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IPHE Course

The document discusses potential causes of foul smells from plumbing systems, including dry P-traps, cracks in drain pipes, improperly sealed manhole covers, and lack of ventilation. It emphasizes the importance of properly installing and maintaining traps, seals, and vents to prevent the buildup of gases and leakage of foul odors. Re-sealing traps, adding vents to sump pits and grease interceptors, and ensuring plumbing verticals are sealed can help reduce foul smells.

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259 views30 pages

IPHE Course

The document discusses potential causes of foul smells from plumbing systems, including dry P-traps, cracks in drain pipes, improperly sealed manhole covers, and lack of ventilation. It emphasizes the importance of properly installing and maintaining traps, seals, and vents to prevent the buildup of gases and leakage of foul odors. Re-sealing traps, adding vents to sump pits and grease interceptors, and ensuring plumbing verticals are sealed can help reduce foul smells.

Uploaded by

api-3757030
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Foul Smell

Foul Smell

Speaker : William KH Cheung


June, 2006
PPT-25

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung

Foul Smell

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung
Recommendation Foul Smell
Refill trap every month Note: Water Seal will
with a cup of water dry up in 45 days

P-Trap

Bottle Trap
CIPHE Plumbing Course 8 May, 2008
Speaker : William K.H>.Cheung

Foul Smell

Foul smell will


come out from
waste outlet and
overflow

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung
Foul Smell

Smell from air valve of anti-syphonic trap

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung

Foul Smell
Possible Smell Leakage

CIPHE Plumbing Course 8 May, 2008


Anti-syphonic traps
Speaker : William K.H>.Cheung
Foul Smell

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung

Foul Smell

Smell from the Traps

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung
Foul Smell
Possible Smell Leakage

Positive
pressure

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung

Foul Smell

Re-sealing trap has less chance of smell leak

Re-sealing Trap

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung
Foul Smell

Negative
Pressure

Function of a
Re-sealing Trap

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung

Foul Smell

Positive
Pressure

Re-sealing Trap

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung
Foul Smell

Brass P –type
Re-sealing Trap

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung

Foul Smell

Pop-Up Floor Drain


at Open Position

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung
Foul Smell

Self-closing Floor Drain can prevent


foul smell back pressure

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung

Foul Smell

Self-closing Floor Drain


CIPHE Plumbing Course 8 May, 2008
Speaker : William K.H>.Cheung
Foul Smell

Singapore Practice

Hong Kong Practice

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung

Foul Smell

Air leakage at foul water manhole cover

Add photo to show closed cover

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung
Foul Smell
Foul Water Manhole Cover and Frame
Should Be Sealed With Grease

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung

Foul Smell

Air leakage at storm water manhole

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung
Foul Smell

Sewage Manhole Storm Water Manhole

Illegal connection of sewage water


discharge to storm water drain will
contaminate the whole storm water drain
and result in spread of foul smell

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung

Foul Smell

Air leakage at pipe sleeve

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung
Foul Smell

Pipe and sleeve not


Installed vertically

Gap to be
sealed up

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung

Foul Smell

Foul smell in kitchen

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung
Foul Smell

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung

Foul Smell
Foul Smell in Kitchen

Add a vent pipe to release the pressure

Positive pressure inside


Sump pit

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung
Foul Smell

Ventpipe
Vent pipe size shall be
shall be large
largeenough to release pressure
enough
to release pressure

Positive pressure inside

Add a vent pipe to release the pressure

Pump-On
CIPHE Plumbing Course 8 May, 2008
Speaker : William K.H>.Cheung

Foul Smell

Inside part of Kitchen Grease Interceptor


CIPHE Plumbing Course 8 May, 2008
Speaker : William K.H>.Cheung
Foul Smell

To prevent smell spread from Interceptor :-

1. Proper traps to be installed


2. Sufficient size of vent pipe
3. Ventilation be provided at :
• Interceptor
• Sump Pit
• Vent pipe connect up to roof

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung

Foul Smell

Grease Decomposing Chemical

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung
Foul Smell
Foul Smell

7. Smell from Garbage Room

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung

Note : Foul Smell


1. Adequate ventilation
should be provided
2. Regular cleaning of walls
and floor

Inser barbage room

W.Cheung
CIPHE Plumbing Course 8 May, 2008
Speaker : William K.H>.Cheung
Foul Smell

Note:
Apply Microorganisms on
wall or floor can remove
smell effectively

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung

Foul Smell
Foul Smell

8. Smell from leaking pipe joints

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung
Foul Smell

Leaking Cast Iron Pipe


and Joints

Recommendation :

Replace the pipe

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung

Foul Smell

Leaking UPVC Pipe

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung
Foul Smell

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung

Foul Smell

Provide Expansion Joint at every floor

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung
Foul Smell
Foul Smell

9. In-effective flush of water closet

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung

Foul Smell

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung
Foul Smell

Designed water level

Note :
Ensure adequate volume of water for a complete flush
CIPHE Plumbing Course 8 May, 2008
W.Cheung
Speaker : William K.H>.Cheung

Foul Smell

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung
Foul Smell

Modern Design flushing apparatus is generally


Only suitable for clean water application

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung

Foul Smell

When using “Water-save” cistern and


flushing apparatus, make sure it is
compatible with the WC bowl design

The storage volume may be


too small for the flush

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung
Foul Smell

10. Back pressure from water closet

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung

Foul Smell

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung
Foul Smell
Foul Smell

11. Smell due to floor drain back pressure

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung

Foul Smell

Missing Trap

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung
Foul Smell

Soil Waste Stack Vent Stack


The Vent Stack may connect to a soil fitment

Sealed Trap Gully

Foul Air Back Pressure

Connect to Manhole

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung

Foul Smell

Soil Waste Stack Vent Stack

Sealed Trap Gully

Connect to Manhole

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung
Foul Smell

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung

Foul Smell

Double trap installation :-


Will slow down the flow velocity
Air lock, no flow
Should provide an air break, or
Provide a vent between the two traps
CIPHE Plumbing Course 8 May, 2008
Speaker : William K.H>.Cheung
Flush from
Foul Smell

Toilet
To Vertical Soil Stack

h Pipe
aste Branc
it chen W
From K

CIPHE Plumbing Course 8 May, 2008


Side View
Speaker : William K.H>.Cheung

Foul Smell

Foul smell forced to kitchen waste pipe

Flush from toilet

Rusty Soil Leaking


CIPHE Plumbing Course 8 May, 2008
Speaker : William K.H>.Cheung
Foul Smell
Soil Escaped from
Resealing Anti-
siphon Trap Leaking from Toilet Soil Branch Pipe
to Lightwell and into Kitchen

Contaminated Lower
Floor's Stainless
Steel Furnace Cover
in Lightwell

Foul Air and Fluid from Toilet


Soil Escaped through Trap
into Kitchen and Living Areas

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung

Foul Air and fluid from Foul Smell


toilet soil pipe push
back through Trap into
Kitchen Living Areas and
even spread to Common
Lift Lobby and Shaft

Leaking from Toilet Soil Branch Pipe to Light well and into Kitchen
CIPHE Plumbing Course 8 May, 2008
Speaker : William K.H>.Cheung
Foul Smell
Primary Air
Handling Unit

Pipe duct floor drain blocked


up by aggregate
Foul smell being
sucked into the
Primary Air Unit
CIPHE Plumbing Course 8 May, 2008
Speaker : William K.H>.Cheung
57

Foul Smell

Pipe duct being misused as


store room.

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung
58
Foul Smell

End of PPT, Thank You !!

CIPHE Plumbing Course 8 May, 2008


Speaker : William K.H>.Cheung

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