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29 Cards in this Set
- Front
- Back
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Rainwater leader sizing is based on a rainfall volume in ______ over a period of _________ |
Millimetres 15 mins |
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The minimum size of a circular rainwater leader is _____ |
2” |
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For conversion of fixture unit loads to litres for sizing purposes , 269 fixture units or less is equal to _________ litres |
2360 |
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When the number of fixture units exceeds 260, the load is ______litres for each fixture unit |
9.1 litres |
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A pump rated at 10 imperial gallons per minute would add a load to the drainage system of _____________ litres |
681 |
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Basic function of a floor drain |
Rapidly removed liquid waste from areas surrounding the drain |
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List 5 factors for selecting a floor drain |
1)max volume of liquid 2)Type of traffic to be expected 3)Types if waste 4)optional accessories 5)Grate appearance |
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What is the maximum length of a 3” floor drain? |
12’ |
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What is the minimum size outlet on a floor drain? |
2” |
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What is the min length of a trap arm for a 3” floor drain? |
18” or 450mm |
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What is the maximum length of a 4” floor drain trap arm at 1/8” per foot? |
32’ |
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Can a floor drain be hooked up to a storm drainage system? |
Yes |
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How can a trap seal be maintained in the floor drain? |
Trap primer, indirect connection to a drinking fountain, or manually filling |
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What is the correct term for a rainwater pipe located inside a building ? |
Rainwater leader |
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Briefly explain why rainwater treatment should not be piped to a sewage treatment plant. |
Doesn’t require treatment, undo stress in treatment plant |
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What would happen if rainwater conductor was connected to a septic tank? |
Flood the tank rendering it inoperable |
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Why is a trap necessary between rainwater pipe and sanitary drain? |
Keep sewer gases from entering rainwater pipe and exiting at roof level. |
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State 2 reasons why fixtures should not be connected to rainwater leaders: |
-sewage discharged through rainwater into storm is not treated. -Water is liable to enter through fixtures , flooding the space |
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Where a rainwater leader connects to a roof hopper, the piping immediately under the hopper should be _______ or provided with an ____________ to prevent __________________. |
Offset Expansion joint Rupture if the piping joint due to the expansion and contraction caused by temperature changes. |
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A soil or waste pipe that serves more than one clothes washer and in which pressure zones are created shall not serve for ________________________. |
Connecting other soil and waste pipes . |
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For the purposes of expansion, what is the maximum distance a from the roof may a leader fall before it turns 90• for a horizontal offset. |
Must not exceed 5 feet. |
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What is the minimum length of a horizontal offset of a rainwater leader? |
5 feet |
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If you are installing an expansion joint on a rainwater leader, where must it be located ? |
Within 5 feet of the roof. |
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How do you convert FU’s to Litres? |
# FU X 9.1= L |
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What is the formula if there is less than 260 FU? |
No formula. The pipe is sized using a set number of 2360 litres. |
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Local rainfall intensity in Edmonton per 15 mins? |
22mm |
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Formula for sizing rainwater leaders : ( based on roof measurements ) |
Length x Width x 22mm rainfall intensity = #Litres |
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Minimum size for a circular rainwater leader is: |
2” |
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Now do the code cards |
Right now |
