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Q1— Section header —
1.1Indicate whether the following statements are TRUE or FALSE. Choose the correct answer and write only 'True' or 'False' next to the question number (1.1.1
1.1.10\n the ANSWER BOOK.
1.1.1Permanent hard water is caused by the presence of sulphate of calcium and magnesium in the water.
1.1.2Pressure or mechanical filter is a square tank with a diameter of approximately 1,2 m to 2,5 m with a spherical side and bottom. 1. .3 A w ater reticulation system is a network of piping deep down under
1.1.4Filtration is a process in the geyser that removes cold water from the pipes.
1.1.5A p illar type hydrant gets water directly from the water reticulation network in the street.
1.1.6A b all valve regulates the cold water from the geyser.
1.1.7Water hammer is a pressure surge or wave caused when a fluid in motion is forced to stop or change direction suddenly.
1.1.8Sterilisation of water is when chlorine is added to the water to make water free from harmful bacteria and fit for human consumption.
1.1.9A t hermostatic valve is valve that forces cold water to rise to the geyser.
1.1.10
1.2List FOUR acceptable quality requirements for water, that is intended for hum an consumption. (4\
1.3hat is meant by the term pressure zone (2\
1.4How would you best describe temporary hardness of water? (3\
1.5Name ONE common impurity found in water. (1\ [20] 1102205220
Q2— Section header —
2.1Make a neat, labelled sectional sketch of a t ypical push through geyser, and show all the accompanying valves. (10\
2.2Write the correct colour coding for the following water pressure ratings:
2.2.150 kPa (1\
2.2.2400 kPa (1\
2.2.375 kPa (1\
2.3Give THREE possible functions of a pressure control valve (3\
2.4List TWO advantages and TWO disadvantages of a Latco type pressure reducing valve. (4\ [20]20
Q3— Section header —
3.1List SIX aspects that the d rainage inspector should check to ensure that it complies with the National Building Regulations. (6\
3.2Write the following standard sanitary and miscellaneous abbreviation in full:
3.2.1ABC
3.2.3RE
3.2.5
3.3Describe the function of the water seal in a trap. (3\ (11022052\ Copyright reserved
3.4Design an effective drain age layout of the domestic dwelling shown on the given DIAGRAM SHEET. Label and describe all the pipes and fittings required to complete the installation. Write your EXAMINATION NUMBER in the space provided and place the
3.5Before a septic tank can be installed, the soil mu st be tested to ensure suitability for the French drain. List SIX possible steps to describe the test ing of the soil with reference to the
Q4— Section header —
4.1hat are flashing s? (2\
4.2Show by means of a neat sketch how flashing should be fixed against a parapet wall of a flat roof and label the parts (8
4.3Give FIVE possible areas where flashing could be fitted on building (5\
Q5— Section header —
5.1A drain pipe is laid at a fall of 1:28 and has a length of 10 m between two changes of direction. Calculate the invert level at the bottom end if the invert depth is 370 mm at the head of the pipe. (5\
5.2Calculate the amount of material required to manufacture a water tank with a diameter of 1,3 m and a height of 900 mm. The tank is open at the top. Do not make any allowance for seams. [10] TOTAL: 10010