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Isolate and tag plant and equipment, and remove danger tags, on a gas
transmission pipeline system

Level                              3

Credits                            5

Purpose       This unit standard is for people working, or intending to work, in the gas
              transmission industry.

              People credited with this unit standard are, on a gas transmission pipeline
              system, able to: isolate electrical circuits and/or equipment and install danger
              tags; isolate piped sources of energy and install danger tags; isolate
              mechanical sources of energy and install danger tags; complete
              documentation and danger tag labelling for isolating sources of energy and
              installing danger tags; and remove danger tags.


Subfield                           Gas Industry

Domain                             Gas Transmission Operations

Status                             Registered

Status date                        22 May 2009

Date version published             22 May 2009

Planned review date                31 December 2014

Entry information                  Open.

Accreditation                      Evaluation of documentation and visit by NZQA and
                                   industry.

Standard setting body (SSB)        NZ Extractive Industries Training Organisation

Accreditation and Moderation Action Plan (AMAP) reference                    0114
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.

Special notes

1   Performance of the elements of this unit standard must comply with relevant site
    requirements and the Health and Safety in Employment Act 1992.




                                                                 New Zealand Qualifications Authority 2012
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2     This procedure covers the isolation of potentially hazardous sources of energy and
      the use of Danger, Do Not Operate tags (danger tags). It includes the use and
      removal of these tags to facilitate the safe completion of repairs, maintenance, and
      operations. Danger tags should be weatherproof tags with waterproof markers and
      plastic cable ties, where possible.

3     Definition
      Company procedures refer to the documented methods for performing work activities
      and include health and safety, environmental, quality management requirements and
      site requirements. They may refer to manuals, codes of practice, or policy
      statements.

Elements and performance criteria

Element 1

Isolate electrical circuits and/or equipment and install danger tags on a gas transmission
pipeline system.

Performance criteria

1.1        A full current isolating switch or circuit breaker is opened and, where the facility
           exists, locked in the open position in accordance with company procedures and
           the work permit for the job.

1.2        Danger tags are installed in accordance with company procedures and the work
           permit for the job.

Element 2

Isolate piped sources of energy and install danger tags on a gas transmission pipeline
system.

Range      may include but is not limited to – natural gas, LPG.

Performance criteria

2.1        Pipe is opened and the open pipe end is blanked with a line rated blind flange in
           accordance with company procedures and the work permit for the job.

2.2        The nearest valve is locked closed and a danger tag is installed in accordance
           with company procedures and the work permit for the job.

2.3        A full line rated spade is inserted as close as possible to the work area in
           accordance with company procedures and the work permit for the job.

2.4        The two adjacent valves in pipe (block valves) are locked open to atmosphere
           in accordance with company procedures.




                                                                  New Zealand Qualifications Authority 2012
                                                                              25315 version 1
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2.5       Valves (double block and bleed) are locked closed, a drain valve (bleed valve)
          is located between the two block valves, and a danger tag is installed on each
          valve in accordance with company procedures.

2.6       Valves fitted with body bleeds (double block and bleed) are locked closed, the
          two adjacent valves are located in pipe (block valves) and opened to
          atmosphere, and a danger tag is installed on the two block valves in
          accordance with company procedures.

Element 3

Isolate mechanical sources of energy and install danger tags on a gas transmission
pipeline system.

Performance criteria

3.1       Moving parts that pose a risk to personnel are positively isolated and locked,
          and a danger tag is installed in accordance with company procedures.

          Range        fans, equipment with moving parts.

Element 4

Complete documentation and danger tag labelling for isolating sources of energy and
installing danger tags on a gas transmission pipeline system.

Performance criteria

4.1       Documentation is completed in accordance with company procedures.

          Range        may include but is not limited to – a contact number, reason for
                       placement, permit number (if used), status.

4.2       Danger tags are labelled in accordance with company procedures.

Element 5

Remove danger tags on a gas transmission pipeline system.

Performance criteria

5.1       Danger tags are removed at the conclusion of the risk in accordance with
          company procedures.




                                                               New Zealand Qualifications Authority 2012
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Please note

Providers must be accredited by NZQA, or an inter-institutional body with delegated
authority for quality assurance, before they can report credits from assessment against
unit standards or deliver courses of study leading to that assessment.

Industry Training Organisations must be accredited by NZQA before they can register
credits from assessment against unit standards.

Accredited providers and Industry Training Organisations assessing against unit standards
must engage with the moderation system that applies to those standards.

Accreditation requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP also includes useful information about special requirements for organisations
wishing to develop education and training programmes, such as minimum qualifications for
tutors and assessors, and special resource requirements.

Comments on this unit standard

Please contact the NZ Extractive Industries Training Organisation info@exito.org.nz if you
wish to suggest changes to the content of this unit standard.




                                                               New Zealand Qualifications Authority 2012

				
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