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XI. Translate the following conditional sentences.

I

1. If there are leaks in the line, they cause an appreciable drop in pressure.

2. If the density of the flowing gas changes, its velocity will also change.

3. If any four of the five conditions are known, the fifth can be determined by using a suitable pipe line flow formula for determining the else of the new line.

II

1. If a four-inch line were used the wall thickness would be above 1/4 - inch.

2. Without pressure, oil would not move in a pipe line and it would be impossible to deliver it to the consuming area.

3. If damage occurred at some place on the pipe line, the workers at the nearest pumping station would notice it by means of a device showing a leak on the line.

III

1. If we not developed our industry in the Urals our country would not have been supplied with steel during the war.

2. If you had applied your theoretical knowledge to your practical work you would have got a different result.

XII. Translate the following sentences into Russian paying attention to conditional sentences.

1. The workers would not have done this work provided they hadn't been supplied with all the necessary equipment.

2. This material cannot be used unless it is subjected to special treatment.

3. But for the new technique, wе should not have achieved such great successes.

4. Were not for this advice, they would be in a difficult position.

5. Had the equipment been repaired, we should have begun the work long ago.

6. Had they asked this question, they would not have been able to answer it.

7. Were she asked to translate this article, she would do it without any difficulty.

XIII. Translate the following extract into Russian with the help of a dictionary.

When a pipeline is built, the construction project not only covers the civil work to lay the pipeline and build the pump stations, it also has to cover all the work related to the installation of the field devices that will support remote operation.

Field devices are instrumentation, data gathering units and communication systems. The field instrumentation includes flow, pressure and temperature gauges/transmitters, and other devices to measure the relevant data required. These instruments are installed along the pipeline on some specific locations, such as pump stations (oil pipelines) or compressor stations (gas pipelines).

The information measured by these field instruments is then gathered in local Remote Terminal Units (RTU) that transfer the field data to a central location in real time using communication systems, such as satellite channels, microwave links, or cellular phone connections.

UNIT 6