COLD WATER DISTRIBUTION SYSTEM

As much as possible, water main should be laid above the elevation of concrete sanitary sewers, or crossover points, and at least 2 meters horizontally from such sanitary sewer when they are parallel. Should this be impossible for some reasons, the sewer main must be encased in concrete.

• True

• False

Lead pipe should be used for distribution of soft acid water or for water having high concentration of dissolved oxygen or chlorides.

• True

• False

Wells that are supplying water for public use should be located at a minimum distance of ____________ radius from residential areas

• 400 meters

• 300 meters

• 200 meters

• 100 meters

All residents within this zone limit are not required to have sanitary sewage facilities.

• True

• False

There should be no concrete sanitary sewers existing within the _________ radius of the well.

• 10 meters

• 15 meters

• 20 meters

• 25 meters

No outdoor privy, cesspools, septic tank or drain fields shall be located within _________ radius from the well.

• 30 meter

• 35 meter

• 40 meter

• 45 meter

Mainly found in hot water pipework systems. As the pipe gets hotter and expands, it causes creaking sounds which are often repeated as it cools and contracts. The use of relevant pipe clips, brackets or pads between pipes, fittings and pipework surfaces should help to deal with expansion and contraction.

• Flow Noise

• Water Hammer

• Expansion Noise

• Defective Pipe

This is probably the most common cause of complaint from customers. When a valve is closed suddenly, shock waves are transmitted along the pipework making a loud hammering noise. The problem is made worse where cold water supply pipework is not adequately clipped.

• Expansion Noise

• Defective Pipe

• Water Hammer

• Flow Noise

Pipework noise becomes significant at velocities over 3 m/s, so the system should be designed to operate below 3 m/s even if it means increasing the diameter of the pipe.

• Flow Noise

• Expansion Noise

• Defective Pipe

• Water Hammer

It happens when the water supply is connected to a device that creates pressure, such as a boiler, pressure washer, etc. The pressure created can be greater than the water supply, thereby creating backflow.

• Back-siphonage

• Back-water

• Back-pressure

• Back-flow