Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
38 Cards in this Set
- Front
- Back
|
What is a bigger problem carpender ants or termites
|
Termites
|
|
|
How did termites get to Ontario?
|
Imported
|
|
|
What is the difference b/w carpender ants and termites?
|
Carpender ants chew wood to create a place to live and termites chew wood for food.
|
|
|
Why are termites hard to detect?
|
They eat the inside of the wood and leave the surface?
|
|
|
How do you detect termites?
|
probe with a sharp object.
-replace wood and chemically treat |
|
|
What are the indicators that a basement is dry?
|
Lots of storage stuff
|
|
|
What do you look for to determin if floor coverings are ok
|
adhesive comming through floor
|
|
|
What does eflorences used for?
|
see on walls, brick and poured concrete.
-moisture penetrates and picks up salts and carries it if there is a lot then see eflorences if not alot then stays on walls. Tells you that moisture barrier no longer working. |
|
|
Give 3 problems that can be found in basements
|
-improper sloping
- foundation drainage system might not be working. - might not have drainage system prior to 1940's - storm water drainage system could back up. |
|
|
- cutting holes in basement walls below grade creates problems how do you solve this?
|
put a well and there needs to be drainage hole.
|
|
|
How high do crawl spaces go to?
|
around 2"
|
|
|
Are crawspaces practical?
|
No
usually not finished - soil floors plumbing visible - heating visible |
|
|
What 2 purposes does plumbing serve?
|
-removal of waste
-supply of potable water |
|
|
What is potable water considerations?
|
-sufficient supply of water to each fixture
-no opportunity for the back flow of contaminated water. |
|
|
What is considered when designing waste?
|
1. Quick removal with min chance for stoppare of drains or leakage.
2. Prevent entrance of vermin and sewer gas from plumbing system or sewage. |
|
|
If the house is designed properly what are the only ways that vermin can enter?
|
toilet
floor drains. |
|
|
What is the composition to sewer gas?
|
No definite composition.
|
|
|
What is causes backflow?
|
cross connection (arrangement b/w 2 piping systems).
|
|
|
What is the favourable pressure?
|
To the potable side
|
|
|
Are crossconnections legal?
|
yes
|
|
|
What is the intended source of a potable supply?
|
Municipal treatment plant
|
|
|
Give 6 systems that backflows can happen?
|
1. boiler system
2. steam systems 3. aspirators 4. autoclaves 5. chlorinators 6. swimming pools |
|
|
How can you prevent cross connection back flow?
|
air gap
|
|
|
What is the definition of an air gap?
|
distance b/w the fauscet openning and overflow rim.
|
|
|
What is the min distance for air gap?
|
1"
|
|
|
How can an air gap be measured?
|
by 3X diameter of pipe, so 1/2 inch pipe - airgap of 1 and 1/2"
|
|
|
Ideally where do you put an air gap?
|
As close the source as possible
|
|
|
In a surge tank what is the color of the potable side? What is the colour of the non potable side?
|
Green, yellow
|
|
|
Vacuum breaker?
|
breaks syphanage by letting air to enter the piping system.
|
|
|
Where should put the vacuum breaker?
|
As close to the source of contamination as possible.
|
|
|
What is a common vacuum breaker?
|
Non pressure
|
|
|
Vacuum breaker is place where?
|
5 cm above flood rim or more
|
|
|
Where is non pressure type VB's placed?
|
downstream from the valve so that water passes throught the valve to the vaccume breaker
|
|
|
What is most common non pressure or vacuum breakers?
|
non
|
|
|
How can you tell if it is a non pressure type vacuum breaker?
|
if vacuum is placed b/w valve and source of contamination
|
|
|
Where are non pressure vacuum breakers found?
|
Industrial and not homes
|
|
|
Where are pressure type vacuum breakers found?
|
upstream of valve. Requires constant water pressure
|
|
|
What is the min distance to contamination?
|
Can't be closer than 30cm
|
