Unit 305 Flashcards
(19 cards)
How many UK fluid categories are there?
5
Options: 4, 5, 6, 2
Water within a food preparation area such as a kitchen sink falls within which UK fluid category?
5
Options: 4, 5, 6
Waste water collected from baths, showers and washing machines that is then reused for WC flushing is known as:
d Grey water
Options: a Rainwater harvesting, b Wholesome water, c Black water, d Grey water
With regard to water treatment, what does the passage below describe? designed to slow down the water velocity to allow the solids that the water contains to sink to the bottom and settle under gravity. It may also be used to reduce turbidity?
a Sedimentation
Options: a Sedimentation, b Filtration, c Sterilisation, d Chlorination
What is the minimum supply pipe size to a modern dwelling?
b 25 mm
Options: a 20 mm, b 25 mm, c 32 mm, d 40 mm
Who is responsible for the collection, treatment and distribution of water to the consumer ?
The Undertaker
What is the maximum recommend distance at which a plastic pipe should be left exposed when entering a dwelling.
150mm
If copper is used to supply a property, what grade should be used ?
Soft BS EN 150
What’s the minimum size of incoming pipe to the property ?
25mm
How much can rainwater harvesting save a customer ?
50%
What category of water is greywater reuse ?
Cat 5
How long can greywater reuse be stored for ?
Only a few hours
How much of the world’s total amount of water is fresh water ?
3%
Which source of water is found underground ?
Borehole
What depth must the cold water main be laid ?
750-1350 mm
What category is a slight health risk ?
Cat 3
What category is a significant health risk ?
Cat 4
What category is a severe health risk ?
Cat 5
What is the primary reason the incoming main is buried so deep in the ground ?
To prevent frost damage
