Профессиональное развитие будущих инженеров-строителей средствами иностранного языка: Лексический практикум по английскому языку. Трубникова Н.В. - 80 стр.

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pressure. Plastics are used for bends and other pipe fittings. Diameters are in the

range 75-200 mm.

Cast iron drain runs are used for overground sections and where the

ground movement might otherwise cause fracture. Pipework beneath buildings

can either be cast iron encased in concrete or short lengths with flexible joints.

Rigid socket and spigot joints are caulked with tarred yarn and then filled with

hot lead or lead wool.

Plastics have increasingly replaced naturally occurring materials owing to

their low weight and high degree of prefabrication. Complete systems from the

sanitary appliance to the sewer, using one supplier and material, are common.

Such materials are derived from crude oil and their higher cost needs to be

compensated by reduced site time. Smooth bore drain systems can be assem-

bled with minimum skill and they are highly resistant to corrosion. Thermal ex-

pansion is greater, and telescopic joints are used. Short-term discharges from

some appliances (e.g. some types of washing machine) can be at temperatures

of 80 °C or higher. Polypropylene and acrylonitrile butadiene styrene (ABS)

pipes are suitable for the high-temperature applications.

Block B

Lexical exercises

I. Answer the questions:

State the meaning of the term «discharge unit». How many WCs can be con-

nected into a discharge stack of diameter 100 mm?

2. Under what circumstances may drains and sewers become damaged during

their construction and service periods?

3. What cases can pitch fibre pipes be used in?

4. What actions are taken at the construction of the water disposal system?

5. What is the sloping waste pipe’s diameter?