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L2 Plumbing Unit 6 Apply domestic cold-water system installation and maintenance techniques

Unit 6: Activity Sheet 6.6

Learner: Date:

Maintenance and decommissioning

Aims and objectives

At the end of activities 6.6A and 6.6B, learners should be able to:

describe the maintenance requirements for a:

1 stop tap

2 hot- and cold-water tap

3 float-operated valve

4 shower mixer valve describe the procedures for decommissioning hot- and cold-water systems.

Pearson Education Ltd 2011. Copying permitted for purchasing institution only. This material is not copyright free.1

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Unit 6: Activity Sheet 6.6

Learner: Date:

Activity 6.6A Maintenance and decommissioning

Answer the following questions.

1 The principles of maintenance and servicing are quite simple. What are the sixthings you need to know?

2 What are the common faults on the following taps and valves? How or where doyou isolate the faults?

a Stop taps

Common faults include:

Isolate:


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Learner: Date:

b Hot- and cold-water taps


Isolate:

c Float-operated valves:


Isolate:

d Shower mixer valves:


Isolate:


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Learner: Date:

3 What are the common faults on a full-way gate valve?

4 What does decommissioning mean?

5 Explain what the water regulations require you to do to dead legs whenpermanently decommissioning.


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Learner: Date:

Activity 6.6B Maintenance and decommissioning

Answer the questions below.

1 Imagine you have decommissioned an indirect cold-water system in an olddomestic property, in preparation for demolition. The indirect system fed a bath,washbasin and WC; the rising main fed the sink and CWSC.

Write a short report on how you did the job, including how you liaised with othersite workers.

2 How would you remove a circlip from a spindle?

a Use a chisel to prize it off.

b Use a small screwdriver to push it out.

c Use circlip pliers to open and pull off.

d Taps do not have circlips they have SOM clips.

3 If you have a water hammer problem how can this be solved?

a Replace float valve with equilibrium valve.

b Replace float valve with Portsmouth pattern valve.

c Increase pressure to system by opening stop-tap so it is fully open.

d Remove float from arm of float valve.

Note: point d would stop the water hammer but it would cause massive floodingof the house so not a recommended option!)

General point

Discuss the report with your tutor and your classmates.


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