Make up the plan according to the text

Unit 17

Tubing. Tube Connectors and Flexible Hose.

Memorize the following words and expressions.

Ø cubing-труби

Ø flexible hose- гнучкий шланг

Ø joined by means of - приєднаний завдяки

Ø the factors governing the selections - фактори, що визначають вибір

Ø because of - через

Ø whenever possible - де, тільки можливо

Ø the bursting pressure - тиск, що розриває

Ø assuming that - маючи на увазі

Ø stationary and moving parts - нерухомі і рухомі частини

Ø are made up of - зроблені з

Read and translate the text.

Tubing. Tube Connectors and Flexible Hose.

The various units of a hydraulic system are connected with some form of tubing or flexible hose.

Tubes are joined by means of tube connectors, usually of the same material.

Tubing. - Some of the factors governing the selection of tubing are corrosion, temperature, weight, mechanical strains, abuse and pressures. Because of its light weight, aluminum-alloy tubing and fittings are used wherever possible. Fittings are designed to withstand the bursting pressure that the tube of maximum wall thickness will withstand, assuming that the tube and fittings are of similar materials. For general high-pressure installations steel tubes and fittings are recommended. Flexible Hose. - Flexible Hose is used to connect hydraulic units between stationary and moving parts. Hoses are made up of varying layers of synthetic rubber, fabric and wire braid. In installing flexible hose care must be taken that the hose is free from twists. Under pressure a twist will rotate the hose and loosen the connection, causing failure.

3. Answer the questions :

1. Are the various units of a hydraulic system connected with flexible hose?

2. How are the tubes joined of tube connectors?

3. What are the factors of governing selection?

4. Where are the aluminum-alloy tubing used?

5. Fitting are designed to withstand the bursting pressure, are not they?

6. Is flexible hose used to connect hydraulic units?

7. What materials are hoses made up of?

4. Translate into English.

a) Гнучкий шланг

b) Зроблені з

c) Нерухомі і рухомі частини

d) Тиск, що розриває

e) Приєднані завдяки

f) Труби

5. Ask 4 types of the questions to the sentence:

The various units of a hydraulic system are connected with some form of tubing or flexible hose.

6. Fill in the gaps using the necessary words:

Connectors, corrosion, fitting, bursting, similar, to connect, rubber, free, twist

ü Tubes are joined by means of tube ..., usual ly of the same material.

ü Some of the factors governing the selection of tubing are... , temperature, weight, mechanical strains, abuse and pressures.

ü Aluminum-alloy tubing and ... are used wherever possible.

ü Fittings are designed to withstand the .... pressure.

ü The tube and fittings are of... materials.

ü Flexible Hose is used ... hydraulic units between stationary and moving parts.

ü Hoses are made up of varying layers of synthetic ..., fabric and wire braid.

ü In installing flexible hose care must be taken that the hose is ... from twists.

ü Under pressure a ... will rotate the hose and loosen the connection, causing failure.

7. FiIl in the table with + or -. What is connected to tubing and to flexible Hose?

	TUBING	FLEXIBLE HOSE
CORROSION
SYNTETIC RUBBER
TEMPERATURE
FABRIC
WEIGHT
WIRE BRAID
MECHANICAL STRAIN
ABUSE
PRESSURE

Unit 18

Pipe materials

1. Read and memorize following words and expressions:

Ø Copper pipes - мідні труби

Ø To fix - з’єднувати

Ø Cheap - дешевий

Ø Domestic - домашній

Ø To guard against - захищати від

Ø To isolate - ізолювати

Ø To allow - допускати

Ø Soil - земля

2. Read, translate and study the text:

Pipe Materials.

Copper pipes are permitted for use inside premises subject to the gauge complying with water company's regulations. Such pipes are simple to fix and have a neat appearance.

Galvanized wrought-iron pipes may or may not be permitted. Some authorities will only allow such pipes on the outlet side of a metered supply. Where the water is of a hard nature they may be safely used. Galvanized wrought-iron pipes, though cheap, are little used for domestic supplies.

There are three grades of iron pipes, known as "gas", "water" and "steam" strengths, and for water supplies the steam quality should be specified. Whatever type of service pipe is laid, it should be at a

reasonable depth below the surface of he ground, usually not less than 2 ft. 6 in., to guard against the effects of frost.

Mains are tapped under pressure by a special machine consisting of a watertight box which is attached the main by means of a chain. The hole is drilled and tapped.

This method allows the work of a connection to be made without shutting off the water in the main. They may allow the pipe through foul soil, provided the pipe is sufficiently protected from contact with soil.

3. Arrange the words in pair of synonyms:

· Fierce

· Reserved

· Insult

· Make

· Steady

· Firm

· Sincere

· Load

· Frank

· Mold

· Uncommunicative