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72
systems. These control methods of corrosion are anti-bacterial. Without them,
steel boilers and radiators can through in 10 years.
Block B
Lexical exercises
I. Answer the questions:
1. What do you know about the sources of water and the methods used for its
storage and treatment?
2. What pollutants are present in naturally occurring water and where do they
come from?
3. What do the terms “temporary” and “permanent” hardness mean? List their
characteristics.
4. Which water distribution methods do you know?
5. What are the factors involved in the provision of a pipework system for the
conveyance of drinking water within a cartilage?
II. Join parts of the following sentences:
1. Black mild steel is used…
2. The low-cost fuel used for the central heating plant is used…
3. Mains water is used…
4. Permanent hardness of water is due…
5. The solar distillation method can be used…
a) for the hot-water services boiler.
b) in direct from the main and as low-pressure supplies
from cold - water storage tanks.
c) the presence of the non-carbonate salts calcium sulphate, calcium
chloride, magnesium chloride and other sulphates and chlorides.
d) in hot locations.
e) in recirculatory heating systems.
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