TOPIC 7: Sanitary Drainage Systems Flashcards
TRUE OR FALSE: General Rules in designing the Sanitary system; The pipes should take the longest possible route to the house sewer or the terminating point of the Sanitary system.
FALSE: The pipes should take the shortest possible route to
the house sewer or the terminating point of the Sanitary system
TRUE OR FALSE: General Rules in designing the Sanitary system; Control components such as clean-outs, traps, and vents, should be located strategically so as to ensure efficient circulation
TRUE
Subsystems of the
Sanitary System:
Waste Collection System
Ventilation System
Essential Parts of the
Sanitary Drainage System
Waste Pipe
Vent Pipe
Trap
Stack
Branch
House/Building Drain
House/Building Sewer
Conveys only wastewater or liquid waste free of fecal matter
Waste Pipe
used for ensuring the circulation of air in a plumbing system and for relieving the negative pressure exerted on trap seals.
Vent Pipe
a fitting or device designed and constructed to provide, when properly vented, a liquid seal which prevents the backflow of foul air or methane gas without materially affecting the flow of sewage or wastewater through it.
Trap
the vertical main of a system of soil, waste or vent pipings extending through one or more stories and extended thru the roof.
Stack
any part of the piping system other than a main, riser or stack.
Branch
part of the lowest horizontal piping of a plumbing system which receives the
discharges from the soil, waste and other
drainage pipes inside of a building and conveys it to the house sewer outside of the building.
House/Building Drain
extends from the house drain at a point 0.60 meters from the outside face of the foundation wall of a building to the junction with the street sewer or to any point of discharge, and conveying the drainage of one building site.
House/Building Sewer
House/Building Sewer extends from the house drain at a point ______ from the outside face of the foundation wall of a building to the junction with the street sewer or to any point of discharge, and conveying the drainage of one building site.
0.60 meters
CHANGES IN DIRECTION OF SANITARY
DRAINAGE LINES
- Horizontal to Horizontal change in direction
- Vertical to Horizontal change in direction
- Horizontal to vertical change in direction
use 45° wye branches, combination wye – 1/8 bend branches, or other approved fittings of equivalent sweep
Horizontal to Horizontal change in direction
45° wye branches or other approved fittings of equivalent
sweep
Vertical to Horizontal change in direction
use 45° or 60° wye branches, combination wye -1/8 bend branches, sanitary tee or sanitary tapped tee branches, or other approved fittings of equivalent sweeps.
Horizontal to vertical change in direction
TRUE OR FALSE: No fitting having more than one inlet at the same level
shall be used (i.e., sanitary cross)
TRUE
TRUE OR FALSE: Double sanitary tees may be used when the barrel of the fitting is at least two pipe (3) sizes larger than the largest inlet, (pipe sizes recognized for this purpose are 51, 64, 76, 89, 102, 114, 127, & 152 mm dia.)
FALSE: Double sanitary tees may be used when the barrel of the fitting is at least two pipe (2) sizes larger than the largest inlet, (pipe sizes recognized for this purpose are 51, 64, 76, 89, 102, 114, 127, & 152 mm dia.)
TRUE OR FALSE: The size of waste pipes or soil pipes depend on the amount of waste it carries.
TRUE
A lavatory discharges _______ (7.5 gallons per min or 1 cu ft per min), which is equivalent to the Fixture Unit (F.U.)
0.47 liters/sec or 28.3 liters/min
A lavatory discharges 0.47 liters/sec or 28.3 liters/min (______), which is equivalent to the Fixture Unit (F.U.)
7.5 gallons per min or 1 cu ft per min
A lavatory discharges 0.47 liters/sec or 28.3 liters/min (7.5 gallons per min or 1 cu ft per min), which is equivalent to the ______
Fixture Unit (F.U.)
TRUE OR FALSE: The F.U. rating of plumbing fixtures is based on the color of the required trap.
FALSE: The F.U. rating of plumbing fixtures is based on the size of required trap.
Maximum Trap Loading: Pipe Size: F.U.
32 mm: 1
Item No.: 1
Maximum Trap Loading: Pipe Size: F.U.
38 mm: 3
Item No.: 2
Maximum Trap Loading: Pipe Size: F.U.
51 mm: 4
Item No.: 3
Maximum Trap Loading: Pipe Size: F.U.
76 mm: 6
Item No.: 4
Maximum Trap Loading: Pipe Size: F.U.
102 mm: 8
Item No.: 5
Capacity over 3.15 L/s shall
be determined by the
Administrative Authority.
For a continuous flow into a
drainage system, such as
from sump pump or ejector,
air-conditioning equipment or
similar devices, _____
fixture units shall be allowed
for every ____ of flow.
two (2); 0.063 L/s
1 gpm = ____ L/s
0.063
Discharge Capacity: Liters/Sec (GPM): F.U.
Up to 0.47 L/s (Up to 7.5 gpm) : 1
Item No.: 1
Discharge Capacity: Liters/Sec (GPM): F.U.
0.50 to 0.95 (8 to 15 gpm) : 2
Item No.: 2
Discharge Capacity: Liters/Sec (GPM): F.U.
1 to 1.89 (16 to 30 gpm) : 4
Item No.: 3
Discharge Capacity: Liters/Sec (GPM): F.U.
1.95 to 3.15 (31 to 50 gpm) : 6
Item No.: 4
Minimum slope or pitch of horizontal drainage pipe – ____.
2% or 20mm/m (¼” per foot)
Where it is impracticable due to depth of street sewer, adverse structural features and irregular building plans, pipes _____ diameter or larger may have a slope of not less than _____ approved by the Administrative Authority
102 mm ; 1% or 10mm/m (1/8” per foot),
Types of Permissible Traps:
Common P-Trap
Deep Deal P-Trap
Stand Trap
Running Trap
Drum Trap
Used for lavatories, kitchen sinks,
laundry tubs, & urinals
Common P-Trap
Materials commonly used for the
P-trap: nickel, chrome plated brass,
Galvanized malleable copper, & PVC.
Common P-Trap
Water seal is about twice the size of
The common P-trap
Deep Deal P-Trap
Used for fixtures such as slop sinks
that are usually built low in the
ground, leaving very little space for a
foundation & a trap
Stand Trap
