Cold Water Flashcards
(31 cards)
Which British standard is the specification for installations inside? Buildings conveying water for human consumption?
806
Which British standard is the guide to the design, insulation, testing and maintenance of services supplying water for domestic use within buildings?
8556
Which organisation produces water regulations, and water fittings and material directory?
Water regulation advisory scheme (WRAS)
What chemical is in permanent hard water?
Calcium sulphate
Which chemical is in temporary hard water?
Carbonate
What problem occurs when temporary hard water is heated above 65°?
Limescale
Easiest way to determine if you have hard or soft water?
Soap lather test
What type of pipework carries mains water?
MDPE pipe
What is the minimum and maximum depth for a service pipe?
750mm - 1350 mm
Name of the pipe from the mains to the boundary stop valve?
Communication pipe
Name the pipe from the boundary stop valve to the domestic property?
The service pipe
Distance pipe must be from external wall entering property if uninsulated?
750mm
What type of copper can we use underground?
R220 soft copper
First two fittings that should be installed on the service pipe entering the property?
Stop cock and drain off valve
State where internal stop valve should be installed?
Inside the property as close as possible to the entry of the house
State two places where you could isolate the water to the service or supply pipe?
Internal and external stop tap
Identify the BS number for the stop valve?
BS1010
What type should a drain off valve be?
Screw down
What is the most cost-effective procedure to repair the stock valve when it jams?
Replace the headgear
Why should a drainer valve be installed other than above the stop valve?
Lowest point in the system
When is installing appliances on identify two key tests to be carried out?
Pressure test and flow test
Identify 4 factors that may impact water pressure measurements?
Location, local demand, time of day and size of income means
Give free advantages of a direct water system?
Cheaper to install, wholesome water from all outlets, good water pressure.
Give three advantages of an indirect system
Less wear and tear , constant water supply and no fluctuation at peak times
