39 Questions
What is the minimum depth requirement for the water seal in a grease trap?
51 mm
What type of fixtures are grease traps used for?
Fixtures with potential grease introduction into drainage
What is the principle behind grease separation in Earth Cooled Grease Traps?
Grease rises to the surface of waste
What is a characteristic of House Traps?
Situated inside the foundation wall
What does a Garage Trap do?
Collects all wastes at the lowest point of the garage
Which type of drain tiles are used to prevent groundwater seepage?
Hollow tiles
How many fixtures are connected to a grease trap with a required flow rate of 132 L/min?
3
What is the primary purpose of a Mechanical Grease Trap?
Separating grease from water waste
What is the minimum liquid depth required in the first compartment of a septic tank?
0.6 m
How many compartments are required in a private sewage disposal system?
Two
What is the minimum length required for the secondary compartment in septic tanks over 6 cum capacity?
1.5 m
How many manholes are required in a private sewage disposal system?
Two
What is the minimum dimension required for the manholes in a private sewage disposal system?
508 mm
What is the recommended slope at the bottom of the digestion chamber in a private sewage disposal system?
1:10
What is the minimum liquid capacity required for the first compartment of a septic tank?
$2 , \text{cum}$
What is the minimum width required for the first compartment of a septic tank?
$0.9 , \text{m}$
What is the purpose of the vent pipe in a plumbing system?
To relieve negative pressure on trap seals
Which type of vent is known as the 'backbone' of the entire sanitary system?
Main Vent
Where does the Main Soil & Waste Vent typically end?
Continues to the roof
What does an Individual Vent or Back Vent connect with?
The vent system above the fixture served
What is a Unit, Common, or Dual Vent in a plumbing system?
An arrangement where one vent pipe serves two traps
What is the purpose of a Relief Vent in a drainage system?
To provide additional circulation of air between drainage and vent systems
What does the Main Vent in a venting system primarily support?
'Main Soil & Waste Vent'
Where would you typically find an open-air termination for an Individual Vent?
'Terminates in the open air'
How far below the water surface should the outlet extend?
304.8 mm
What is the minimum height the side walls should extend above the liquid depth?
228.6 mm
What is the minimum distance the septic tank should be located from the water distribution system?
15 meters
What is the required diameter of the vent?
Equal to the house sewer diameter
Where should the invert of the inlet pipe be in relation to the invert of the outlet pipe?
At a lower level
Which type of baffles are prohibited for use in septic tanks?
Wooden baffles
What determines the capacity of septic tanks?
of plumbing fixtures in a building
Where should the yoke vent connection be placed according to the text?
Below the fixture branch serving the floor
What is the direct effect of Minus & Plus Pressure inside the system, as per the text?
Siphonage and back pressure
What is an Indirect Waste Pipe according to the text?
A pipe that discharges into a plumbing fixture connected to the drainage system
In which type of establishments are grease traps required according to the text?
Restaurants and cafes
What is the maximum flow rate above which a grease trap is not required, as mentioned in the text?
3.4 L/s (54.26 gpm)
Which factor can blow away the trap seal according to the text?
Strong winds
What is the function of a wye branch at the soil stack according to the text?
To place the yoke vent connection below the floor level
What is a Wet-Vented System according to the text?
A system where water and air combine in a single pipe
Test your knowledge on the ventilation portion of drainage pipe installation, vent pipes, main types of vents, and their functions in plumbing systems.
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