Drainage & Sewer Flashcards
Convey sewage or other liquid wastes to a legal point of disposal
DRAINAGE SYSTEM
A comprehensive term, including all constructions for collection, transportation, pumping, treatment and final disposition of sewage
SEWERAGE OR SEWERAGE WORKS
All pipings are of threaded pipe, tubing, or using recessed drainage fittings
DURHAM SYSTEM
A pipe, which carries ground and surface waters, storm water or waste water into a bldg drainage system
DRAIN
shall discharge outside of the bldg or to gutter and not connected to soil and waste pipe systems
RAINWATER DRAINS
ideal, correct, positive slope for horizontal drainage piping
A. 1% or 10mm/m
B.2% or 20mm/m
C. 3% or 30mm/m
D. 4% or 40 mm/m
B.2% or 20mm/m
Slope between manholes
A. 1% or 10mm/m
B.2% or 20mm/m
C. 3% or 30mm/m
D. 4% or 40 mm/m
B.2% or 20 mm/m
allowed slope due to constraints such as excessive depth of proposed drainage line, structural and geological features of terrain existing adverse in arrangements of bldg
A. 1% or 10mm/m
B.2% or 20mm/m
C. 3% or 30mm/m
D. 4% or 40 mm/m
A. 1% or 10mm/m
allowable changes in direction of drainage flow
A. 90°
B..60°
C. 45°
D. All of the above
D. All of the above
allowable changes in direction
90°, 60°, 45°, 22 1/2°
22 1/2° = ???
1/16 bend
45° = ???
1/8 bend
60° = ???
1/6 bend
90° = ???
1/4 bend
other approved fittings of longer sweeps
combination wye + 1/8 bend and sanitary tee
NO galvanized wrought iron or galvanized steel pipe shall be kept at least _______above ground
152 mm
type of pipe materials used in high-rise bldg with discretion of MP/Designer and full consent of owner
ABS & PVC DWV
minimum depth of vitrified clay pipes
0.3 m
fittings in screwed pipe joints shall be of ______type
recessed drainage
threads of drainage fittings shall be tapped to allow _______ grade
2%
conveys discharge of the WC or UR (blackwater fecal matter)
SOIL PIPE
conveys only wastewater or liquid waste free of fecal matter (greywater)
WASTE PIPE
the drainpipe from the trap of a fixture to the junction of that drain with , any other drainpipe
FIXTURE DRAIN
drain connecting the set of fixtures to a trap or other permitted fixtures to a common trap
CONTINUOUS WASTE
vertical soil pipe conveying fecal matter and wastewater
SOIL STACK PIPE
A drain pipe extending laterally from a soil or waste stack or bldg drain
HORIZONTAL BRANCH
the single sloping drain from the base of a stack to its junction with the main bldg drain
PRIMARY BRANCH
any branch in the bldg drain other than the primary branch
SECONDARY BRANCH
Receives sewage or wastewater and below the normal grade of the gravity system
SUMP
a device installed in a drainage system to prevent reverse flow
BACKWATER VALVE
minimum dimension of tailpiece, continuous waste, or waste and overflow for sinks, dishwashers, laundry tubs, bathtubs, urinals (SDLBU)
38 mm O.D
minimum dimension of tailpiece, continuous waste, or waste overflow for lavatories, for drinking fountains (LDF)
32mm O.D
Clothes washers in groups of 3 or more shall be rated ______ each for the common horizontal and vertical waste pipe sizing
6 FU
WC shall be computed as ______ when determining septic tank size
6 FU
1 gpm= ????
0.063 L/s
DFU
DRAINAGE FIXTURE UNIT
How many fixture units for 0.47 L/s and less?
1 FU
How many fixture units for 0.50-0.95 L/s?
2 FU
How many fixture units for 1-1.89 L/s?
4 FU
How many fixture units for 1.95-3.15 L/s?
6 FU
distance of suds-producing fixtures in a horizontal drainage connected to a stack
2.4m
maximum WC or fixture unit traps for vertical pipe
4 WC or 6 FU traps
maximum WC or fixture unit traps for horizontal branch
3 WC or 6 FU traps
minimum size of individual vent
32mm or 1/2 diameter of drain
minimum size of any pump discharge from a sump serving a WC
50.8 mm diameter
How many FU allowed for each 0.063 L/s of flow or each GPM flow?
2 FU
Note: 2 FU: 1 GPM
C.O. location at horizontal drainage
upper terminal
C. O location at each run of piping
more than 15 m and at every 15m
C.O. may be omitted on horizontal drain line less than 1.5m except for _______
sinks or urinals
C.O. may be omitted on short horizontal drainage installed at ___________ from the vertical line
a slope of 72° or less
additional C.O. every ______ aggregate offset
135°
size of cleanouts needing 305mm clearance in front of the cleanout
51 mm or less
Size of cleanouts needing 450 mm clearance in front of the cleanout
larger than 51 mm
vertical clearance for cleanouts in underfloor piping
0.45m
horizontal clearance for cleanouts in under floor piping
0.75m
maximum distance of underfloor cleanout from an access door trap door or crawl hole
6.1m
_________ shall be installed where raised heads may cause to hazard to passing personnel or vehicles
countersunk cleanout plugs
a pipe or conduit for carrying sewage or wastewater
SEWER
receives sanitary sewage with or without pre-treated industrial wastes and without the admixture of rain or ground water
SANITARY SEWER
Starts from end of building drain and conveys it to a public sewer, private sewer, individual sewage disposal system then point of disposal
BUILDING SEWER
extending from house drain at a point 0.60m from the outside face of the foundation wall of a bldg
HOUSE SEWER
a bldg sewer which receives the discharge from more than one bldg drain and conveys it to a point of disposal
PRIVATE SEWER
common sewer directly controlled by public authority
PUBLIC SEWER
common sewer to which no other branch sewer is connected
LATERAL
that portion of underground system which cannot drain by gravity into the bldg sewer
BUILDING SUBDRAIN
an underground drainpipe that receives only *subsurface on seepage water and convey it to a sump for disposal by gravity flow or lift pump
SUBSOIL DRAIN
receives discharge from inside the walls of the bldg and conveys it to the bldg sewer beginning 0.60m outside the bldg wall
BUILDING DRAIN
receives the discharge from bldg and conveys it to the house sewer outside of the bldg
HOUSE DRAIN
opening in a sewer line for a man to gain access for maintenance
MANHOLE
if public sewer is more than __________ away from the bldg, the public sewer is considered not being available
61m
minimum bldg sewer size
150mm
recommended slope of bldg sewer
2% or 21 mm/m
allowable slope for 102 mm and 152.4 mm diameter
1% or 10.5 mm/m
allowable slope for 203 mm and larger
0.5% or 5.3 mm/m
distance of bldg sewer from outer face of any bldg foundation or wall
0.6m
depth of bldg sewer below the finish surface ground
0.3m
allowable reduction in distance when drainage piping is construction of materials approved for use within a bldg
7.6m
vertical clearance of water pipe to the top of sewer or drain line
0.3m
horizontal distance of water pipe from sewer on drain line
0.3m
vertical clearance of water pipes crossing sewer or drainage piping constructed of clay materials not approved for use within a bldg
0.3m
distance of water pipe joints away from sewer line
3m
No cleanout required at point of connection to bldg drain when bldg sewer does not exceed _________ in length
3m
All required bldg sewer cleanouts shall be _________ to grade
extended
maximum distance between manholes
91m
minimum distance of flexible compression joints outside of the manhole as connections for the inlet and outlet pipe
0.3m
does not directly connect with drainage system
INDIRECT WASTE PIPE
