After text activity. Exercise 1.Read and memorize using a dictionary:

I. Reading Exercises:

Exercise 1. Read and memorize using a dictionary:

Facility, match, oversized, fuel bill, excessive, undersized, cope adequately, to be on the safe side, water treatment requirements, descriptive, brass, flue gases; burner; three-pass boiler;stack outlet; rear; encase; steam drum; mud drum;upper drum; heat application; commonality  

Exercise 2. Answer the questions:

1) What does a heating system consist of?

2) How are boilers classified?

3) How are steel boilers generally divided?

4) What are the advantages of a fire-tube boiler?

5) What are the advantages of a water-tube boiler?

Exercise 3. Match the left part with the right:

1 If the boiler is oversized,	a) it may not generate enough heat in winter.
2. If the boiler is undersized,	b) "high-pressure" or "low-pressure" and "steam boiler" or "hot water boiler.
3. Boilers are classified as	c) the exact opposite of a fire-tube.
4. A water-tube design is	d) the fuel bills will be excessive.

Exercise 4. Open brackets choosing the right words:

The boiler does not directly (govern/ control) the amount of radiators fitted to the system. It is the powerof the pump and circulation of the water through (adequately /sufficiently) sized pipes that determines the (number /quantity)of radiators you can have. But the total (output /production) of all the radiators, pipes, and cylinders determines the size of the boiler.

II. Speaking Exercises:

Exercise 1. Learn the definitions: boiler; fire-tube boilers; water-tube boilers: furnace

boiler -a strong metallic vessel, usually of wrought iron plates riveted together, or a composite structure variously formed, in which steam is generated for driving engines, or for heating, cooking, or other purposes.  

Fire tube boiler-is a type of boiler in which hot gases from a fire pass through one or more tubes running through a sealed container of water.  

Water tube boileris a type of boiler in which water circulates in tubes heated externally by the fire.

Furnace - an enclosed chamber in which heat is produced to generate steam, destroy refuse, smelt or refine ores, etc.

Exercise 2. Ask questions to the given answers:

1) Question: ___________________________________?

Answer: Boilers that operate higher than 15 psig (pounds per square inch, gauge) are called "high-pressure" boilers.

2) Question: ___________________________________?

Answer: But the total output of all the radiators, pipes, and cylinders determines the size of the boiler.

3) Question: ___________________________________?

Answer: In fire-tube boilers, combustion gases pass through the inside of the tubes with water surrounding the outside of the tubes.

4) Question: ___________________________________?

Answer: In a water-tube boiler the water is inside the tubes and combustion gases pass around the outside of the tubes.

III. Writing exercises:

Exercise 1. Complete the sentences with the suggested words: design; through; furnace; mud drum; produced.

A water-tube 1 is the exact opposite of a fire-tube. Here, the water flows 2 the tubes and is encased in a 3 in which the burner fires. These tubes are connected to a steam drum and a 4. The water is heated and steam is 5 in the upper drum.

Exercise 2. Compose a story on one of the topics (up to 100 words):

“Boiler Types and Classifications”

“Fire-tube boilers”

“Water-tube boilers”

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