Assessor Resource

NWPTRT013
Operate and control liquefied chlorine gas disinfection

Assessment tool

Version 1.0
Issue Date: March 2024


This unit describes the skills required to monitor and operate liquefied chlorine gas disinfection systems and report on process quality control whilst working safely. This includes being able to demonstrate correct use of self-contained breathing apparatus.

This unit applies to those working as operational staff with specific responsibility for disconnecting and connecting liquefied chlorine gas containers in water and wastewater treatment plants.

The skills and knowledge described in this unit must be applied within the legislative, regulatory and policy environment in which they are carried out. Organisational policies and procedures must be consulted and adhered to including WHS and handling dangerous goods.

Those undertaking this unit would work under supervision, while performing routine tasks, in a range of familiar contexts.

No licensing, legislative or certification requirements apply to unit at the time of publication.

You may want to include more information here about the target group and the purpose of the assessments (eg formative, summative, recognition)



Evidence Required

List the assessment methods to be used and the context and resources required for assessment. Copy and paste the relevant sections from the evidence guide below and then re-write these in plain English.

ELEMENTS

PERFORMANCE CRITERIA

Elements describe the essential outcomes

Performance criteria describe the performance needed to demonstrate achievement of the element. Where bold italicised text is used, further information is detailed in the range of conditions section.

1. Prepare to work with liquefied chlorine gas

1.1 Check work procedures and instructions for compliance.

1.2 Check hazard signage for compliance.

1.3 Select and check tools and equipment.

1.4 Check first aid provisions for potential liquefied chlorine gas exposure hazards.

1.5 Select, fit and use personal protective equipment.

2. Perform liquefied chlorine gas container changeover procedures

2.1 Obtain and handle liquefied chlorine gas containers from the correct storage area.

2.2 Conduct connection and disconnection procedures for chlorine gas draw or chlorine liquid draw systems.

2.3 Move depleted containers within storage area.

2.4 Check and store tools and equipment.

3. Monitor process performance

3.1 Conduct and perform process tests and compare performance to process operational requirements.

3.2 Set critical control point dosing points according to organisation procedures.

3.3 Maintain and monitor relevant WHS requirements.

3.4 Make process adjustments as required to maintain effectiveness of the disinfection system.

4. Complete documentation

4.1 Collect and record process data.

4.2 Report observations outside defined parameters for further action.

Evidence required to demonstrate competence must satisfy all of the requirements of the elements and performance criteria. To be deemed competent the candidate must be assessed in at least one type of handling procedure, using at least one type of chlorine draw and at least one type of container listed in the Range of Conditions. If not otherwise specified the candidate must demonstrate evidence of performance of the following on at least one occasion.

applying correct liquefied chlorine gas container procedures for transport, handling and storage

operating safely and following procedure when disconnecting and reconnecting gas draw or liquid draw chlorinator systems

interpreting safety data sheets (SDS)

selecting, fitting and using PPE, including air supplied self-contained breathing apparatus

implementing relevant Australian standards, SDS requirements and other legislative and organisational requirements

following emergency protocols and procedures relating to liquefied chlorine gas hazards

collecting samples and conducting tests, including at least one of:

free chlorine

total chlorine

pH

turbidity

temperature

performing process calculations, including at least one of:

feed rate

dosage

Ct.

Evidence required to demonstrate competence must satisfy all of the requirements of the elements and performance criteria. If not otherwise specified the depth of knowledge demonstrated must be appropriate to the job context of the candidate.

personal protective equipment and its application

self-contained breathing apparatus

emergency equipment and its application

properties of liquefied chlorine gas

basic function and components of gas draw or liquid draw chlorinator systems

hazards of liquefied chlorine gas handling

safety data sheet (SDS)

procedures for liquefied chlorine gas container for transport, handling and storage

maintenance procedures for personal protective equipment

AS/NZS 2927 The storage and handling of liquefied chlorine gas

relevant federal and state or territory legislation and regulations

codes of practice, associated standards and guidance material

documented organisational policies, manuals and induction programs

microbiological guidelines

reactions with water to produce hypochlorous/hypochlorite ion

impact of pH on above

chlorine demands

disinfection by-products

breakpoint

contact time

Ct.

chlorine residuals

Competency should be assessed in an actual workplace or in a simulated environment, with access to equipment and infrastructure appropriate to the outcome. Competency should be demonstrated over time to ensure the candidate is assessed across a variety of situations.

Some components of this unit require assessment in a workplace environment therefore the unit is not suitable for fully external or electronic based assessment.

Assessors must satisfy the NVR/AQTF mandatory competency requirements for assessors.


Submission Requirements

List each assessment task's title, type (eg project, observation/demonstration, essay, assingnment, checklist) and due date here

Assessment task 1: [title]      Due date:

(add new lines for each of the assessment tasks)


Assessment Tasks

Copy and paste from the following data to produce each assessment task. Write these in plain English and spell out how, when and where the task is to be carried out, under what conditions, and what resources are needed. Include guidelines about how well the candidate has to perform a task for it to be judged satisfactory.

ELEMENTS

PERFORMANCE CRITERIA

Elements describe the essential outcomes

Performance criteria describe the performance needed to demonstrate achievement of the element. Where bold italicised text is used, further information is detailed in the range of conditions section.

1. Prepare to work with liquefied chlorine gas

1.1 Check work procedures and instructions for compliance.

1.2 Check hazard signage for compliance.

1.3 Select and check tools and equipment.

1.4 Check first aid provisions for potential liquefied chlorine gas exposure hazards.

1.5 Select, fit and use personal protective equipment.

2. Perform liquefied chlorine gas container changeover procedures

2.1 Obtain and handle liquefied chlorine gas containers from the correct storage area.

2.2 Conduct connection and disconnection procedures for chlorine gas draw or chlorine liquid draw systems.

2.3 Move depleted containers within storage area.

2.4 Check and store tools and equipment.

3. Monitor process performance

3.1 Conduct and perform process tests and compare performance to process operational requirements.

3.2 Set critical control point dosing points according to organisation procedures.

3.3 Maintain and monitor relevant WHS requirements.

3.4 Make process adjustments as required to maintain effectiveness of the disinfection system.

4. Complete documentation

4.1 Collect and record process data.

4.2 Report observations outside defined parameters for further action.

Handling procedures include:

transport and handling of liquefied chlorine gas containers

container disconnection and connection procedures for chlorine gas or chlorine liquid draw systems

storage of liquefied chlorine gas cylinders or drums

Types of chlorine draw include:

liquid draw

gas draw

Types of containers include:

cylinders

drums

tanker deliveries

Evidence required to demonstrate competence must satisfy all of the requirements of the elements and performance criteria. To be deemed competent the candidate must be assessed in at least one type of handling procedure, using at least one type of chlorine draw and at least one type of container listed in the Range of Conditions. If not otherwise specified the candidate must demonstrate evidence of performance of the following on at least one occasion.

applying correct liquefied chlorine gas container procedures for transport, handling and storage

operating safely and following procedure when disconnecting and reconnecting gas draw or liquid draw chlorinator systems

interpreting safety data sheets (SDS)

selecting, fitting and using PPE, including air supplied self-contained breathing apparatus

implementing relevant Australian standards, SDS requirements and other legislative and organisational requirements

following emergency protocols and procedures relating to liquefied chlorine gas hazards

collecting samples and conducting tests, including at least one of:

free chlorine

total chlorine

pH

turbidity

temperature

performing process calculations, including at least one of:

feed rate

dosage

Ct.

Evidence required to demonstrate competence must satisfy all of the requirements of the elements and performance criteria. If not otherwise specified the depth of knowledge demonstrated must be appropriate to the job context of the candidate.

personal protective equipment and its application

self-contained breathing apparatus

emergency equipment and its application

properties of liquefied chlorine gas

basic function and components of gas draw or liquid draw chlorinator systems

hazards of liquefied chlorine gas handling

safety data sheet (SDS)

procedures for liquefied chlorine gas container for transport, handling and storage

maintenance procedures for personal protective equipment

AS/NZS 2927 The storage and handling of liquefied chlorine gas

relevant federal and state or territory legislation and regulations

codes of practice, associated standards and guidance material

documented organisational policies, manuals and induction programs

microbiological guidelines

reactions with water to produce hypochlorous/hypochlorite ion

impact of pH on above

chlorine demands

disinfection by-products

breakpoint

contact time

Ct.

chlorine residuals

Competency should be assessed in an actual workplace or in a simulated environment, with access to equipment and infrastructure appropriate to the outcome. Competency should be demonstrated over time to ensure the candidate is assessed across a variety of situations.

Some components of this unit require assessment in a workplace environment therefore the unit is not suitable for fully external or electronic based assessment.

Assessors must satisfy the NVR/AQTF mandatory competency requirements for assessors.

Copy and paste from the following performance criteria to create an observation checklist for each task. When you have finished writing your assessment tool every one of these must have been addressed, preferably several times in a variety of contexts. To ensure this occurs download the assessment matrix for the unit; enter each assessment task as a column header and place check marks against each performance criteria that task addresses.

Observation Checklist

Tasks to be observed according to workplace/college/TAFE policy and procedures, relevant legislation and Codes of Practice Yes No Comments/feedback
Check work procedures and instructions for compliance. 
Check hazard signage for compliance. 
Select and check tools and equipment. 
Check first aid provisions for potential liquefied chlorine gas exposure hazards. 
Select, fit and use personal protective equipment. 
Obtain and handle liquefied chlorine gas containers from the correct storage area. 
Conduct connection and disconnection procedures for chlorine gas draw or chlorine liquid draw systems. 
Move depleted containers within storage area. 
Check and store tools and equipment. 
Conduct and perform process tests and compare performance to process operational requirements. 
Set critical control point dosing points according to organisation procedures. 
Maintain and monitor relevant WHS requirements. 
Make process adjustments as required to maintain effectiveness of the disinfection system. 
Collect and record process data. 
Report observations outside defined parameters for further action. 
Check work procedures and instructions for compliance. 
Check hazard signage for compliance. 
Select and check tools and equipment. 
Check first aid provisions for potential liquefied chlorine gas exposure hazards. 
Select, fit and use personal protective equipment. 
Obtain and handle liquefied chlorine gas containers from the correct storage area. 
Conduct connection and disconnection procedures for chlorine gas draw or chlorine liquid draw systems. 
Move depleted containers within storage area. 
Check and store tools and equipment. 
Conduct and perform process tests and compare performance to process operational requirements. 
Set critical control point dosing points according to organisation procedures. 
Maintain and monitor relevant WHS requirements. 
Make process adjustments as required to maintain effectiveness of the disinfection system. 
Collect and record process data. 
Report observations outside defined parameters for further action. 

Forms

Assessment Cover Sheet

NWPTRT013 - Operate and control liquefied chlorine gas disinfection
Assessment task 1: [title]

Student name:

Student ID:

I declare that the assessment tasks submitted for this unit are my own work.

Student signature:

Result: Competent Not yet competent

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Assessor name:

Signature:

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Assessment Record Sheet

NWPTRT013 - Operate and control liquefied chlorine gas disinfection

Student name:

Student ID:

Assessment task 1: [title] Result: Competent Not yet competent

(add lines for each task)

Feedback to student:

 

 

 

 

 

 

 

 

Overall assessment result: Competent Not yet competent

Assessor name:

Signature:

Date:

Student signature:

Date: