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Text C

Text B

Unit 3. Fluid Containment

Speak Up! Discuss these questions with a partner.

Think about some appliances, machines or structures where heat transfer is an important consideration. How is this heat transferred, and how does this affect the design?

Text A

Exercise 1.One sentence in each pair is false. Choose the true sentence. Look at A and B opposite.

1. a All gas cylinders are pressure vessels. b All pressure vessels are gas cylinders

2. a Elbows are types of pipe or hose fitting. b Pipe or hose fittings are types of elbow.

3. a Any watertight tank will also be airtight. b All tanks are types of pressure vessel.

4. a A pipe is a specific sort of pipeline. b A pipeline is a specific sort of pipe.

Exercise 2.Change one word in each of the sentence below to make them correct. Look at C opposite.

1. A fan is designed to be driven by a flow of air and gas.

2. A pump used to increase the pressure in a vessel is called a turbine.

3. A safety valve is an inlet which releases excess pressure.

4. A non-turn valve is also called a safety valve.

5. Some valves can be partly closed to stop a flow, reducing its rate.

Exercise 3.Complete the sentences below with these words.

include consist of carry revolves rely on run

1. Pipes are rigid tubes, made from materials such as steel and plastic, and they ______ fluids.

2. Water mains and gas mains _____ beneath the streets of cities to supply buildings.

3. Drains are underground pipes that carry waste water and they _____ gravity to allow them to flow.

4. Ducts are pipes used for moving air that is not under pressure – usually for heating or air-conditioning and ductwork often _____ rectangular cross-section ducts.

5. Pressure vessels _____ small portable gas cylinders (also called gas bottles).

6. A wind turbine _____ due to the wind, and can be used to drive a generator.


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