Hot And Cold Wter Supply

Question 1

Under normal circumstances at what height does the water in the vent pipe stand?

Answer 1

1/16 of height from the bottom to the water level.

Question 2

What is the vent pipe sometimes mistakenly known as?

Answer 2

Expansion pipe

Question 3

Will the hot water cylinder empty during normal use if the cistern empties of water?

Answer 3

Ask mike.

Question 4

Explain where the direct pipe is on a direct hot water system.

Answer 4

It is 1/16 of the bottom of the cylinder to the cistern water level.

Question 5

Explain where the cold feed is on a direct hot water system.

Answer 5

It is below the cold distribution pipe.

Question 6

Why are boilers used on a direct system made from stainless steal or copper?

Answer 6

It is used because it prevents corrosion and discolouration of the water.

Question 7

Explain the term 1 pipe circulation.

Answer 7

The circulator flow return of hot water takes place in the same pipe due to convection currents.

Question 8

How is 1 pipe circulation prevented?

Answer 8

It is from the top of the cylinder you run a horizontal pipe from 457mm to the vent pipe.

Question 9

List 3 functions of the vent pipe.

Answer 9

It maintains atmospheric conditions in pipe work, permits the escape of air and in the event of the water becoming overheard it allow it to discharged over feed cisterns.

Question 10

How high above the water level should the vent pipe rise before turning back down towards the cistern?

Answer 10

It should be continued over the water level of 1/16 the height of the bottom of the cylinders to the water levels in the cisterns.

Question 11

Give 2 reasons why the vents should travel up above the water level as I’m question before.

Answer 11

1. Prevents expanding water from pitching into the cistern and gathering air.
2. The vent should be terminate about overflow levels in the cistern and preferably below the flood level.

Question 12

Where should the vent pipe terminate over the cold water storage cistern?

Answer 12

It must be above the overflow level of the cistern and preferably below the flood levels.

Question 13

Which water system best supports stratification?

Answer 13

Indirect.

Question 14

How is stratification prevented?

Answer 14

Ask mike.

Question 15

Define a boiler?

Answer 15

It is made from caste iron, illiumion or copper. If made from caste iron rusting or discolouration of the water does not cause problems because water is never changing.

Question 16

What is the main advantage of a gas boiler?

Answer 16

It is clean and effective,

Question 17

What are tempering or mixing/blending valves used for?

Answer 17

Termastatic mixing valves are used to control temperature of water to the tap or shower

Question 18

Name two places where they must be used.

Answer 18

1. Baths.

2. Wash basins.

Question 19

Give 3 reasons why water should be stored at 65C if it can cause burns.

Answer 19

1. Kills bacteria.
2. Allows a acquit quantity of water.
3. Used in many kitchens.

Question 20

List 2 ways in which a plumber can help to prevent the possibility of scalding.

Answer 20

1. Thermostatic showers mixers.

2. Cold feeds to cyclinder should be placed at higher levels than cold distribution pipe on storage cisterns.

Question 21

List 3 places where an airlock may develop on a plumbing system.

Answer 21

1. Sagging pipes
2. When not laid horizontically.
3. Appropriate falls.

Question 22

How do airlock form In fresh water supplies?

Answer 22

Air bubbles form when water is heated and when water pressure is lowered down

Question 23

What is the method of heat transfer of transferring hot water from a boilder to a cyclinder above without the aid of a pump?

Answer 23

Ask mike.

Question 24

What is the direct system of hot water supply?

Answer 24

Ask.