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BSMM > Sanitary > Flashcards

Sanitary Flashcards

1
Q

Sanitary plumbing system

A

above ground

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2
Q

sanitary drainage system

A

underground

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3
Q

who has jurisdiction over sanitary plumbing in sg?

A

Ministry of the Environment & Water Resources (MEWR)

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4
Q

Parts of a sanitary plumbing system

A
  • discharge pipe
  • discharge stack
  • ventilating pipe
  • ventilating stack
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5
Q

Discharge pipe

A

pipe which conveys the discharges from a sanitary appliance or a floor trap

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6
Q

discharge stack

A

a main vertical discharge pipe

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7
Q

ventilating pipe

A

A pipe provided to limit the pressure fluctuations within any sanitary plumbing system

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8
Q

ventilating stack

A

A main vertical ventilating pipe

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9
Q

GO NOTES SEE FIG ONE

A
  • Water closet
  • long bath
  • ventilating pipe
  • ventilating stack
  • discharge pipe
  • discharge stack
  • floor trap
  • wash basin (have u-trap)
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10
Q

Trap Types

A
  • integral trap
  • P-trap
  • S-trap
  • Bottle trap (wash basin)
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11
Q

what are integral traps used for?

A
  • water closets
  • urinals
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12
Q

P & S traps used for

A
  • floor traps, bath tubs
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13
Q

bottle traps used for

A
  • wash basins
  • sinks
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14
Q

Types of Sanitary Plumbing System

A
  • single stack system
  • ventilated stack system
  • fully ventilated system
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15
Q

single stack system application

A

Where sanitary appliances are closely grouped around a discharge stack for buildings up to six storeys.

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16
Q

Ventilated Stack System

A

Where sanitary appliances are closely grouped around a discharge stack for buildings up to thirty storeys

17
Q

Fully Ventilated System

A

Where there are large numbers of sanitary appliances in range or where they have to be widely dispersed

18
Q

info about single stack system

A
  • No ventilating stack is required as the discharge stack is large enough to limit pressure fluctuations.
  • discharge stack has a uniform diameter of not less than 150 mm (except for conventional housing where 100 mm can be used) without offset throughout its entire length.
  • The maximum length of the discharge pipe is 2.5 m.
  • The maximum number of connections to the discharge pipe is two.
19
Q

Ventilated Stack System

A
  • Discharge pipes can be provided without the need for ventilating pipes.
  • Maximum length of the discharge pipe is 2.5 m.
  • Maximum number of connections to the discharge pipe is two.
  • Main discharge stack has a uniform diameter of not less than 150 mm throughout its entire length.
  • A separate discharge stack of minimum diameter 100 mm shall be provided to serve the 2nd and 3rd storeys.
  • Secondary discharge stack extended to serve as ventilating stack.
  • Ventilating stack should terminate as high as discharge stack or connected to discharge stack above the highest sanitary appliance.
  • Cross venting between secondary discharge stack and discharge stack is
    provided at the 1st storey.
  • Cross venting between the ventilating stack and discharge stack is
    provided on the multiple of 3 storeys.
20
Q

Fully Ventilated System

A
  • Separate discharge & ventilating stacks have to be provided and be extended to the atmosphere.
  • Individual traps/soil sanitary appliances connected directly to the discharge pipe or stack need to be provided with branch ventilating pipe which is connected to ventilating stack.
  • Discharge stack has a uniform diameter of not less than 100 mm throughout its entire length.
  • Traps connecting directly to discharge pipe shall be provided with a branch ventilating pipe of not less than 50 mm in diameter.
  • Ventilating pipe shall be constructed upwards individually and be connected to a main ventilating stack. Such connection shall be above the spill over level of the soil sanitary appliance or floor trap served by such ventilating pipe.
  • Top end of every ventilating stack shall either terminate as high as the discharge stack or connect into the discharge stack at a point not less than 150 mm above the spill over level of the topmost soil sanitary appliance or floor trap.
21
Q

What is inspection chambers

A
  • provide access to drains for inspection, testing, and clearing of blockages
22
Q

invert and soffit

A
  • Invert : Lowest point of internal surface of a pipe.
  • Soffit : Highest point of internal surface of a pipe.
23
Q

Design requirements of a sanitary drainage system

A
  • water tight
  • self-cleansing
24
Q

Water-tight why

A
  • if the system is not water-tight, the ground surrounding the drain would become polluted giving rise to unpleasant & unhealthy conditions
  • Rain water may also enter the system leading to overloading of the sewage treatment plant
25
Q

why need to be Self-cleansing

A
  • drain-lines will not become a breeding ground for harmful bacteria.
  • This produces a complex mixture of gases including hydrogen sulphide
    & methane which are harmful to maintenance workers.
26
Q

Provision of Inspection Chambers

A
  • Purpose
  • Location
  • Distance
27
Q

Location of inspection chambers

A
  • where blockages are likely to occur
  • such as junction, change of direction, change of drain-line
  • also change of pipe diameter
  • change of pipe material
28
Q

Grease Traps

A
  • required in eating establishments
  • to prevent discharge of oils, fats & grease directly into sewerage system
29
Q

why need to prevent discharge of oil etc into sewerage system

A
  • When grease is hot or contained in hot water, it’s in the form of an emulsion,
  • if allowed to flow into drains it will cool and adhere to the sides of pipes
30
Q

what is the principle of operation of grease trap?

A
  • congealing
  • involves cooling greases in large volume of water
  • so it solidifies & floats on water surface
  • grease will be removed from traps
30
Q

Sewage Ejector

A
  • collect sewerage then pump out to collector
31
Q

sump pump

A
  • wastewater enters sumps
  • liquid level rises to high level set point
  • float switch starts pump
  • liquid discharges to IC
  • float switch shut down pump

BSMM (6 decks)

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