Above Ground Drainage Flashcards
Who was the first too use sanitation systems??
The London county council
Why was sanitation systems invented?
They were invented too prevent people getting diseases from water
What is the purpose of a well designed discharge pipe system?
To permit the speedy removal of waste too the underground drainage system
Explain the term discharge stack?
The vertical part of the stack which carries waste water
Explain ventilation stack?
The part of the stack which does NOT carry waste water
Explain branch discharge stack?
A pipe carrying waste water from a fitting to the main discharge pipe
Explain the 2 pipe system of above ground drainage?
It consists of four pipes and each stack runs separately too the drain
Explain the 1 pipe system of above ground drainage?
It has 2 pipes and is connected directly too the drain
What is the purpose of the trap ventilation pipe?
To ensure a good circulation of air in the system
Why was the single stack system designed?
It was designed for the desire for economy and efficiency and large buildings like hotels and office blocks
Explain the single stack system?
It is a stack that has too be installed using rules and used for large buildings
Los 3 rules associated with the single stack system?
Connect each appliance seperate
Limit the flows
Use correct pipe size
What dept of seal would a wash basin trap hae?
75 mm deep
What dept of seal would a standard toilet have?
50 mm deep
What length can u run a 40 mm water pipe before upgrading to the next size?
3 metres
List 5 ways a trap can lose it’s seal?
Leakage Self siphonage Evapouration Compression Momentum
How does wavering out accur?
This is caused by gusts of wind passing over the top of the vent pipe
How does self siphonage occur?
Find out tomorrow
How does induced siphonage occur?
This occurs when two or more waste pipes are connected together
How does momentum occur?
This is caused by the sudden discharge of water into the trap
How does capillary attraction occur?
This occurs when a piece of absorbent material or a hair is caught in the outlet of the trap with one end dipping in the water and one end hanging over the outlet
What is the purpose of a reseating or anti siphon trap?
To maintain their water seal
What is the purpose of a grease tap?
Too keep grease out of the sewer
We’re would you find a grease trap??
In kitchens restaurants and hotels ect
What is the purpose of gutters and down pipes?
To remove the rainwater from the rooftop
Where would you find a valley or box gutter?
Where two pitched roofs adjoin each other
