Direct And Indirect Cold Water Supply Flashcards Preview

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Flashcards in Direct And Indirect Cold Water Supply Deck (11)
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1

Why is a grid system used?

It provides a circuit so that each section can be isolated in the case of a burst pipes.

2

What are mains made from?

1. PVC.
2. Asbestos cement.
3. Caste iron.

3

How is a caste iron mains pipe tapped?

By using a under pressure mains tapping system.

4

How far should a water mains be below the road?

900ml

5

How far should a water mains be below the footpath or else were besides the road?

750ml

6

Name the section of pipe work which lines between the water mains and the local authority stop valve.

Communication pipe.

7

State what is fitted to the rising pipe at point of entry to a premises.

Service pipe.

8

Where ideally should the rising mains pipe be located?

After the draining valve.

9

Why should you not fit a gate valve on the rising mains?

Ask mike

10

What is the purpose of fitting a drain valve on the rising mains?

It allows the pipe to drain away water.

11

What are water mains?

It is the pipes used to carry drinking water in large diameters.