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Elements and Performance Criteria

  1. Prepare for purging.
  2. Identify purge requirements.
  3. Carry out and test purge operation.
  4. Clean up.

Required Skills

Required skills

Required skills for this unit are

communication skills to

access information

complete workplace documentation

determine requirements

enable clear and direct communication using questioning to identify and confirm requirements share information listen and understand

follow instructions

inform relevant authorities and supervisors of completion of job

plan work with others

read and interpret

documentation from a variety of sources

drawings and specifications

record data in writing

use language and concepts appropriate to cultural differences

use and interpret nonverbal communication such as hand signals

determining purging requirements of a consumer gas piping system in terms of volume method and medium of purge

conducting purging and testing for its completeness

identifying and accurately reporting to appropriate personnel any faults in tools equipment or materials

numeracy skills to apply measurements and calculations

organisational skills including the ability to plan and set out work

teamwork skills to work with others to action tasks and relate to people from a range of cultural and ethnic backgrounds and with varying physical and mental abilities

technological skills to

access and understand sitespecific instructions in a variety of media

use mobile communication technology

Required knowledge

Required knowledge for this unit is

characteristics of materials used in the purging process

effect of heat on the materials used during the purging and testing process

electrical safety and requisite precautions

how to access relevant information including codes and technical standards

job safety analysis JSA and safe work method statements SWMS

procedures for purging gas piping systems including isolation processes and procedures

properties of gas gas safety combustion principles ignition principles pressure and flow rates

relevant statutory and authority requirements related to purging gas piping systems

SI system of measurements

workplace and equipment safety requirements

Evidence Required

The evidence guide provides advice on assessment and must be read in conjunction with the performance criteria required skills and knowledge range statement and the Assessment Guidelines for the Training Package

Overview of assessment

This unit of competency could be assessed in the workplace or a close simulation of the workplace environment providing that simulated or projectbased assessment techniques fully replicate plumbing and services workplace conditions materials activities responsibilities and procedures

Critical aspects for assessment and evidence required to demonstrate competency in this unit

A person who demonstrates competency in this unit must be able to provide evidence of

locating interpreting and applying relevant information standards and specifications for determining requirements and purging and testing consumer gas piping systems

applying safety requirements throughout the work sequence including the use of personal protective clothing and equipment and the elimination of possible ignition sources

as a minimum the ability to given the plans and specifications conduct purging testing and recording of the purge operations one to be a fuel and inert purge and the other to be an inert and fuel purge for a consumer gas piping system of greater than cubic metres which includes a subsidiary meter ensuring

correct identification of method medium calculations and procedures to purge the piping system

correct selection and use of appropriate processes tools and equipment

completing all work to specification

compliance with regulations standards and organisational quality procedures and processes

communicating and working effectively and safely with others

Context of and specific resources for assessment

This competency is to be assessed using standard and authorised work practices safety requirements and environmental constraints

Assessment of essential underpinning knowledge will usually be conducted in an offsite context

Assessment is to comply with relevant regulatory or Australian standards requirements

Resource implications for assessment include

an induction procedure and requirement

realistic tasks or simulated tasks covering the minimum task requirements

relevant specifications and work instructions

tools and equipment appropriate to applying safe work practices

support materials appropriate to activity

workplace instructions relating to safe working practices and addressing hazards and emergencies

material safety data sheets

research resources including industry related systems information

Reasonable adjustments for people with disabilities must be made to assessment processes where required This could include access to modified equipment and other physical resources and the provision of appropriate assessment support

Method of assessment

Assessment methods must

satisfy the endorsed Assessment Guidelines of the Construction Plumbing and Services Training Package

include direct observation of tasks in real or simulated work conditions with questioning to confirm the ability to consistently identify and correctly interpret the essential underpinning knowledge required for practical application

reinforce the integration of employability skills with workplace tasks and job roles

confirm that competency is verified and able to be transferred to other circumstances and environments

Validity and sufficiency of evidence requires that

competency will need to be demonstrated over a period of time reflecting the scope of the role and the practical requirements of the workplace

where the assessment is part of a structured learning experience the evidence collected must relate to a number of performances assessed at different points in time and separated by further learning and practice with a decision on competency only taken at the point when the assessor has complete confidence in the persons demonstrated ability and applied knowledge

all assessment that is part of a structured learning experience must include a combination of direct indirect and supplementary evidence

Assessment processes and techniques should as far as is practical take into account the language literacy and numeracy capacity of the candidate in relation to the competency being assessed

Supplementary evidence of competency may be obtained from relevant authenticated documentation from third parties such as existing supervisors team leaders or specialist training staff


Range Statement

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 italicised wording, if used in the performance criteria, is detailed below. Essential operating conditions that may be present with training and assessment (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) may also be included.

Safety (OHS) is to be in accordance with commonwealth, state and territory legislation and regulations and may include:

handling of materials

hazard control

personal protective clothing and equipment prescribed under legislation, regulations and workplace policies and practices

safe operating procedures, including recognising and preventing hazards associated with:

hazardous materials and substances

service lines

surrounding structures and facilities

trip hazards

use of tools and equipment

work site visitors and the public

working at heights

working in proximity to others

use of firefighting equipment

use of first aid equipment

workplace environment and safety.

Environmental requirements include:

clean-up protection

waste management.

Quality assurance requirements may include:

Australian standards

Environment Protection Authority (EPA)

internal company quality assurance policy and risk management strategy

International Standards Organisation

site safety plan

workplace operations and procedures.

Tools and equipment may include:

barriers

buckets

gas analyser

hand and power tools

ladders

purge stacks

restricted height scaffolding

signs

testing equipment.

Purging:

may occur before commencing work and on completion of work using either air, fuel gas or an inert gas on pipe volumes up to and exceeding 0.03 cubic metres, to applicable regulatory requirements

installation to be purged, calculations, method, medium and conduct of purging is to conform to standards or requirements of local regulatory authority

methods of purging are to include:

fuel and inert purge

inert and fuel purge.

Materials for purging may include:

purging media of air, nitrogen, carbon dioxide or fuel gas.

Statutory and regulatory authorities include:

state or territory statutory authority

statutory gasfitting authority

statutory plumbing authority.

Information may include:

charts and hand drawings

diagrams or sketches

instructions issued by authorised organisational or external personnel

job drawings

manufacturer specifications and instructions

material safety data sheets (MSDS)

memos

organisation work specifications and requirements

regulatory and legislative requirements, particularly those pertaining to:

building codes

OHS and environmental requirements

plumbing and gasfitting authority regulations

recognised formulas or tables accepted by the regulatory authority

relevant Australian standards

safe work procedures relating to purging and testing consumer gas piping systems

signage

verbal, written and graphical instructions

work bulletins

work schedules, plans and specifications.