks outlined in the elements, performance criteria and foundation skills of this unit, including knowledge of:
key policies, procedures and established requirements for conducting reverse circulation drilling, including those for: work health and safetyemergenciesenvironmental practiceoperating drill righousekeepingthe importance to match like threads with like threads on all threaded components and make up torque requirements applicable to thread form in usethe relationship between pressure, volume, hole diameter, rod diameter and calculation of up hole velocitydrill rod and thread form wear limit parametersthe need for correct hole collaring, use of casing and collar sealing techniquesmethods for complying with the tungsten carbide (TC) bit sharpening procedurespotential problems related to inaccurate measurement and usage sequence of ground engaging consumables and related down hole componentshazard control measures to enable safe use of compressed airthe importance of ensuring sample quantity including the prevention of blockagessafe procedures to clear down and up hole drill cuttings blockages within the outside hole return, down hole equipment and up hole sample system and/or hosethe critical need for correct fitting, inspection, maintenance and replacement of restraining deviceshazards associated with the collection of high velocity drilling cuttingsreasons for checking inner tubes and inner tube sealing devices in RC drill rodhazards associated with wire-line operations and applicable control measuresthe various thread forms used in reverse circulation drillingthe various in-hole tools and correct application given ground conditionsthe need for managing uncontaminated samples.