WorksheetsHot Water - PPT 6 - Backflow prevention
Total questions: 28
Worksheet time: 15mins
What is one of the responsibilities under the Water Regulations to prevent contamination of water within a property?
Increase water pressure
Stop backflow
Add more chlorine
Reduce water usage
Which method can be used to prevent back siphonage?
Installing a water filter
Using an air gap
Adding a water heater
Increasing pipe diameter
What is an example of using an air gap in plumbing?
Connecting two pipes directly
Using a valve to control flow
Separating the water level in a cistern and the discharge point
Installing a water pump
What is the purpose of an AUK 2 air gap?
To separate the spillover level of the appliance and the outlet point of the tap
To increase water pressure in the tap
To filter impurities from the water
To reduce noise from the tap
What is the minimum air gap required on a basin for an AUK 2 air gap?
20mm
15mm
25mm
30mm
Who normally pre-sets the AUK 2 air gap on a basin?
The appliance and tap manufacturer
The plumber
The homeowner
The building inspector
What is the purpose of an AUK 3 air gap on a kitchen sink?
To increase water pressure
To separate the spillover level of the appliance and the outlet point of the tap
To filter impurities from water
To reduce noise from the tap
What is the simplest form of mechanical backflow prevention when an air gap is not possible?
Check valve
Air gap
Double check valve
Pressure vacuum breaker
What type of water is at risk from cross contamination from category 2 water?
Saltwater
Wholesome water
Distilled water
Rainwater
In the example provided, what must be used to stop hot water from entering the cold water pipe?
Double check valve
Single check
Air gap
Pressure relief valve
What is the primary function of a single-check valve in a supply pipe?
To allow water to flow in both directions
To prevent backflow and allow water to flow in one direction only
To increase water pressure
To filter impurities from water
What distinguishes a verifiable single-check valve from a non-verifiable one?
A verifiable valve has a test point
A verifiable valve is larger in size
A verifiable valve is made of plastic
A verifiable valve is used only in industrial settings
Which of the following is a typical use of single-check valves in domestic installations?
Air conditioning systems
Shower valves
Electrical circuits
Gas pipelines
Which type of water does a double-check valve protect?
Category 1 water
Category 2 water
Category 3 water
Category 4 water
Which of the following is an example of where a double-check valve might be used?
In a swimming pool
In an instantaneous shower
In a water heater
In a refrigerator
What is required for a shower over a bath to prevent backflow if it is mains fed?
Double-check valve
Single-check valve
Restraining ring
Flexible connection
What must be maintained between the shower head and water level to prevent backflow?
Flexible connection
Double-check valve
Air gap
Mixing valve
What is the purpose of a flexible connection on pumps in a shower system?
To prevent backflow
To maintain air gap
To reduce noise and vibration
To retain the shower head
What is used to prevent flexible shower hoses from being submerged in bath water?
A rubber restrainer on a shower rail
A metal clamp
A plastic cover
A waterproof sealant
What type of air gap is on a basin, bath & bidet?
AUK1
AUK2
AUK3
AG
What air gap is found on a kitchen sink?
AUK1
AUK2
AUK3
AG
What is fluid category 4?
No Health Risk
Slight Health Risk
Significant Health Risk
Severe Health Risk
What is an example of a fluid in Category 2?
Mains water
Hot water in cylinder
Primary water
Urinal water
What is backflow in plumbing?
Water flowing in the intended direction
Water flowing in the opposite direction
Water being heated
Water being filtered
What causes back siphonage in plumbing systems?
Positive pressure
High temperature
Negative pressure (sucking)
Water filtration
What are the two types of backflow protection mentioned?
Chemical and biological
Mechanical and non-mechanical
Electrical and manual
Hydraulic and pneumatic
What is used to prevent flexible shower hoses from being submerged in bathwater?
A metal clamp
A rubber restrainer
A plastic cover
A wooden block
name the image
(a)
