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Metals are used for a variety of engineering purposes, depending on the properties of the metals. Certain common metals have malleable and ductile properties. If a metal is malleable it can be hammered or pressed into a new shape. Copper is a good example of this. It is also can be used for sheaths on electrical cables. Lead, like copper and tin, will resist corrosion.
Tin and wrought iron can be stretched, and also have malleable properties. The former is corrosion resistant, but wrought iron easily corrodes. Wrought iron can be used for chains and crane hooks. Neither of these two metals is a good conductor of electricity.
Cast iron is unlike the other metals because its shape cannot be altered by hammering, pressing or stretching and it is not corrosion resistant.
(Basic Technical English, Oxford University Press. 2002)
Complete the table using the information from the text. Compare and analyze.
| JOINING PIPES | ||||
| Materials | Properties | Method | Method Description | Examples Of Uses |
10. Discussion: The topic of our discussion is “Pipe Jointings”. The monitoring packet includes four parts. Do the tasks. After which you have 10-15 minutes to make a mini-report and present it.
Part 1 Checking vocabulary by means of reading comprehension
Fill in the gaps.
1. Pipe and fittings are made of different material ___________.
2. Pipe joints allow __________________________.
3. Joints can be ________ or _______________.
4. Flanges can be _________, __________ and _________.
5. Joints that can be taken apart include _____________.
Part 2 Detail reading: questions that ask for specific information
Answer the following questions.
1. Which are the most popular and least expensive methods of joining steel pipes?
2. When is threading used? Why?
3. When welded joints are used? What is the advantage of this method?
4. What is the most common joint in the welded method?
5. What is the difference between soldering and brazing?
6. Why can compression couplings be used with all types of pipe?
7. Why is the use of mechanical joints in piping systems becoming popular?
8. What method is used for fibreglass pipes, vinyl pipes and polyolefin pipes?
Part 3 Main idea: checks the student’s comprehension of the text
Fill in the following table.
| Method | Pipe type | Pipe size | Function | Description |
Part 4 Interpretive questions – analyze and infer the text
Discuss the following statement and prove your opinion.
Piping connections serve an important role in the operation of the system. Depending on the application, pipe connections can take a variety of forms.
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