Hydrants Flashcards
What are the 2 sources of water?
- Static water, Open water (dams, rivers,)
- Reticulated water, closed water(anything in a pipe)
What are the 3 types of Reticulation systems?
- Trunk system (large pipes 600-3000mm in diameter
- Service mains ( 100-600mm residential and 150-600mm commercial)- has shut off valves allowing sections of the main to be isolated
- Ring mains (comes of service main to service a priority building like schools, hospitals).
Where is an AH (attack hydrant) found?
In a ring system
What can affect pressure?
1.Length of mains between reservoir/tank/pump
2.number of appliances connected
- Quantity of water being used by other consumers
- Number and size of hoses being used
What can effect flow?
Diameter of the main
Conditions of the internal pipe
Pressure at the main
Is operating
What are the different types of hydrants?
- Spring value hydrant
- High capacity hydrant
- Pillar hydrant
Describe the spring valve hydrant?
- Has a ball value
- Stan pipe connects to the bayonet lug
Describe a standpipe?
- Has a hand wheel
- Has 2 story’s couplings
- Has a head
- Has handles
- Has a barrel
- Has a lug at the end
How to find hydrants?
- Look for blue cats eyes
- Ask comcen
- Look at the job information on the MDT.
- Look for physical hydrants
What is water hammer?
When a value is closed to fast and the water hits the end causing it to bounce back.
Describe a booster cabinet?
Has a minimum of 2 65mm delivery’s
Some have water outlets for hydrant use.
Has a sign that says the maximum pressure to use and tested
What are the 2 main water supplies in canberra?
- The cotter river system- Corin dam is released into the cotter river
- Googong system
What are service reservoirs?
They provide localised storage to balance fluctuations in flows.
Explain how water is provided to Canberra?
Corin dam — bendora dam — cotter dam pumping station — stromlo water treatment —- city reservoirs
