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87
Block B
Lexical exercises
I. Answer the questions:
1. How are the
room-sealed appliances called?
2.
What is the function of the draught diverter?
3.
Why are the asbestos cement or glazed earthenware pipes built into
new chimneys?
4.
What is the liner’s diameter as the appliance flue outlet and where is
it built?
5.
How can the electric and gas meters be accommodated?
II.
Communication activities:
1. Describe the gas service entry and meter compartment arrangements
for housing.
2. Explain how a gas meter measures gas flow rate and total quantity
passed during a year.
3. List the methods of fluying gas appliances and compare them in re-
lation to their application, complexity and expected cost.
4. Explain the sequence of operation of safety and efficiency controls
on gas fired appliances.
5. Explain how to choose suitable gas pipe sizes.
Block C
Experimental work
1. The pipe from a gas meter to a boiler is 18m long and has el-
bows that cause a resistance equivalent to 25% of the measured
length. Calculate the maximum allowable pressure loss rate for
the pipeline.
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