Put the following sentences in the right order according to the text.

§  Water-hammer pressures can be greatly reduced by use of slow-closing valves, automatic relief valves, air chambers and surge tanks.

§  Flow in a sag pipe is under pressure and follows the principles of flow in pressure conduits.

§  Surge tanks are installed on large pipelines to relieve excess pressure caused by water hammer.

§  A pressure conduit is a conduit which is flowing full.

§  Gate valves, check valves, drain or blow off valves, pressure-relief valves are required for the proper functioning of a pipeline.

§  The internal pressure within a conduit is caused by static pressure and water hammer.

§  Pressure conduits are preferable for public water supplies because of the reduced opportunity for pollution.

§  Surge tanks are often built partially or wholly underground.

Make the plan of the text “Pressure Conduits” and write down its summary.