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WorksheetsCold water 1
Total questions: 40
Worksheet time: 13mins
According to BS6700 and the Water Regulations, a drain off valve should be installed
At every draw off point
At every high point in the system
At every low point in the system
Above the cold water storage cistern
Pin holing in copper pipework is commonly caused by
Hard water
Acidic water
Alkaline water
Pure water
What is the correct way to leave open ended pipework?
Place a warning label on every open end
Cap off with a push fitting
Warn the customer not to interfere with any pipework
Be as quick as you can to return
One of the major problems when leaving a dead leg in a cold water pipe is
Electrolytic corrosion
Pitting of pipework
Reduction in water flow
Possible bacterial growth
The use of WRAS approved fittings when installing cold water pipework is
A legal requirment
To be corrosion resistant
To avoid contamination
All of the above
What would be done after sound testing of a new completed cold water system
Visual inspection with the customer
Flush the pipework out then hand over to the customer
Prepare the benchmark certificate
Hand over to the customer
What is the most cost effective way to repair a stop valve that has the head gear jammed open
Replace the head gear only
Replace the whole valve
Leave in position, and install a new stop valve upstream
Repack the glands around the spindle
When decommissioning a system, the correct procedure is to
Turn off the water quickly to save any wasted water
Drain the system down then inform the customer
Inform the customer and other trades first then drain the system
Use a pump to drain down quickly
What is this item?
Fullway gate valve
Drain off valve
Stop Valve
Spherical Ball valve
What type of valve is shown in the diagram?
Spherical Ball Valve
Fullway Gate valve
Stop valve
Spherical Ball Valve
Between what depths should a service pipe be buried?
135mm to 1,750mm
350mm to 750mm
1,350 mm to 1,750mm
750mm to 1,350mm
Which of the following materials is not allowed to be installed on new cold water systems?
Copper
Stainless steel
MDPE
Lead
Which valve is designed to shut off the supply of water in a cistern at a predetermined level
Stop Valve
Fullway Gate valve
Float Operated Valve
Isolation Valve
If a hand basin has submerged taps, Which backflow device must be installed
Overflow
Single Check valve
Double Check valve
Auk 3 air gap
Fluid category 1 represents
A serious health risk
A significant health risk
A Slight health risk
No health risk
Which of the following water pipes connects the local main to the water undertakers stop valve
The distribution pipe
The communication Pipe
The feed pipe
The service pipe
A cold water storage cistern base must be supported
Over the whole of its base
Over at least three bearers
By using chipboard
Over the majority of its base
Which backflow prevention device must be installed on a supply to a hose union bib tap?
Auk 2 air gap
Single check valve
Fullway gate valve
Double check valve
The plastic medium density supply pipe, which is blue, is manufactured from which material?
Polyethelene
Polystyrene
Polypropylene
Polybutylene
mixer tap which allows hot/cold water to mix in body of tap with unbalanced pressure must have
Double check valve on both hot and cold supplies
Single check valve of both hot and cold supplies
AUK 2 air gap
AUK 3 air gap
Which one of the following connections to a CWSC must be screened?
Cold supply pipe
Cold feed pipe
Warning Pipe
Cold distribution Pipe
According to the water regulations, where must a drain off valve be placed?
At every high point in the system?
At every low point in the system?
At every high pressure point in the system?
At every low pressure point in the system?
Why do we need to use WRAS approved fittings?
They are legal and avoid contamination?
They are cheap and can be easily fitted?
They come with a longer warrantee than other fittings?
Their quality is not as good , but will work.
When turning a stop valve off on incoming mains, you find it's jammed. Whats most productive?
Spraying with oil and trying again in a couple days?
Turn off at the water undertakers valve and replace valve?
Cut the section of pipework out with the valve attatched?
Replace the head gear of the valve only?
Which of the following can affect pressure and flow rates to the incoming main to a property?
Peak demand periods?
The size of the cwsc in the loft?
The square metre floor area of the property?
How close the water meter is to the property?
The fluid category that offers a slight health risk is:
1
3
2
4
The correct back flow protection device that would be installed prior to a shower mixer valve
Single check valve
Double Check Valve
RPZ Valve
Type AG air gap
To protect cat 1 water from cat 3 water , what would need to be installed
Single check valve
Double check valve
RPZ valve
Type AG air gap
What would this item be used to test?
Pressure
Category of water
Flow rate
PH Value
If a customers tap is dripping, what tool can be used to correct the situation?
Club hammer
Stillsons
Spanner
Re-seating tool
What is the minimum size a CWSC for an indirect system
150 litres
50 litres
200 litres
100 litres
What type of cold water storage cistern should be used to supply water for domestic purposes?
230 litre by law 30 kit storage cistern
300 litre by law 30 skit storage cistern
200 by law 30 skit storage cistern
180 by law 30 kit storage cistern
Where should the cold water distributing pipe be connected to the cistern?
In the air gap 40mm up
Below the cold water storage cistern 50mm down
In the attic 50 mm up
In the side 25mm up
The overflow to a protected cold water storage cistern should include what type of protection?
Galvanised steel to prevent pitting
Screened mesh to block out insects
Styrene insulation to stop temperature differentials
Plastic piping to stop atmospheric corrosion
The holes to a cold water storage cistern are made using what type of saw?
Hole saw
Hack saw
Reciprocating saw
Circular saw
If a part of an installation becomes redundant, the pipe work should be
Insulated
Earthed
Disconnected
Clipped
On a AUK 2 bath tap 3/4 what size is the gap distance
20mm
25mm
40mm
50mm
What is the minimum distance from the finished water level in the cistern to bottom of the overflow
25mm
50mm
75mm
100mm
What type of cold water system is used on high incoming water pressure
Boosted
Direct
Indirect
Inter Boosted
When installing a new indirect cold water system, which of the following should happen?
One tap (Kitchen sink) drawn from supply pipe
One tap(kitchen sink)should have distribution pipe from cistern
Mixer taps will require double check valves
Mixer taps should never be installed due to pressure differ
