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WorksheetsPP10 sanitation Plumbing Traps
Total questions: 50
Worksheet time: 25mins
What is the purpose of a trap under an appliance in plumbing?
To regulate the water flow
To stop the noxious smell from the soil stack entering the property
To measure water usage
To filter out debris
Where is the trap attached in a plumbing system?
To the top of the waste fitting on the appliance
To the underside of the waste fitting on the appliance
Outside the property
At the main water supply
What are the majority of traps made from?
PVC
Polypropylene
Iron
Rubber
Which of the following materials is NOT mentioned as a common material for traps?
Brass
Copper
Chrome plated
Steel
What is a common jointing method used in traps?
Soldering
Welding
Compression using a rubber seal
Gluing
What is the purpose of the trap seal depth in plumbing?
To measure the amount of water used in a property
To retain water to prevent noxious smells from entering the property
To control the flow of water through the pipes
To indicate the level of water contamination
What is the waste fitting size for a bidet
32mm
40mm
NA
100mm
What is the trap diameter required for a shower installation?
32mm
40mm
75mm
100mm
what is the seal depth for soil stack for a washing machine?
32mm
40mm
75mm
50mm
What is the seal depth for soil stack for a WC pan?
32mm
40mm
75mm
50mm
Which appliance requires a waste fitting size of 40mm
Wash basin
Bidet
Bowl urinal
Washing machine
What is the minimum trap seal depth required for a gully?
25mm
38mm
50mm
75mm
Why can baths and showers have a shallower seal depth compared to other appliances?
They are smaller and tapered
They discharge water more quickly
They are larger and flat bottomed
They use less water
Which appliances can discharge into a gully trap or a hopper head?
Toilets and bidets
Sinks, showers, basins, and baths
Washing machines and dishwashers
Rainwater gutters and downspouts
When is a 'P' trap commonly installed?
When the discharge branch is vertical to the appliance
When multiple appliances are served by one discharge branch
When the discharge branch is horizontal to the appliance
When the initial waste pipe is vertical
Under what circumstance is an 'S' trap commonly installed?
When the discharge branch is horizontal to the appliance
When the initial waste pipe that leads to the discharge branch is vertical
When the appliance is located outdoors
When there is only one appliance connected to the discharge branch
What is the purpose of a running trap in plumbing?
To allow multiple traps to be installed in the discharge branch
To save space and money by only requiring one trap
To increase the distance between the appliance and the trap
To make the installation process more complex
Which type of trap is designed for use under a wash-hand basin and allows the waste to be hidden behind the pedestal?
Bottle trap
P-trap
S-trap
Slimline, pedestal or straight through trap
What is the trap shown on the left side of the image called?
P-trap
Bottle trap
Slimline 'S' trap
Running trap
What is the use of a washing machine trap?
To regulate the water temperature in a washing machine or dishwasher
To prevent sewer gases from entering the building
To filter out debris from the washing machine water
To be used for a washing machine or dishwasher with a pumped discharge
What type of trap is a washing machine trap?
S trap
Q trap
P trap
U trap
What is the height of an extended 'P' trap for a washing machine?
400mm
500mm
600mm
700mm
Where is the discharge hose of a washing machine trap located?
Below the trap
Inside the trap
Over the top of the trap within a supporting clip
Detached from the trap
What is the allowed depth of seal for bath traps designed for the restricted area under a fitted bath?
38mm
50mm
40mm
45mm
If a bath is discharging to a hopper or gully trap, what is the allowed trap seal depth?
50mm
38mm
45mm
40mm
Why are bottle traps not suitable as a sink trap?
They are too large for a sink.
They are not visually appealing.
They are restrictive to the flow of water.
They are too expensive.
On what principle does a shower trap operate?
A similar principle to the U-bend trap
A similar principle to the bottle trap
A similar principle to the S-trap
A unique principle not related to other traps
What is the depth of seal for a shower trap mentioned in the document?
25mm
50mm
75mm
100mm
Does the shower trap include a feature for cleaning?
No, it is sealed permanently
Yes, it includes a non-removable waste grill
Yes, it includes access for cleaning via a removable waste grill
No, it is self-cleaning and requires no maintenance
What is the purpose of anti-vac or resealing valves in plumbing systems?
To increase water pressure in the pipes
To prevent trap seal loss due to siphonage
To reduce water consumption
To filter impurities from the water
When can a standard trap be used without the problem of trap seal loss?
When the system is old and needs upgrading
When the system has been designed and installed incorrectly
When the system has been designed and installed correctly
When additional appliances are added to the system
Why are anti-vac traps not recommended for new installations?
They are too expensive
They may not hold during an air test
They cause blockages in the waste pipe
They increase the risk of water leaks
What function does the small air admittance valve in anti-vac traps serve?
It regulates the flow of water through the trap
It cleans the waste pipe
It allows a small amount of air into the waste pipe under negative pressure
It seals the trap completely
What is a self-sealing waterless valve used for in plumbing?
To regulate the water pressure
To create an air tight seal to stop noxious smell entering the property
To measure the amount of water used
To filter impurities from water
Why is a self-sealing waterless valve not considered a trap?
Because it uses a seal of water
Because it filters impurities from water
Because it does not use a seal of water
Because it regulates the water pressure
How does a self-sealing waterless valve function after the discharge has finished?
The membrane remains open
The membrane closes
The valve seals with water
The valve releases water
What is the maximum diameter for waste pipes that may discharge directly into the back-inlet gully of a below-ground drainage system?
30mm
40mm
50mm
60mm
Where must the waste pipe discharge in relation to the grating and water line in the gully?
Above the grating and below the water line
Below the grating and above the water line
Below both the grating and the water line
Above both the grating and the water line
What is the purpose of ensuring that the waste pipe discharges below the grating but above the water line in the gully?
To prevent water from flowing back into the building
To ensure that an air break is maintained and no smells can enter the building
To increase the water pressure in the drainage system
To allow for easier cleaning of the waste pipe
What is the minimum distance from the permitted opposing connection in the soil stack to the branch connection?
200mm
250mm
300mm
2.5 times the diameter of the pipe
What range of drainage system sizes can WC pan connectors accommodate?
50mm to 75mm
75mm to 110mm
100mm to 150mm
110mm to 160mm
Where is the access manhole located in relation to the WC connector?
Inside the WC
Above the finished floor level
externally but close to the building
Below the underground foul water drain
What is one of the reasons for trap seal loss in plumbing?
Temperature increase
Evaporation
Water pressure
Pipe diameter
Which of the following is not a reason for trap seal loss?
Momentum
Compression
Self-siphonage
Water filtration
What can cause the water level in a trap to be lowered, leading to trap seal loss?
Induced siphonage
Water addition
Sealant application
Pipe expansion
In which climates is evaporation of the trap seal water commonly experienced?
Cooler climates
Warmer climates
Humid climates
Dry climates
Why is regular use important for the maintenance of the trap seal?
It prevents the accumulation of debris
It ensures the trap remains clean
It helps in topping up the seal water
It reduces the water bill
What causes the water levels in the appliance traps to bob up and down, leading to trap seal loss?
Changes in water temperature
Wind passing over the top of a soil stack
Clogs in the plumbing system
Faulty plumbing fixtures
What can assist with the problem of trap seal loss due to wind?
Tightening the pipes
Installing a wind cowl
Using heavier water
Decreasing the size of the soil stack
what is the common name for wind turbulence affecting trap seal loss
wandering about
stalling
wavering out
induced
